LAN/WAN subnet overlap - how enable proxy ARP

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

SuperUser

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)

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