Improve company productivity with a Business Account.Sign Up

x
?
Solved

ISP Shuts Down Internet Port due Suspicious Traffic (DOS)

Posted on 2014-01-21
2
Medium Priority
?
633 Views
Last Modified: 2014-03-20
Hi All,

This is related to an old issue which you can view the details of here:
http://www.experts-exchange.com/Networking/Network_Management/Network_Analysis/Q_28225609.html
(It's worth reading at least the first post)

This issue has again resurfaced, but this time we can not find any suspect software or malware on the individual PC's.

For this reason we are seeking a better way to monitor the SOURCE of this issue and trace down the problem.

Our switches are: Netgear gs752ts
They have a feature called "Auto-DOS Mode" which is currently disabled but can be enabled.
From reading the description it appears this feature is designed to prevent DoS attacks by shutting down the individual port causing the trouble.

We are considering enabling this feature but wanted to get some additional feedback before doing so.

Additionally --
You may have a better suggestion for how we can:
A) Determine where the suspicious traffic is originating
-or-
B) Stop the origination of suspicious traffic in the first place.

I look forward to your advice and feedback on this.
0
Comment
Question by:MPATechTeam
2 Comments
 
LVL 57

Accepted Solution

by:
giltjr earned 2000 total points
ID: 39798827
Your switch support port mirroring.  What I would suggest is that you mirror the traffic on the port that connected to your Internet router.

Setup a PC with Wireshark, connect it to the target port of the mirror session, and capture traffic for awhile and see if you can see which host within your network is generating the suspect traffic.
0
 

Author Closing Comment

by:MPATechTeam
ID: 39942678
This helped us track down the exact cause of the problem.
0

Featured Post

What Kind of Coding Program is Right for You?

There are many ways to learn to code these days. From coding bootcamps like Flatiron School to online courses to totally free beginner resources. The best way to learn to code depends on many factors, but the most important one is you. See what course is best for you.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Originally, this post was published on Monitis Blog, you can check it here . It goes without saying that technology has transformed society and the very nature of how we live, work, and communicate in ways that would’ve been incomprehensible 5 ye…
If you’re involved with your company’s wide area network (WAN), you’ve probably heard about SD-WANs. They’re the “boy wonder” of networking, ostensibly allowing companies to replace expensive MPLS lines with low-cost Internet access. But, are they …
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
In this tutorial you'll learn about bandwidth monitoring with flows and packet sniffing with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're interested in additional methods for monitoring bandwidt…

579 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