linux-kernel - e1000 is subtly incompatible with jumbo frames

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <a06240409c5d5e74a49d0@[129.98.90.227]>
Date:	Thu, 5 Mar 2009 17:14:47 -0500
From:	Maurice Volaski <mvolaski@...om.yu.edu>
To:	linux-kernel@...r.kernel.org
Cc:	jesse.brandeburg@...el.com, jeffrey.t.kirsher@...el.com
Subject: e1000 is subtly incompatible with jumbo frames

I have a system using the e1000 driver with the MTU set to 9000. If I 
try FTP to get a file, the transfer does not start. Something about 
the 9000 MTU is preventing the NIC from receiving packets back from 
the FTP server. (The FTP server is on the same subnet and its NIC 
also has MTU 9000.) The 9000 MTU NIC works fine in every other 
respect, even allowing me to access the system via ssh. When I change 
the MTU to 1500, then FTP works fine. The problem is common to 
numerous kernel versions including 2.6.24 through 2.6.29-rc5.
-- 

Maurice Volaski, mvolaski@...om.yu.edu
Computing Support, Rose F. Kennedy Center
Albert Einstein College of Medicine of Yeshiva University
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/