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    Packet loss when connected to L2TP/IPsec VPn

    IT Discussion
    edgerouter lite l2tp vpn
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    • wrx7mW
      wrx7m
      last edited by

      That is weird. Have you disabled and re-enabled the tunnel?

      1 Reply Last reply Reply Quote 0
      • RomoR
        Romo
        last edited by

        This is remote access not site to site by the way. I have indeed restarted the vpn and packet loss still is there.

        1 Reply Last reply Reply Quote 0
        • RomoR
          Romo @dafyre
          last edited by

          @dafyre said in Packet loss when connected to L2TP/IPsec VPn:

          Also, could this be an MTU settings issue? I know they're rare... but that was the first thing that popped into my mind.

          Was inded thinking about playing with the MTU, just now sure why it wouldn't on ATT. It is currently set for 1492

          JaredBuschJ 1 Reply Last reply Reply Quote 0
          • JaredBuschJ
            JaredBusch @Romo
            last edited by

            @Romo said in Packet loss when connected to L2TP/IPsec VPn:

            @dafyre said in Packet loss when connected to L2TP/IPsec VPn:

            Also, could this be an MTU settings issue? I know they're rare... but that was the first thing that popped into my mind.

            Was inded thinking about playing with the MTU, just now sure why it wouldn't on ATT. It is currently set for 1492

            UVerse? Then your service is PPPoE. You likely need to lower the MTU to account for it.

            Also If UVerse, you are screwed in your router options.

            wrx7mW RomoR scottalanmillerS 3 Replies Last reply Reply Quote 0
            • wrx7mW
              wrx7m
              last edited by

              I'm assuming that the performance outside the VPN connection is fine, right?

              1 Reply Last reply Reply Quote 0
              • wrx7mW
                wrx7m @JaredBusch
                last edited by wrx7m

                @JaredBusch said in Packet loss when connected to L2TP/IPsec VPn:

                @Romo said in Packet loss when connected to L2TP/IPsec VPn:

                @dafyre said in Packet loss when connected to L2TP/IPsec VPn:

                Also, could this be an MTU settings issue? I know they're rare... but that was the first thing that popped into my mind.

                Was inded thinking about playing with the MTU, just now sure why it wouldn't on ATT. It is currently set for 1492

                UVerse? Then your service is PPPoE. You likely need to lower the MTU to account for it.

                Also If UVerse, you are screwed in your router options.

                I haven't dealt with PPPoE since I stopped using DSL 12 years ago.

                JaredBuschJ 1 Reply Last reply Reply Quote 0
                • JaredBuschJ
                  JaredBusch @wrx7m
                  last edited by

                  @wrx7m said in Packet loss when connected to L2TP/IPsec VPn:

                  @JaredBusch said in Packet loss when connected to L2TP/IPsec VPn:

                  @Romo said in Packet loss when connected to L2TP/IPsec VPn:

                  @dafyre said in Packet loss when connected to L2TP/IPsec VPn:

                  Also, could this be an MTU settings issue? I know they're rare... but that was the first thing that popped into my mind.

                  Was inded thinking about playing with the MTU, just now sure why it wouldn't on ATT. It is currently set for 1492

                  UVerse? Then your service is PPPoE. You likely need to lower the MTU to account for it.

                  Also If UVerse, you are screwed in your router options.

                  I haven't dealt with PPPoE since I stopped using DSL 12 years ago.

                  U-Verse is just DSL2 or some variant there of.

                  1 Reply Last reply Reply Quote 1
                  • RomoR
                    Romo @JaredBusch
                    last edited by

                    @JaredBusch said in Packet loss when connected to L2TP/IPsec VPn:

                    @Romo said in Packet loss when connected to L2TP/IPsec VPn:

                    @dafyre said in Packet loss when connected to L2TP/IPsec VPn:

                    Also, could this be an MTU settings issue? I know they're rare... but that was the first thing that popped into my mind.

                    Was inded thinking about playing with the MTU, just now sure why it wouldn't on ATT. It is currently set for 1492

                    UVerse? Then your service is PPPoE. You likely need to lower the MTU to account for it.

                    Also If UVerse, you are screwed in your router options.

                    How low should I go, or is it just a matter of testing? Currently at 1400, web browsing is still not working properly.

                    Tracing route to 10.10.10.1
over a maximum of 30 hops:

  1     *      105 ms   102 ms  10.255.255.0
  2   118 ms   104 ms   102 ms  10.10.10.1

Trace complete.
PS C:\WINDOWS\system32> tracert 10.10.10.1

Tracing route to 10.10.10.1
over a maximum of 30 hops:

  1   106 ms   106 ms     *     10.255.255.0
  2   116 ms     *        *     10.10.10.1
  3   103 ms   109 ms   121 ms  10.10.10.1
                    JaredBuschJ 1 Reply Last reply Reply Quote 0
                    • JaredBuschJ
                      JaredBusch @Romo
                      last edited by

                      @Romo I do not recall what the TCP overhead is on PPPoE without looking it up.

