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871W Cannot Get DHCP Address - Cable Modem

I am having difficulties getting my Cisco 871W SOHO router to get a DHCP address over its FE4 interface. If I statically assign the IP that my previous SOHO router had received through DHCP, I get Internet connectivity with no problem. However, an address is never assigned via DHCP.

Are there any tricks to getting a Cisco device to successfully get a DHCP address? I am sure the commands are correct, since I have used SDM to set the interfaces.

Thanks

Reply to
tom
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interface FastEthernet 0 description interface connected to cable modem ip address dhcp client-id FastEthernet 0

! if the above does not work the ISP may require the use of the SOHO router MAC address

interface FastEthernet 0/0

! mac-address format is 12 hex digits hhhh.hhh.hhhh

! mac-address

mac-address hhhh.hhhh.hhhh

Reply to
Merv

BTW

What is the make and model of the SOHO router

Who is the ISP?

Reply to
Merv

Um, the SOHO router is the Cisco 871W that I referenced earlier. If you're talking about the one that I am replacing, it's a DLink or somesuch.

The ISP is Cox. I've talked with them, and they tell me that they don't care about anything on my end of the cable modem - no need to reset MACs.

Thanks

Reply to
tom
  1. If DHCP problem is still persisting, then I would suggest the following steps.

  1. Enable internal logging on router

conf t logging buffer 10000 debug no logging console exit

wri mem

  1. Turn on debugging for DHCP requests to ISP

debug dhcp detail

  1. Power cycle the modem and the 871W, in that order, waiting until the

cable modem's LEDs indicate that it has reloaded and is functioning.

  1. Capture the output of the following command and post here

show log

Reply to
Merv

Thanks for your help with this - I am at a total loss.. Here is the DHCP debug log:

Log Buffer (10000 bytes):

