How to specify DHCP Range in Config File CentOS

tklosterman888

What is the proper way to specify the DHCP Range to clients? Server configuration file (openvpn.conf)

mwandelaar

Yes, that's the way to do so:

--server network netmask

A helper directive designed to simplify the configuration of OpenVPN's server mode. This directive will set up an OpenVPN server which will allocate
addresses to clients out of the given network/netmask. The server itself will take the ".1" address of the given network for use as the server-side end‐
point of the local TUN/TAP interface.

For example, --server 10.8.0.0 255.255.255.0 expands as follows:

janjust

if you want to specify a different range then replace the

dev tun
server 10.8.0.0 255.255.255.0

statement with

mode server
tls-server
ifconfig 10.8.0.1 10.8.0.2
ifconfig-pool 10.8.0.4 10.8.0.251
route 10.8.0.0 255.255.255.0
push "route 10.8.0.0 255.255.255.0"
push "route 10.8.0.1"

it's the 'ifconfig-pool' that specifies the DHCP IP range. It's also possible to specify ranges outside of the server VPN IP, but in that case routing becomes trickier.