FC4 : Funny entries in iptable

[yukku yukkoooooo]

Hi,
     I am a newbie with somebasic  unix knowledge. I installed FC4 a week back and I found funny entries in /etc/sysconfig/iptables file.
 It goes like this -
 -A RH-Firewall-1-INPUT -p udp --dport 5353 -d 224.0.0.251 -j ACCEPT
 -A RH-Firewall-1-INPUT -p udp -m udp --dport 631 -j ACCEPT
 What is the IP adrress doing and why has it been enabled at install time ?
 I downloaded FC4 iso files from redhat and suspect the images to be hacked into, though running sha1sum on disk 1 passed.
 Actually I installed FC4 with internet disconnected to find out whether it was a post install hack or a installation disk problem.
 Any clues  ...
 Thanks for the help
 yukku
 
		
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