9 PCTime: %DOT11-7-AUTH_FAILED: Station 000b.7d0b.0c60 Authentication failed 000202: *Feb 28 17:18:36.863 PCTime: %LINK-3-UPDOWN: Interface FastEthernet4, changed state to up 000203: *Feb 28 17:18:37.863 PCTime: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet4, changed state to up 000204: *Feb 28 17:18:37.979 PCTime: DHCP: SDiscover attempt # 2 for entry: 000205: *Feb 28 17:18:37.979 PCTime: Temp IP addr: 0.0.0.0 for peer on Interface: FastEthernet4 000206: *Feb 28 17:18:37.979 PCTime: Temp sub net mask: 0.0.0.0 000207: *Feb 28 17:18:37.979 PCTime: DHCP Lease server: 0.0.0.0, state: 1 Selecting 000208: *Feb 28 17:18:37.979 PCTime: DHCP transaction id: 172F 000209: *Feb 28 17:18:37.979 PCTime: Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs 000210: *Feb 28 17:18:37.979 PCTime: Next timer fires after: 00:00:04 000211: *Feb 28 17:18:37.979 PCTime: Retry count: 2 Client-ID: 0015.c653.9062 000212: *Feb 28 17:18:37.979 PCTime: Client-ID hex dump: 0015C6539062 000213: *Feb 28 17:18:37.979 PCTime: Hostname: cisco871 000214: *Feb 28 17:18:37.979 PCTime: DHCP: SDiscover: sending 277 byte length DHCP packet --More--  000215: *Feb 28 17:18:37.979 PCTime: DHCP: SDiscover 277 bytes 000216: *Feb 28 17:18:37.979 PCTime: B'cast on FastEthernet4 interface from 0.0.0.0 000217: *Feb 28 17:18:41.979 PCTime: DHCP: SDiscover attempt # 3 for entry: 000218: *Feb 28 17:18:41.979 PCTime: Temp IP addr: 0.0.0.0 for peer on Interface: FastEthernet4 000219: *Feb 28 17:18:41.979 PCTime: Temp sub net mask: 0.0.0.0 000220: *Feb 28 17:18:41.979 PCTime: DHCP Lease server: 0.0.0.0, state: 1 Selecting 000221: *Feb 28 17:18:41.979 PCTime: DHCP transaction id: 172F 000222: *Feb 28 17:18:41.979 PCTime: Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs 000223: *Feb 28 17:18:41.979 PCTime: Next timer fires after: 00:00:04 000224: *Feb 28 17:18:41.979 PCTime: Retry count: 3 Client-ID: 0015.c653.9062 000225: *Feb 28 17:18:41.979 PCTime: Client-ID hex dump: 0015C6539062 000226: *Feb 28 17:18:41.979 PCTime: Hostname: cisco871 000227: *Feb 28 17:18:41.979 PCTime: DHCP: SDiscover: sending 277 byte length DHCP packet 000228: *Feb 28 17:18:41.979 PCTime: DHCP: SDiscover 277 bytes 000229: *Feb 28 17:18:41.979 PCTime: B'cast on FastEthernet4 interface from 0.0.0.0 000230: *Feb 28 17:18:45.979 PCTime: DHCP: QScan: Timed out Selecting state%Unknown DHCP problem.. No allocation possible --More--  000231: *Feb 28 17:18:55.359 PCTime: DHCP: Waiting for 5 seconds on interface FastEthernet4 000232: *Feb 28 17:19:00.359 PCTime: DHCP: Try 2 to acquire address for FastEthernet4 000233: *Feb 28 17:19:00.359 PCTime: DHCP: allocate request 000234: *Feb 28 17:19:00.359 PCTime: DHCP: zapping entry in DHC_PURGING state for Fa4 000235: *Feb 28 17:19:00.359 PCTime: DHCP: deleting entry 829CB158 0=2E0.0.0 from list 000236: *Feb 28 17:19:00.363 PCTime: Temp IP addr: 0.0.0.0 for peer on Interface: FastEthernet4 000237: *Feb 28 17:19:00.363 PCTime: Temp sub net mask: 0.0.0.0 000238: *Feb 28 17:19:00.363 PCTime: DHCP Lease server: 0.0.0.0, state: 9 Purging 000239: *Feb 28 17:19:00.363 PCTime: DHCP transaction id: 172F 000240: *Feb 28 17:19:00.363 PCTime: Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs 000241: *Feb 28 17:19:00.363 PCTime: Next timer fires after: 00:00:26 000242: *Feb 28 17:19:00.363 PCTime: Retry count: 0 Client-ID: 0015.c653.9062 000243: *Feb 28 17:19:00.363 PCTime: Client-ID hex dump: 0015C6539062 000244: *Feb 28 17:19:00.363 PCTime: Hostname: cisco871 000245: *Feb 28 17:19:00.363 PCTime: DHCP: new entry. add to queue, interface FastEthernet4 --More--  000246: *Feb 28 17:19:00.363 PCTime: DHCP: SDiscover attempt # 1 for entry: 000247: *Feb 28 17:19:00.363 PCTime: Temp IP addr: 0.0.0.0 for peer on Interface: FastEthernet4 000248: *Feb 28 17:19:00.363 PCTime: Temp sub net mask: 0.0.0.0 000249: *Feb 28 17:19:00.363 PCTime: DHCP Lease server: 0.0.0.0, state: 1 Selecting 000250: *Feb 28 17:19:00.363 PCTime: DHCP transaction id: 1730 000251: *Feb 28 17:19:00.363 PCTime: Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs 000252: *Feb 28 17:19:00.363 PCTime: Next timer fires after: 00:00:04 000253: *Feb 28 17:19:00.363 PCTime: Retry count: 1 Client-ID: 0015.c653.9062 000254: *Feb 28 17:19:00.363 PCTime: Client-ID hex dump: 0015C6539062 000255: *Feb 28 17:19:00.363 PCTime: Hostname: cisco871 000256: *Feb 28 17:19:00.363 PCTime: DHCP: SDiscover: sending 277 byte length DHCP packet 000257: *Feb 28 17:19:00.363 PCTime: DHCP: SDiscover 277 bytes 000258: *Feb 28 17:19:00.363 PCTime: B'cast on FastEthernet4 interface from 0.0.0.0 000259: *Feb 28 17:19:03.979 PCTime: DHCP: SDiscover attempt # 2 for entry: 000260: *Feb 28 17:19:03.979 PCTime: Temp IP addr: 0.0.0.0 for peer on Interface: FastEthernet4 000261: *Feb 28 17:19:03.979 