Avoid VPN and DHCP address space collision

[sbworth]

The address spaces for DHCP (10.10.10.50 – 10.10.10.254) and VPN (10.10.10.10 – 10.10.10.59) overlap from 10.10.10.50-10.10.10.59. Fairly sure these are supposed to be distinct spaces. There are two obvious ways to eliminate the overlap.

DHCP 10.10.10.50 --> 10.10.10.60

or
VPN 10.10.10.10.59 --> 10.10.10.49.

I have, rather arbitrarily, chosen the latter.

[s-makin]

Nice catch! Thanks for taking the time to put in this PR, we appreciate you helping to make the Server docs better