In the DefSec org of the IALab there are 7 available org networks
The first 6 networks will give DHCP addresses in 10.x.100.0 - 10.x.200.0 and are all CIDR /16 (netmask 255.255.0.0). The upstream router which is also upstream DNS is at 10.x.0.1.
Connecting to the VPN will put you on 10.31.0.1/16. If you would like to connect to a vpn client from the red team network then you must add a route to 10.31.0.0/16 via 10.30.0.250.
Crude diagram of the main networks in the org. Please contact me if you want to make a better one :)