PCTime: Temp sub net mask: 0.0.0.0 --More--  000262: *Feb 28 17:19:03.979 PCTime: DHCP Lease server: 0.0.0.0, state: 1 Selecting 000263: *Feb 28 17:19:03.979 PCTime: DHCP transaction id: 1730 000264: *Feb 28 17:19:03.979 PCTime: Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs 000265: *Feb 28 17:19:03.979 PCTime: Next timer fires after: 00:00:04 000266: *Feb 28 17:19:03.979 PCTime: Retry count: 2 Client-ID: 0015.c653.9062 000267: *Feb 28 17:19:03.979 PCTime: Client-ID hex dump: 0015C6539062 000268: *Feb 28 17:19:03.979 PCTime: Hostname: cisco871 000269: *Feb 28 17:19:03.979 PCTime: DHCP: SDiscover: sending 277 byte length DHCP packet 000270: *Feb 28 17:19:03.979 PCTime: DHCP: SDiscover 277 bytes 000271: *Feb 28 17:19:03.979 PCTime: B'cast on FastEthernet4 interface from 0.0.0.0 000272: *Feb 28 17:19:04.799 PCTime: %DOT11-7-AUTH_FAILED: Station 000b.7d0b.0c60 Authentication failed 000273: *Feb 28 17:19:07.715 PCTime: %DOT11-7-AUTH_FAILED: Station 000b.7d0b.0c60 Authentication failed 000274: *Feb 28 17:19:07.979 PCTime: DHCP: SDiscover attempt # 3 for entry: 000275: *Feb 28 17:19:07.979 PCTime: Temp IP addr: 0.0.0.0 for peer on Interface: FastEthernet4 000276: *Feb 28 17:19:07.979 PCTime: Temp sub net mask: 0.0.0.0 --More--  000277: *Feb 28 17:19:07.979 PCTime: DHCP Lease server: 0.0.0.0, state: 1 Selecting 000278: *Feb 28 17:19:07.979 PCTime: DHCP transaction id: 1730 000279: *Feb 28 17:19:07.979 PCTime: Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs 000280: *Feb 28 17:19:07.979 PCTime: Next timer fires after: 00:00:04 000281: *Feb 28 17:19:07.979 PCTime: Retry count: 3 Client-ID: 0015.c653.9062 000282: *Feb 28 17:19:07.979 PCTime: Client-ID hex dump: 0015C6539062 000283: *Feb 28 17:19:07.979 PCTime: Hostname: cisco871 000284: *Feb 28 17:19:07.979 PCTime: DHCP: SDiscover: sending 277 byte length DHCP packet 000285: *Feb 28 17:19:07.979 PCTime: DHCP: SDiscover 277 bytes 000286: *Feb 28 17:19:07.979 PCTime: B'cast on FastEthernet4 interface from 0.0.0.0 000287: *Feb 28 17:19:10.723 PCTime: %DOT11-7-AUTH_FAILED: Station 000b.7d0b.0c60 Authentication failed 000288: *Feb 28 17:19:11.979 PCTime: DHCP: QScan: Timed out Selecting state 000289: *Feb 28 17:19:18.135 PCTime: DHCP: Release IPL called for interface FastEthernet4 in state 9 000290: *Feb 28 17:19:18.135 PCTime: RAC: DHCP stopped on interface FastEthernet4 000291: *Feb 28 17:19:20.135 PCTime: %LINK-5-CHANGED: Interface FastEthernet4, changed state to administratively down --More--  000292: *Feb 28 17:19:21.135 PCTime: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet4, changed state to down 000293: *Feb 28 17:19:22.791 PCTime: DHCP: DHCP client process started: 10 000294: *Feb 28 17:19:22.791 PCTime: RAC: Starting DHCP discover on FastEthernet4 000295: *Feb 28 17:19:22.791 PCTime: DHCP: Try 1 to acquire address for FastEthernet4 000296: *Feb 28 17:19:22.795 PCTime: DHCP: allocate request 000297: *Feb 28 17:19:22.795 PCTime: DHCP: zapping entry in DHC_PURGING state for Fa4 000298: *Feb 28 17:19:22.795 PCTime: DHCP: deleting entry 82053D6C 0=2E0.0.0 from list 000299: *Feb 28 17:19:22.795 PCTime: Temp IP addr: 0.0.0.0 for peer on Interface: FastEthernet4 000300: *Feb 28 17:19:22.795 PCTime: Temp sub net mask: 0.0.0.0 000301: *Feb 28 17:19:22.795 PCTime: DHCP Lease server: 0.0.0.0, state: 9 Purging 000302: *Feb 28 17:19:22.795 PCTime: DHCP transaction id: 1730 000303: *Feb 28 17:19:22.795 PCTime: Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs 000304: *Feb 28 17:19:22.795 PCTime: Next timer fires after: 00:00:21 000305: *Feb 28 17:19:22.795 PCTime: Retry count: 0 Client-ID: 0015.c653.9062 --More--  000306: *Feb 28 17:19:22.795 PCTime: Client-ID hex dump: 0015C6539062 000307: *Feb 28 17:19:22.795 PCTime: Hostname: cisco871 000308: *Feb 28 17:19:22.795 PCTime: DHCP: new entry. add to queue, interface FastEthernet4 000309: *Feb 28 17:19:22.795 PCTime: DHCP: SDiscover attempt # 1 for entry: 000310: *Feb 28 17:19:22.799 PCTime: Temp IP addr: 0.0.0.0 for peer on Interface: FastEthernet4 000311: *Feb 28 17:19:22.799 PCTime: Temp sub net mask: 0.0.0.0 000312: *Feb 28 17:19:22.799 PCTime: DHCP Lease server: 0.0.0.0, state: 1 Selecting 000313: *Feb 28 17:19:22.799 PCTime: DHCP transaction id: 1300 000314: *Feb 28 17:19:22.799 PCTime: Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs 000315: *Feb 28 17:19:22.799 PCTime: Next timer fires after: 00:00:04 000316: *Feb 28 17:19:22.799 PCTime: Retry count: 1 Client-ID: 0015.c653.9062 000317: *Feb 28 17:19:22.799 PCTime: Client-ID hex dump: 0015C6539062 000318: *Feb 28 17:19:22.799 PCTime: Hostname: cisco871 000319: *Feb 28 17:19:22.799 PCTime: DHCP: SDiscover: sending 277 byte length DHCP packet 000320: *Feb 28 17:19:22.799 PCTime: DHCP: SDiscover 277 bytes
Reply to
tom

