Randomly connection issue

qfabio
qfabio Posts: 3  Freshman Member
edited April 2021 in Security
Hi,
I have a zyxel firewall (USG20W-VPN) connected to a router modem.
Zyxel wan IP: 192.168.2.254 - Gateway: 192.168.2.1 - DNS 8.8.8.8
Modem Router IP: 192.168.2.1
FW lan 1 IP: 192.168.1.1 (connect all the pc and servers network)
DMZ IP: 192.168.0.1

firmware: v 4.38

randomly, about 4-5 times a day, the connection to internet is lost for some minutes.
Ist is something releted to the firewall because I connected a rasperry to another modem router port and it works without disconnection (from outside when the servers are offline the raspy is online)

When the internet connection restarts I login to the firewall interface and I see that the interfaces are up from few seconds. Also the session uptime is about 0 (few minutes), seems that the firewall has been restarted.

Please someone could help me?

Thanks a lot

All Replies

  • Zyxel_Cooldia
    Zyxel_Cooldia Posts: 1,444  Zyxel Employee
    First Anniversary 10 Comments Friend Collector First Answer
    Hi @qfabio,
    Welcome to Zyxel community. :)
    Not sure if it is IP subnet overlap on USG20WVPN. The USG20W-VPN Lan2 interface IP is 192.168.2.X/24 by default. if your wan interface IP/Subnet is 192.168.2.X/24. you need to modify Lan 2 IP to other subnet to avoid subnet overlap.
  • qfabio
    qfabio Posts: 3  Freshman Member
    Hi,
    thanks for your answer.
    You are right... Here the configuration:

    interface lan1
     ip address 192.168.1.1 255.255.255.0
     type internal
     upstream 1048576
     downstream 1048576
     mtu 1500
    !
    interface lan2
     ip address 192.168.2.1 255.255.255.0
     ip dhcp-pool LAN2_POOL
     type internal
     shutdown
    !
    interface dmz
     ip address 192.168.0.1 255.255.255.0
     type internal
     upstream 1048576
     downstream 1048576
     mtu 1500


    I'll modify the configuration but the lan2 is disabled:



    I cannot understand why all works fine and sometime it fails. In any case even if the configuration is not properly, why the fw reboots?

    In attach my configuration.

    Thanks a lot
  • qfabio
    qfabio Posts: 3  Freshman Member
    today I disabled firewall function and I didn't facing any disconnection.
    Could be an hardware issue? Thanks

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