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Date: Wed, 3 Jul 2002 01:11:34 -0700 (PDT)
From: Fabien Menemenlis <nihilist@dead-inside.org>
To: freebsd-gnats-submit@FreeBSD.org
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Subject: kern/40139: ipfilter issue
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>Number:         40139
>Category:       kern
>Synopsis:       ipfilter issue
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Jul 03 01:20:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     Fabien Menemenlis
>Release:        4.6-STABLE
>Organization:
Iliad
>Environment:
FreeBSD onepafw1 4.6-STABLE FreeBSD 4.6-STABLE #2: Thu Jun 27 16:12:37 CEST 2002     fabien@onepafw1:/usr/obj/usr/src/sys/FW  i386
>Description:
When using masqueradinig with ipnat, 2 boxes from the private network can't access the same destination "at the same time". Same problem with 3 firewalls (all 4.6-STABLE, ethernet interfaces fxp, xl or tl). The configuration was changed to ipfw + natd, no more problem.

>How-To-Repeat:
Simple configuration for ipnat:
map fxp0 192.168.0.0/16 -> 123.123.123.123/32 proxy port ftp ftp/tcp
map fxp0 192.168.0.0/16 -> 123.123.123.123/32 portmap tcp/udp 10000:65000
map fxp0 192.168.0.0/16 -> 123.123.123.123/32
and for ipf:
pass in from any to any
pass out from any to any

Log on 2 machines on the internal network, ping the same external IP at the same time: 1 is blocked. Stop the ping working, the other will then start working.

>Fix:
none (well, use ipfw + natd :P)

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

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