Snort mailing list archives

AW: AW: no payload on ppp0


From: Jochen Vogel <jvogel () it-sec de>
Date: Mon, 27 Oct 2003 11:24:24 +0100

if i do an snort -vd i can see payload on all interfaces
eth0, eth1 and ppp0


sorry.
ppp0 & eth0 are on the same interface.


You could try a Tap between ppp0 and eth0.  That might solve your
problem without too much work. Google "network taps" and you
should get a good variety of info and vendors to check out.  One
note, if you tap you will need to build a snort box with 2
sniffer interfaces.  One for receive traffic and one for send
traffic as the tap will spilt them up on two different lines.

Shawn

<mail () cortical de> 10/25/03 04:43am >>>
hi,

this iy my topo

    |
   ppp0
   eth0
    |
firewall-eth2-
    |
   eth1

-how can i use snort on the external side with payload?



-----Ursprungliche Nachricht-----
Von: snort-users-admin () lists sourceforge net
[mailto:snort-users-admin () lists sourceforge net]Im 
Auftrag von Erek
Adams
Gesendet: Freitag, 24. Oktober 2003 20:44
An: Jochen Vogel
Cc: snort-users () lists sourceforge net
Betreff: Re: [Snort-users] no payload on ppp0


On Fri, 24 Oct 2003, Jochen Vogel wrote:

hi,

iuse redhat9 with iptables and pppoe.

i start snort with /usr/local/bin/snort -c 
/etc/snort/snort.conf -d -D
and log the unified log file with barnyard into mysql 
and to dump.log

if i use eth1 i can see payload
[**] [1:407:4] ICMP Destination Unreachable (Undefined 
Code!) [**]
[Classification: Misc activity] [Priority: 3]
Event ID: 2     Event Reference: 2
10/24/03-10:56:53.873905 194.9.167.200 -> 192.168.63.1
ICMP TTL:52 TOS:0xC4 ID:47986 IpLen:20 DgmLen:74
Type:3  Code:3  DESTINATION UNREACHABLE: PORT UNREACHABLE
00 00 00 00 45 84 00 2E 27 D3 00 00 74 11 B4 EC  
....E...'...t...
C0 A8 3F 01 C2 09 A7 C8 0C 40 12 39 00 1A 6A 61  
..?......@.9..ja
E3 9A 5F 74 52 6D 93 CB 93 75 0E 52 26 1A 4F C6  
.._tRm...u.R&.O.
CC 73                                            .s



=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
=+=+=+=+=+=+


if i use ppp0 i cant see payload
[**] [1:409:4] ICMP Echo Reply (Undefined Code!) [**]
[Classification: Misc activity] [Priority: 3]
Event ID: 48     Event Reference: 48



=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
=+=+=+=+=+=+

Snort can't decode PPPoE fully.

Use eth1 instead.

Cheers!

-----
Erek Adams

   "When things get weird, the weird turn pro."   H.S. Thompson


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