Randomly connection issue

qfabio

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

Zyxel_Cooldia

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

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

today I disabled firewall function and I didn't facing any disconnection.
Could be an hardware issue? Thanks