Comcast DHCP renewal problem?

Mar 05, 2006 3 Replies
G

Greetings.



I have a Motorola SB4100, which has been very reliable for my basic tier Comcast service.



In the past few months, I have experienced a problem where web pages will time out on first loading. They will usually work after selecting reload. Each time this has occurred, I check the modem's log, and always find this (latest example shown):


060302073149 5-Warning D103.0 DHCP RENEW WARNING - Field invalid in response
060302073149 4-Error D530.8 DHCP - Invalid Log Server IP Address.
060228133141 5-Warning D103.0 DHCP RENEW WARNING - Field invalid in response
060228133141 4-Error D530.8 DHCP - Invalid Log Server IP Address.
060225013141 5-Warning D103.0 DHCP RENEW WARNING - Field invalid in response
060225013141 4-Error D530.8 DHCP - Invalid Log Server IP Address.
060221185030 8-Debug M570.2 Motorola CM certificate present
060221185030 8-Debug M571.7 CM Cert Upgrade Enabled. Initiate after Registration
060221185030 8-Debug I503.0 Cable Modem is OPERATIONAL

Note that in the earliest entries (Feb 21 2006), all is well. On Feb 25, the DHCP lease apparently expires (my router confirms that the current lease is for 4 days, 0 hours), and access starts to suffer. Why it even works at all with an expired lease, I can't say. Anyone else encountering this?



Thanks,


--Gene


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M

Gene, Me too.

Can you do an ipconfig /all on your PC when your down and post what it says? Also where in the country are you located? I'm in Trenton, NJ Here is my issue...which is very similiar to your's

I'm experiencing the following problem, I have tried changing out my cable modem (motorla) and my router (linksys) and the problem continues (all firmware is up to date, all the router's MAC address is cloned as it should be). I will be surfing the internet and then all of a sudden the pages will say "request has timed out". I have two computers (Tablet PC and Mac OS 10.4.) The internet will go out the same way on both at the same time. Now I also have a samba file server which works fine, but when the internet goes out, I notice the samba server which is a mapped drive on the PC says it is unavailable, but on the Mac the samba server is fine and I can use it even when the Internet goes down. When the internet is out, I also can't ping the router or the modem, or use the web-based interface for either, yet my ISP (Comcast) can ping the router and says all is fine.

I have run the ipconfig on the PC and when the internet works, it all looks normal, but when it the internet goes down, I get the following:

Autoconfig Ip address - a public IP but isn't the router IP (normally I get a private IP from my scope when the internet is working) The subnet mask will be 255.255.0.0 (normally it is 255.255.255.0) Default Gateway - nothing (which is of course why I don't have internet access).

I tried release and renew and that does nothing. If I turn off the computer, router, and modem. And then turn on router, modem, and then computer (in that order) it all works again. The only message that appears in the modem log during this is "DHCP RENEW WARNING - Field invalid in response", a warning not an error message.

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G

I got the firmware update for my router (Netgear WGR614v6). Interestingly, it would not install (I got a "memory allocation error"). I reset the router to factory defaults, and was then able to install the update. One of the items fixed by the update involved "DHCP renewal".

Service is working fine, for now. I'll just wait for the current lease to expire and see what happens.

--Gene

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G

Well, it's still broken. The SB4100 is unable to get a new DHCP lease when the current one expires:

060313211741 1-Emergency D522.0 DHCP Lease Expired. 060313001756 4-Error D102.0 DHCP REBIND sent - no response 060313001756 5-Warning D521.0 DHCP Lease Renewal Failure. 060313001751 4-Error D102.0 DHCP REBIND sent - no response 060313001751 5-Warning D521.0 DHCP Lease Renewal Failure. 060313001746 4-Error D102.0 DHCP REBIND sent - no response 060313001746 5-Warning D521.0 DHCP Lease Renewal Failure. 060313001741 5-Warning D523.0 DHCP Rebinding Timer Event. 060310091755 4-Error D101.0 DHCP RENEW sent - no response 060310091755 5-Warning D521.0 DHCP Lease Renewal Failure. 060310091750 4-Error D101.0 DHCP RENEW sent - no response 060310091750 5-Warning D521.0 DHCP Lease Renewal Failure. 060310091745 4-Error D101.0 DHCP RENEW sent - no response 060310091745 5-Warning D521.0 DHCP Lease Renewal Failure.

If I power cycle the modem, everything works, although it takes a few tries to get a lease:

060313212326 8-Debug I503.0 Cable Modem is OPERATIONAL 060313212326 7-Information B401.0 Authorized 060313212325 8-Debug F502.1 Bridge Forwarding Enabled. 060313212325 8-Debug F502.3 Bridge Learning Enabled. 060313212325 7-Information B0.0 Baseline Privacy 060313212323 7-Information X518.9 Configuration - MMFMMD - Unit Update Enabled by CVC 060313212323 8-Debug I500.1 DOCSIS 1.0 Registration Completed 060313212323 7-Information I500.4 Attempting DOCSIS 1.0 Registration 060313212323 7-Information D509.0 Retrieved TFTP Config File SUCCESS 060313212323 7-Information D507.0 Retrieved Time....... SUCCESS 7-Information D511.0 Retrieved DHCP .......... SUCCESS 5-Warning D3.0 DHCP WARNING - Non-critical field invalid in response 4-Error D530.8 DHCP - Invalid Log Server IP Address. 5-Warning D520.2 DHCP Attempt# 4 BkOff: 5s Tot DSC:4 OFF:1 REQ:1 ACK:1 3-Critical D1.0 DHCP FAILED - Discover sent, no offer received 5-Warning D520.2 DHCP Attempt# 2 BkOff: 5s Tot DSC:2 OFF:0 REQ:0 ACK:0 3-Critical D1.0 DHCP FAILED - Discover sent, no offer received 5-Warning D520.2 DHCP Attempt# 1 BkOff: 4s Tot DSC:1 OFF:0 REQ:0 ACK:0 3-Critical D1.0 DHCP FAILED - Discover sent, no offer received 7-Information D0.0 DHCP CM Net Configuration download and Time of Day 7-Information T500.0 Acquired Upstream .......... SUCCESS 8-Debug T503.1 Acquire US with status OK, powerLevel 36, tempSid 5128 8-Debug T505.0 Acquired Upstream with status OK 7-Information T501.0 Acquired Downstream (693000000 Hz)........ SUCCESS 8-Debug T509.0 Acquired DS with status OK, DS Freq 693000000, US Id 4 7-Information I510.0 *** BOOTING *** SB4100-1.4.9.0-SCM00-NOSH

This is a fairly recent behavior; anyone else encountering it?

--Gene

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