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XG Firewall using incorrect IP address

Paul Jones2

Hi Guys, I'm a bit of a Sophos XG Noob so please bare with me.

Sophos XG - 310 (SFOS 17.5.9 MR-9)

We are having an issue with our systems authenticating around our Sophos Box, authentication is failing due to traffic not going where it should.  What we have noticed is that our Sophos WAN port(Port 2): IPv4 10.172.65.30 /28 has also been using 10.172.65.29(which belongs to our Cisco Switch Port, Static Address) and registered the IP against the Sophos Port2 MAC address.  We only found this out by looking at the logs on our Cisco switch that the Sophos box is plugged into, the logs show this as a conflicting address.

Has anyone seen this happen before?  Any ideas how to rectify this issue.  Both the Cisco and Sophos box haven't been touched in the last few weeks, this error happened this morning for the first time.

 

Cheers,

Paul.  



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  • 0 in reply to Paul Jones2

    Paul,

    can you share a screenshot?

    Again, the XG is learning the mac-addresses from the network where it is attached. It is not an XG issue but another device on the network has that IP address.

    Check the mac-address that is linked to the IP address that is causing the conflict and check via show mac-addresses on cisco where the host with that mac-address is attached.

    Regards

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