Router setup

[sawan]

I have the followng setup

source-router-router-destination

connected by cross cables..

both routers have 2 NICs and have ipv4 and ipv6 addresses assigned.. source and router being in different networks... routers are running on FC3

now the problem is that when promiscous mode is eabled on the routers then ping6 works other it doesnt..

What could be the reason....

[Dolda2000]

I'm not completely certain now, but considering how it helps by enabling promiscuous mode, I'd say it's probably a broken NIC. IPv6 makes pretty hard use of Ethernet multicasting, so if one of the NICs has a broken H/W MAC filter (or, alternatively, is using a Linux driver which doesn't support its multicasting capabilities), it's probably rather likely to cause a problem like this.

[sawan]

How do I know whether the Linux driver supports multicasting capabilities or not?

I am a newbie, just experimenting with the things.

Thanks for helping...

[Dolda2000]

Well... that's hard. =)

You can begin by checking your NICs against the file Documentation/networking/multicast.txt, which is in the kernel source tree. That file is probably not complete, though.

Are all the NICs the same model, or are they of different models/brands?

[sawan]

The problem got solved...

by adding IPV6INIT=yes
in /etc/sysconfig/network-scripts/ifcfg-eth0

and adding IPV6AUTOCONF=no
in /etc/sysconfig/network


Thanks everyone for helping...