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Date: Sat, 19 Aug 2000 02:32:16 -0700 (PDT)
From: markm68k@yahoo.com
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Subject: misc/20713: errant traceroute output from behind natd
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>Number:         20713
>Category:       misc
>Synopsis:       errant traceroute output from behind natd
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sat Aug 19 02:40:00 PDT 2000
>Closed-Date:
>Last-Modified:
>Originator:     Mark Miller
>Release:        4.1-RELEASE
>Organization:
>Environment:
FreeBSD myhost 4.1-RELEASE FreeBSD 4.1-RELEASE #7: Mon Aug 14 21:32:29 PDT 2000     me@myhost:/usr/src/sys/compile/MYHOST  i386

>Description:
Setting up a firewall rule to send the icmp unreachable for a tcp connection causes the icmp response that is sent to say that the firewall itself is unreachable.

>How-To-Repeat:
1. install FreeBSD 4.1-RELEASE
2. configure an "open" firewall
3. configure a natd alias internal interface.
3. add a "unreach host-prohib" rule (e.g. telnet)
4. from a computer connected to the FreeBSD computer behind a natd connection, try to connect to the unreachable host via tcp (e.g. telnet)
5. watch the results from tcpdump.

>Fix:
unknown.


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


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