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RED 15 on the same subnet as UTM internal network?

LukaszDziewa

Hi,

I'm trying to setup a RED 15 at a remote location, which should connect to our main office network behind a Sophos UTM 9.5. I followed the instructions here https://community.sophos.com/kb/en-us/116573 to setup a Standard/Unified tunnel and it mostly works. The problem I have is with our Alcatel-Lucent PBX, which will not communicate outside of it's subnet. Since the RED and it's clients are in a different subnet (as per instructions) than our internal network, the PBX will not respond to any request from these PCs or phones. Unfortunatly I can't change anything in the PBX, so I have to figure out how to configure RED/UTM get this to work.

I tried using the DHCP-Relay function (to internal Windows Server), which only works if RED has an IP within our main subnet. I'm able to get IP addresses for client behind the RED, but can't communicate at all. Can't even ping the DHCP Server which issued the IP. The FW rules were left as in the instructions (RED->Any->Any).

I have not tried bridging RED with our internal network as that's seems to be a pretty big deal and could cause too much downtime. I'd have to nuke our "Internal" interface, setup the bridge and then recreate/reapply all our FW/NAT/Masquerading/VPN etc. rules and settings, unless there is a better way?

Any ideas how I can get clients behind RED on the same subnet, or at least "appear to be" on the same subnet as our main network?

Thanks



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