kern/64053: Broadcast storming after upgrading to patch SA04:04

[Daniel Austin]

>Number:         64053
>Category:       kern
>Synopsis:       Broadcast storming after upgrading to patch SA04:04
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Mar 10 06:50:13 PST 2004
>Closed-Date:
>Last-Modified:
>Originator:     Daniel Austin
>Release:        5.2.1-RELEASE-p1
>Organization:
Kewlio.net Limited
>Environment:
FreeBSD border3.ldn.kewlio.net 5.2.1-RELEASE-p1 FreeBSD 5.2.1-RELEASE-p1 #1: Fri Mar  5 22:32:45 GMT 2004     dan at border3.ldn.kewlio.net:/usr/obj/usr/src/sys/kewlio  i386
>Description:
Since upgrading to 5.2.1-RELEASE-p1, our freebsd router has been broadcast storming our LAN.
>How-To-Repeat:
If i send packets (tcp/udp/icmp) to the network or broadcast addresses of an interface on the router from a non-attached network (e.g. over the internet), the freebsd router duplicates these packets (1 packet becomes a few thousand packets).  The TTL appears to change through the packets.

e.g. telnet from home to .0 or .255 of a /24 configured on a remote server.

>Fix:
As a temporary fix, i have firewalled the broadcast and network addresses on the freebsd router.
>Release-Note:
>Audit-Trail:
>Unformatted: