Hi, Sounds to me like you don't actually need to do anything - just enable IP forwarding on the linux machine (the gateway - usually something like echo 1 > /proc/sys/net/ipv4/ip_forward), and point your 202.172.122.7x machines at 202.172.122.74 for their default gateway (which your DHCP server should be passing out as a dhcp option anyway). Unless I have missed something in the question? Dan -----Original Message----- From: lartc-bounces@xxxxxxxxxxxxxxx [mailto:lartc-bounces@xxxxxxxxxxxxxxx] On Behalf Of Tim Groeneveld Sent: 15 October 2007 13:15 To: lartc@xxxxxxxxxxxxxxx Subject: Re: Routing public IP's through a gateway On Sunday 14 October 2007 11:07:10 pm Tim Groeneveld wrote: > Greeting all, > > I have a bit of a complicated question. > > I have two ethernet devices, eth1 and eth2. > > eth1 is where my internet comes from. It is in the form of > 202.172.122.208/29. It has another IP range, 202.172.122.72/29. What I > want to be able to do is route 202.172.122.72/29 to eth2, so that > other machines can use those IPs, any ideas on how to do this, I > cannot work out how to do this. > > eth2 has a DHCP server, which only gives out IPs 202.172.122.74 to > 202.172.122.76. > > eth1 is basically just hooked into my internet router, while eth2 is > hooked into a switch, and will be used for other computers. > > If anyone could help me with this setup, I would more then appreciate it. > > Thank you very much, > > - Tim Groeneveld > To extend what I have tried to say further: My ISP has given me two IP ranges. 202.172.122.208/29 and 202.172.122.72/29. They are unable to give me any larger IP ranges for some lame excuse, which I am sure was written by the BOfH. Does your isp route 202.172.122.72/29 to me? Why yes it does. It routes this IP through the gateway 202.172.122.209. If I want to give a machine an IP in 202.172.122.72/29, this is what I need > A machine already in the 202.172.122.208/29 IP range. > ip route add 202.172.122.72/29 via 202.172.122.209 dev eth1 > ifconfig eth1 202.172.122.73 netmask 255.255.255.248 (where on this machine, eth1 is hooked into my router). What I would like, is a gateway machine, which will use eth2 to provide a gateway for other machines to assign themselves .72/29 IP's, *without* the need of 202.172.122.209 being in the route table. So, there would be *one* gateway machine. This gateway machine has (already) an IP on both ranges. > 202.172.122.211 (eth1) > 202.172.122.74 (eth2) eth2 would then be connected into a switch, and eth1 into the internet router. I am not sure if this helps at all, sorry if it does not. Thanks again, - Tim G _______________________________________________ LARTC mailing list LARTC@xxxxxxxxxxxxxxx http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc
