pools of ports (instead of pools of ip addresses)

Greetings,

I read about the *ippool* feature where the examples show how ippools can
be defined as groups of ip addresses.

Is it possible to use ippools for other objects as well ?

Like sets (pools) of tcp port numbers, for example.

If this is possible, is it please possible to give an example ?

It would be nice if a pool could be defined for example,

pool ports = { telnet, ftp, rexec, www }

so to speak and then in the /etc/ipf.conf file it could be possible to
accept traffic (or block traffic) to that pool of "ports", instead of
enumerating the ports in the ipf.conf file, it could just refer to the pool.

I am also thinking specifically of my application of RPC filtering.

I am trying to setup RPC call/response filtering, and I was thinking that
it could be nice to use the IPFILTER ippool feature to define pools of RPC
program numbers.

For example, for NetWorker, I could define the pool as the union of

portmapper and 390100:390120

This is a pool of 1 rpc program number (100000, portmapper) + a set of about
20 other rpc program numbers.


Is this possible , does it make sense to try to extend the ippool feature
for tcp / udp or rpc ports and not use pools only for ip addresses ?

Regards,
David STes