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Connecting a Cisco 2600 to TW Telecom

Posted on 2010-11-18
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Last Modified: 2012-05-10
We are moving from a DS3 to TW Telecom. I have been working on configuring a router to connect between our Juniper SSG and TW due to the way they did our IP blocks. I have configured both ethernet ports with a basic config just to pass traffic to our firewall. What is driving me nuts is that I can hit both ethernet ports from the outside. I can also ping our side of the ethernet from behind the firewall. Below is the config I am using:

interface FastEthernet0/0
 ip address <TW IP Block> 255.255.255.252
 speed 100
 full-duplex
!
interface Serial0/0
 no ip address
 encapsulation ppp
 shutdown
 no fair-queue
 ppp multilink
!
interface FastEthernet0/1
 ip address <our new IP block> 255.255.255.248
 speed 100
 full-duplex
!
interface Serial0/1
 no ip address
 encapsulation ppp
 shutdown
 ppp multilink
!
no ip http server
ip classless
ip route 0.0.0.0 0.0.0.0 <TW Telecom route>

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Question by:Rodney Barnhardt
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Author Comment

by:Rodney Barnhardt
ID: 34168158
Sorry. Also meant to add that from the outstide, that while I can hit both FE ports on the router, I cannot hit the port on the Juniper device. Also, while I can ping the FA0/1 port from behind the firewall, I cannot ping the FA0/0 port. This has to be some kind of routing problem, I just cannot figure it out.
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Expert Comment

by:danielc25
ID: 34176923
Are you routing 0.0.0.0/0 on the FW to the IP of FE 0/1 on the 2600? Can you paste a show ip route?
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Accepted Solution

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Rodney Barnhardt earned 0 total points
ID: 34177892
The problem ended up being in the firewall. I worked with TW support today and they confirmed the router was correct. I hade taken the code from a production NS25 and modified it for the SSG. I went back and recoded the config file and replaced it on the SSG. Everything came up and the problem was resolved.
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Author Closing Comment

by:Rodney Barnhardt
ID: 34203799
I found the problem myself
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