The DHCP debug showsthat the 871W is sending DHCP Discovery messages and not receiving any response.

What is the MAC address for the Dlink router that you used previously ?

What is the model number of the Dlink router

Try conf t interface FastEthernet 0/0

! mac-address format is 12 hex digits hhhh.hhh.hhhh

! mac-address

mac-address hhhh.hhhh.hhhh end wri mem

disconnect cable to fast 0/0 and then reconnect

Reply to
Merv
  1. Please post the output of "show version"

  1. Post your current config

  2. Capture configuring and using IP address you used previously on the Fastethernet 4 (outside) interface

enable conf t int fa 4 ip address x.x.x.x m.m.m.m exit

wri mem

clear counter fa 4

ping y.y.y.y ! where y.y.y.y is the COX upstream router

sh ip arp y.y.y.y

sh int fa 4

Reply to
Merv

For an overview of the DHCP packets that should be exchanged between the Cisco 871W and the COX DHCP server, see web.syr.edu/~djmolta/ist452/ch_08.ppt

In the debug trace once DHCP is working proeprly you should see the following packet exchange :

  1. DHCP Discovery --->
  2. DHCP Offer
  3. DHCP Ack
Reply to
Merv

When you got your COX service did you have to register your PC or your DLINK device with COX by sighing on to their web site ?

Reply to
Merv

On your DLINK router did you use the "Clone MAC" button?

see

formatting link

Reply to
Merv

Merv wrote:

The problem I see with any question of the old router's MAC being the issue, is that I am now online by statically assigning the IP address received via DHCP to the DLink, on the Cisco. In fact, the DLink is now dead, so the only way I am able to get online is to statically assign that IP to the Cisco. Kinda rules the MAC address out, no?

Output of commands:

show ru cisco871#show running-config Building configuration...

Current configuration : 4946 bytes ! version 12.3 no service pad service tcp-keepalives-in service tcp-keepalives-out service timestamps debug datetime msec localtime show-timezone service timestamps log datetime msec localtime show-timezone service password-encryption service sequence-numbers ! hostname cisco871 ! boot-start-marker boot-end-marker ! logging buffered 10000 debugging no logging console enable secret 5 $1$NeSs$DSY2bKyVqOJN1L79VeRVc0 ! username admin privilege 15 secret 5 $1$sw3n$xgQc7G3SBHFK5vtmYTTSY0 clock timezone PCTime -8 --More--  clock summer-time PCTime date Apr 6

2003 2:00 Oct 26 2003 2:00 no aaa new-model ip subnet-zero ip cef ip dhcp excluded-address 192.168.0.1 192.168.0.49 ! ip dhcp pool sdm-pool1 import all network 192.168.0.0 255.255.255.0 dns-server 4.2.2.2 default-router 192.168.0.3 ! ! ip inspect name DEFAULT100 cuseeme ip inspect name DEFAULT100 ftp ip inspect name DEFAULT100 h323 ip inspect name DEFAULT100 icmp ip inspect name DEFAULT100 netshow ip inspect name DEFAULT100 rcmd ip inspect name DEFAULT100 realaudio ip inspect name DEFAULT100 rtsp ip inspect name DEFAULT100 esmtp ip inspect name DEFAULT100 sqlnet --More--  ip inspect name DEFAULT100 streamworks ip inspect name DEFAULT100 tftp ip inspect name DEFAULT100 tcp ip inspect name DEFAULT100 udp ip inspect name DEFAULT100 vdolive ip tcp synwait-time 10 ip domain name yourdomain.com ip name-server 4.2.2.2 ip ssh time-out 60 ip ssh authentication-retries 2 no ftp-server write-enable ! ! ! ! ! bridge irb ! ! interface FastEthernet0 no ip address no cdp enable ! --More--  interface FastEthernet1 no ip address no cdp enable ! interface FastEthernet2 no ip address no cdp enable ! interface FastEthernet3 no ip address no cdp enable ! interface FastEthernet4 description $FW_OUTSIDE$$ETH-WAN$$ES_WAN$ ip address 68.6.120.REMOVED 255.255.252.0 ip access-group 101 in ip inspect DEFAULT100 out ip nat outside ip virtual-reassembly ip route-cache flow duplex auto speed auto no cdp enable --More--  ! interface Dot11Radio0 no ip address ! encryption key 1 size 40bit 7 XXXXXXXXXX transmit-key encryption mode wep mandatory ! ssid donotconnect authentication open guest-mode ! speed basic-1.0 basic-2.0 basic-5.5 6.0 9.0 basic-11.0 12.0 18.0 24.0 36.0 48.0 54.0 station-role root no dot11 extension aironet no cdp enable bridge-group 1 bridge-group 1 subscriber-loop-control bridge-group 1 spanning-disabled bridge-group 1 block-unknown-source no bridge-group 1 source-learning no bridge-group 1 unicast-flooding ! --More--  interface Vlan1 description $ETH-SW-LAUNCH$$INTF-INFO-HWIC 4ESW$$FW_INSIDE$ no ip address bridge-group 1 ! interface BVI1 description $ES_LAN$$FW_INSIDE$ ip address 192.168.0.3 255.255.255.0 ip access-group 100 in ip nat inside ip virtual-reassembly ip tcp adjust-mss 1452 ! ip classless ip route 0.0.0.0 0.0.0.0 68.6.120.1 ! ip http server ip http authentication local ip http secure-server ip http timeout-policy idle 5 life 86400 requests 10000 ip nat inside source list 1 interface FastEthernet4 overload ip nat inside source static tcp 192.168.0.99 XXXX interface FastEthernet4 XXXX ! --More--  logging trap debugging access-list 1 remark INSIDE_IF=3DBVI1 access-list 1 remark SDM_ACL Category=3D2 access-list 1 permit 192.168.0.0 0.0.0.255 access-list 100 remark auto-generated by Cisco SDM Express firewall configuration access-list 100 remark SDM_ACL Category=3D1 access-list 100 deny ip host 255.255.255.255 any access-list 100 deny ip 127.0.0.0 0.255.255.255 any access-list 100 permit ip any any access-list 101 remark auto-generated by Cisco SDM Express firewall configuration access-list 101 remark SDM_ACL Category=3D1 access-list 101 permit tcp any host 68.6.120.REMOVED eq www access-list 101 permit udp host 4.2.2.2 eq domain any access-list 101 deny ip 192.168.0.0 0.0.0.255 any access-list 101 permit icmp any any echo-reply access-list 101 permit icmp any any time-exceeded access-list 101 permit icmp any any unreachable access-list 101 deny ip 10.0.0.0 0.255.255.255 any access-list 101 deny ip 172.16.0.0 0.15.255.255 any access-list 101 deny ip 192.168.0.0 0.0.255.255 any access-list 101 deny ip 127.0.0.0 0.255.255.255 any --More--  access-list 101 deny ip host 255.255.255.255 any access-list 101 deny ip any any access-list 701 permit 000e.3b04.a26c 0000.0000.0000 access-list 701 permit 000b.7d0b.0c60 0000.0000.0000 access-list 701 deny 0000.0000.0000 ffff.ffff.ffff no cdp run ! control-plane ! bridge 1 protocol ieee bridge 1 route ip banner login ^CAuthorized access only! Disconnect IMMEDIATELY if you are not an authorized user!^C ! line con 0 login local no modem enable transport preferred all transport output telnet line aux 0 login local transport preferred all transport output telnet --More--  line vty 0 4 privilege level 15 login local transport preferred all transport input telnet ssh transport output all ! scheduler max-task-time 5000 scheduler allocate 4000 1000 scheduler interval 500 end

