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Date: Thu, 27 Jul 2000 12:27:47 -0700 (PDT)
From: larse@isi.edu
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Subject: kern/20227: 4.1-RC: UDP checksum problem
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>Number:         20227
>Category:       kern
>Synopsis:       4.1-RC: UDP checksum problem
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Jul 27 12:30:01 PDT 2000
>Closed-Date:
>Last-Modified:
>Originator:     Lars Eggert
>Release:        4.1-RC
>Organization:
USC/ISI
>Environment:
FreeBSD hbo.isi.edu 4.1-RC FreeBSD 4.1-RC #0: Mon Jul 24 16:24:30 PDT 2000     larse@hbo.isi.edu:/usr/obj/usr/src/sys/PRECISION  i386

>Description:
There seems to be a problem with the UDP checksum code. I've found that
multicast loopback packets are always dropped because of bad UDP 
checksum, but don't understand why.
>How-To-Repeat:

>Fix:
sysctl -w net.inet.udp.checksum=0

>Release-Note:
>Audit-Trail:
>Unformatted:


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