Latest LQ Deal: Linux Power User Bundle
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 04-20-2004, 05:02 PM   #1
LQ Newbie
Registered: Apr 2004
Posts: 2

Rep: Reputation: 0
50% packet loss only with Linux


I have a dual boot Pentium4 system with Linux and Windows XP and a Linux box as router, the dual boot system's NIC and one of the router's NICs connected to a switch.
The P4 system has a onboard RTL8139 type RTL8100.
If i boot up Windows, networking is just fine, but when i boot Linux on the Pentium and try to access LAN or Internet , an unexplainable 50% packet loss occurs between the Pentium4 system and the router, in both directions and affects all kinds of communications; this means networking is possible but extremely slow compared to normal operation. The RTL8139 is identified correctly at boot and set up. (only apparently?)

As far as i could determine , in this case the packet loss is NOT caused by:

-IPv6 / IPv4 compatibility problems
-wrong IP configuration
-MTU size

perhaps its a matter of full/half duplex configuration, but since there's a switch between this seems less probable, or am i wrong?
i have tried different linux distributions boot cds, installations, kernel versions, compiled 8139too into the kernel or as module, the network controller is always recognized as rtl8139 type 8100 (which is perfectly right).

now what may be the cause for this packet loss?
any suggestions?

thx in advance
Old 04-20-2004, 05:33 PM   #2
Senior Member
Registered: May 2001
Location: Bristol, UK
Distribution: Slackware, Fedora, RHES
Posts: 2,243

Rep: Reputation: 46
Does ifconfig show a larger number of errors? Is anything mentioned in the messages or syslog files? Are there any hints in the output of dmesg?

cheers and welcome to LinuxQuestions!

Old 04-21-2004, 06:24 AM   #3
LQ Newbie
Registered: Apr 2004
Posts: 2

Original Poster
Rep: Reputation: 0
well, there are no errors at all, no unusual messages. packets just dissappear.
i will start sniffing on all involved interfaces to check out if the packets themselves have some unusual characteristics that might cause some of them to be dropped somehow or whatever happens to them.


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
packet loss. bruse Linux - Networking 1 09-01-2005 09:24 AM
ping packet loss 100% kpachopoulos Linux - Networking 1 04-14-2005 06:29 PM
70% packet loss bingviini Linux - Networking 5 11-18-2004 12:35 PM
What can cause packet loss? Micah Linux - Hardware 8 03-15-2004 01:31 AM
90% packet loss to router? OatBran Linux - Networking 7 11-19-2001 02:54 AM > Forums > Linux Forums > Linux - Networking

All times are GMT -5. The time now is 10:43 PM.

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