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

Notices

Reply
 
Search this Thread
Old 09-23-2003, 10:35 AM   #1
JLDixon
LQ Newbie
 
Registered: Sep 2003
Distribution: RedHat 8,9,EL4,Fedora,AIX5,Slackware10
Posts: 10

Rep: Reputation: 0
eth0 drops connection intermittently


I have a small issue with a RedHat 8.0 box. The ethernet connection intermittently terminates itself and then comes back up on its on. Output from ifconfig is below:

eth0 Link encap:Ethernet HWaddr *MAC Address*
inet addr:10.1.2.230 Bcast:10.1.2.255 Mask:255.255.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1719778 errors:0 dropped:0 overruns:0 frame:0
TX packets:4641 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:144065877 (137.3 Mb) TX bytes:1240336 (1.1 Mb)
Interrupt:5 Base address:0xb000

eth0:1 Link encap:Ethernet HWaddr *MAC Address*
inet addr:10.1.2.231 Bcast:10.1.2.255 Mask:255.255.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
Interrupt:5 Base address:0xb000

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:524 errors:0 dropped:0 overruns:0 frame:0
TX packets:524 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:62003 (60.5 Kb) TX bytes:62003 (60.5 Kb)

route -n output below:

Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
10.1.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo
0.0.0.0 10.1.1.1 0.0.0.0 UG 0 0 0 eth0
0.0.0.0 10.1.1.1 0.0.0.0 UG 0 0 0 eth0
0.0.0.0 10.1.1.1 0.0.0.0 UG 1 0 0 eth0

Also when this occurs the other machines on the network can't ping this box(of course) and this box can't ping any other machine on the same network. This box can however ping the loopback and the ip address configured on the eth0 and eth0:1 interfaces.

service network restart has no effect but restarting the box will correct the error until it occurs again.

Also occasionally I see spurious 8259A interrupt: IRQ7 error message and have read posts on this and can't find anything that explains the error. All research done on this error message says that it is irrelevant as the machine continues to run.

Any help would be appreciated...
 
Old 09-23-2003, 03:49 PM   #2
/bin/bash
Senior Member
 
Registered: Jul 2003
Location: Indiana
Distribution: Mandrake Slackware-current QNX4.25
Posts: 1,802

Rep: Reputation: 46
Do you have a firewall running? If so I would try restarting the firewall to see if this may be the problem.
 
Old 09-25-2003, 09:56 AM   #3
JLDixon
LQ Newbie
 
Registered: Sep 2003
Distribution: RedHat 8,9,EL4,Fedora,AIX5,Slackware10
Posts: 10

Original Poster
Rep: Reputation: 0
IPtables is set to be off in all runlevels and the box is behind a cisco PIX firewall but all other machines(windows) behind this firewall do not have any problems of this type. When this occurs I can't even ping the Linux machine from inside the firewall its almost like IPTables enabled itself and locked down all ports but if I go to the box and view the iptables config there are no rules set to be executed...
 
Old 09-25-2003, 07:34 PM   #4
camelrider
Member
 
Registered: Apr 2003
Location: Juneau, Alaska
Posts: 243

Rep: Reputation: 31
Check the cable connections. On my son's box inside my home n/w he was getting disconnected periodically and the cause appeared to be that when his box got too warm, the socket expanded more than the rj-45 plug at hsi NIC. The solution was to shield the box from a nearby furnace vent. :rolleyes
 
Old 09-26-2003, 04:54 PM   #5
JLDixon
LQ Newbie
 
Registered: Sep 2003
Distribution: RedHat 8,9,EL4,Fedora,AIX5,Slackware10
Posts: 10

Original Poster
Rep: Reputation: 0
Does anyone know how to disable the console blanking feature? I have shutdown the apmd service in all runlevels and have set a script to run at startup that includes setterm -blank 0, setterm -powersave off, and setterm -powerdown 0, but the terminal window blanking still occurs after the machine has been u pand inactive for about an hour. I'm not sure if this is a bug or not but the ethernet connection seems to drop each time the console goes blank...

If anyone knows of a way to turn off console blanking I would like to try that to see if it is the cause of this issue b/c it is the only thing that I can link to the error currently. There are no messages in any of the logs that reference the network connection or any of the ethernet adapters.
 
Old 09-28-2003, 04:27 PM   #6
JLDixon
LQ Newbie
 
Registered: Sep 2003
Distribution: RedHat 8,9,EL4,Fedora,AIX5,Slackware10
Posts: 10

Original Poster
Rep: Reputation: 0
I think I figured out what was going on here....
I set up a monitoring tool to ping the server every 5 minutes and the link has not been down since. I guess it was just shutting itself off after a long period of inactivity. It is working now but if there is another way around this I would love to know.
 
  


Reply


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
Connection drops out, must reboot? tmpatrick Linux - Wireless Networking 6 03-03-2011 08:13 PM
Internet connection/Cable Modem resets intermittently NLawrence Linux - Networking 1 04-23-2005 02:10 PM
Machine rebooting when eth0 drops. Ansible Linux - Networking 11 10-16-2004 02:39 PM
Mandrake 10 Official drops eth0 configuration cabinetcrafter Mandriva 10 10-11-2004 08:32 AM
Network Drops Out on eth0 dkranendonk Linux - Networking 1 05-11-2002 12:24 AM


All times are GMT -5. The time now is 03:20 AM.

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