[Asterisk-Users] OT: Linux routing with T100P problems

[Adam Fineberg]

Matthew Boehm wrote:

>Hey gang,
> I was successful in recompiling my 2.4.20 kernel to support HDLC. I was
>successful in hooking up our T1 line into the zap card. I was successful in
>being able to ping equipment on the other end of the T1. I was unsuccessful
>in pinging the outside world from the other end of the T1.
>
>I've attached a cheezy image of the network. Here is the routing table:
>
>[root at asterisk root]# route
>Kernel IP routing table
>Destination     Gateway         Genmask         Flags Metric Ref    Use
>Iface
>10.0.5.2           *             255.255.255.255 UH    0         0        0
>hdlc0
>10.0.0.0           *               255.255.255.0   U       0         0
>0    eth1
>10.0.3.0           *               255.255.255.0   U       0         0
>0    eth1
>65.78.109.0     *               255.255.255.0   U       0         0        0
>eth0
>127.0.0.0         *               255.0.0.0           U       0         0
>0    lo
>default       65.78.109.2     0.0.0.0               UG    0         0
>0    eth0
>
>There are 2 NICs (10.0.3.10, 65.78.109.10) and 1 T100P (10.0.5.1) on this
>box.
>
>Like I said above, from this machine I can ping everything in every attached
>network and the outside world. For some reason, I cannot ping the outside
>world if I am comming from the 10.0.0.* network on the diagram. From that
>network, I can ping 10.0.5.1 (this box) but nothing else.
>  
>

Do you have net.ipv4.ip_forward set to 1 in /proc?

>I'm a little stumped. My iptables are completly empty. If this is waaayyy
>off topic, please contact me off list. But I figured since it was related to
>the T100P it might be relevant.
>
>What can I use to find out why packets destined for the outside world (via
>65.78.109.2) are not being routed?
>  
>

Try ethereal for packet watching.

Adam