Why does my VPN add its own IP address range to my routing table with local gateway?

Dr-McGillicuddy asked:

My VPN sets up my routing table with 0/1 & 128.0/1 to their gateway.

However they also set the range of their data center to my local gateway. Let’s say 123.456.789.123/32 routes to

The default route is also left as

Why would they route their netblock to my gateway?

My answer:

So your VPN software can reach the VPN servers. That traffic can’t go over the VPN; it is rather the traffic that tunnels the VPN traffic.

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