port
Click on the red underlined text to get to the source
...
Service.Proto.Name TTL Class SRV Priority Weight Port Target
(There is an example near the end of this document.)
...
... - Hosts that are referenced by backup A records must use the port
number specified in Assigned Numbers for the service.
...
... The Port number ...
...
Currently, the translation from service name to port number happens
at the client, often using a file such as /etc/services ...
... Notes:
- Port numbers SHOULD NOT be used in place of the symbolic service
or protocol names (for the same reason why variant names cannot
...
... HTTP - server is the main server, new-fast-box is the backup
; (On new-fast-box, the HTTP daemon runs on port 8000)
http.tcp SRV 0 0 80 server.asdf.com.
...
... Some problems become more visible, though.
- The ability to specify ports on a fine-grained basis obviously
changes how a router can filter packets ...