For anyone interested, after finding a blurb on a blog saying basically
that multi-homing is not supported on RHEL6 except in a bonding config,
we changed to virtual interfaces.
eth0 is still eth0
but
eth1 is now eth0:0
eth2 is now eth0:1
and so-forth.
Thank you for the reply.
eric
On 04/19/2011 04:00 PM, Mark Post wrote:
On 4/19/2011 at 01:58 PM, "Eric K. Dickinson"<[email protected]> wrote:
During the install and/or configuration of the 2nd, 3rd....
interface everything works just fine.
We can reach each adapter individually by IP address.
Then we reboot.
From that point we can see the traffic (tcpdump) arriving
at each interface but it never replies.
What are we missing? What do you need to see?
I would check the contents of any file named rp_filter under /proc. Here's a
list from my laptop:
/proc/sys/net/ipv4/conf/all/rp_filter
/proc/sys/net/ipv4/conf/default/rp_filter
/proc/sys/net/ipv4/conf/lo/rp_filter
/proc/sys/net/ipv4/conf/eth0/rp_filter
/proc/sys/net/ipv4/conf/wlan0/rp_filter
/proc/sys/net/ipv4/conf/pan0/rp_filter
If they're set to 1, most likely your seeing "martian" messages in your system
log. At that point, you have a choice:
1. Set them all to 0, using /etc/sysctl.conf. This is not preferred, since
rp_filter provides some additional protection against spoofing.
2. Set up your routing properly and don't try to access any interface from any
subnet.
3. Set up advanced routing policies to handle being able to respond to any
subnet from any interface.
Mark Post
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