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    IPv6 Tunnel MTU and Routing Problems

    Scheduled Pinned Locked Moved 2.1 Snapshot Feedback and Problems - RETIRED
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    • J
      jmuge
      last edited by

      I am new here so please excuse any newbie mistakes I make.  I searched the forums but didn't find anything exactly pertaining to my issue.  The issue is that I created an IPv6 tunnel using a Hurricane Electric tunnel on pfSense 2.1.  Everything went well but while testing I noticed that I was only seeing an MTU of 1280 on the tunnel and the HE tunnel has an MTU of 1480.  After much searching and testing I found what I think is a bug in pfSense 2.1.  Using ifconfig in a shell I found the MTU of the gif interface is set at 1280.  The only setting in the GUI is for the MTU of the new opt interface created.  I tried multiple values for the MTU of the opt interface in the GUI but the MTU of the gif interface stayed at 1280.  I again used ifconfig in a shell to change the gif interface to an MTU of 1480 and everything works as it should and I get a tunnel MTU of 1480.  So it seems the GUI is not actually changing the MTU of the gif interface.  I guess this is the right place to report a potential bug if not please let me know or if I missed a setting somewhere please let me know.
      Thanks

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      • E
        eri--
        last edited by

        Just pushed a fix for this, to correctly set the interface mtu as configured.
        Try new snapshots it should behave better.

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        • J
          jmuge
          last edited by

          Thanks for the quick resolution of the MTU problem.  After upgrading to the newer snapshot the MTU problem is fixed and everything seemed to be working fine.  Then I upgraded to the newest snapshot dated Sat Feb 9 23:46:16 EST 2013 and the tunnel stopped working.  I am now having a different problem with the IPv6 tunnel.  I don't know if it was the newer snapshot or the reboot that made the problem show up.  The problem seems to be it is not setting a default IPv6 route in the routing table.  I can ping the tunnel on both ends but cannot connect to anything outside of that.  If I run "route -n add -inet6 default 2001:470:7b:e0::1" in a shell it seems to fix the problem but it doesn't survive a reboot.  After adding the default route I can ping and load webpages from IPv6 sites so as far as I can tell it's working.  I tried deleting the whole tunnel including the gif interface and then re-creating it and I still end up with the same routing problem.  Is this a problem or could I be doing something wrong?

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          • A
            athurdent
            last edited by

            You should do a gitsync or wait for a newer snapshot, see here: http://forum.pfsense.org/index.php/topic,58731.msg315026.html#msg315026

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            • J
              jmuge
              last edited by

              Thanks, I guess I should have looked around before posting.  Would have saved me some time too.  Oh well, live and learn.

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