Review your favorite Linux distribution.
Go Back > Forums > Linux Forums > Linux - Networking
User Name
Linux - Networking This forum is for any issue related to networks or networking.
Routing, network cards, OSI, etc. Anything is fair game.


  Search this Thread
Old 04-03-2008, 01:08 AM   #1
Registered: Aug 2006
Posts: 168

Rep: Reputation: 15
which interface to graph (internal or external) ?

I have two interfaces on my ADSL router named internal and external.

I would like to graph the bandwidth of one of the interfaces. What is the difference between the two, as the traffic I presume will pass through both?

Old 04-03-2008, 08:46 AM   #2
Registered: Jul 2007
Distribution: Ubuntu
Posts: 99

Rep: Reputation: 16
Usually you can tell the difference between an internal and external interface by the ip of each. Usually the internal interface will have an ip in the private ip range. These consist of the following ranges. - - -

Check the ip of your interfaces and the one that is in the above range is the internal interface.
Old 04-03-2008, 10:48 PM   #3
Registered: Aug 2006
Posts: 168

Original Poster
Rep: Reputation: 15
Thanks. I can identify which is internal/external but was wondering the different in traffic bandwidth. I originally though the same traffic will pass through both. I thought about it a bit more and discovered there will be a slight difference in traffic.

If I monitor the internal interface, it would be a more accurate as all traffic will pass through (home network <--> internet).

If I monitor the external interface, the traffic would be slightly lower (or higher if getting DOS'ed) as the router would be blocking some malicious traffic from the internet which are not destined for my network.

Hope this makes sense.



Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
How to entry graph interface when start compter bydong Linux - Desktop 2 12-01-2007 04:21 AM
Iptables help w/ internal interface Histamine Linux - Networking 3 06-28-2007 05:14 PM
1 internal 1 external nic neocontrol Linux - Networking 4 02-14-2007 12:53 PM
router with 2 externel interface and 1 internal?? fhameed Linux - Networking 1 12-09-2004 06:24 AM
Modems: internal vs. external? Zen Arcade Linux - Newbie 7 06-21-2003 05:45 PM

All times are GMT -5. The time now is 08:43 AM.

Main Menu
Write for LQ is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration