>Number: 184389
>Category: kern
>Synopsis: libalias fails to adjust MTU from jails
>Confidential: no
>Severity: non-critical
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sat Nov 30 10:00:00 UTC 2013
>Closed-Date:
>Last-Modified:
>Originator: Monkey
>Release: FreeBSD 9.2-RELEASE-p2 amd64
>Organization:
MonkeyBrains.net
>Environment:
System: FreeBSD papadum 9.2-RELEASE-p2 FreeBSD 9.2-RELEASE-p2 #0: Sat Nov 30
00:46:30 PST 2013 monkey@papadum:/usr/obj/usr/src/sys/GENERIC amd64
ipfw_nat, libalias
>Description:
MTU size is not properly discovered from packets generated from jails.
libalias and/or ipfw_nat
need to communicate with the network stack to determine MTU.
>How-To-Repeat:
Set up ipfw_nat to nat packets generated from a jail.
Send those packets to a second FreeBSD box that has a GRE tunnel to
third machine.
Attempt to ssh or scp a file larger than 1500 bytes from the jail to
the third machine -- it hangs.
If you SSH from the host (outside of the jail), the ssh connects.
If you quickly log into the jail, it will briefly work (OS remembers
MTU size for that path).
>Fix:
Set the MTU to 1476 on the interface connecting computer A to computer
B.
>Release-Note:
>Audit-Trail:
>Unformatted:
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