From: Oren Laadan <orenl@cs.huji.ac.il>
To: linux-kernel@vger.rutgers.edu, mj@atrey.karlin.mff.cuni.cz
Subject: [BUG] arp replies with BOOTP (nfsroot)
Date: Wed, 2 Dec 1998 22:36:45 +0200 (IST) [thread overview]
Message-ID: <199812022036.WAA29482@mos220.cs.huji.ac.il> (raw)
Hi,
While trying to setup nfsroot with BOOTP protocol, we discovered a
serious bug with incorrect ARP handling. [ Kernel: 2.1.129 ]
It appears that while the kenerl is waiting for a reply to a BOOTP
request sent earlier, it mishandles ARP requests. In particular,
it replies to every "arp who-has THIS_IP" with "THIS_IP is MY_NIC_ADDR":
that is, publish its own NIC address as matching EVERY local IP.
Effectively, this means it operates as a NIC proxy (well, it doesn't
really do anything but reply to ARP requests...).
As a result, other machines in the network become confused, eventually
leading to serious networking problems.
We suspect the problems is in net/ipv4/ipconfig.c:c_bootp_route_lookup()
(hooked during initialization instead of the default route lookup
function).
Any hints ?
Oren.
__________________________________________________________________________
______ ____ ___ ___ _ __ \
MOSIX Development Group ) ) ) ) ) ( ' ) \ / Oren Laadan \
The Hebrew University / / / / / \ / / orenl@cs.huji.ac.il \
of Jerusalem, Israel ( ( (___( ___) _(_ __/ \_______________________)
http://www.mosix.cs.huji.ac.il
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next reply other threads:[~1998-12-02 23:19 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
1998-12-02 20:36 Oren Laadan [this message]
1998-12-03 16:20 ` [BUG] arp replies with BOOTP [more info] Oren Laadan
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