Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

Rouge System

Posted on 2004-08-11
5
199 Views
Last Modified: 2013-12-04
This might sound like a simple question but I am kind of new to the security side of networking.  How am I able to find a rouge system on my network?  I ran GFI's Langaurd and it came back with the IP address it is using and also says it is probably a Unix box.  It is running Samba 2.2.3a(build26).  But when I look for it in active directory users and computers it does not show up.  The Unix box has three open ports 139,110,25.  I can ping it but can't trace it down.  Any suggestions are exteremly invited.


Thank you,
Erick
0
Comment
Question by:ebouza
5 Comments
 
LVL 11

Expert Comment

by:cfairley
ID: 11774773
Erick,

I would not show up in AD because it does not have a Domain account.  I would try the following:
nslookup "ip address"

This should give you the DNS name for the box.  Also, search for the IP address in DHCP and/or WINS to get the name for the box.

Just some suggestions, I'm not a security expert either.

Thanks,
0
 
LVL 14

Accepted Solution

by:
dlwyatt82 earned 250 total points
ID: 11775861
If you already have the machine's IP addres, but don't know where to physically find it, I hope you have a managed switch :)
The LanGuard software you mentioned may have also given you the MAC address of the rogue system. If it didn't, you can obtain this information through windows by:

Going to a Windows PC on the same subnet as the rogue system
Pinging the rogue system's IP address.
Run "arp -a" from a command prompt to get the MAC address.

Once you have that, log onto your managed switch for that vlan / subnet, and find out which port the rogue system is plugged into. Once you know which port the culprit is using, you can walk straight to the PC and find out what's going on (assuming you have well-documented cable runs between your patch panel and wall jacks). You also have the option of just unplugging the rogue system's network cable from the switch if you are worried about security and you are sure it is NOT supposed to be on your network.
0

Featured Post

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
PGP key : industry standard 2 77
Encryption solutions to transport 150GB data fr AIX & Solaris to offsite vendor 11 82
is this a virus? 3 57
Soundcloud.com 4 45
Recently, a new law in my state forced us to get a top-to-bottom analysis of all of our contract client's networks. While we have documentation, it was spotty at best for some - and in any event it needed to be checked against reality. That was m…
Recently, I read that Microsoft has analysed statistics for their security intelligence report. It revealed: still, the clear majority of windows users do their daily work as administrator. An administrative account is a burden, security-wise. My ar…
This video shows how to quickly and easily add an email signature for all users on Exchange 2016. The resulting signature is applied on a server level by Exchange Online. The email signature template has been downloaded from: www.mail-signatures…

856 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question