Setting up a new IP range in a LAN

[rob4465]

I wonder if anyone can give me any advice on this:

We currently have a bt voyager adsl router with an ip of 193.122.31.129 and a subnet of 255.255.255.224. This gives us a range of 30 ips - 28 usable ones.

Recently BT have given us an extra 10 ips and told us to add the ip 193.123.80.193 and subnet mask 255.255.255.240 to our voyager router.

Our network consists of about 26 pcs which all use 193.122.31.129 as their gateway and 255.255.255.224 as their subnet.

So my question is what would be the best way to add these new ips into our current network. I notice that the bt voyager has a secondary IP/subnet mask option. Is this something I should be using to allocate the new ip range?

Any advice would be appreciated.

Thanks for your help

 

[manarth]

I've not used that model before, but I'd guess simply add those details to the secondary IP. It'll be slightly less efficient, because your LAN will be split into 2 subnets, and the BT router will have to route between the two.

Any particular reason why each PC needs a public IP address? This looks like a prime target for using NAT.

<marc> i wonder what will happen if i press this...[ul][li]please tell us if our suggestion has helped[/li][li]need some help? faq581-3339[/li][/ul]

 

[rpaverd]

Strongly recommend NAT.

 

[rcraig12]

NAT will help protect your network. Its a must on public network fringes.