                      1 Reply Last reply Reply Quote 0
                      • scottalanmillerS
                        scottalanmiller @JaredBusch
                        last edited by

                        @JaredBusch said in Packet loss when connected to L2TP/IPsec VPn:

                        @Romo said in Packet loss when connected to L2TP/IPsec VPn:

                        @dafyre said in Packet loss when connected to L2TP/IPsec VPn:

                        Also, could this be an MTU settings issue? I know they're rare... but that was the first thing that popped into my mind.

                        Was inded thinking about playing with the MTU, just now sure why it wouldn't on ATT. It is currently set for 1492

                        UVerse? Then your service is PPPoE. You likely need to lower the MTU to account for it.

                        Also If UVerse, you are screwed in your router options.

                        Not Uverse, it's their enterprise leased line.

                        1 Reply Last reply Reply Quote 0
                        • RomoR
                          Romo
                          last edited by

                          Been playing for the value for a while and still no luck. I am still seeing packet loss.

                          Edge router logs have been showing:

                          May  7 18:00:48 office pppd[24483]: pppd 2.4.7 started by root, uid 0
May  7 18:00:48 office pppd[24483]: Connect: ppp0 <-->
May  7 18:00:48 office pppd[24483]: Overriding mtu 1500 to 1474
May  7 18:00:48 office pppd[24483]: Overriding mru 1500 to mtu value 1474
May  7 18:00:50 office pppd[24483]: Unsupported protocol 'IPv6 Control Protocol' (0x8057) received
May  7 18:00:50 office pppd[24483]: Unsupported protocol 'Compression Control Protocol' (0x80fd) received
May  7 18:00:51 office pppd[24483]: Cannot determine ethernet address for proxy ARP
May  7 18:00:51 office pppd[24483]: local  IP address 10.255.255.0
May  7 18:00:51 office pppd[24483]: remote IP address 192.168.4.10
May  7 18:03:45 office pppd[24483]: Overriding mtu 1500 to 1474
May  7 18:03:45 office pppd[24483]: Overriding mru 1500 to mtu value 1474

                          Any other ideas?

                          JaredBuschJ 1 Reply Last reply Reply Quote 0
                          • JaredBuschJ
                            JaredBusch @Romo
                            last edited by

                            @Romo said in Packet loss when connected to L2TP/IPsec VPn:

                            Been playing for the value for a while and still no luck. I am still seeing packet loss.

                            Based on what @scottalanmiller said, I would not expect MTU to be involved.

                            RomoR 1 Reply Last reply Reply Quote 0
                            • RomoR
                              Romo @JaredBusch
                              last edited by

                              Ok even weirder behavior now, currently I am getting steady pings for a very short period of time and then the connections just seems to die.

                              MTU is currently set to 1472

                              Pinging 10.10.10.1 with 32 bytes of data:
Reply from 10.10.10.1: bytes=32 time=87ms TTL=127
Reply from 10.10.10.1: bytes=32 time=89ms TTL=127
Reply from 10.10.10.1: bytes=32 time=87ms TTL=127
Reply from 10.10.10.1: bytes=32 time=89ms TTL=127
Reply from 10.10.10.1: bytes=32 time=90ms TTL=127
Reply from 10.10.10.1: bytes=32 time=88ms TTL=127
Reply from 10.10.10.1: bytes=32 time=87ms TTL=127
Reply from 10.10.10.1: bytes=32 time=88ms TTL=127
Reply from 10.10.10.1: bytes=32 time=93ms TTL=127
Reply from 10.10.10.1: bytes=32 time=93ms TTL=127
Reply from 10.10.10.1: bytes=32 time=94ms TTL=127
Reply from 10.10.10.1: bytes=32 time=91ms TTL=127
Reply from 10.10.10.1: bytes=32 time=88ms TTL=127
Reply from 10.10.10.1: bytes=32 time=87ms TTL=127
Reply from 10.10.10.1: bytes=32 time=93ms TTL=127
Reply from 10.10.10.1: bytes=32 time=95ms TTL=127
Reply from 10.10.10.1: bytes=32 time=91ms TTL=127
Reply from 10.10.10.1: bytes=32 time=90ms TTL=127
Reply from 10.10.10.1: bytes=32 time=101ms TTL=127
Reply from 10.10.10.1: bytes=32 time=89ms TTL=127
Reply from 10.10.10.1: bytes=32 time=88ms TTL=127
Reply from 10.10.10.1: bytes=32 time=88ms TTL=127
Reply from 10.10.10.1: bytes=32 time=89ms TTL=127
Reply from 10.10.10.1: bytes=32 time=106ms TTL=127
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.

                              During that initial time, when the connection has just established web browsing also works close to normal speeds I would say. Really strange behavior.

