Comments on: IP Addressing

By: jester42

jester42 — Sat, 25 Dec 2004 20:36:54 +0000

check out learntosubnet.com for help

By: mable44

mable44 — Tue, 16 Nov 2004 09:02:24 +0000

In order for computers/servers to correctly see each other over the network they would need to be on the same subnet mask. If you begin changing the subnet mask on some, not all, those on the subnet 255.255.255.0 will communicate with each, and those 255.255.255.128 will communicate. You could use a route command to interface the 2, but if there are manageable number of computers to techs I suggest changing to the IP addresses scheme you prefer at one time.

By: mrwizard

mrwizard — Tue, 16 Nov 2004 08:10:22 +0000

What a coincidence.
Just had this happen to a client a few weeks ago.

Here’s what I did…
Early in the week set DHCP lease time to 1 day.
After-hours on Friday I changed the subnet mask on the DHCP and all static IP devices.
On Monday morning everything was working fine, DHCP renewed all leases with new subnet.

By: marchullegie

marchullegie — Tue, 16 Nov 2004 07:39:56 +0000

I Agree with Nandan: leave the old range (and mask) unchanged. Start a new range (and mask) and add a route-entry for that range in all routing tables which are on the path. Start that with the DHCP scope (after you added the routing entry) will give you time to change the static entries one-by-one.
Only adjusting the mask will most likely cause communication problems since the route is not changed.
(an open door: when you are working in a team, communicate your planned change to prevent anyone still acting the old way).