Extending IP Range

[Grommit]

I sure this has been discussed before.. but..

I nned to extend my range..

192.168.0.1 192.168.3.254

255.255.255.252

Is my configuration.. we only have 18% free of the DHCP scope and I am getting 90 more PC's soon

As you know we have fixed IP's for Servers, Printers, WAPs and some other stuff...

Is there any way to simply extend this range :-)

[ChrisH]

Are you sure that subnet mask is correct ? do you mean 255.255.252.0?

[plexer]

If not then you definatelt need more ip addresses

Ben

[wesleyw]

Should be easy enough to just change the scope on your DHCP excluding the addresses used statically and just change the subnet mask to 255.255.248.0 ? 192.168.0.1 - 192.168.7.254 ?






Wes

[Grommit]

Are you sure that subnet mask is correct ? do you mean 255.255.252.0?

yes... sorry that should be 255.255.252.0

Should be easy enough to just change the scope on your DHCP excluding the addresses used statically and just change the subnet mask to 255.255.248.0 ? 192.168.0.1 - 192.168.7.254 ?

Would I not have to change the static SN Masks to .248 on the servers, Printers and WAPS manualy ? as this is what I am trying to avoid :-)

[plexer]

Unfotunately for you to achieve this you will have to change any statically configured devices manually.

Ben

[Stese]

I agree with Plexer... you;d have to do it, otherwise you'll get clients not being able to talk to each other...

one way around this problem in the future is to set your static systems on to DHCP and set reservations for them using their MAC address. You can then change your DHCP settings to show the new Subnet mask, and it will affect all your systems. It's a pain in the backside if you have loads of static clients, but worth it later...

Regards,

Stese

[Lord_Edam]

would you need to change the static devices though?

On a properly configured network, if you try to talk to any device on a different subnet your packets are sent via the default gateway

so the "old" (static) devices will just send anything for the "new" (extended dhcp) devices via the default gateway. Everything can still talk to everything else, provided your default gateway is configured correctly.

or is friday afternoon addling my mind (which it must be - that took too attempts to type!)?

[Geoff]

no because the netmasks are different. So you get:

Old device -> gateway -> New device

Which works, but then the new device tries to reply:

New device -> old device

old device throws packets away because they didn't come from the gateway

[Grommit]

I agree with Plexer... you;d have to do it, otherwise you'll get clients not being able to talk to each other...

one way around this problem in the future is to set your static systems on to DHCP and set reservations for them using their MAC address. You can then change your DHCP settings to show the new Subnet mask, and it will affect all your systems. It's a pain in the backside if you have loads of static clients, but worth it later...

Regards,

Stese

*sigh*.... I thought so..... so now how do I find all the fixed IP's :-(

[Grommit]

I agree with Plexer... you;d have to do it, otherwise you'll get clients not being able to talk to each other...

one way around this problem in the future is to set your static systems on to DHCP and set reservations for them using their MAC address. You can then change your DHCP settings to show the new Subnet mask, and it will affect all your systems. It's a pain in the backside if you have loads of static clients, but worth it later...

Regards,

Stese

*sigh*.... I thought so..... so now how do I find all the fixed IP's :-(

[plexer]

You look them up in your spreadsheet/system to see what they are or you just start at the first excluded ip and try to telnet/ssh/web browse to them to change them.

Ben

[NetworkGeezer]

I think the WAPs will be the only really problem if you have a big wifi coverage. Other network appliances could be left alone intially as they will only be contected by servers.