kern/91032: invalid IP checksum under if_bridge(4)+em(4) combination

Gleb Smirnoff glebius at FreeBSD.org
Wed Dec 28 13:00:37 PST 2005


The following reply was made to PR kern/91032; it has been noted by GNATS.

From: Gleb Smirnoff <glebius at FreeBSD.org>
To: "Ralf S. Engelschall" <rse at FreeBSD.org>
Cc: FreeBSD-gnats-submit at FreeBSD.org
Subject: Re: kern/91032: invalid IP checksum under if_bridge(4)+em(4) combination
Date: Wed, 28 Dec 2005 23:55:23 +0300

 On Wed, Dec 28, 2005 at 09:45:38PM +0100, Ralf S. Engelschall wrote:
 R> Another workaround would have been to put into the box a 100baseTX NIC
 R> driven by fxp(4) instead of the 1000baseTX NIC driven by em(4). Because
 R> the combination of if_bridge(4) and fxp(4) I've running fine with mostly
 R> the same configuration on another server.
 
 Not all fxp(4) cards can do checksum offloading. If you put the one
 that can't, then the seconds workaround doesn't differ from the first
 one. An problem ins't em specific in this case probably.
 
 So important questions is: does the fxp card you used can do offloading?
 
 -- 
 Totus tuus, Glebius.
 GLEBIUS-RIPN GLEB-RIPE


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