?
Solved

stateful packet inspection -- relation to clients' computer security

Posted on 2009-07-02
2
Medium Priority
?
271 Views
Last Modified: 2012-05-07
What does the "state" of a TCP/IP packet have to do with whether it is from a user-requested web site, or from a hacker trying to gain access to a client computer, with reagrd to the "stateful packet inspection" that presumably only hardware firewalls are capable of?
0
Comment
Question by:Casey Claassen
[X]
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
2 Comments
 
LVL 32

Accepted Solution

by:
rsivanandan earned 140 total points
ID: 24765085
To simply look at it,

If the packet coming from outside

1. Has SYN and ACK bit set then it means that the connection was indeed originated from the inside machine and that is why acknowledgment is coming.

2. After that every packet passed has sequence numbers which are math bound and has relation with the packet sent.

So keeping the state information helps find it.

Now if a hacker sends a reply packet with 'syn' and 'ack' bit set, the machine won't entertain it since it didn't originate that traffic at all.

Does that help?

Cheers,
Rajesh
0
 

Author Closing Comment

by:Casey Claassen
ID: 31599172
Yes, that does indeed help!
0

Featured Post

On Demand Webinar: Networking for the Cloud Era

Did you know SD-WANs can improve network connectivity? Check out this webinar to learn how an SD-WAN simplified, one-click tool can help you migrate and manage data in the cloud.

Question has a verified solution.

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

Imagine you have a shopping list of items you need to get at the grocery store. You have two options: A. Take one trip to the grocery store and get everything you need for the week, or B. Take multiple trips, buying an item at a time, to achieve t…
A 2007 NCSA Cyber Security survey revealed that a mere 4% of the population has a full understanding of firewalls. As business owner, you should be part of that 4% that has a full understanding.
This tutorial will teach you the special effect of super speed similar to the fictional character Wally West aka "The Flash" After Shake : http://www.videocopilot.net/presets/after_shake/ All lightning effects with instructions : http://www.mediaf…
In this video, Percona Solution Engineer Dimitri Vanoverbeke discusses why you want to use at least three nodes in a database cluster. To discuss how Percona Consulting can help with your design and architecture needs for your database and infras…
Suggested Courses
Course of the Month11 days, 17 hours left to enroll

752 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