In Red Hat Enterprise Linux 3, 4 and 5 we ship with 'BrowseAllow
@LOCAL' (the upstream default at the time), which causes CUPS to drop
UDP Browse packets from source IP addresses not matching a local subnet
(i.e. interface address & netmask, for each interface).
In Fedora we ship with 'BrowseAll All' in the CUPS configuration,
which allows all UDP Browse packets in.
Communication to 631/udp is allowed by default in iptables configuration.
Further info from Tim Waugh:
In Red Hat Enterprise Linux 3, 4 and 5 we ship with 'BrowseAllow
@LOCAL' (the upstream default at the time), which causes CUPS to drop
UDP Browse packets from source IP addresses not matching a local subnet
(i.e. interface address & netmask, for each interface).
In Fedora we ship with 'BrowseAll All' in the CUPS configuration,
which allows all UDP Browse packets in.
Communication to 631/udp is allowed by default in iptables configuration.