The ISP probably intended for the ADSL router to have two public IP
WAN = 184.108.40.206, LAN = 220.127.116.11
WAN = 18.104.22.168
LAN = (some private IP, such as 192.168.1.1)
(You can then use static NATs and Proxy ARPs to use the remaining IPs)
Andrews and Arnold give out allocations like this - it make it very easy to
give the m0n0wall a public IP address without setting up bridging etc on the
----- Original Message -----
From: "Chris Bagnall" <chris at minotaur dot it>
To: <m0n0wall at lists dot m0n0 dot ch>
Sent: Thursday, June 01, 2006 3:34 PM
Subject: [m0n0wall] ADSL subnet routing where gateway is outside the subnet
> Greetings all,
> I've come across an unusual address range provided by an ISP today and I
> wonder if someone might be able to shed some light on the best way to
> configure it.
> Normally, when I've set up ADSL in the UK with a routed subnet the gateway
> tends to be inside that subnet, for example:
> Subnet: 22.214.171.124/29
> In this case, the ISP might assign the ADSL modem .1, then I'd put m0n0 on
> .2 (with a gateway of .1), then any PCs that need static IPs get them
> 1:1 NAT. I've set up plenty of m0n0s like this and never had a problem.
> The ISP I've been dealing with today has given the following ranges:
> Fixed WAN IP: 126.96.36.199
> Routed IP Subnet: 188.8.131.52/29
> The ADSL modem gets 184.108.40.206 via DHCP, all well and good. For m0n0
> configuration, is it simply a matter of picking an IP from the .192 subnet
> and using the .128 address as the gateway?
> Would one need to change any settings on the ADSL modem to ensure it
> forwards the subnet correctly? Should the ADSL modem (which is essentially
> router as well) have an address inside the subnet on its LAN side?
> Any hints gratefully appreciated.
> C.M. Bagnall, Director, Minotaur I.T. Limited
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