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kern/38388: ipnat won't let GRE get redirected
>Synopsis: ipnat won't let GRE get redirected
>Arrival-Date: Tue Apr 08 21:55:00 +0000 2008
>Originator: Quentin Garnier
>Release: NetBSD 4.0
ipnat will drop incoming GRE packets if you try to redirect that
Also, the PPTP proxy (undocumented of course) doesn't work.
Maybe that's worth another PR, maybe not.
Redirect GRE in any way, specifically or not.
rdr on iface external/32 -> internal/32 gre
rdr on iface external/32 -> internal/32
And note that protocol 47 doesn't get through. With the second
line, protocol 46 and 48 do get through.
Remove all the remaining references to IPPROTO_GRE in the code of
ipfilter does solve the issue (but does not make the pptp proxy
work of course).
A lot of them are already commented out. I'm not sure exactly
which of the remaining ones is the culprit, but commenting them
all out was enough for me.
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