Draytek VigorPro 5510 Series User Manual page 54

Src IP Start
Src IP End
Dest IP Start
Dest IP End
Dest Port Start
Dest Port End
You can check the box of Auto failover to other WAN to make
a backup WAN connection if the selected WAN interface fails to
connect to Internet.
Type the source IP start for the specified WAN interface.
Type the source IP end for the specified WAN interface. If this
field is blank, it means that all the source IPs inside the LAN will
be passed through the WAN interface.
Type the destination IP start for the specified WAN interface.
Type the destination IP end for the specified WAN interface. If this
field is blank, it means that all the destination IPs will be passed
through the WAN interface.
Type the destination port start for the destination IP.
Type the destination port end for the destination IP. If this field is
blank, it means that all the destination ports will be passed through
the WAN interface.
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VigorPro5510 Series User's Guide