cisco871#  show version Cisco IOS Software, C870 Software (C870-ADVSECURITYK9-M), Version

12.3(8)YI2, RELEASE SOFTWARE (fc1) Synched to technology version 12.3(10.3)T2

ROM: System Bootstrap, Version 12.3(8r)YI, RELEASE SOFTWARE ROM: Cisco IOS Software, C870 Software (C870-ADVSECURITYK9-M), Version

12.3(8)YI2, RELEASE SOFTWARE (fc1)

cisco871 uptime is 12 hours, 23 minutes System returned to ROM by power-on System image file is "flash:c870-advsecurityk9-mz.123-8.YI2.bin"

Cisco 871W (MPC8272) processor (revision 0x100) with 118784K/12288K bytes of memory. MPC8272 CPU Rev: Part Number 0xC, Mask Number 0x10

5 FastEthernet interfaces 1 802.11 Radio 128K bytes of non-volatile configuration memory. 24576K bytes of processor board System flash (Intel Strataflash)

Configuration register is 0x2102

cisco871#ping 68.6.120.1

Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 68.6.120.1, timeout is 2 seconds: !=2E!.! Success rate is 60 percent (3/5), round-trip min/avg/max =3D 12/12/12 ms cisco871#

Reply to
tom

No, I had never used this feature.

Nope

I think I should try using a local DHCP server to see if the device gets an IP from it. However, even if it does, I still won't know how to proceed with the problem, since the ISP has already told me that they don't reset anything on their end when a new router is in place on my end . . .

Reply to
tom

Well, it won't get an IP using DHCP from a local server either . . .

------------

sow  how log Syslog logging: enabled (0 messages dropped, 2 messages rate-limited, 0 flushes, 0 overruns, xml disabled, filtering disabled) Console logging: disabled Monitor logging: level debugging, 0 messages logged, xml disabled, filtering disabled Buffer logging: level debugging, 1884 messages logged, xml disabled, filtering disabled Logging Exception size (4096 bytes) Count and timestamp logging messages: disabled

No active filter modules.

