IP changing back and forth between VPN Server and ISP Server

SemiLucas Posts: 3  Freshman Member
First Comment
edited April 2021 in Security

I have configured a easy connection to a vpn server using wan connection thru 2ltp. 

Now wehn I check my IP online it keeps changing between the one the VPN Server provide me and the one from my ISP, back and forth.

Any idea where this could come from?



  • Blabababa
    Blabababa Posts: 151  Master Member
    First Anniversary Friend Collector First Answer First Comment


    Can you collect the  following information to check?

    1)     Show USG policy route

                      => SSH connect to USG and type CLI.

                      => Router# show policy-route

    2)     Show Windows routing table before L2TP connect to USG

                     => In Windows command prompt: use "route print -4" command to share the dumped information to us

    3)     Show Windows routing table after L2TP connect to USG

                     => In Windows cmd prompt, use route print -4 to dump the message again

  • SemiLucas
    SemiLucas Posts: 3  Freshman Member
    First Comment
    Thank you, I hope it helps.

    1)Router> show policy-route
    index: 1
      active: yes
      auto-disable: no
      user: any
      schedule: none
      interface: none
      tunnel: WIZ_L2TP_VPN
      sslvpn: none
      source: any
      destination: any
      DSCP code: any
      service: any
      srcport: any
      nexthop type: Auto
      nexthop: auto
      nexthop state: Not support
      auto destination: no
      SNAT: outgoing-interface
      DSCP marking: preserve
      connectivity-check: no

    2 / 3) No difference before and after:

    first before, 2nd after

    To be clear, I use a WAN coonection over l2tp

    wan1_ppp ist active and connected

  • SemiLucas
    SemiLucas Posts: 3  Freshman Member
    First Comment
    somehow forgot to post pic for step 2 / 3 -> https://snag.gy/Fxylt3.jpg
  • Zyxel_Cooldia
    Zyxel_Cooldia Posts: 1,444  Zyxel Employee
    First Anniversary 10 Comments Friend Collector First Answer
    Hi @SemiLucas,
    I see, so the USG is l2tp client, instead of l2tp server role. can you send me your configuration file via private message.

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