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Date: Wed, 15 Dec 1999 09:46:04 -0500 (EST)
From: Mikhail Teterin <mi@kot.ne.mediaone.net>
Reply-To: mi@kot.ne.mediaone.net
To: FreeBSD-gnats-submit@freebsd.org
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Subject: kern/15494: over-natd connections hang if MTUs are different
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>Number:         15494
>Category:       kern
>Synopsis:       over-natd connections hang if MTUs are different
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Dec 15 06:50:00 PST 1999
>Closed-Date:
>Last-Modified:
>Originator:     Mikhail Teterin
>Release:        FreeBSD 3.3-STABLE i386
>Organization:
Virtual Estates, Inc.
>Environment:

	A gateway machine with two interfaces -- public and private
	running natd. A client machine with one interface.

	The problem observed with the FreeBSD-3.3 (x86) client and
	with the Linux Redhat-6.0 client (on Alpha).

>Description:

	The MTUs on the gateway's interfaces are set to 900 (seems
	to work better with this ancient 3Com ISA cards). The client's
	MTU was set to 1500.

	Any TCP connection made by the client (handled by the gateway's
	natd) would soon hang in the middle of data transfer.

>How-To-Repeat:

	See description
>Fix:
	
	Use the same MTU on the client.

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


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