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Subject: Weird cipe problem...
From: Nathan Neulinger <nneul,AT,umr,DOT,edu>
Date: Wed, 22 Aug 2001 02:04:39 +0200

(Peter - I found out that the iproute2 stuff actually wasn't being used,
and it was actually going assymettric. So I decided to try it your way,
with changing to just using default route/host route. It was working
fine, but I didn't like the assymettric route. Very inneficient for
certain ip's that I use frequently.)

I reconfigured the setup to be more like the examples - default route
over cipe link, host route to my cable modem gateway:

Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt
Iface
10.0.2.1        0.0.0.0         255.255.255.255 UH       40 0          0
cipcb0
192.55.114.253  216.229.79.1    255.255.255.255 UGH      40 0          0
eth0
216.229.93.16   0.0.0.0         255.255.255.240 U        40 0          0
eth1
216.229.78.0    0.0.0.0         255.255.254.0   U        40 0          0
eth0
131.151.0.0     10.0.2.1        255.255.0.0     UG       40 0          0
cipcb0
127.0.0.0       0.0.0.0         255.0.0.0       U        40 0          0
lo
0.0.0.0         10.0.2.1        0.0.0.0         UG       40 0          0
cipcb0

This works great for most addresses, but not for others. For example, I
can telnet from 216.229.93.21 to 192.55.114.3 just fine, as well as to
yahoo:80, etc. But I cannot get to 131.151.32.21.

All I could find is that the router box is sending a icmp host
unreachable message when telnetting to 131.151.32.21. 

Now, here's the TOTALLY INSANE WEIRD part. If I start up
ethereal/tethereal/tcpdump on my router on ANY INTERFACE
(eth0/eth1/cipcb0) - it starts working and the telnet goes through
without the host unreachable message. Is that totally bizarre or what?

This is on kernel 2.4.7-ac3 with cipe-1.5.2.

-- Nathan

------------------------------------------------------------
Nathan Neulinger                       EMail:  nneul,AT,umr,DOT,edu
University of Missouri - Rolla         Phone: (573) 341-4841
CIS - Systems Programming                Fax: (573) 341-4216





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