IPsec VPN "site to site" USG20<-> USG40

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  • mMontana
    mMontana Posts: 1,337  Guru Member
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    VPN Connection, EXTERNAL OFFICE side. 
    Enable "Advanced" settings. Nailed Up is selected?
  • serverpal
    serverpal Posts: 29  Freshman Member
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    Hi,
    Error was in external zywall configuration.
    LAN3 had lan 192.168.8.1 (same HEADQUARTER 192.168.8.0/24).
    now I ping from external to headquarter and viceversa but not all ip.
    example:
    in HEADQUARTER there is:
    192.168.8.2
    192.168.8.7
    192.168.8.8
    ...

    from external office I ping .7 and .8 but not .2

    why?
  • mMontana
    mMontana Posts: 1,337  Guru Member
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    What is 192.168.8.2?
  • serverpal
    serverpal Posts: 29  Freshman Member
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    192.168.8.2 is a iSeries Server (as400).
    from external office I can connect to headquarters by SSL secureextender client (usg40 HEADQUARTERS has SSL VPN configured), in secureextender insert HeadQuarters public IP, user and password and then get connection and I reach iSeries server by ping 192.168.8.2 but not with VPN IPSec site to site.
  • sadatvid
    sadatvid Posts: 1
    edited December 2021
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    Please help to check if both USG security policy Wan to Device have service port NATT? [.](https://instasave.onl/) 
  • serverpal
    serverpal Posts: 29  Freshman Member
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    yes, USG HEAD and USG EXTERNAL have NATT in Wan to Zywall security policy
  • mMontana
    mMontana Posts: 1,337  Guru Member
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    I am no expert at all of iSeries Server. Maybe there are some options on TCP/IP and firewall setting for allow connection from other subnets?
    Moreover: does your iSeries server has the gateway configured?
  • PeterUK
    PeterUK Posts: 2,857  Guru Member
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    Does 192.168.8.8 have ICMP allow on its firewall?

    Is the subnet at the other end really /24 ?


  • Zyxel_Cooldia
    Zyxel_Cooldia Posts: 1,462  Zyxel Employee
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    Hi @sadatvid,

    Does the USG40 have subnet 192.168.2.x/24?  we have default subnet 192.168.2.x/24 on LAN 2.
    It would have subnet overlapping with peer USG20 LAN IP.

    Default interface setting in USG.

  • serverpal
    serverpal Posts: 29  Freshman Member
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    Hi, thank you for your help.
    I can't solve connection to iSeries (AS400).
    If I use Zywall secuExtender client from pc into external office I can ping As400 and connect to terminal emulation (by client access emulator port 23 telnet).
    IPSec (Ikev1) works with all ip of HEADQUARTERS Lan but not with iSeries.
    what is the difference?

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