Solaris 10 and cups fun

         I have a Solaris 10 box to which I added, using its parallel
port, my laserwriter printer (I got tired of fighting with its ethernet
port for now and just want to print). I configured it with cups and it
works nicely in that computer. Now I want to make it accessible to the
other machines in the network. But, when I scan the open ports from one
of those machines, I do not see port 631 (i.e. nmap in the solaris box
to itself reveals port 631 but nmap from another box to it does not show
it), which makes me think it is being blocked... perhaps by ipfilter?

So, the first question is am I running a firewall here? If so, which
one (I thought pfil was part of ipfilter, but I am not assuming anything 
anymore)?

root@nassau-16>svcs -a | grep network | grep pfil
disabled       May_31   svc:/network/ipfilter:default
online         May_31   svc:/network/pfil:default
root@nassau-17>

And, according to its pfil.ap file, isn't it not checking any of my 
interfaces right now?

root@nassau-20>locate pfil.ap
/etc/ipf/pfil.ap
/var/sadm/pkg/SUNWipfr/save/pspool/SUNWipfr/reloc/etc/ipf/pfil.ap
root@nassau-21>cat /etc/ipf/pfil.ap
# IP Filter pfil autopush setup
#
# See autopush(1M) manpage for more information.
#
# Format of the entries in this file is:
#
#major  minor lastminor modules

#le     -1      0       pfil
#qe     -1      0       pfil
#hme    -1      0       pfil
#qfe    -1      0       pfil
#eri    -1      0       pfil
#ce     -1      0       pfil
#bge    -1      0       pfil
#be     -1      0       pfil
#vge    -1      0       pfil
#ge     -1      0       pfil
#nf     -1      0       pfil
#fa     -1      0       pfil
#ci     -1      0       pfil
#el     -1      0       pfil
#ipdptp -1      0       pfil
#lane   -1      0       pfil
#dmfe   -1      0       pfil

root@nassau-22> 


On the top of that, I do not have a ipf.conf file. Shouldn't that mean I 
do not have ipfilter running?