Routing problem.
Greetings all,
I will try and make myself as clear as possible so please excuse my poor ascii
picture but it seems to help explanations better. I hope this question is
appropriate for the list but I dont know where else to ask. First I will give
some info :
Internet
|
Router
|
|
---------------
| tl0 | ----- -----------
| Box2 | |Hub|------|eth0 Box3|
| fxp1 fxp0| ----- -----------
--------------- |
/ | |
/ | |
/ -----------
/
/
-----
|Hub|-----------
----- |
| |
| |
| |
------------------
|eth0 Box1 eth1|
------------------
Networks Involved : 192.168.1.0/24
213.219.39.192/29
213.219.39.196/29
213.219.39.200/28
Router - 213.219.39.193
Box1 - Debian Linux workstation
eth0 : 192.168.1.92
Box2 - OpenBSD gateway
fxp0 : 192.168.1.50
fxp1 : 213.219.39.204
alias : 213.219.39.197
tl0 : 213.219.39.194
Box3 - Debian Linux Server
eth0 : 213.219.39.202
eth1 : 213.219.39.198
The problem is I cannot ping 213.219.39.198 from anywhere other than Box2 or
Box1. However I can ping 213.219.39.202 from anywhere. At first I thought that
it was because eth1 did not have a default route but I discovered that default
routes are assigned per computer not per interface. I put up a virtual
interface (213.219.39.197) on box2 so it can talk to 213.219.39.198 on box1.
The weird thing is that if I ping 213.219.39.198 from box3 then it recieves
the echo request, here is "tcpdump -i eth1 icmp" on box1 :
14:08:27.201192 192.168.1.92 > 213.219.39.198: icmp: echo request (DF)
14:08:28.197807 192.168.1.92 > 213.219.39.198: icmp: echo request (DF)
But it just never replies and I cannot figure out why. However if I ping from
box2 or box1 then it works :
14:10:50.909501 213.219.39.197 > 213.219.39.198: icmp: echo request
14:10:50.910048 213.219.39.198 > 213.219.39.197: icmp: echo reply (DF)
It appears that the eth1 interface does not know how to send a reply to the
host that pings it so that is why I tried to assign a default gateway to it
but that just stopped everything from working. So the question is, how can
I make eth1 on box1 reachable from everywhere. Thank you very much for your
time and I hope I have made my problem clear.
Regards, Friedrich.
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