Torandi's questions

I have a Broadcom BCM5352 router running DD-WRT firmware and four external IPs. In my network config at home I have first a router, and then a switch connected to the router (to avoid multiple cables through the whole appartment.

A server is connected to the switch, and if possible, I would like to give that server a different external ip (that is, tell the router to route all traffic to the specified external ip to the server and vice versa). I don't have static IPs, my ISP only offers DHCP.

So is there anyway to configure this? The firmware supports iptables, so if it can be done with iptables, then that is a solution. It is possible to do with pf, where the feature is called bidirectional nat mapping (1:1 mapping).

I'm looking for a practical way to backup data from a server and keep all ACLs and permissions. I've looked at tar, but according to Google tar doesn't keep ACLs . I know rsync can keep ACLs and permissions, but only if the target system supports POSIX ACLs and have the same users. In my case I'm doing the backup to a directory that is located on AFS, so POSIX ACLs are not supported.

At the moment I have solved the problem by writing a script that uses find to recurse through the system (I'm using find because I which to exclude some directories) and saves the permissions and ACLs to a text file. This solution works, but is painfully slow. Is there a better solution?