[1220] in linux-net channel archive
bug? Linux drops some broadcasts...
daemon@ATHENA.MIT.EDU (Vincent Cojot)
Tue Oct 17 05:08:20 1995
Date: Tue, 17 Oct 1995 01:46:51 -0400 (EDT)
From: Vincent Cojot <coyote@step.polymtl.ca>
To: linux-net@vger.rutgers.edu
Hi everyone,
This is my first post to this mailing list and I apologize if I
have not fully repected the etiquette on this mailing list. I don't
subscribe to this mailing list (yet! :) ) and the reason why I am posting
this now is that we are in a kind of little local emergency which seems
related to a linux problem...
In short, I am in need of help for one of our admins. They have a
set of 8 linux boxes and since the server has routing problems, they want
to drop this for solaris.. help!! (I am a student of that same lab who
likes linux better.. :) ). I can provide TCP DUMPS if necessary or simply
provide greater detail.
The server has this configuration:
--------SUNS---------------------
|
A------------- - - - GTW
|
--------LINUX-PCS----------------
A is the linux server with 3 SMC Ultras in it. It has 64MB Ram
and a P120 with an INtel MB.
SUNS and LINUX_PCS are ethernet segments connected to A and using
A as a gateway. All this works fine and all the workstations can
access the whole internet and some parts of the school.
A has IP forwarding in the kernel and is running routed+ypbind.
I tried 1.3.25 on A. same results than with 1.3.32, latter is
just a little more stable. 1.2.13 did not work well at all
(routing wise..)
The problem: "GTW" broadcasts sets of 4 packets every 30 seconds
saying were the various subnets in the school can be found and what is
their metric.
Linux on the server only sees packets 1 and 3 and drops all the
info in packets 2 and 4 (netstat -nr does not show any of subnet routes
annouced by packets 2 and 4 but shows all the routes from packets 1 and 3)
(we got that info with tcpdump: from the server, we see all four packets
but Linux's kernel routing table only sees packets 1 and 3).
GTW is an AIX machine.. it's an inner gateway for the school and
is an RS6000 runing AIX with gated. It's interconnecting most of the
school's local subnets to the internet and to other school's subnets.
Could it be that linux is too slow for handling these four
close-to-simultaenous broadcasts? Is it this test Kernel?
** Any help would be more than welcomed!! :) **
PS: please answer by email, I will post a summary once it has all been
resolved in case someone else has the same problem.
_________________________________________________________________________
Vincent S. Cojot, Computer Engineering.
Ecole Polytechnique de Montreal, Comite Micro-Informatique.
coyote@step.polymtl.ca, coyote@info.polymtl.ca
They cannot scare me with their empty spaces
Between stars - on stars where no human race is
I have it in me so much nearer home
To scare myself with my own desert places. - Robert Frost
