VPN Tunnel Internal T-Mobile

[chueymtz]

Quick question, we are going to build a vpn tunnel with t-mobile and they are asking for 2 internal /30 ip addresses private ip's. What are examples of this? I'm not really sure what to provide them.

[Richard Pidcock]

RFC 1918: Address Allocation for Private Internets (rfc-editor.org)....All you ever wanted to know about private addresses.

But a shorter answer will be as follows: 

Your private (internal) ranges are:

10.0.0.0 - 10.255.255.255 (10.0.0.0 /8)

172.16.0.0 - 172.31.255.255 (172.16.0.0 /12)

182.168.0.0 - 192.168.255.255 (192.168.0.0 /16)

Those are your private ranges, and specifically a /30 would have a subnet mask of 255.255.255.252.  So for example, you could use 10.0.0.0 /30 and your subnet would look like this:

Subnet Number:  10.0.0.0
Usable IP's:  10.0.0.1 - 2
Broadcast Address:  10.0.0.3

You could then move to the next range:

Subnet Number:  10.0.0.4
Usable IP's:  10.0.0.5 - 6
Broadcast Address:  10.0.0.7

HTH, please rate if that helps.