[Bug 191975] [ng_iface] [regression] in 10.0: cannot contact local services

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=191975

--- Comment #4 from dgilbert at eicat.ca ---
This is to say: that a host connecting trough an ng_iface interface can access
the rest of the network, but cannot access the host on which the ng_iface
resides.  _And_ this is a regression in 10.0.

OK.  This is a _really_ interesting example.  There are two MPD servers: A and
B.  A is .1 (both v4 and v6) and B is .3 (both v4 and v6).  The only difference
is that B has gif interfaces to give v6 services to mpd-connected clients.

If mpd client is connected to A:

WORKS: ssh -4 ...3
WORKS: ssh -6 ..:3
BROKE: ssh -4 ...1
WORKS: ssh -6 ..:1

If mpd client is connected to B:

BROKE: ssh -4 ...3
BROKE: ssh -6 ..:3
WORKS: ssh -4 ...1
WORKS: ssh -6 ..:1

ie: if the packet path includes ngX on the host in question, it fails.

mpd -> ngX -> gif -> ssh -> fail
mpd -> ngX -> gif -> otherhost -> ssh -> success

mpd -> ngX -> otherhost -> gif -> ssh -> success
mpd -> ngX -> otherhost -> gif -> otherhost -> ssh -> success

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