Wht are these iptables logs have to do with hang up?

Hi Geeks,
My machine was hanged up in the morning...and lots of iptables logs were started pouring on screen...I was even unable to login..

The messages were something like that:
10.0.1.255 LEN=78 TOS=0x00 PREC=0x00 TTL=128 ID=22244 PROTO=UDP SPT=137 DPT=137 LEN=58
Jul 26 12:17:51 mail1 kernel: IPTABLES UDP-IN: IN=eth0 OUT= MAC=ff:ff:ff:ff:ff:ff:00:0d:61:2f:06:19:08:00 SRC=10.0.1.49 DST=10.0.1.255 LEN=78 TOS=0x00 PREC=0x00 TTL=128 ID=16750 PROTO=UDP SPT=137 DPT=137 LEN=58
Jul 26 12:17:51 mail1 kernel: IPTABLES UDP-IN: IN=eth0 OUT= MAC=ff:ff:ff:ff:ff:ff:00:0d:61:2b:b5:0b:08:00 SRC=10.0.1.111 DST=10.0.1.255 LEN=78 TOS=0x00 PREC=0x00 TTL=128 ID=19591 PROTO=UDP SPT=137 DPT=137 LEN=58
Jul 26 12:17:51 mail1 kernel: IPTABLES UDP-IN: IN=eth0 OUT= MAC=ff:ff:ff:ff:ff:ff:00:0d:61:2f:06:19:08:00 SRC=10.0.1.49 DST=10.0.1.255 LEN=78 TOS=0x00 PREC=0x00 TTL=128 ID=16757 PROTO=UDP SPT=137 DPT=137 LEN=58
Jul 26 12:17:51 mail1 kernel: IPTABLES UDP-IN: IN=eth0 OUT= MAC=ff:ff:ff:ff:ff:ff:00:11:11:2f:9b:44:08:00 SRC=10.0.1.71 DST=10.0.1.255 LEN=78 TOS=0x00 PREC=0x00 TTL=128 ID=49919 PROTO=UDP SPT=137 DPT=137 LEN=58

Can anyone tell me is it h/w issue or kernel..?
And if h/w is it with n/w card...?

Thanks..

 

 

 

 

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