changing subnet masks

Computing.Net > Forums > Networking > changing subnet masks

Original Message

Name: LPUSER
Date: July 5, 2002 at 03:12:09 Pacific
Subject: changing subnet masks

Comment:

I want to change the subnet mask on my NT4 LAN from 255.0.0.0 to 255.255.255.0.
Is this simply done by changing this on the PDC? (we are using DHCP). Are there any complications?
Thanks

Report Offensive Message For Removal

Response Number 1

Name: CJ
Date: July 5, 2002 at 03:39:53 Pacific
Subject: changing subnet masks

Reply: (edit)

Is there a reason you want to change it? i believe in the "If it ain't broke, don't fix it" theory.
usually it's not a problem (just time consuming) if you have less than 254 systems on the LAN. also make sure your servers and anything with a static IP are configured with the correct IP and SubNet(servers, network printers, etc.)
remember, with a 24bit SubNet the first 3 octets are the Network number and the last 1 is the computer (ie. 192.168.1.x/24, 192.168.1 is the network number and x is the computer, /24 is the number of used bits in the subnet mask 255.255.255.0) so the first 3 octets need to be the same for all systems.
don't forget to change the DHCP scope and options as well.

Report Offensive Follow Up For Removal

Response Number 2

Name: adam gniel
Date: July 5, 2002 at 03:40:58 Pacific
Subject: changing subnet masks

Reply: (edit)

The subnet mask is used simply to divide an ip address into network and host portions. By changing it, we will be creating more networks, but with smaller numbers of hosts in each than previously.
In anwser to your question. No there shouldn't be a problem

Report Offensive Follow Up For Removal

Response Number 3

Name: Curt R
Date: July 5, 2002 at 06:24:40 Pacific
Subject: changing subnet masks

Reply: (edit)

One thing to keep in mind...all statically assigned computers in the network will require manual changing of the subnet mask.
Just change it once on your DHCP Server (well ok twice, once in the server's TCP/IP properties itself and once in the DHCP setup) and that will affect all DHCP clients.

Report Offensive Follow Up For Removal


Change Subnet Mask-Dialup Connect? accidently changed subnet mask, can how to manually chang subnet mask Subnet Mask or DHCP problem Subnetting mask getting changed	Subnet Mask Address Changes Monthly Change Subnet to transfer files? Subnet mask and IP range subnet mask 255.255.0.0 Problems with IP/Subnet mask

network printer sharing

wan users

Use following form to reply to current message:

Name: From My Computing.Net Settings E-Mail: From My Computing.Net Settings Subject: changing subnet masks

Comments:

  Homepage URL (*): 
Homepage Title (*): 
         Image URL:

Help cannot access the internet

Can I Retrieve my lost files?

Installing New HDD on Dell Laptop

XP Service Pack 3 - Valid?

New burning software... problems

All Posts Awaiting Replies