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Sophos XG - external router and internal network on same subnet?

I am upgrading the Sophos UTM to XG. The router is externally managed and sits on 10.10.10.253/8. The Sophos UTM was on IP address 10.10.10.80 and the internal network uses the 10.10.10.0/8 range. I don't have time to reconfigure the internal network and am unable to contact the Router support company until next week. Is there a way to configure the XG as above? With internal IP 10.10.10.80/8 and external IP 10.10.10.252/8?

This is in a school environment and I need to configure all of the Web Filtering, we also have 20 Sophos Wireless Ads controlled by the UTM/XG.

Thanks for your help.

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0 lferrara over 8 years ago

Mike,

how is the UTM now configured?

You could use a Bridge configuration. If your internal computers are using the extranl router as their default gateway, go for the bridge configuration.

If you can, plese share a network diagram.

Regards,
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0 MikeTaylor over 8 years ago in reply to lferrara

Thanks Luk,

The Sophos box is the default Gateway for all devices (may be wrong but hat's the configuration I inherited!

I will try and share a basic diagram.FHSNetworkDiagram.pdf
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0 lferrara over 8 years ago in reply to MikeTaylor

Mike,

you should not use the same Network/Mask on 2 different NICs even on UTM.

This will make confusion on routing table.

Check and share how it was working on UTM9.

Thanks
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0 MikeTaylor over 8 years ago in reply to lferrara

Thanks Luk,

The UTM 9 was setup as per the diagram I posted previously. I have set it up in Bridged mode and am now trying to get my head around the settings - do you know if there is a configuration guide available to download?
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0 lferrara over 8 years ago in reply to MikeTaylor

Mike,

here the official Sophos KB on how to create the bridge:

https://community.sophos.com/kb/en-us/123098

The process is really straightforward.

Make sure to create proper firewall rules.

Regards,
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