Trap logging: level debugging, 1014 message lines logged --More--   Log Buffer (10000 bytes): 393036322D466134

000879: *Mar 1 06:47:55.792 PCTime: Hostname: cisco871 000880: *Mar 1 06:47:55.792 PCTime: DHCP: SDiscover: sending 295 byte length DHCP packet 000881: *Mar 1 06:47:55.792 PCTime: DHCP: SDiscover 295 bytes 000882: *Mar 1 06:47:55.792 PCTime: B'cast on FastEthernet4 interface from 0.0.0.0 000883: *Mar 1 06:47:59.932 PCTime: DHCP: QScan: Timed out Selecting state%Unknown DHCP problem.. No allocation possible 000884: *Mar 1 06:48:09.224 PCTime: DHCP: Waiting for 10 seconds on interface FastEthernet4 000885: *Mar 1 06:48:19.224 PCTime: DHCP: Try 3 to acquire address for FastEthernet4 000886: *Mar 1 06:48:19.224 PCTime: DHCP: allocate request 000887: *Mar 1 06:48:19.224 PCTime: DHCP: zapping entry in DHC_PURGING state for Fa4 000888: *Mar 1 06:48:19.224 PCTime: DHCP: deleting entry 8238A634 0=2E0.0.0 from list 000889: *Mar 1 06:48:19.228 PCTime: Temp IP addr: 0.0.0.0 for peer on Interface: FastEthernet4 000890: *Mar 1 06:48:19.228 PCTime: Temp sub net mask: 0.0.0.0 --More--  000891: *Mar 1 06:48:19.228 PCTime: DHCP Lease server: 0.0.0.0, state: 9 Purging 000892: *Mar 1 06:48:19.228 PCTime: DHCP transaction id: 1F68 000893: *Mar 1 06:48:19.228 PCTime: Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs 000894: *Mar 1 06:48:19.228 PCTime: Next timer fires after: 00:00:21 000895: *Mar 1 06:48:19.228 PCTime: Retry count: 0 Client-ID: cisco-0015.c653.9062-Fa4 000896: *Mar 1 06:48:19.228 PCTime: Client-ID hex dump: 636973636F2D303031352E633635332E 000897: *Mar 1 06:48:19.228 PCTime: 393036322D466134 000898: *Mar 1 06:48:19.228 PCTime: Hostname: cisco871 000899: *Mar 1 06:48:19.228 PCTime: DHCP: new entry. add to queue, interface FastEthernet4 000900: *Mar 1 06:48:19.228 PCTime: DHCP: SDiscover attempt # 1 for entry: 000901: *Mar 1 06:48:19.228 PCTime: Temp IP addr: 0.0.0.0 for peer on Interface: FastEthernet4 000902: *Mar 1 06:48:19.228 PCTime: Temp sub net mask: 0.0.0.0 000903: *Mar 1 06:48:19.228 PCTime: DHCP Lease server: 0.0.0.0, state: 1 Selecting 000904: *Mar 1 06:48:19.228 PCTime: DHCP transaction id: 1F69 000905: *Mar 1 06:48:19.228 PCTime: Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs --More--  000906: *Mar 1 06:48:19.228 PCTime: Next timer fires after: 00:00:04 000907: *Mar 1 06:48:19.228 PCTime: Retry count: 1 Client-ID: cisco-0015.c653.9062-Fa4 000908: *Mar 1 06:48:19.228 PCTime: Client-ID hex dump: 636973636F2D303031352E633635332E 000909: *Mar 1 06:48:19.228 PCTime: 393036322D466134 000910: *Mar 1 06:48:19.232 PCTime: Hostname: cisco871 000911: *Mar 1 06:48:19.232 PCTime: DHCP: SDiscover: sending 295 byte length DHCP packet 000912: *Mar 1 06:48:19.232 PCTime: DHCP: SDiscover 295 bytes 000913: *Mar 1 06:48:19.232 PCTime: B'cast on FastEthernet4 interface from 0.0.0.0 000914: *Mar 1 06:48:22.932 PCTime: DHCP: SDiscover attempt # 2 for entry: 000915: *Mar 1 06:48:22.932 PCTime: Temp IP addr: 0.0.0.0 for peer on Interface: FastEthernet4 000916: *Mar 1 06:48:22.932 PCTime: Temp sub net mask: 0.0.0.0 000917: *Mar 1 06:48:22.932 PCTime: DHCP Lease server: 0.0.0.0, state: 1 Selecting 000918: *Mar 1 06:48:22.932 PCTime: DHCP transaction id: 1F69 000919: *Mar 1 06:48:22.932 PCTime: Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs 000920: *Mar 1 06:48:22.932 PCTime: Next timer fires after: 00:00:04 000921: *Mar 1 06:48:22.932 PCTime: Retry count: 2 Client-ID: cisco-0015.c653.9062-Fa4 --More--  000922: *Mar 1 06:48:22.932 PCTime: Client-ID hex dump: 636973636F2D303031352E633635332E 000923: *Mar 1 06:48:22.932 PCTime: 393036322D466134 000924: *Mar 1 06:48:22.932 PCTime: Hostname: cisco871 000925: *Mar 1 06:48:22.932 PCTime: DHCP: SDiscover: sending 295 byte length DHCP packet 000926: *Mar 1 06:48:22.932 PCTime: DHCP: SDiscover 295 bytes 000927: *Mar 1 06:48:22.932 PCTime: B'cast on FastEthernet4 interface from 0.0.0.0 000928: *Mar 1 06:48:26.932 PCTime: DHCP: SDiscover attempt # 3 for entry: 000929: *Mar 1 06:48:26.932 PCTime: Temp IP addr: 0.0.0.0 for peer on Interface: FastEthernet4 000930: *Mar 1 06:48:26.932 PCTime: Temp sub net mask: 0.0.0.0 000931: *Mar 1 06:48:26.932 PCTime: DHCP Lease server: 0.0.0.0, state: 1 Selecting 000932: *Mar 1 06:48:26.932 PCTime: DHCP transaction id: 1F69 000933: *Mar 1 06:48:26.932 PCTime: Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs 000934: *Mar 1 06:48:26.932 PCTime: Next timer fires after: 00:00:04 000935: *Mar 1 06:48:26.932 PCTime: Retry count: 3 Client-ID: cisco-0015.c653.9062-Fa4 000936: *Mar 1 06:48:26.932 PCTime: Client-ID hex dump: 636973636F2D303031352E633635332E --More--  000937: *Mar 1 06:48:26.932 PCTime: 393036322D466134 000938: *Mar 1 06:48:26.932 PCTime: Hostname: cisco871 000939: *Mar 1 06:48:26.932 PCTime: DHCP: SDiscover: sending 295 byte length