On Sun, 2005-04-10 at 20:24 -0700, Mickael Maddison wrote:
{snip}
> I'm curious... there seems to be a couple of default firewall rules
> that I'm not familiar with in the CentOS 4.0
These are also present in RHEL-4 and FC-3 from RedHat :)
{snip}
> Particularly, the 5353 udp allowing from 224.0.0.251 and the 631 udp.
> Anyone know what these are for, and if they should be disabled?
The 5353 udp is multicast DNS (or mDNS for short) ... here are a couple
links:
http://files.multicastdns.org/draft-cheshire-dnsext-multicastdns.txt
http://www.multicastdns.org/
The 631 udp port is for "Internet Printing Protocol". It is how cupsd
sees external printers. Here are some details:
http://mirror.centos.org/centos/4/docs/html/rhel-sag-en-4/s1-printing-sharing.html
-------------------------------------------
Also ... specifically from the RHEL-4 release notes:
"system-config-securitylevel
The firewall constructed by the system-config-securitylevel
configuration tool now allows CUPS and Multicast DNS (mDNS) browsing.
Note that, at the present time, these services cannot be disabled by
system-config-securitylevel."
-------------------------------------------
SO ... if the box needs to do either mDNS or CUPS printer browsing, you
need them enabled. If not, you can remove them.
Thanks,
Johnny Hughes
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