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Old 03-10-2008, 01:18 PM   #1
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Unhappy VT6120 Gigabit Ethernet Adapter not passing multicast traffic


I have a VIA motherboard here with a VT6120 Gigabit Ethernet Adapter (onboard). This is the strangest thing:

I do a CentOS 5.x install and run the yum -y update - (I can list all of the packages in my kickstart file if need be) and I reboot once the install is completed ( of course)

Now, the application that I am running on it needs to pass multicast traffic on tcp ports 5000 and 5001.

I don't see any m-cast traffic UNTIL I run wireshark, tcpdump , tshark , or some other sniffing tool. So, I think that the key here is once the eth0 is put in promiscuous mode, I see multicast traffic.

It still works after I reboot, shut down , log out , whatever.

No firewall, SELinux is disabled on boot.

Anyone see anything like this before?


Old 03-11-2008, 10:41 AM   #2
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Angry Same Topic - different question

I figured out what was wrong - apparently , this adapter , does not pass multicast traffic by default. If I re-initalise this adapter using the

ifconfig eth0 allmulti

It will then pass multicast traffic - so, on that note, does anyone know what setting I can put in the ifcfg-eth0 config file to enable this always?


Old 03-17-2008, 01:04 PM   #3
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Cool I have a workaround

It is kind of a hack - but it seems to work:

I created a startup script to 'bounce' the card into ALLMULTI and then back out again:

start() {

/sbin/ifconfig eth0 allmulti
/sbin/ifconfig eth0 -allmulti

This I have to do when the machine boots - until I find a better solution , this will have to do.

I have this set to run in runlevel 3 4 and 5



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