Multiple subnets on same LAN

 the easiest method to increase the number of hosts on a network would be to change the subnet mask of your existing network to accomodate more hosts eg /16 instead of /24. But this involves ip address planning . if you plan your ip scheme right then you wouldnt need superscope to increase the complexity/load  of your dc.

Thank you for your response.  I have several VPN setup that include vpn that would be within this scope such as 192.168.2.0/24 and 192.168.3.0/24.  If I changed the subnet mask to /16 would that cause issues with the site to site VPNs?

from your post i understand

your existing network is 192.168.0.0 /24

You want to increase the number of hosts on the network

You also have site to site connectivity ( IPSEC VPN) from 192.168.2.0 , 192.168.3.0 to your network 192.168.0.0

how is it currently setup for these site-to-site vpn now.

https://community.sophos.com/kb/en-us/123140

Hi you are correct they are setup using IPSEC VPN just as described in the KB.  So In the end I will have a network configuration like this:

192.168.0.0/24 Site 1 Primary subnet
192.168.1.0/24 Site 1 Secondary subnet (This is what I want to add)
192.168.2.0/24 Site 2 site 2 site ipsec vpn
192.168.3.0/24 site 3 site 2 site ipsec vpn
192.168.4.0/24 site 4 site 2 site ipsec vpn

Thank you.

You could also connect the "second" LAN to another Port on XG and then bridge those two LAN ports. You will have to add at least one firewall rule which allows traffic from both sides or you can create more specific rules.

You could also connect the "second" LAN to another Port on XG and then bridge those two LAN ports. You will have to add at least one firewall rule which allows traffic from both sides or you can create more specific rules.

Thank you.  If I wanted to do that would this network describe what you are suggesting?

Basically yes although some descriptions are missing so I can not give you further advise. But if you add the second subnet to the XG, bridge the two LAN ports and create a firewall rule allowing communication between the two subnets then XG will do all the routing and you can use both subnets like it is one.

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

Hi Jelle, thanks for your help.  I'm attempting do do what you suggested.  When assigned a lan port a static IP(Port4) and then bridge it to the primary lan port it only allows the bridge to have its own address and the settings I entered when it was unbridge ports are discarded.  Whats the correct method to bridge 2 lan ports while still maintaining the two subnets?  Thank you.