Using a /31 subnet mask helps conserve your IP address space for point to point links. It doubles the number of links that you can number from a given block of addresses. Think of large organisations that have hundreds of WAN links but are rapidly running out of address space.

Router + AP on same subnet, having issues - May 2011 May 19, 2011 [SOLVED] Configuring Point-to-Point - SonicWALL - Spiceworks Oct 17, 2012

Mar 11, 2019 · What would happen if a point-to-point link is addressed with a /31 subnetmask? In networking, when a point-to-point link is mentioned, what comes to mind is a /30 subnetmask. The use of the /30 subnetmask is generally seen as a move geared towards the conservation of IP addresses.

I'm trying to create point to site VPN. I have created new virtual network. Its address space is 172.16.0.0/24 I'm trying to do step 2 of linked article to add new gateway subnet. However I cannot figure out what is wrong with my address range.

The Case for /127 Subnets | Network World

Solved: when and why we use /31 subnet - Cisco Community