Find the IP of the DHCP-Server that gives the IP:
ipconfig getpacket en1 (or en0)
Note: ipconfig, not ifconfig!
Add route:
sudo route -n add -net 10.70.0.0/16 10.70.68.1
Mount Synology-NAS to MAC:
sudo mkdir /private/nfs
sudo mount -t nfs -o resvport,rw 192.168.91.164:/volume1/Video_HD /private/nfs/