Access to local lan via VPN

I have VPN server in my home, and wanna connect my FreeBSD VPS by OpenVPN for mount disk by NFS.
I have correctly VPN configuration, but i have problem with routing for access to lan but without change my default gateway.
When i put in server configuration:
redirect-gateway def1
I lost connection to VPS, by my public IP.

What i should put in my firewall?