I have a primary LAN subnet of 192.168.0.x. We are running out of IPs. I added and use 10.10.0.0/24. It works but I have concerns. Here is how I set it up.
1. I have a SonicWall Pro 3060. The LAN port is my gateway (192.168.0.250). I created an object 10.10.0.0/24.
2. Created a static ARP entry of 10.10.0.1 for the gateway which points to the same LAN interface on the SonicWall.
3. Allowed all traffic outbound from that subnet. Inbound abides by existing rules.
4. On my DHCP server I already had 192.168.0.0/24 so I created the 10.10.0.0/24 subnet then created a Superscope. Added both of them to the super scope.
5. Because I wanted to use Static DHCP I added the full range 10.10.0.0/24 then excluded 10.10.0.1, 10.10.0.3-10.10.0.254. Then reserved 10.10.0.2 using the MAC address of one of the PCs so everytime it connected to the LAN it gets that address.
I am wondering if I can do away with the Static ARP entry on the SonicWall and do all work on the DHCP server regarding the gateway. I did go into the scope options and change the router address from 10.10.22.1 to 192.168.0.250 and it seems to work but I still wonder if I am missing somthing or if there will be negative consequences later.
What do you all think about this setup?