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WAN connection stops working/routing but interface still UP/UP. Have to disable and re-enable to allow traffic again

brimur

Firstly my UTM is up to date. Whether that is a good or a bad thing is uncertain :)

I have a cable modem in bridge mode with three connections to it. Each connection gets a public IP address from my ISP. One of these is the WAN connection on the UTM ( default GW 192.168.0.1). The other two go to my work VPN router and a wifi access point (using WAN port but no dhcp enabled). The Wireless AP is on the same subnet with an IP of 192.168.0.253

Very often the UTM will stop routing traffic to the internet for what appears to be no reason. The WAN interface says everything is ok and has an UP/UP status but if I try to ping 8.8.8.8 for example I just get a time out. If I change my gateway from the UTM (192.168.0.1) to the wifi router (192.168.0.253) on my PC my internet is restored telling me the cable modem connection is fine. Also, my work VPN router does not lose connection. So the issue appears to be only with the UTM. I changed the cable and even the NIC in case it was a physical issue but the issue remains. I wouldnt mind so much if it at least detected the issue because then it could just reset itself but it doesnt so I have to logon and disable/enable the WAN interface and internet is restored immediately.

Im curious if anyone else has experienced this and/or knows a solution?

Thanks



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    I have the same problem on a client.

    The traffic simply stops. There are no errors in the logs. All other interfaces are working, only the WAN interface presents the problem.

    I provisionally created a script that monitors the gateway, and if it does not respond, it deactivates the interface and activates again. Traffic returns to normal.

    I created another script that starts tcpdump and saves it to a file 50seconds of WAN interface traffic. In it I can see that the connections coming through the wan interface, I see the traffic going to the LAN, I see it returning, but I do not see it coming out through the WAN interface.

    I reinstalled sophos and it continues with the same problem.

    I'm waiting for some solution to the problem.

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  • 0

    I have the same problem on a client.

    The traffic simply stops. There are no errors in the logs. All other interfaces are working, only the WAN interface presents the problem.

    I provisionally created a script that monitors the gateway, and if it does not respond, it deactivates the interface and activates again. Traffic returns to normal.

    I created another script that starts tcpdump and saves it to a file 50seconds of WAN interface traffic. In it I can see that the connections coming through the wan interface, I see the traffic going to the LAN, I see it returning, but I do not see it coming out through the WAN interface.

    I reinstalled sophos and it continues with the same problem.

    I'm waiting for some solution to the problem.

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