DHCP packet 000940: *Mar 1 06:48:26.932 PCTime: DHCP: SDiscover 295 bytes 000941: *Mar 1 06:48:26.932 PCTime: B'cast on FastEthernet4 interface from 0.0.0.0 000942: *Mar 1 06:48:30.932 PCTime: DHCP: QScan: Timed out Selecting state%Unknown DHCP problem.. No allocation possible 000943: *Mar 1 06:48:39.712 PCTime: DHCP: Waiting for 15 seconds on interface FastEthernet4 000944: *Mar 1 06:48:54.712 PCTime: DHCP: Try 4 to acquire address for FastEthernet4 000945: *Mar 1 06:48:54.712 PCTime: DHCP: allocate request 000946: *Mar 1 06:48:54.716 PCTime: DHCP: zapping entry in DHC_PURGING state for Fa4 000947: *Mar 1 06:48:54.716 PCTime: DHCP: deleting entry 8238A634 0=2E0.0.0 from list 000948: *Mar 1 06:48:54.716 PCTime: Temp IP addr: 0.0.0.0 for peer on Interface: FastEthernet4 000949: *Mar 1 06:48:54.716 PCTime: Temp sub net mask: 0.0.0.0 000950: *Mar 1 06:48:54.716 PCTime: DHCP Lease server: 0.0.0.0, state: 9 Purging --More--  000951: *Mar 1 06:48:54.716 PCTime: DHCP transaction id: 1F69 000952: *Mar 1 06:48:54.716 PCTime: Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs 000953: *Mar 1 06:48:54.716 PCTime: Next timer fires after: 00:00:16 000954: *Mar 1 06:48:54.716 PCTime: Retry count: 0 Client-ID: cisco-0015.c653.9062-Fa4 000955: *Mar 1 06:48:54.716 PCTime: Client-ID hex dump: 636973636F2D303031352E633635332E 000956: *Mar 1 06:48:54.716 PCTime: 393036322D466134 000957: *Mar 1 06:48:54.716 PCTime: Hostname: cisco871 000958: *Mar 1 06:48:54.716 PCTime: DHCP: new entry. add to queue, interface FastEthernet4 000959: *Mar 1 06:48:54.716 PCTime: DHCP: SDiscover attempt # 1 for entry: 000960: *Mar 1 06:48:54.716 PCTime: Temp IP addr: 0.0.0.0 for peer on Interface: FastEthernet4 000961: *Mar 1 06:48:54.716 PCTime: Temp sub net mask: 0.0.0.0 000962: *Mar 1 06:48:54.716 PCTime: DHCP Lease server: 0.0.0.0, state: 1 Selecting 000963: *Mar 1 06:48:54.716 PCTime: DHCP transaction id: 1F6A 000964: *Mar 1 06:48:54.716 PCTime: Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs 000965: *Mar 1 06:48:54.716 PCTime: Next timer fires after: 00:00:04 000966: *Mar 1 06:48:54.716 PCTime: Retry count: 1 Client-ID: cisco-0015.c653.9062-Fa4 --More--  000967: *Mar 1 06:48:54.716 PCTime: Client-ID hex dump: 636973636F2D303031352E633635332E 000968: *Mar 1 06:48:54.720 PCTime: 393036322D466134 000969: *Mar 1 06:48:54.720 PCTime: Hostname: cisco871 000970: *Mar 1 06:48:54.720 PCTime: DHCP: SDiscover: sending 295 byte length DHCP packet 000971: *Mar 1 06:48:54.720 PCTime: DHCP: SDiscover 295 bytes 000972: *Mar 1 06:48:54.720 PCTime: B'cast on FastEthernet4 interface from 0.0.0.0 000973: *Mar 1 06:48:57.932 PCTime: DHCP: SDiscover attempt # 2 for entry: 000974: *Mar 1 06:48:57.932 PCTime: Temp IP addr: 0.0.0.0 for peer on Interface: FastEthernet4 000975: *Mar 1 06:48:57.932 PCTime: Temp sub net mask: 0.0.0.0 000976: *Mar 1 06:48:57.932 PCTime: DHCP Lease server: 0.0.0.0, state: 1 Selecting 000977: *Mar 1 06:48:57.932 PCTime: DHCP transaction id: 1F6A 000978: *Mar 1 06:48:57.932 PCTime: Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs 000979: *Mar 1 06:48:57.932 PCTime: Next timer fires after: 00:00:04 000980: *Mar 1 06:48:57.932 PCTime: Retry count: 2 Client-ID: cisco-0015.c653.9062-Fa4 000981: *Mar 1 06:48:57.932 PCTime: Client-ID hex dump: 636973636F2D303031352E633635332E --More--  000982: *Mar 1 06:48:57.932 PCTime: 393036322D466134 000983: *Mar 1 06:48:57.932 PCTime: Hostname: cisco871 000984: *Mar 1 06:48:57.932 PCTime: DHCP: SDiscover: sending 295 byte length DHCP packet 000985: *Mar 1 06:48:57.932 PCTime: DHCP: SDiscover 295 bytes 000986: *Mar 1 06:48:57.932 PCTime: B'cast on FastEthernet4 interface from 0.0.0.0 000987: *Mar 1 06:49:01.932 PCTime: DHCP: SDiscover attempt # 3 for entry: 000988: *Mar 1 06:49:01.932 PCTime: Temp IP addr: 0.0.0.0 for peer on Interface: FastEthernet4 000989: *Mar 1 06:49:01.932 PCTime: Temp sub net mask: 0.0.0.0 000990: *Mar 1 06:49:01.932 PCTime: DHCP Lease server: 0.0.0.0, state: 1 Selecting 000991: *Mar 1 06:49:01.932 PCTime: DHCP transaction id: 1F6A 000992: *Mar 1 06:49:01.932 PCTime: Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs 000993: *Mar 1 06:49:01.932 PCTime: Next timer fires after: 00:00:04 000994: *Mar 1 06:49:01.932 PCTime: Retry count: 3 Client-ID: cisco-0015.c653.9062-Fa4 000995: *Mar 1 06:49:01.932 PCTime: Client-ID hex dump: 636973636F2D303031352E633635332E 000996: *Mar 1 06:49:01.932 PCTime: 393036322D466134 000997: *Mar 1 06:49:01.932 PCTime: Hostname: cisco871 --More--  000998: *Mar 1 06:49:01.932 PCTime: DHCP: SDiscover: sending 295 byte length DHCP packet 000999: *Mar 1 06:49:01.932 PCTime: DHCP: SDiscover 295 bytes 001000: *Mar 1 06:49:01.932 PCTime: B'cast on FastEthernet4 interface from 0.0.0.0 001001: *Mar 1 06:49:05.932 PCTime: DHCP: QScan: Timed out Selecting state cisco871#

