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    PPTP disconnect brings IPsec VPNs down

    2.0-RC Snapshot Feedback and Problems - RETIRED
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    • D
      drees
      last edited by

      Bit more info.

      We see the PPTP user get logged out.  About 30 seconds later, the IPsec VPN's DPD detection kicks in and it starts trying to renegotiate but fails:

      Mar 23 15:38:40 fw-vista racoon: [x.x.x.x] INFO: DPD: remote (ISAKMP-SA spi=xxx) seems to be dead.
      Mar 23 15:38:40 fw-vista racoon: INFO: purging ISAKMP-SA spi=xxx.
      Mar 23 15:38:40 fw-vista racoon: INFO: purged IPsec-SA spi=yyy.
      Mar 23 15:38:40 fw-vista racoon: INFO: purged IPsec-SA spi=zzz.
      Mar 23 15:38:40 fw-vista racoon: INFO: purged ISAKMP-SA spi=xxx.
      Mar 23 15:38:40 fw-vista racoon: INFO: ISAKMP-SA deleted y.y.y.y[500]-x.x.x.x[500] spi:xxx

      Mar 23 15:38:49 fw-vista racoon: INFO: IPsec-SA request for x.x.x.x queued due to no phase1 found.
      Mar 23 15:38:49 fw-vista racoon: INFO: initiate new phase 1 negotiation: y.y.y.y[500]<=>x.x.x.x[500]
      Mar 23 15:38:49 fw-vista racoon: INFO: begin Identity Protection mode.
      Mar 23 15:38:49 fw-vista racoon: ERROR: phase1 negotiation failed due to send error. www
      Mar 23 15:38:49 fw-vista racoon: ERROR: failed to begin ipsec sa negotication.

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      • D
        drees
        last edited by

        Hate to bump my own thread - but searching it doesn't seem like anyone else is seeing this… Anyone have any ideas at all?

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        • D
          drees
          last edited by

          I had a chance to test the original RC1 i386 build Sat Feb 26
          15:30:26 EST 2011 and it behaved the same way, so it's not an issue
          unique to the amd64 build…

          I'm a bit confused as to why I haven't received any response - I'm guessing I should enter a ticket?

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          • E
            eri--
            last edited by

            Can you try removing the second -b from that command and see if that fixes it?
            So from /sbin/pfctl -b $4 -b $5 do it /sbin/pfctl -b $4

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            • D
              drees
              last edited by

              No luck.

              Changed the pfctl line from /sbin/pfctl -b $3 -b $4 to /sbin/pfctl -b $4 with no change in behavior.  I noticed that my SSH connection into the box died as well.  Had to open a new one.

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              • M
                m1dst
                last edited by

                I can confirm that this is a problem on our installation too.

                We are running PPTP for road warriors, IPSEC Site2Site, MultiWAN.

                The only way to re-establish the IPSEC is to restart Racoon.

                2.0-RC3 (i386) built on Sun Aug 7 01:58:01 EDT 2011

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                • E
                  eri--
                  last edited by

                  Can you all confirm that you are using an interface ip on the loacl PPTP address configuration?
                  Can you also test to use another address there solves the issue?

                  Normally the latest snapshot should behave in this regard.

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                  • M
                    m1dst
                    last edited by

                    I can confirm I am currently using the same IP for PPTP and IPSEC and it is the public WAN interface IP.

                    I have now tried adding a virtual IP (a spare one in our block) and then setting that in the PPTP page.  When that was done, I couldn't connect to the VPN on the new IP.  Switch it all back and everything worked again.  So I can't tell if making the PPTP bind to a different IP solves the problem or not because I haven't got PPTP working.  I only get short maintenance windows so have to do quick tests.  Should I have done something else extra to get it to work?

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                    • E
                      eri--
                      last edited by

                      Read on the new snapshots that that ip is not a binding ip.

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                      • M
                        m1dst
                        last edited by

                        I completely understand that I was incorrectly configuring it.  User error!  I have changed the ServerIP to something else (within my internal range) and the IPSEC tunnels stay up when a user disconnects.  I shall keep everything running now to see if it is resolved 100%

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