From: Ivan (ivan@iip.net)
Date: Wed Jan 17 2007 - 06:03:37 ART
You must create int t100 where tunnell src/dst IP is IP from int S0/0.1. And
make int Dialer0 backup interface for int t100. Therefore if s0/0.1 work
correctly i.e. line protocol is up then t100 also must be up and Dialer0 will
be in suspended state.
Suppose int s0/0.1 is disconnected or down. Int tunnel100 also down such as
src/dst ip belong ip network there isn't in FIB. And backup interface is up.
You need to configure something like below:
int s0/0.1
ip add 1.1.1.1 255.255.255.0
int t100
ip add 100.100.100.100 255.255.255.0
tunnel src s0/0.1
tunnel dst 1.1.1.1
backup interface dialer0
int dialer0
ip route 0.0.0.0 0.0.0.0 dialer0
ip route 0.0.0.0 0.0.0.0 100.100.100.100
Note: You don't need to tune AD in default route because only one interface
can be up simultaneously.
On Wednesday 17 January 2007 10:20, mathew Fer wrote:
> Hello GS,
>
> I read the above article. Please have a look as it is very interesting one.
>
> URL -
> http://www.cisco.com/web/about/ac123/ac114/downloads/packet/pdf/PK182.pdf
>
>
> Now I just have 2 questions for GS.
>
> 1. Is the self-tunnel safe to implement?
> 2. I have the below requirement and much appreciated if you can help
> to come up with a suggestion based on the above configuration;
>
> I have a static route - "ip route 0.0.0.0 0.0.0.0 Dialer 0 30" for
> dial backup. dynamic routes learned from IGP are in routing table with
> specific routes with /24 etc but not the default.
> When we send originate a packet to a destination that does not match
> the specific routes in routing table (learned by IGP), router tries to
> dial the back up ISDN link (configured with Dialer 0 etc). In order to
> stop this, I have done a route - "ip route 0.0.0.0 0.0.0.0 serial
> 0/0.1" but I want to avoid this static route to WAN link as it gets
> congested etc. Is there a way to setup this 2nd static route to a
> self-tunnel so that it get black-holed locally rather than sending out
> to Serial 0/0.1 (WAN) while blocking unwanted dial ISDN calls?
>
> I am thinking if there is a way to get this default (set to (serial
> 0/0.1) to an IP address configured on a self-tunnels and tunnel
> destination being an IP address of other end of the Serial 0/0.1, it
> should black-holed locally and when the Serial 0/0.1 is down, "ip
> route 0.0.0.0 0.0.0.0 Dialer 0" will become active.
>
> Can you please help me to get this configuration clearly?
>
> Thanks in advance for your reply.
> Thanks
>
> Mathew
>
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-- Ivan
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