Question

Redundant ADSL Internet Connection with 2-WIC-ADSL Cisco 1700

Asked by: AtifNaeem

Hi,

I have a cisco 1700 router with:
      - 1 ethernet      (fastethernet 0)
      - 2 ADSL WIC    (atm0, atm1, dialer 0, dialer 1)
      - running IOS ADSL/IP/NAT : c1700-y7-mz.122-15.t2.bin

I am crruntly using 1700 for ADSL (UK) internet connection sharing using ADSL-WIC-0.


      |-----------|
      | r 1700  |--(ADSL-WIC0) 121.x1.x2.x3
e0--| 2 nats  |
      |   ?         |--(ADSL-WIC1) 121.y1.y2.y3
      |-----------|


Now bought a second ADSL connection and would like to  configure the router in a manner that if 1st connection goes down, the internet must still remain available to the internal network using 2nd ADSL connection.

I have 1 real ip for each ADSL dialer interface (no internal global ip's) and a local static address for ethernet0.

Please help me with sample configuration.

I could not find specific help on cisco website, neither I could find any command reference specific to solve the problem.

I look forward to your earliest help.

Thanks,

Atif

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Asked On
2003-06-20 at 02:12:36ID20654697
Tags

cisco

,

adsl

,

redundant

,

connection

,

1700

Topic

Asyncronous Transfer Mode (ATM)

Participating Experts
3
Points
500
Comments
9

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Answers

 

by: snoopy13Posted on 2003-06-23 at 06:30:03ID: 8781391

Well I think the only way to do this would be a manual switch over ie if the normal default route is dialer0 you would change it to dialer1. Normally you would do this using a routing protocol like EIGRP but I do not think that your ISP will support this. Another thing to keep in mind is that if you want to use this as a back-up circuit you need to make sure that the two lines are not going to one POP if they are and that POP goes down both your lines will be down this would be your single point of failure.

 

by: lrmoorePosted on 2003-06-30 at 05:29:56ID: 8827089

As long as both DSL lines are from the same company, simply use two static default routes using the two respective interfaces.
Example

ip route 0.0.0.0 0.0.0.0 ATM 0.1
ip route 0.0.0.0 0.0.0.0 ATM 1.1

Internet traffic will load-balance, and if one fails, all traffic goes out the other.

 

by: lrmoorePosted on 2003-07-02 at 09:24:08ID: 8841799

G'day, AtifNaeem,
There has not been any activity on this question in a while
Are you still working on this and need more information?
Or, can you go ahead and close it out?

Thanks!

 

by: tudorpopPosted on 2003-07-11 at 05:36:56ID: 8901851

Hello,

In order to save money you can place the following on the Primary ATM interface:
 
 backup-interface ATM 1.1

Hope this helps,
 Tudor POP

 

by: lrmoorePosted on 2003-07-18 at 08:00:18ID: 8952410

G'day, AtifNaeem
There has not been any comment from you on this question in 28 days. Do you still need assistance, need more information, or have you solved your problem?
Can you close out this question?

 

by: AtifNaeemPosted on 2004-05-18 at 00:16:02ID: 11095836

Dear Admin,

I am still seeking some 'Expert' Answer, Solution, sample configuration script on this question,

I request not to force accept the comment as solution, because its not acceptable to me and i know there is some way to do the asked,

also tell me is there some way I can take back the question points if I do not get proper answer

Cheers

Atif

 

by: AtifNaeemPosted on 2004-05-18 at 00:24:06ID: 11095860

Dear Admin,

Pls return back my points...

I posted the identical question on same date on other area as well, and I am hopeful of good response, the above respondents, need to see that one for info

http://www.experts-exchange.com/Networking/Broadband/DSL_Cable/Q_20654690.html

Thks

Atif

20120131-EE-VQP-002

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