DeleGate reference manual version 9.9 / -Phost:port option
This option specifies on which entrance port DeleGate receives
requests from clients.
As a typical example, "-P8080" means it accepts request on TCP port
numbered 8080 on any network interface belong to the host machine.
When the host has multiple interfaces or multiple IP addresses
assigned to a single physical interface, you can select one of them
with the specification format -Phost:portNum, like
"-Plocalhost:8080" for example.
A DeleGate server can accept from multiple ports or (limited) multiple
network interfaces by -Pport,port,...
When no host is specified, only IPv4 addresses are accepted.
That is, -P8080 is the abbreviation of "-P0.0.0.0:8080".
To specify IPv6 address here, substitute each colon symbol in the
IPv6 address notation with an under score symbol. Fore example,
"-P__:8080" means accepting at port 8080 with the wild card address
of IPv6 "::". If necessary, a scope-ID can be specified with "%" symbol,
like "-Pfe80__12_34%en0:8080" for example.
Note: See SRCIF
as to selection of a source address of an outgoing connection.