Cisco Router Config with a T1 Internet line


I currently have a T1 internet line with a Cisco 1720 router (Came with ISP), and I have a spare Cisco 2610. I am trying to configure this spare router exactly as the 1720 router, and when I plug the cable to this spare router WIC DSC T1 card, the light turn green, so the serial link is OK. I plug a pc to the router ethernet port, and I was able to ping the router e0 ip address. However, I was not able to ping the ip on the serial0 interface and couldn't get out to the internet. Why can't I even ping the Serial0 interface ip address? I compare the configuration on my Cisco 1720 and Cisco

2610, and they are exactly the same? Did I configure something wrong on my Cisco router (I made up the ip address, not the real one assigned by my ISP)? His is a "Show Version" and "Show Running-Config" on my Cisco 2610 router. Please tell me what I did wrong.

Thanks, Alan

CISCO#sh ver Cisco Internetwork Operating System Software IOS (tm) C2600 Software (C2600-IS-M), Version 12.0(7)T, RELEASE SOFTWARE (fc2) Copyright (c) 1986-1999 by cisco Systems, Inc. Compiled Tue 07-Dec-99 02:21 by phanguye Image text-base: 0x80008088, data-base: 0x80C524F8

ROM: System Bootstrap, Version 11.3(2)XA4, RELEASE SOFTWARE (fc1)

MRBI uptime is 3 days, 33 minutes System returned to ROM by power-on System image file is "flash:c2600-is-mz_120-7_T.bin"

cisco 2610 (MPC860) processor (revision 0x203) with 30720K/10240K bytes of memory. Processor board ID JAD03423750 (2465751866) M860 processor: part number 0, mask 49 Bridging software. X.25 software, Version 3.0.0.

1 Ethernet/IEEE 802.3 interface(s) 1 Serial network interface(s) 32K bytes of non-volatile configuration memory. 8192K bytes of processor board System flash (Read/Write)

Configuration register is 0x2102

CISCO#sh run Building configuration...

Current configuration: ! version 12.0 service timestamps debug uptime service timestamps log uptime service password-encryption ! hostname CISCO ! logging buffered 4096 debugging enable secret 5 $1$2sq5$NsoY35XtYFWabcdpAN2xT0 enable password 7 151F1E0011111A20253A3B76475E ! ! ! ! ! memory-size iomem 25 ip subnet-zero ip name-server ip name-server ! ! ! ! ! interface Ethernet0/0 ip address no ip directed-broadcast ! interface Serial0/0 ip address no ip directed-broadcast no fair-queue ! ip classless ip route no ip http server ! ! line con 0 transport input none line aux 0 line vty 0 4 password 7 04561E0BBB284D4A04100B login ! end

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You shouldn't post configs with passwords and/or actual IP's

You should post the full (minus above) config of the 1721 for comparison though...looks like you're missing some stuff on the serial interface offhand. (or T1 controller).

Reply to
john smith

I certainly aggree with obfuscating passwords but when doing it to IP address's if you're not real careful you could wind up masking the reason behind the routing problem.

Reply to
Rod Dorman

Please read my post, I did say (I made up the ip address, not the real one assigned by my ISP)? Also, the encrypted password I posted wasn't the real one I used for my router, I know there are software that can decrypt it, so basically nothing I posted is real except the config. Why can't someone just answer my question by pointing out why my config look exactly the same as my old router but didn't work? Is it beacause of the image file? I know there are many version of an image file for a particular router and feature sets. Does my router have the feature sets to be used for this purpose based on the "sh ver"

Thanks, Alan

Reply to
Alan Siu

Couple of things: back to basics

  1. verify you are the DTE.

  1. verify IP's on serial0 / subnet

  2. do a sh ip int bri and make sure it is up/up

  1. Am not sure about the image.. if you have a CCO login, you can go and check the versions and make sure you are running the latest general release IOS.

are the configs the same for serial0 on both routers? verify the line is up.

Alan Siu wrote:

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