Re: Cisco 1600 routing problem

[Brian Candler <B.Candler at pobox.com>]

On Sun, Dec 01, 2002 at 03:27:12PM +0000, Mohamadi ZONGO wrote:
> My ISP forgot to route back '172.16.0/24' to me.
> I notice this when i ask a frend to make a traceroute from somewhere
> on the internet to my LAN.
> I will see tomorow (monday) if all thing will be ok after my ISP
> set back the route to me.
> Tanks

OK, good luck. But remember that 172.16.0/24 is a private IP address range;
nobody anywhere on the Internet can traceroute to these addresses.

If you are able to use those addresses for outbound connectivity, it's
because your ISP is using NAT to translate them into some other, valid
public IP addresses.

Regards,

Brian.



> 
> At 19:53 30/11/2002, you wrote:
> >On Sat, Nov 30, 2002 at 06:03:16PM +0000, Mohamadi ZONGO wrote:
> >> I am seting up a router (ROUTER1, see picture below) to go to the 
> >internet
> >> via ROUTER2
> >
> >Your diagram was garbled, is this what you have?
> >
> >         .254    .2             .1
> >------------- R2 ----------------- R1 --------
> >172.16.0/24       192.168.0.0/30
> >
> >If so, router R1 needs to have a route back to 172.16.0.0/24 or it won't
> >work (try "show ip route" on R1 to see if it has)
> >
> >Since you are using RIP, just "redistribute connected" on R2 should do the
> >trick.
> >
> >RIP is a nasty protocol. Either use OSPF, or since your network is so
> >simple, just static routes will do.
> >
> >> # ping 192.168.0.1 is not OK (entry point of the second router)
> >> # traceroute 192.168.0.1
> >> traceroute to 192.168.0.1 (192.168.0.1 ), 30 hops max, 38 byte packets
> >>  1  fw  (|172.16.0.254)  4.098 ms *  2.046 ms
> >>  2 *
> >>  3 * etc ....
> >
> >That's what I'd expect if R1 had no route back to 172.16.0/24
> >
> >Cheers,
> >
> >Brian.
> >
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> 
> 

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