Solved

unidirect vs bidirect port

Posted on 2011-02-19
4
670 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
[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
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

Is your NGFW recommended by NSS Labs?

Ours is! NSS Labs Next Generation Firewall Test gives the WatchGuard Firebox M4600 a "Recommended" rating! Curious where your NGFW landed on the  Security Value Map? See the map and download the full report today!

Question has a verified solution.

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

I eventually solved a perplexing problem setting up telnet for a new switch.  I installed a new Cisco WS-03560X-24P switch connected to an existing Cisco 4506 running a WS-X4013-10GE Sup II-Plus. After configuring vlans and trunking,  I could no…
Network ports are the threads that hold network communication together. They are an essential part of networking that can be easily ignore or misunderstood, my goals is to show those who don't have a strong network foundation how network ports opera…
This is a high-level webinar that covers the history of enterprise open source database use. It addresses both the advantages companies see in using open source database technologies, as well as the fears and reservations they might have. In this…
If you're a developer or IT admin, you’re probably tasked with managing multiple websites, servers, applications, and levels of security on a daily basis. While this can be extremely time consuming, it can also be frustrating when systems aren't wor…

696 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