Networking Issue

pablo21

Help needed. I've a network setup with 30 machines/switchs/accesspoints/dvr etc. IP range is from 192.168.1.1 to 192.168.1.30 with a subnet of 255.255.255.224. Problem at the moment is that I cant assign an IP address beyond .30?? By that I mean I can assign it but it wont see/be seen by the other machines. I know I'm missing something basic here but all help greatly appreciated.
P.

bushy...

You've answered your own question really , here's a simplified explanation ...
a subnet of 255.255.255.224 ( or /27 )
starting at 192.168.1.1 goes to 192.168.1.30 ( 192.168.1.31 is your broadcast address for that range )

if you use a subnet of 255.255.255.0 ( or /24 )
it will go from 192.168.1.1 to 192.168.1.254 ( .255 will be your broadcast )

Did you just pick 255.255.255.224 or is there a reason you're using it ( important this )

pablo21

Not sure why that subnet was used, it's been copied over from the first pc I guess, So if I change the subnet to end in 0 my problem will be solved then??

bushy...

Grand , if they're not part of a bigger network , change it to end in 0 on all the gear and it should work away.

pablo21

Thanks, and lets say the network was going to be bigger than 254 machines, what would that involve?

ntlbell

pablo21 wrote:

Thanks, and lets say the network was going to be bigger than 254 machines, what would that involve?

A router and another netblock.

e.g. 192.168.2.0/255.255.255.0

pablo21

Thx for all your help folks!

Foxwood

pablo21 wrote:

Thanks, and lets say the network was going to be bigger than 254 machines, what would that involve?

You could set the netmask to 255.255.254.0 and use 192.168.1.x and 192.168.2.x (or other blocks of consecutive addresses). This will allow you to have 500+ IP addresses on a single logical network, without a router.

Google for "supernetting".

pablo21

Changed the mask to 255.255.255.0 on all machines today and everything seems to be working fine! Thanks for all your help!

axer

pablo21 wrote:

Thanks, and lets say the network was going to be bigger than 254 machines, what would that involve?

You could just then change to a class B network address range using the 172.16.0.0 to 172.31.255.255 ip address range (1,048,576 IP addresses).

po0k

Or perform auto-orthodontistry.

bushy...

Go mad altogether and use 10.0.0.0/8 but you will incur higher end of year ip tax