Using an external IP without NAT

[Lum_UK]

My ISP gives me 3 usable IP addresses, one is the IP of the router, and the other two are in a separate block, a /29 so two usable.

Currently I have the router set up to just use the one IP and to do NAT. Behind this I have my Windows machines.

However I also have a Linux machine that I would like to connect directly to the internet. I would like to give it one of my external IPs and plug it directly into the Billion on port #4, then have the Billion route packets to it without any form of NAT being involved.

I can't figure out how to set this up. I tried creating a port-based VLAN for port #4. If I ssh into the router this vlan shows up as an interface called br1. However if I then go back to the static routes section of the web interface, I can't set up a rule to forward to br1 as the only interfaces in the dropdown are my adsl interface and the main br0 interface.

Any ideas how I'd do this?

[billion_fan]

PM me your email address, I have a guide that might help, the guide was written on older firmware.

Thanks

[billion_fan]

email sent

[Lum_UK]

Thank you, those instructions make sense, disable NAT, then enable it again through the command line.

Annoying that you can't do it through the web interface and that they don't get saved, however. I take it you can't edit /etc/rc.local on this router or anything like that?

[ahilborne2]

Any chance that you could post the guide here, please?

Though I suspect that the ethernet ports cannot be given different IP addresses, nor VLANS, so the best we can do is assign IP aliases on the WAN and the LAN and do some static routing, maybe with some firewall rules as well.

[billion_fan]

Any chance that you could post the guide here, please?

Though I suspect that the ethernet ports cannot be given different IP addresses, nor VLANS, so the best we can do is assign IP aliases on the WAN and the LAN and do some static routing, maybe with some firewall rules as well.

Attached