Mac OS Vpn Problem

Hello there,

I use a 90d firewall. However, when I make vpn with mac, if local modem is default gateway "192.168.1.1" I can not access to vpn even if vpn is connected.

But if the default gateway "192.168.1.1" is different, I live in trouble on the mac.

But I am having this problem when I connect to a computer on the same network from windows.

I did not find a strange problem solution.