Number of routes is limited
The NetworkManager plugin limits the number of received routes to 100. That number is too low for some VPNs.
The number is hardcoded at src/nm-fortisslvpn-pppd-plugin.c:242.
I've upped the number to 200, and that seems to work fine. It's still hardcoded and arbitrary, and possibly too low. Can we make it (a) larger by default? and (b) less arbitrary?