Linux - NetworkingThis forum is for any issue related to networks or networking.
Routing, network cards, OSI, etc. Anything is fair game.
Welcome to LinuxQuestions.org, a friendly and active Linux Community.
You are currently viewing LQ as a guest. By joining our community you will have the ability to post topics, receive our newsletter, use the advanced search, subscribe to threads and access many other special features. Registration is quick, simple and absolutely free. Join our community today!
Note that registered members see fewer ads, and ContentLink is completely disabled once you log in.
If you have any problems with the registration process or your account login, please contact us. If you need to reset your password, click here.
Having a problem logging in? Please visit this page to clear all LQ-related cookies.
Introduction to Linux - A Hands on Guide
This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.
Click Here to receive this Complete Guide absolutely free.
I have three different LANs setup. Let me call these networks FNET, WNET, and DNET. The network response time internal to each of these three networks is great... no problem at all.
Additionally, the connections between FNET and DNET work fine. Also, the connections between WNET and DNET are cool.
Now the problem: The connection between FNET and WNET is slow - in one direction. If I ping one box in WNET from FNET some packets are lost. File transfers between servers on these two networks are very slow (in the indicated direction) as well. However, neither ifconfig nor netstat report any errors, overflows, or drops.
FNET actually consists of two different multi-homed servers. These servers each have 3 different NICs, one for each network. One of the boxes acts as a router to route traffic between the three networks.
There is no semantic difference between the routes configured for WNET and DNET - at least that I can see. Yet, I cannot figure out what is causing the slowness. (The entire setup is using GB ethernet - routers and NICs.)
I thought for awhile that I had a cabling problem or a hardware problem. So I installed all new cat6 cabling and still have the problem. I then considered a WNET switch problem. But file transfers between boxes within WNET work fine. I even swapped machines used as the router in the FNET network and still have the problem.
All these machines are running Redhat (kernel 2.4).
Does anyone have any diagnostic suggestions?
Last edited by JELG; 10-11-2007 at 04:14 PM.
Reason: Updated to reflect new information.