[Bug 207087] kernel: r295285 in 10.2-STABLE breaks OpenVPN functionality

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207087

--- Comment #39 from George V. Neville-Neil <gnn at FreeBSD.org> ---
(In reply to g_amanakis from comment #38)

That does look suspicious.  In the ip_forward() routine we make a copy of the
mbuf first.  I will look at a patch that synchronizes the way these work.

I'd like to ask about your various MTUs.  Are the mismatched across any of the
links?  I ask because I am trying to get the code to misbehave here and I have
had a hard time getting that to happen.  In a simple, 3 host, test I'm trying
this:


source -> router -> sink

MTU   1500      576

When you say "em0 is set to 576, where, in your setup, does that exist?

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