Hello list, I am currently tinkering with a system that has two network interfaces which are both configured by the remote peer (DHCP and PPP). Now, I am facing the scenario that I might be assigned the same private network on both interfaces. I would like to transparently map the ip adresses of incoming packets on one interface to a different private network. That is, for applications, it should look like the interface has been assigned to this different private network. Example nif0 (nif = network interface) IP 192.168.1.145 Gateway 192.168.1.1 DNS1 192.168.1.2 DNS2 192.168.1.3 nif1 (before mapping) IP 192.168.1.203 Gateway 192.168.1.3 DNS1 192.168.1.3 DNS2 192.168.1.54 nif1 (after mapping to 10.0.0.0/8) IP 10.168.1.203 Gateway 10.168.1.3 DNS1 10.168.1.3 DNS2 10.168.1.54 In essence, I would like to provide a network address and a subnet mask and have the corresponding parts of all ip addresses on a certain interface mapped. Such that 192.168.1.3 is mapped to 10.168.1.3 iff the packet is received via nif1. Since this is a purely static operation, I guess it cannot be that difficult. My first approach was to use NAT but that does not seem to do the trick. After a lot more googling, I give up. Am I looking at the wrong places? Do I have to use MANGLE or RAW on PREROUTING and POSTROUTING? I would write a script that is called whenever on link is configured by the remote peer. So I am able to change rules whenever there is a collision. I can hardly believe to be the first to ask this question but I am unable to find a solution anyway :/ Kind regards, tannador -- Sent from my smartphone. Pardon typos and the short form. -- To unsubscribe from this list: send the line "unsubscribe netfilter" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
