Geek help: static IP addresses

[ciphergoth]

Quick geek help sought with making sure I understand IP routing properly.

Zen have allocated me the static IP address block 82.68.129.72/29. Of these eight addresses, one is the network address, one is the broadcast address.

I've fitted an ADSL card to my main PC, saltationism. So it has two interfaces: an ADSL interface and a LAN one. That's two more addresses taken. So there are four left: I can give up to four more machines on the LAN static IP addresses.

The thing that worries me is that if the subnet for the LAN is 82.68.129.72/29, then can I assign an address from that subnet to the ADSL card? If I do, will my LAN be able to route to that address? If not, what should I do instead?

Comments

[drreagan.livejournal.com]

Simple solution: have the other machines on the network send their routes to the PC's ethernet cards IP address as their gateway/router.
There's no reason why they would need to talk directly to the IP address of the ADSL card.

Another solution is to set up some sort of bridging between the ADSL card and the Ethernet card. If your ADSL interface is working via PPP of some sort, adding the word "proxyarp" to the PPP options file will make this work. If it's acting like an ethernet card of some sort, then it'll be more difficult.

[drreagan.livejournal.com]

Sometimes it's also possible to give two interfaces on the machine the same ip address, assuming that one of them is a point-to-point link.