Networks

Ask something
Discussion Locked

adding dhcp addresses

0 helpful
5 replies

by nick

Closed to new repliesThis discussion is closed. It stays readable, but it takes no new replies.

I've inherited a small network with 60 users in a very quickly growing company. Their internal IP scheme is 208.235.195.0 with a subnet mask of 255.255.255.128. I know the scheme uses public IP's, it's a long story about getting cut off from their former ISP where everyone had public IP's, and they added a router to do IP forwarding, so the IP's are assigned by a DHCP server. with all the printers and new users, there are few IP's left.

I need to add more capacity and need recommendations asto how to do this. changing the whole scheme would be ideal but it not practical in terms of time and manpower (ie, me), any suggestions?

5 replies

by jason.barnett

Nick,

If you are connected to the internet via a router and use network address translation, then your internal IP addressing scheme is somewhat irelevant in terms of which subnet you use. I would suggest that you use a RFC1918 subnet such as 192.168.0.x with a 255.255.255.0 subnet mask. This will give you 254 IP Addresses to allocate.

Now in terms of the manpower to do this, you say that you use a DHCP server therefore you should have very few statically configured IP Addresses. So, when everyone has gone home one night modify the scope on your DHCP server, manually change the devices with static addresses (really the only static addresses you want are the DHCP server and the router, all other servers should have a reserved address so they always get the same IP address, e-mail me for me explanation of reserving addresses).

Then when everyone rocks up for work next AM, their machines will receive an address in the new scheme and will be able to talk to all other devices both static and DHCP'd because of the changes you've made.

Sorted. Half an hours work tops.

Regards,

JB.

by mikewbc

I agree with jason except for I like to keep my routers,printers and all servers with a fixed address. I just assign them and them remove them from the scope of the DHCP server. It can help in the long run to prevent problems with working with network printers.

This discussion is closed to new replies.