                              1 Reply Last reply Reply Quote 0
                              • JaredBuschJ
                                JaredBusch
                                last edited by JaredBusch

                                I never have a problem with my VPN on my iPhone.

                                May  7 19:42:34 bna-jared xl2tpd[4722]: Connection established to 172.58.142.195, 50961.  Local: 48550, Remote: 4 (ref=0/0).  LNS session is 'default'
May  7 19:42:34 bna-jared xl2tpd[4722]: Call established with 172.58.142.195, Local: 3582, Remote: 2938, Serial: 1
May  7 19:42:34 bna-jared pppd[8432]: pppd 2.4.7 started by root, uid 0
May  7 19:42:34 bna-jared pppd[8432]: Connect: ppp0 <-->
May  7 19:42:34 bna-jared pppd[8432]: Overriding mtu 1500 to 1492
May  7 19:42:34 bna-jared pppd[8432]: Overriding mru 1500 to mtu value 1492
May  7 19:42:34 bna-jared pppd[8432]: Overriding mtu 1500 to 1492
May  7 19:42:35 bna-jared pppd[8432]: Warning - secret file /etc/ppp/chap-secrets has world and/or group access
May  7 19:42:35 bna-jared pppd[8432]: Unsupported protocol 'IPv6 Control Protocol' (0x8057) received
May  7 19:42:35 bna-jared pppd[8432]: local  IP address 10.255.255.0
May  7 19:42:35 bna-jared pppd[8432]: remote IP address 10.254.203.2
May  7 19:43:05 bna-jared pppd[8432]: Connection terminated: no multilink.
May  7 19:43:05 bna-jared pppd[8432]: Modem hangup

                                Here is my config.

                                set vpn l2tp remote-access authentication local-users username jbusch password 'SmegOff'
set vpn l2tp remote-access authentication mode local
set vpn l2tp remote-access authentication require mschap-v2
set vpn l2tp remote-access client-ip-pool start 10.254.203.2
set vpn l2tp remote-access client-ip-pool stop 10.254.203.10
set vpn l2tp remote-access dhcp-interface eth0
set vpn l2tp remote-access dns-servers server-1 8.8.8.8
set vpn l2tp remote-access dns-servers server-2 8.8.4.4
set vpn l2tp remote-access idle 1800
set vpn l2tp remote-access ipsec-settings authentication mode pre-shared-secret
set vpn l2tp remote-access ipsec-settings authentication pre-shared-secret SmegOff
set vpn l2tp remote-access ipsec-settings ike-lifetime 3600
set vpn l2tp remote-access ipsec-settings lifetime 3600
set vpn l2tp remote-access mtu 1492

                                The IP range is not used elsewhere in my router at all.

                                1 Reply Last reply Reply Quote 1
                                • RomoR
                                  Romo
                                  last edited by

                                  This was working properly until we switched to ATT. It is still properly reaching the router and also authenticating correctly to the radius server. It's just after connecting it completely craps out.

                                  1 Reply Last reply Reply Quote 0
                                  • jt1001001J
                                    jt1001001
                                    last edited by

                                    Switching to AT&T; what is the new carrier equipment? Did you go from cable modem to fiber?

                                    scottalanmillerS 1 Reply Last reply Reply Quote 0
                                    • scottalanmillerS
                                      scottalanmiller @jt1001001
                                      last edited by

                                      @jt1001001 said in Packet loss when connected to L2TP/IPsec VPn:

                                      Switching to AT&T; what is the new carrier equipment? Did you go from cable modem to fiber?

                                      Yes

                                      1 Reply Last reply Reply Quote 0
                                      • jt1001001J
                                        jt1001001
                                        last edited by

                                        Whe we switched one of our sites from then Cox cable modem to AT&T fiber we had a similar issue with our Cisco ASA's (at the time) not establishing the tunnel consistently. We had to turn on WebVPN on the ASA (wasn't on before) and turn off NAT-T then it established fine. Not sure of similar setting on Ubiquiti devices. I'll check my notes was years ago may have another setting to try

                                        1 Reply Last reply Reply Quote 1
                                        • RomoR
                                          Romo
                                          last edited by

                                          So two further days of usage and the vpn has been working properly again. At the end the day, I had reverted back to original settings so everything just apparently started to work back on its own??

                                          Really not sure what was causing the issue.

                                          wrx7mW 1 Reply Last reply Reply Quote 0
                                          • wrx7mW
                                            wrx7m @Romo
                                            last edited by

                                            @Romo said in Packet loss when connected to L2TP/IPsec VPn:

                                            So two further days of usage and the vpn has been working properly again. At the end the day, I had reverted back to original settings so everything just apparently started to work back on its own??

                                            Really not sure what was causing the issue.

                                            That is irritating that you don't know for sure what the fix was. Hopefully, it remains solid.

                                            1 Reply Last reply Reply Quote 1
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