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Date:      Mon, 13 Sep 1999 11:11:01 -0700 (PDT)
From:      kythorn@scorched.com
To:        freebsd-gnats-submit@freebsd.org
Subject:   kern/13736: enabling NAT on 3.3RC results in panic sbappendaddr.
Message-ID:  <19990913181101.7E8FF15649@hub.freebsd.org>

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>Number:         13736
>Category:       kern
>Synopsis:       enabling NAT on 3.3RC results in panic sbappendaddr.
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Sep 13 11:20:00 PDT 1999
>Closed-Date:
>Last-Modified:
>Originator:     Jay Oliver
>Release:        3.3RC
>Organization:
>Environment:
FreeBSD kythorn.upper.ul.warwick.net 3.3-RC FreeBSD 3.3-RC #0: Mon Sep 13 13:44:44 EDT 1999 root@kythorn.upper.ul.warwick.net:/usr/src/sys/compile/HAVOC  i386

>Description:
I have recently enabled NAT on my machine, and it has started crashing with a "Panic: sbappendaddr"

I had previously submitted this to freebsd-bugs, but was asked to open an official PR.

The machine is a p166 with 32 megs of ram.

It has two Linksys LNE100TX 10/100mbit ethernet cards.  Before I enabled NAT on this machine, it had one of these cards in it, for normal LAN usage.  I had no problems in that enviroment. 

Here is a trace from the latest crash:

Debugger(c02a0dbb,c3286f00,c050f880,c33f5f50,c017f4d7) at Debugger+0x42
panic(c02a23d2,c3286f00,c050f880,820f144,c33f5f70) at panic+0x74
sbappendaddr(c3286f44,c02f9630,c050f880,0) at sbappendaddr+0x2b
div_input(c050f880,14,c050f880,8169bc,820f144 at div_input+0x12a
ip_input(c050f880) at ip_input+0x69f
ipintr(c024dab3,0,27,27,820f144) at ipintr+0x4b
swi_net_next() at swi_net_next

coredumps and my debug kernel, or anything else you would find useful are available upon request, I do not know how to submit them with this interface. I apologize if I am doing anything wrong in submitting this, I have only been using FreeBSD for a couple of weeks, and am ignorant of official protocols and procedures.









>How-To-Repeat:
The problem repeats itself at seemingly random intervals.  It apparently has nothing to do with load, or network traffic, as I have transferred several hundred megabytes of data over FTP without a hitch, only to have it crash while I checked my email.
>Fix:


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


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