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.
There is less than 24 hours left to vote in the 2015 LinuxQuestions.org Members Choice Awards. Click here to go to the polls. Vote now and make sure your voice is heard!
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 an NFS issue that seems to only occur on my Fedora 14 machine at the moment. I was actually have a similar issues with a RHEL 6.1 box too, but that seemed to go away after I disabled the services for fcoe and lldpad. I don't really know why those were an issue, but it seemed to work.
The issue I see is that I will get into a shell and try to cd to a directory inside the nfs share (which is auto-mounted by the way), and my prompt will sit there anywhere from 1 to 6 minutes before returning. After that first command, the nfs share will be responsive for a while. Then, if I stop for a few minutes, probably less than 5 minutes, and go back to that same shell, I'll get another delay of a few minutes. I thought this would be a good use of tcpdump, but I'm not sure how to get it to catch just nfs traffic.
Any ideas on command syntax, port numbers, and such to try with tcpdump or ideas on a fix for this particular type of nfs issue are appreciated.
That's the funny thing. This share can be accessed by sftp, samba, scp, or https, and I have no issues with any of those from this computer. The name resolution doesn't appear to be a problem either.
Before I had thought that ridding myself of fcoe and lldpad helped my one box, but I think that was just a coincidence. Both of the computers that I was having issues with are on a router with the NFS share located beyond the router. I think the router must have been the majority of the issue. Once I unplugged the laptop and switched over to wireless and plugged the desktop directly into the network without a router, the NFS share was responsive.
For now, it is not really a big deal to run without the router, but I am curious why the firewall was letting enough traffic through for the share to eventually work. The lag is a either 3 minutes and 40 seconds approximately or around 6 minutes 30 seconds. It's consistent enough that I suspect my computer and the remote machine are running through a predefined pattern, and they hit a working combination at one of those time intervals. Once the connection gets through, it's responsive (<<1 second) until I leave it alone for a while. After that I'll see the delay again.
I've heard that newer NFS protocols use dynamic port assignments. Is there any chance those would not get marked "RELATED" or "ESTABLISHED" in a way that the router would block it? Sounds like a good job for tcpdump if had the patience to wade through the information or could give it a detailed enough expression to limit data.
I can't remember the router model at the moment, but it looks identical to my old Linksys WRT54G minus the wireless capability.
Some routers have really bad performance with SMB and NFS (especially NFS, because it tries to use as big packet as it is possible). Some routers are actually such slow, that I can't believe it (80MiB/s on IEEE802.3ab between desktop and server (connected directly) and 0.6MiB/s between both desktop and server to/from laptop on wireless). NFS is good for whole wired connections, somehow IEEE802.11 isn't good choice for NFS.
You can try to change IEEE802.11 settings (like CTS, fragmentation and CTSless packet (packet smaller then threshold will go through without CTS). I strongly advise you to set CTS on, set CTS to 1460 and fragment to 1500, but it could clash with host without such settings