We help IT Professionals succeed at work.
Get Started

Cisco T1 configuration for T1 to Ethernet handoff for Sonicwall wan connection

sdholden28 asked
Last Modified: 2016-01-22
I have an active, non-managed T1 connection that I've become responsible for implementing as a backup wan connection. There is a sonicwall firewall/router in place currently. There is no managed router or other device for the T1 connection at the moment, so I plan to put a spare cisco 1700 with a T1 card in to use as a "T1 to ethernet converter" of sorts. I do not believe you can accomplish this by simply bridging the T1 port and an ethernet port (please correct me if I'm wrong here), so just a basic config is needed. I have *some cisco experience, but I've never tried to configure one for this purpose, so I'm just trying to wrap my head around the config. Here's my current train of thought.

I have this IP information from my provider:
Network WAN IP:       XX.XXX.167.60
Carrier WAN IP:       XX.XXX.167.61
Customer WAN IP:       XX.XXX.167.62
LAN BLOCK:       YY.YYY.191.72 (this is a /30 block so I'm assuming .72 is the gateway, .73 and .74 are usable)
Line Coding/Framing:       B8ZS/ESF (for DS1s)

Proposed config:
Patch cable from T1/DS1 to cisco WIC

Interface serial 0/0
service-module t1 clock source line
service-module t1 timeslots 1-24 speed 64
service-module t1 framing esf
service-module t1 linecode b8zs
ip address XX.XXX.167.62
encapsulation pppfair-que
no shut

interface FastEthernet 0/0
ip address YY.YYY.191.73

patch cable from Eth0/0 to Sonicwall WAN interface

Sonicwall WAN interface
IP: YY.YYY.191.74
Gateway YY.YYY.191.72

What else am I missing? I'm a little foggy on the carrier/wan/local IPs, as far as which goes where, so I may have that wrong or completely fubar'd. Also, I would like for the cisco to do ZERO routing or anything else, as the sonicwall will handle that. Basically, the cisco should be a bridge, so if someone could help with commands to disable that, I'd be grateful.
Watch Question
Top Expert 2014
This problem has been solved!
Unlock 1 Answer and 6 Comments.
See Answer
Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant

An Experts Exchange subscription includes unlimited access to online courses.

Get Started
Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

  • Troubleshooting
  • Research
  • Professional Opinions
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE