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Subject: [Bug 194238] [tcp] Ping attempted with MTU 9000 transmits fragmented
 packets of size 1500
Date: Mon, 20 Oct 2014 12:44:27 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194238

Alexander V. Chernikov <melifaro@FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |melifaro@FreeBSD.org

--- Comment #1 from Alexander V. Chernikov <melifaro@FreeBSD.org> ---
can you show 'route -n get <address>' on both machines?
This is the typical problem which can happen when you first configure addreses
(so on-interface routes with default MTU gets installed) and then you configure
MTU.
In that case interface MTU will be 9k, but interface routes MTU will be still
1500.

You can either manuall fix this by issuing route modify <prefix> -mtu 9000 or
to configure MTU at startup along with interface addresses.

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