gre and MONITOR

[Hiroki Sato]

Chip Marshall <chip at 2bithacker.net> wrote
  in <20130508155446.GB95890 at 2bithacker.net>:

ch> It appears the MONITOR flag doesn't work on gre interfaces.
ch>
ch> I have a GRE tunnel set up between a FreeBSD 8.2-RELEASE box and a
ch> Juniper router.
ch>
ch> Config on the FreeBSD end:
ch>
ch> gre0: flags=4b051<UP,POINTOPOINT,RUNNING,LINK0,LINK1,MULTICAST,MONITOR> metric 0 mtu 1476
ch> 	tunnel inet 10.162.163.133 --> 10.162.163.131
ch> 	inet6 fe80::20c:29ff:fe9f:de64%gre0 prefixlen 64 scopeid 0x6
ch> 	inet 10.200.0.2 --> 10.200.0.1 netmask 0xfffffffc
ch> 	nd6 options=3<PERFORMNUD,ACCEPT_RTADV>
ch>
ch> Config on the Juniper end:
ch>
ch> tunnel {
ch>     source 10.162.163.131;
ch>     destination 10.162.163.133;
ch> }
ch> family inet {
ch>     address 10.200.0.1/30;
ch> }
ch>
ch> And from the Juniper, I am able to ping the 10.200.0.2 IP on the
ch> FreeBSD end of the GRE tunnel. As I understand it, this shouldn't
ch> happen with the MONITOR flag there, right?

 The attached patch should fix this.  Can you try it?

-- Hiroki
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