Help answer threads with 0 replies.
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 04-01-2006, 10:26 AM   #1
LQ Newbie
Registered: Apr 2006
Posts: 1

Rep: Reputation: 0
Broadcast over multiple/specific NIC for wake on lan problem


I'm having a problem with wake-on-lan. The configuration is as follows :

One server, two nics.
One nic is for local lan, and the other is connected directly (crossover) to a NAS (there is a reason why the NAS is connected directly to the server, and not the LAN)

The nic for the LAN is eth0 in the range, the other eth1 on range Up to here everything works great, I can connect without issues, so all links work correctly.

The problem however is when I want to wake-on-lan the NAS from the server. I've tried three different programs (the client app delivered with the NAS, a PERL script and a PYTHON script) to do the WOL, but they all fail. When I tcpdump I see that the broadcast is sent only over eth0 and not eth1 as well. This means that the NAS doesn't get to see the magic WOL packet and won't start up.

The broadcast address used in the scripts is, and other ones won't work (I've tried as it said in ifconfig).

Is there any way I can specify which interface to choose when broadcasting the magic packet e.g. in Python?
Or do the routing tables have something to do with this?

Old 04-02-2006, 05:29 PM   #2
Registered: Jul 2004
Location: Netherlands
Distribution: fedora core 8, suse 10.3, ubuntu 7.10, kamikaze 7.09
Posts: 515

Rep: Reputation: 30
You could add a default gw for access to all ipīs ( to the router table entry for the eth1 nic (give it an higher metric value then the eth0 has).
But in order to make it work you have to take the eth0 down (by ifdown eth0) before you issue the wake-on-lan command after that eth0 can be reactivated.


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
wake on lan upload-3 Linux - Networking 2 06-12-2006 01:00 PM
wake on lan ampena Debian 3 11-16-2005 06:21 AM
Wake on LAN tommyknocker Linux - Networking 4 07-26-2005 01:26 PM
wake on lan?? alaios Linux - Hardware 2 08-10-2004 01:04 PM
Wake-on-LAN dARkHunTEr Linux - Hardware 0 11-04-2003 04:17 PM > Forums > Linux Forums > Linux - Networking

All times are GMT -5. The time now is 01:30 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
Open Source Consulting | Domain Registration