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RED15 is online but no ping and internet

Jiri Skryja

Hello, we have Sophos UTM and Sophos RED15 on remote site. Last days I am facting  trouble that when RED15 is turned off and started again it is connected to our UTM but can't ping on RED site and they are not able to reach the internet. We are Using Standard / Unified Mode. I set it up according to this tutorial Sophos UTM: Putting clients on RED and LAN onto same network. It was working for a few month allright, I don't know what is happening now.



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  • FormerMember
    0 FormerMember

    Hi ,

    Thank you for reaching out to Sophos Community.

    Are clients located behind RED being assigned with DHCP IP from UTM?

    You can check the leased IP from Network Services > DHCP > IPv4 Lease Table.

    If yes, then please follow the steps below to check the packet flow.

    ==> Login to SSH and run the below command

    utm:/root # tcpdump -nei any host 1.1.1.1 and proto ICMP

    ==> Start a ping to 1.1.1.1 from the client located behind RED.

    ==> Share the session output here or in PM.

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  • FormerMember
    0 FormerMember

    Hi ,

    Thank you for reaching out to Sophos Community.

    Are clients located behind RED being assigned with DHCP IP from UTM?

    You can check the leased IP from Network Services > DHCP > IPv4 Lease Table.

    If yes, then please follow the steps below to check the packet flow.

    ==> Login to SSH and run the below command

    utm:/root # tcpdump -nei any host 1.1.1.1 and proto ICMP

    ==> Start a ping to 1.1.1.1 from the client located behind RED.

    ==> Share the session output here or in PM.

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