[CUWiN-Dev] Not routing to a connected user... missing something?

[David Young]

On Wed, Apr 05, 2006 at 04:19:58PM -0500, Rob Simmons wrote:
> This is a (probably not very good) slice of the network topology that I'm
> dealing with, but I don't know if that element's too important. I currently
> have someone connected to a node (laptop, 10.0.106.141) that can connect two
> nodes which both connect to the tower in some number of hops, often just 0. 
> 
> West Tower <-> (0 or more links) <-> 10.0.241.179 <------> 10.0.106.141 
>                           \--------> 10.0.241.220 <-/
> 
> The sip0 interface on 10.0.106.141 is 10.20.21.254, and the IP address of
> the user's machine is 10.20.21.252. I can ping 10.20.21.252 from the node
> only - they seemed to have some success pinging from their computer out to
> 10.0.241.220 and other nearby nodes, but they definitely could not get out
> to the network, even though when I had left the node the night before it
> worked fine.
> 
> It doesn't seem to be their computer's fault, since I can ping it locally,
> and she claimed to even be receiving pings back from nearby nodes when I
> talked it over with her on the phone.
> 
> When I try to ping 10.20.21.254 (the local interface of the node), it works
> from pretty much anywhere. In every routing table I checked the next-hop
> entries for 10.20.21.254 and 10.20.21/24 were the same.
> 
> I confirmed that I could ping other computers remotely from elsewhere around
> the network, but when I try to ping 10.20.21.252 from anywhere besides the
> node it is connected to, I get lots and lots and lots of silence, but
> occasionally some messages in the style of:
> 
> root at 10.0.241.220 # ping -R 10.20.21.252
> PING 10.20.21.252 (10.20.21.252): 56 data bytes
> ping: sendto: No buffer space available
> ping: sendto: No buffer space available
> ping: sendto: No buffer space available
> ping: sendto: No buffer space available
> ping: sendto: No buffer space available
> 76 bytes from 10.0.233.19: Time To Live exceeded for icmp_seq=50
> ping: sendto: No buffer space available
> 76 bytes from 10.0.233.19: Time To Live exceeded for icmp_seq=51
> ping: sendto: No buffer space available
> ping: sendto: No buffer space available
> ping: sendto: No buffer space available
> 76 bytes from 10.0.241.179: Time To Live exceeded for icmp_seq=455

I am curious what 'traceroute -n 10.20.21.252' and 'traceroute -n
10.20.21.254' say.

Dave

-- 
David Young             OJC Technologies
dyoung at ojctech.com      Urbana, IL * (217) 278-3933