So I've been having a heck of a time figuring out how to setup interfaces on the UTM and perhaps conceptually I’m missing something.
From what I've been told, do not setup a Gateway IP on a Static Ethernet interface unless you want the UTM to be the gateway for that subnet? (Was told this by a Sophos trainer). The problem is if I do that I can not access the UTM from other subnets unless if I’m on the same subnet.
Example of things I’ve tried:
When setting up the “Management” interface, I’ve tried the following:
1) 10.1.1.254 255.255.255.255 (No Gateway)
2) 10.1.1.254 255.255.255.0 (No Gateway)
3) 10.1.1.254 255.255.255.0 GW: 192.168.15.1
With Option 1 and 2, I can only ping and access the UTM if I’m on a workstation on the SAME subnet. Only option 3 allows me to get to the UTM management interface from outside of the subnet. I think this is wrong as if I set it up with a Gateway and if I have other interfaces with gateways then Uplink balancing is forced on.
What's weird is my router can see the IP in the arp tables and shows up in the Cisco router the UTM is connected to as shown below:
abc-router#sho ip arp 10.1.1.254
Protocol Address Age (min) Hardware Addr Type Interface
Internet 10.1.1.254 0 abcd.abcd.85d9 ARPA Vlan400
abc-router #sho ip route 10.1.1.254
Routing entry for 10.1.1.0/24
Known via "connected", distance 0, metric 0 (connected, via interface)
Routing Descriptor Blocks:
* directly connected, via Vlan400
Route metric is 0, traffic share count is 1
So from everything I can see, it should work without a gateway. Again conceptually I must be missing something. Attached is a high level pic of my network for reference.
Any suggestions welcomed. Thanks!
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