Routing question...

[Gerald Combs]

On Wed, 19 Mar 2003, Rusty Brown wrote:

> The Cisco router has a static route to the .11 network set up. It can
> hit the .11 interface on the Linux router, but not thru it to the .11
> client.

What is the output of 'netstat -nr' on the Linux boxes and 'sh ip route'
on the Cisco?

Try running "tethereal -i any icmp" or "tcpdump -i any icmp" on the router
box, and ping either from the client to the Cisco router or vice-versa.
You _should_ see each ICMP request and reply twice - once each for the
inbound and outbound interfaces.

You can also run tethereal/tcpdump on the client to see if the Cisco's
pings are reaching it, and where the responses are going.  Similarly, you
can use the commands

term mon
debug ip icmp

on the Cisco to see what's happening ping-wise on its end.

> As for the side note: A friend (who is less Linux savvy than I) has a
> classroom setup using this configuration. I was trying to help him get
> it working, and failed. :o( So, I'm turning to the group to straighten
> myself out. :o)
> 
> 
> --- Jeremy Fowler <jfowler at westrope.com> wrote:
> > No, I think he was talking about the routing table on the Cisco
> > router itself.
> > You need to let the Cisco router know how it can reach the
> > 172.17.11.0 network.
> > You tell it to send packets for 172.17.11.0 to 172.17.10.2 and not
> > it's external
> > default gateway (Internet).
> > 
> > On a side note, why the Class B private IP addresses? I'm assuming
> > your using
> > them purely as example and not as actual addresses...
> > 
> > > -----Original Message-----
> > > From: owner-kclug at marauder.illiana.net
> > > [mailto:owner-kclug at marauder.illiana.net]On Behalf Of Rusty Brown
> > > Sent: Wednesday, March 19, 2003 2:45 PM
> > > To: dt at xr7.org
> > > Cc: kclug at kclug.org
> > > Subject: Re: Routing question...
> > >
> > >
> > > Yes. There is a route to each 172.17.10. and 172.17.11. network
> > range
> > > with eth0 and eth1 as the interface to use. And a default route to
> > use
> > > 172.17.10.1 as the gateway.
> > >
> > >
> > > --- dt at xr7.org wrote:
> > > > On Wed, 19 Mar 2003, Rusty Brown wrote:
> > > > > Here's the "lab" setup. 2 linux boxes connected going thru a
> > Cisco
> > > > > router to get "outside". One linux box has 2 nics, the other 1.
> > The
> > > > 2
> > > > > nic box is routing (/proc/sys/net/ipv4/ip_forward = 1) for the
> > > > single
> > > > > nic box.
> > > > >
> > > > > Addresses are:
> > > > > Cisco router 172.17.10.1
> > > >
> > > > Do you have a route here pointing to 172.17.11.0/24 via the Linux
> > > > router?
> > > > You should have something like:
> > > > ip route 172.17.11.0 255.255.255.0 172.17.10.2
> > > >
> > > > dt
> > > >
> > > > --
> > > > Dean Troyer
> > > > dt at xr7.org
> > > >
> > >
> > >
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> > 
> 
> 
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