[j-nsp] ex4200 static arp

[Derick Winkworth]

It is also how checkpoint firewalls work in a multicast cluster... 
Except they don't reply to arps with a multicast address...  I believe
the requirement is that you have to create a static arp entry.

The issue with JUNOS is that a static arp entry (even one with a
mutlicast mac address) can only be tied to a single interface... it
would be more useful if it could mapped to multiple interfaces or a
whole VLAN.

Adam C. Greenfield wrote:
> On Mon, Jan 19, 2009 at 11:45 AM, Ross Vandegrift <ross at kallisti.us> wrote:
>   
>> Maybe there's a use-case I'm not aware of, but when would you want all
>> of your active devices to receive all traffic?  I'd want each active
>> device to receive 1/n of the packets, and so would use something like
>> equal-cost routes.
>>
>> But maybe you have some active-active setup in mind that doesn't split
>> the traffic?
>>
>>     
>
> Not a use case I am quick to defend, but it is worth mentioning that
> this appears to be how Windows Server 2008/IIS 7 "clusters" work. The
> servers in the cluster reply to ARP queries for the "shared IP" with a
> MAC address that is never used to originate traffic - thus causing
> traffic to the shared IP to be broadcast to all hosts in the collision
> domain because it is never added to layer 2 MAC tables.
>
> -Adam
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