Subnet mask settings?

[Hikvision87]

Hi all

Slowly learning with networking and struggling to get my head around subnet masks. My router is defaulted to 192.168.1.64 - 192.168.1.253. Subnet is 255.255.255.0.

I want to change the above to 172.32.x.x. However it won’t allow it… it will allow 172.16.x.x

What am I doing wrong and missing?

Thank you.

 

[ahdinko]

Hi all

Slowly learning with networking and struggling to get my head around subnet masks. My router is defaulted to 192.168.1.64 - 192.168.1.253. Subnet is 255.255.255.0.

I want to change the above to 172.32.x.x. However it won’t allow it… it will allow 172.16.x.x

What am I doing wrong and missing?

Thank you.

The issue is likely that 172.32.x.x is not a private address space, the Class B private block is 172.16.0.0 to 172.31.255.255.

Subnet masks are a slightly different issue, they denote which parts of the address defines the network and which defines the host. X is the host address space, for example if you had a network of 172.16.1.x, you would have a subnet mask of 255.255.255.0
If you used a network of 172.16.x.x, you would have a subnet mask of 255.255.0.0.
The only real reason to use a subnet mask of 255.255.0.0 is if you want more than 253 devices in a single network.

 

[David]

Hi all

Slowly learning with networking and struggling to get my head around subnet masks. My router is defaulted to 192.168.1.64 - 192.168.1.253. Subnet is 255.255.255.0.

I want to change the above to 172.32.x.x. However it won’t allow it… it will allow 172.16.x.x

What am I doing wrong and missing?

Thank you.

as @ahdinko said, 172.32.x.x is outside the private IP address range. Your router is probably configured to block anything outside the private range. You should be able to use a public IP address on a router WAN interface, only use public IP addresses issued by your ISP.


David

 

[Hikvision87]

Thanks for the replies!