LAN/WAN subnet overlap - how enable proxy ARP

[mhucm]

I have LAN/WAN subnet overlap (it cannot be avoided) and I need a help how to set up ARP proxy.

I've been running Linux router with that subnet overlap and ARP proxy for ages without any problem.

LAN: IP 1.1.1.1 MASK 255.255.255.0

WAN: IP 1.1.1.253 MASK 255.255.255.252, GW 1.1.1.254

[sw2090]

well yes you could avoid it if you use subnetting. Bascially it's still the same net then but technically its two different nets then.

E.G.: LAN: 1.1.1.0/29 (i.e MASK 255.255.255.248) would have:

   1.1.1.0 Network address

   1.1.1.1-6 Hosts/Clients/Gateway 

   1.1.1.7 Broadcast

The same goes for WAN. You could do bigger subnets if needed of course :)

You can find tables on the internet for subnetting.

This avoids overlap and you could make policies for each (or one for the complete net)