The default /etc/networks with FreeBSD 2.1.0 and 2.1.5 has the lines
your-net 127 # your comment
your-netmask 255.255.255 # subnet mask for your-net
1. I don't see docs on a "mask" syntax in /etc/networks.
What commands grok "your-netmask" in /etc/networks?
Is the general pattern
<netname> <net-ip> ...
2. What is the rule for when it is ok to leave out which parts of the dotted
quads for network IP and netmask IP in /etc/networks?