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08.02.2007 at 06:29PM PDT, ID: 22739217
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8.0

Sniff Packets to remove Blacklist entries from CBL etc...

Asked by kshays in Network Security, Network Switches & Hubs

Tags: , , ,

Firewall:  Smoothwall 2.0
Switches: Dlink (orange, green)
Servers: Windows 2000/2003 and Linux(Debian)
Workstations: (Windows XP sp2)
Email Server:  Exchange Server 2003

Diagram:
                                     Cisco Router
                                              |
             Smothwall Firewall (Red nic, Orange nic, Green nic)
                                                             |                   |
                                                            Switch         Switch
                                                             |                   |
                                                          DMZ            LAN
                                                             |                   |
                                                       Servers     Workstations

The firewall server has three nics.  
- Red = Outside (cat5 from cisco router goes to this nic)
- Orange = DMZ (cat5 from 2nd nic goes to Dlink switch for dmz servers)
- Green = LAN (cat5 from 3rd nic goes to Dlink switch for workstations and other servers)

What I am trying to do is narrow down which system sent out the email (infected by either a virus/spamware/trojan/malware) and got our public IP on the blacklist.  The RED nic is set to the public IP that we was given and all workstations inside the LAN are translated into this address when visiting anything on the internet.

Where is the best place and how to place a simple hub so I can capture the packets to see if there is a zombie or bot somewhere that could be using port 25.  The hub is a really old 10m with a normal/uplink switch to use.

Thanks,

Kevin


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Keywords: Sniff Packets to remove Blacklist entrie…
Title
1 Trojan SPM/LX
2 Help removing Zlob Trojan
3 PC infected with  spyware / malware
4 Spybot worm + Trojan problems: Ple…
5 cbl blacklist what to do
6 Blacklisting
 
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[+][-]08.03.2007 at 07:44AM PDT, ID: 19625409

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About this solution

Zones: Network Security, Network Switches & Hubs
Tags: remove, blacklist, cbl, how
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Solution Provided By: yawns
Participating Experts: 1
Solution Grade: A
 
 
[+][-]08.03.2007 at 07:53AM PDT, ID: 19625491

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