We have a lan with subnet as 10.101.0.0/23 - i.e 10.101.0.1 - 10.101.1.254 usable host ip are available.
Lan is connected to firewall and to our WAN network
Now that lan users are increasing everyday and we may run out of IP address.
Solution to the above is to add one more IP subnet or remodify existing subnets mask to fit more hosts i.e /23 to be converted to /22 for 10.101.0.0 subnet.
but since we are already using 10.101.3.0 network somewhere else we cant use this option.
Hence we are left with the option of alternate network only.
Problem here is on the firewall we are not having additional network interface card.
How will we route the newly added network on my WAN.
As we dont have any layer 3 switch where we can do the intervlan routing and then route the default traffic to firewall.
what will be the best option to accomodate the new subnet with layer-2 switch and firewall enroute WAN.
Note:- Firewall has only one WAN and one LAN interface already used.
Also no Layer 3 Switch in Place
Pls suggest best option