Help with IP address subnet conundrum!

Philbert

Hi folks,

I’m hoping you might be able to help me with a small issue which is stretching my limited knowledge on IP addressing.

I need to access a Terminal Server using an O2 iPhone. The TS is running a Two Factor Authentication software which isn’t compatible with the iPhone. I am however able to whitelist IP addresses within the Two Factor Authentication software which will allow the iPhone to bypass the 2FA and authenticate and access with the server without any problems.

The issue is that the iPhones IP address is changing constantly. The software will allow me to enter a 'Subnet and Netmask' to whitelist an entire subnet which is great if the iPhone remained on the same subnet but that appears to be changing also.

For example; One minute it is 10.36.17.154 the next it could be 10.36.1.26. The only consistency is the [10.36.]

So my question is; Is it possible to specify a single Subnet and Netmask that will take into account all of the IP address possibilities after [10.36.] i.e; 10.36.*.* ??

I know with a single subnet you can specify 10.36.1.0 / 255.255.255.0 but I am not sure how to go about the above.

Cheers..

rmacm

Philbert wrote: »

Hi folks,

So my question is; Is it possible to specify a single Subnet and Netmask that will take into account all of the IP address possibilities after [10.36.] i.e; 10.36.*.* ??

I know with a single subnet you can specify 10.36.1.0 / 255.255.255.0 but I am not sure how to go about the above.

Cheers..

10.36.0.0/16 or 10.36.0.0/255.255.0.0 in other words...eh numbers.

That will cover everything from 10.36.0.0 to 10.36.255.255

Philbert

rmacm wrote: »

10.36.0.0/16 or 10.36.0.0/255.255.0.0 in other words...eh numbers.

That will cover everything from 10.36.0.0 to 10.36.255.255

Cheers Rory.

BaconZombie

Or it could be 10.36.0.0/255.255.252.0

rmacm wrote: »

10.36.0.0/16 or 10.36.0.0/255.255.0.0 in other words...eh numbers.

That will cover everything from 10.36.0.0 to 10.36.255.255

FruitLover

BOFH_139 wrote: »

Or it could be 10.36.0.0/255.255.252.0

That will only cover 10.36.0.0-10.36.3.255, it won't reach as far as 10.36.17.x

Naikon

FruitLover wrote: »

That will only cover 10.36.0.0-10.36.3.255, it won't reach as far as 10.36.17.x

A /30 will give him 2 device addresses to play with. Should be more than enough.

The range will then be 10.36.0.0-10.36.0.3
Address space conservation people:eek:

If you don't want routing involved, just assign
a netmask of 255.255.0.0 if you want the host
portion to be the last two octets.

Naikon

Naikon wrote: »

A /30 will give him 2 device addresses to play with. Should be more than enough.

The range will then be 10.36.0.0-10.36.0.3
Address space conservation people:eek:

If you don't want routing involved, just assign
a netmask of 255.255.0.0 if you want the host
portion to be the last two octets.

Feck, just realised I read the mask as 255.255.255.252
when BOFH_139 mentioned 255.255.252.0

Damn insomnia keeping me up : (

accensi0n

Naikon wrote: »

A /30 will give him 2 device addresses to play with. Should be more than enough.

The range will then be 10.36.0.0-10.36.0.3
Address space conservation people:eek:

If you don't want routing involved, just assign
a netmask of 255.255.0.0 if you want the host
portion to be the last two octets.

He wants to allow the entire 10.36.x.x subnet.

Naikon

accensi0n wrote: »

He wants to allow the entire 10.36.x.x subnet.

I know that now, hence the thanks to rmacm.
Best response so far.