iptables and/or CUPS question

[Bill Tangren]

My RHEL ES4 box is behind a firewall. I have it set up as a CUPS print
server. I noticed that I was getting this in my logwatch output (when
Detail is set to Low):

  --------------------- Kernel Begin ------------------------
   From 10.1.5.58 - 2764 packets to udp(631)
  ---------------------- Kernel End -------------------------

My box IS 10.1.5.58. It looked like iptables on my box was stopping
packets from itself, so I bumped up the detail to Med, and got this:

  --------------------- Kernel Begin ------------------------
    From 10.1.5.58 - 2777 packets
       To 10.255.255.255 - 2777 packets
          Service: ipp (udp/631) (INPUT packet died:,eth0,none) - 2777
packets
  ---------------------- Kernel End -------------------------

This is a typical /var/log/message entry:

Aug 11 12:13:26 mach2 kernel: Invalid packet: IN=eth0 OUT= 
MAC=01:00:5e:00:00:01:08:00:4e:b0:01:e9:08:00 SRC=10.1.4.238 
DST=224.0.0.1 LEN=36 TOS=0x00 PREC=0x00 TTL=255 ID=53647 PROTO=ICMP 
TYPE=9 CODE=0


Could anyone tell me (or point me to a link that explains) why iptables
is doing this. It occurred to me that the print server might be badly
configured, but I am able to use it to print from other computers on our
network. And, there is no 10.255.255.255 box on the network.

Any ideas?

TIA,

Bill Tangren