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    Problem with DHCPv6 stops processing "Solicit XID" messages from clients.

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    • M
      mrzaz
      last edited by

      I have seen intermittent problems with DHCPv6 server that from time to time stops processing "Solicit XID" messages from clients.
      If I do a OFF/ON switching of the DHCPv6 server it starts working again.

      I have tested to have DHCP6 ENABLED and then go from RA Mode Unmanaged to Managed but then I only get

      112 3.803110 fe80::39cf:c6b0:4657:c4ed ff02::1:2 DHCPv6 147 Solicit XID: 0xc6266e CID: 00010001153faa28f46d04063ba8
      121 4.802511 fe80::39cf:c6b0:4657:c4ed ff02::1:2 DHCPv6 147 Solicit XID: 0xc6266e CID: 00010001153faa28f46d04063ba8
      361 6.802591 fe80::39cf:c6b0:4657:c4ed ff02::1:2 DHCPv6 147 Solicit XID: 0xc6266e CID: 00010001153faa28f46d04063ba8
      437 10.802745 fe80::39cf:c6b0:4657:c4ed ff02::1:2 DHCPv6 147 Solicit XID: 0xc6266e CID: 00010001153faa28f46d04063ba8
      540 18.803159 fe80::39cf:c6b0:4657:c4ed ff02::1:2 DHCPv6 147 Solicit XID: 0xc6266e CID: 00010001153faa28f46d04063ba8
      734 34.803762 fe80::39cf:c6b0:4657:c4ed ff02::1:2 DHCPv6 147 Solicit XID: 0xc6266e CID: 00010001153faa28f46d04063ba8

      If I then put DHCP Enabled to unchecked and press SAVE and then back to checked and press save, I get the following:

      1264 66.804653 fe80::39cf:c6b0:4657:c4ed ff02::1:2 DHCPv6 193 Request XID: 0xc6266e CID: 00010001153faa28f46d04063ba8 IAA: 2001:470:28:dd5::9266
      1161 60.223978 fe80::66e6:82ff:fed0:7695 ff02::1:2 DHCPv6 160 Renew XID: 0x646299 CID: 00010001176a28b564e682d07695 IAA: 2001:470:28:dd5::bd39
      1263 66.804490 fe80::82ee:73ff:fe18:9ab7 fe80::39cf:c6b0:4657:c4ed DHCPv6 166 Advertise XID: 0xc6266e IAA: 2001:470:28:dd5::9266 CID: 00010001153faa28f46d04063ba8
      1265 66.804983 fe80::82ee:73ff:fe18:9ab7 fe80::39cf:c6b0:4657:c4ed DHCPv6 166 Reply XID: 0xc6266e IAA: 2001:470:28:dd5::9266 CID: 00010001153faa28f46d04063ba8
      (This client had previously been assigned via DHCP)

      I then tried to release old assigned IP and renew again.
      208 26.592067 fe80::39cf:c6b0:4657:c4ed ff02::1:2 DHCPv6 147 Solicit XID: 0x5d953c CID: 00010001153faa28f46d04063ba8
      209 26.592375 fe80::82ee:73ff:fe18:9ab7 fe80::39cf:c6b0:4657:c4ed DHCPv6 166 Advertise XID: 0x5d953c IAA: 2001:470:28:dd5::9266 CID: 00010001153faa28f46d04063ba8
      244 27.591698 fe80::39cf:c6b0:4657:c4ed ff02::1:2 DHCPv6 193 Request XID: 0x5d953c CID: 00010001153faa28f46d04063ba8 IAA: 2001:470:28:dd5::9266
      245 27.592049 fe80::82ee:73ff:fe18:9ab7 fe80::39cf:c6b0:4657:c4ed DHCPv6 166 Reply XID: 0x5d953c IAA: 2001:470:28:dd5::9266 CID: 00010001153faa28f46d04063ba8
      (normal DHCP request/assignment)

      Then again tried different combinations of trying to force to stop working but could not do it.

      I also tried to compare 2 Solicit XID before and after I "restarted" the DHCPv6 but it was identical except "elapsed time" entry.
      Also did the same with 2 RA and they where identical.

      Can't put my finger on why sometimes the DHCPv6 server stops processing requests.

      I have seen that similar issues has been discussed in forum but no real answer. 
      If this has already been discussed to the end, send me a link where to read about it.

      I did tests on build Sat Jun 16 14:16:56 EDT 2012 and also earlier builds with same results.

      Best regards
      Dan Lundqvist
      Stockholm, Sweden

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      • D
        databeestje
        last edited by

        There are quite a few cases where the IPv6 support in ISC dhcpd is lacking. Out of leases is a good example.

        I suspect a lot of this will be tied up in 4.3

        1 Reply Last reply Reply Quote 0
        • M
          mrzaz
          last edited by

          That so, but in this case it was a "Windows 7 Ultimate Edition 64bit" client and not a mobile. :-)

          And as you could see, the Solicit message is sent but not acted on by the router.

          //Danne

          1 Reply Last reply Reply Quote 0
          • D
            databeestje
            last edited by

            To clarify, I meant the ISC dhcpd server in pfSense, and I suspect that version 4.3 will fix quite a few of the dhcp6 server issues. We are using 4.2.3 now.

            1 Reply Last reply Reply Quote 0
            • M
              mrzaz
              last edited by

              Ahh…  Thought you meant "ICS" as in IceCreamSandwitch" but see now that you wrote ISC... My fault.  bummer :-)

              Any estimates when 4.3 will be included ?
              Just curious, it is not critical for me as I am running in Unmanaged mode right now.
              It is more of a "i am exploring all aspects of IPv6" now when I finally have started looking into v6. :-)

              1 Reply Last reply Reply Quote 0
              • B
                bardelot
                last edited by

                @mrzaz:

                Any estimates when 4.3 will be included ?

                4.3 does not yet exist. The current version is 4.2.4

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                • M
                  mrzaz
                  last edited by

                  OK

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