[j-nsp] j-series and clusterip / multicast mac addresses

Stefan Fouant sfouant at gmail.com
Tue May 6 17:22:07 EDT 2008

Not really sure but I would think that even with or without IGMP/PIM
enabled on the interface, the router probably doesn't know what to do
with that packet since it doesn't have corresponding IGMP/PIM join
state to match the incoming packet.  Therefore any packets sourced
from a multicast mac address are probably pitched in the bit bucket.
at least that seems to make sense since you've indicated that static
arp entries are working...

Just my $.02.

Stefan Fouant

On Tue, May 6, 2008 at 4:55 PM, seph <seph at directionless.org> wrote:
> I'm playing with linux's ClusterIP behind a couple of j2320 routers. It
> works by having several machines share an ip address using a multicast
> mac address. However, my j2320's don't seem to like it.
> tcpdump shows they as sending an arp request, and ignoring the arp
> response. If I statically assign an arp entry, things do work, but I need
> to dynamically learn them. I don't think I have multicast enabled, but
> when I tried enabling it I saw the same behavior.
> Currently running junos 9.0r2.
> Anyone have advice on how to do this?
> seph
> _______________________________________________
> juniper-nsp mailing list juniper-nsp at puck.nether.net
> https://puck.nether.net/mailman/listinfo/juniper-nsp

More information about the juniper-nsp mailing list