Solved

unidirect vs bidirect port

Posted on 2011-02-19
4
653 Views
Last Modified: 2012-05-11
for every port, is there an option to keep them unidirectional and also bidirectional? or does it apply to only certain ports to have bi-directional?

thanks
0
Comment
Question by:anushahanna
4 Comments
 
LVL 6

Assisted Solution

by:Gugro
Gugro earned 166 total points
ID: 34936857
Every port is bidirectional. When you start  a server process it will attach to a port and listen for incoming packets. When he receive a packet the process may ( or may not ) answer to this packet.
So you have incoming and outgoing packets on this port.
0
 
LVL 3

Accepted Solution

by:
clinker83 earned 167 total points
ID: 34937086
You can control services and the direction on ports using a firewall. This will allow you to specify which machines have access to services based on their ip address and you will also be able to control whether they are incoming, outgoing or both.
0
 
LVL 79

Assisted Solution

by:lrmoore
lrmoore earned 167 total points
ID: 34937591
Since this is posted in the Network Switches and Hubs zone, are you referring to physical switchports on a network switch?
Sometimes we set one port to unidirectional if we want to mirror all other ports to that one and have something attached that just drinks in all the data, like a packet analyzer. No data needs to be sent to the network from that device. If it does, we typically use a 2nd NIC connected to a standard bi-directional port.
The default is going to be bi-directional on almost any switch.
0
 
LVL 6

Author Comment

by:anushahanna
ID: 34966767
very helpful- thanks.

By default, are there ports that can or just needs to be single directional? if so, what are they- is there a compilation of those?

for example, 1433 just needs to be opened in one direction, and that is enough- is that a good example?
0

Featured Post

Why You Should Analyze Threat Actor TTPs

After years of analyzing threat actor behavior, it’s become clear that at any given time there are specific tactics, techniques, and procedures (TTPs) that are particularly prevalent. By analyzing and understanding these TTPs, you can dramatically enhance your security program.

Join & Write a Comment

Suggested Solutions

Article by: rfc1180
The Maximum Segment size (MSS) is an important consideration when troubleshooting connectivity via the Internet/Intranet. As the packets are routed via the Internet/Intranet, the packets must traverse through multiple routers in the path between two…
I see many questions here on Experts Exchange regarding switch port configurations and trunks. This article is meant for beginners in the subject to help to get basic knowledge about Virtual Local Area Network (VLAN (http://en.wikipedia.org/wiki/Vir…
It is a freely distributed piece of software for such tasks as photo retouching, image composition and image authoring. It works on many operating systems, in many languages.
Access reports are powerful and flexible. Learn how to create a query and then a grouped report using the wizard. Modify the report design after the wizard is done to make it look better. There will be another video to explain how to put the final p…

706 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

Need Help in Real-Time?

Connect with top rated Experts

20 Experts available now in Live!

Get 1:1 Help Now