[c-nsp] Network Address Response

[Ray Burkholder]

> 
> No, I think he's asking why the router with address 10.0.0.5 responds
> to pings that have a destination IP of 10.0.0.4.  The echo request is
> targeted at a network address, not at the router.

Yes, that is the basis for my question.  I suppose to clarify further, a /30
has four addresses:

* network portion
* link ip 1
* link ip 2
* broadcast

Pings to the device originating on the ingress side but destined to the
network portion of the egress side 
are responded to back out the ingress side with the link ip of the ingress
side.

It appears that the router listens to the 'network address' portion of a
subnet.  Is this
good, bad, or ugly?  Should-it/can-it be turned off?

> 
> I've also observed this behavior (more than ICMP though - I have a
> router responding to SNMP and being discovered by our configuration
> management team, on the network address of one of its interfaces) and
> would like to know more about why...
> 

Ah, good, someone else has the same experience.


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