Should i be worried?

["Erik Ahlner" <whyz@home.se>]

Hello!

I just happened to do a dmesg, and got this output:

IN=eth0 OUT=eth0 SRC=192.168.0.186 DST=130.236.230.9 LEN=74 TOS=0x00
PREC=0x00 TTL=127 ID=14459 PROTO=UDP SPT=137 DPT=53 LEN=54
IN=eth0 OUT=eth0 SRC=192.168.0.186 DST=130.236.230.9 LEN=74 TOS=0x00
PREC=0x00 TTL=127 ID=14715 PROTO=UDP SPT=137 DPT=53 LEN=54
IN=eth0 OUT=eth0 SRC=192.168.0.88 DST=217.209.28.135 LEN=48 TOS=0x00
PREC=0x00 TTL=127 ID=37469 DF PROTO=TCP SPT=2418 DPT=80 WINDOW=16384
RES=0x00 SYN URGP=0


As you can see, i get some message about traffic from 192.168.0.186 and .88
.. these two computers are NOT in my home network, so i guess that someone
has named his computers like that on the university network, even though the
university network has 130.236.x.x.
Is this a problem for me?
And what does this output actually mean?
Has someone used my computer as a router?
If they have, how is that possible?
This is what my iptable looks like:

$IPTABLES -P INPUT ACCEPT
$IPTABLES -F INPUT
$IPTABLES -P OUTPUT ACCEPT
$IPTABLES -F OUTPUT
$IPTABLES -P FORWARD DROP
$IPTABLES -F FORWARD
$IPTABLES -t nat -F

$IPTABLES -A FORWARD -i $EXTIF -o $INTIF -j ACCEPT
$IPTABLES -A FORWARD -i $INTIF -o $EXTIF -j ACCEPT
$IPTABLES -A FORWARD -j LOG

$IPTABLES -t nat -A POSTROUTING -o $EXTIF -j MASQUERADE
$IPTABLES -A INPUT -s 192.168.0.0/24 -i eth0 -j DROP

I thought that the last line was to stop this from happening..
Or am i just stupid? Did dmesg just show me that some packets have been
dropped?

Many thanks

Erik Ahlner