[Snort-users] Log entry

Wirth, Jeff WirthJe at ...4876...
Tue Feb 26 11:17:08 EST 2002


> ID=38386 PROTO=ICMP TYPE=3 CODE=3

ICMP code 3 is a "Port Unreachable" message for closed UDP port.

> aa.aa.aaa.aaa DST=(me)xxx.xxx.xxx.xxx LEN=78 
> TOS=0x00 PREC=0x00 TTL=112 ID=20908 PROTO=UDP 
> SPT=1046 DPT=137 LEN=58 ]

I am not really familiar if iptables log format, but this looks like the IP
header of the original message. 

- Jeff

-----Original Message-----
From: Scott Taylor [mailto:scottt at ...4859...]
Sent: Tuesday, February 26, 2002 1:07 PM
To: snort-users at lists.sourceforge.net
Subject: [Snort-users] Log entry


I was wondering if anyone could help me decipher 
this log entry. Or direct me to some place that 
could:

Feb 26 08:13:09 GENESIS1 kernel: IN= OUT=eth0 
SRC=(me)xxx.xxx.xxx.xxx DST=(outside)
aa.aa.aaa.aaa LEN=106 TOS=0x00 PREC=0xC0 TTL=255 
ID=38386 PROTO=ICMP TYPE=3 CODE=3 [SRC=(outside)
aa.aa.aaa.aaa DST=(me)xxx.xxx.xxx.xxx LEN=78 
TOS=0x00 PREC=0x00 TTL=112 ID=20908 PROTO=UDP 
SPT=1046 DPT=137 LEN=58 ]

I'm using iptables. I know OUT=eth0 is where the 
packet got dropped SRC=(me) is my external if. 
DST=(outside) is someone else. Why is there a 
second set of SRC and DST? the braketed part? 
[SRC=(outside) DST=(me) PROTO is UDP and source 
port is 1046 destination port is 137]

Now I know 137 is a window port. I guess I'm 
confused as to who generated the packet. Me or 
The outside IP, because the first source says 
it's me, and the second say's its the outside.

Is this a spoofing type attack perhaps?

Thanks for any input. 

Cheers,
Scott.
NOTE: I didn't post the IP's this time ;)

THERE IS ONLY ONE... 
SOCCER.COM, The Center of the Soccer Universe
http://www.soccer.com

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