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Ideas?

Thanks

Reply to
tom

For testing purposes pull the access-list 101 from int fa 4 and try getting a dhcp address from COX again

conf t int fa 4 no ip access-group 101 in exit

It is very common for cable ISP to use network 10.0.0.0 for theiur internal infrastructure, so the DHCP server response may have a network

10 address.

Quite often the manufacturer's put the MAC address and the serial number on an external label. A MAC address is 12 Hexadecimal digit. D-LINK vendor code is 0080C8 which should be the first six digits of the MAC address

Did you use a PC directly connected to the COX cable modem when you first go the service or did you always have the D-LINK connected to the COX cabl emodem?

Do you have a Windows PC that you can put a DHCP server on along with Etherreal so we can get a packe trace of the DHCP packets that the Cisco 871W is sending ?

For testing purposes pull the access-list from FA 4

Reply to
Merv

You did it! It was the access-control that was the problem.

Thank you so much.

I tried to send some $ via paypal, but your email address is not registered with them. How about an Amazon Gift Certificate?

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000045: *Mar 1 09:31:39.255 PCTime: %DHCP-6-ADDRESS_ASSIGN: Interface FastEther net4 assigned DHCP address 68.6.112.XX, mask 255.255.252.0, hostname cisco871

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Reply to
tom

Glad it worked - that ia reward enough.

I had done a trace of DHCP on my sister-in-laws cable modem and the DHCP server had a an IP address of 10.x.x.x So when I saw your access-list, I wondered if that might be the issue.

Reply to
Merv

Also see if you can use this form of default static route

ip route 0.0.0.0 0.0.0.0 dhcp

Reply to
Merv

Will do.

Thanks a million.

Reply to
tom

BTW where did that access-list come from - did you hand-confgiure or was it generated by SDM?

If it was SDM this should be reported to Cisco because it will cause issues for others using SDM in a cable modem environment.

Cable operators use network 10 for as much of their infrastructure to conserve their registered IP address space which is a crtiical resource for them. So for example each cable modem get a network 10 address for managment purposes.

Reply to
Merv

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