Re: Broadcast pings.

[Paul Ferguson <ferguson () cisco com>]

At 05:32 PM 12/23/97 -0600, Phil Howard wrote:

> When a packet arrives, take note of the interface and gateway it came from.
> Check the route tables for where a reply to this packet could be delivered.
> Don't choose only the best route, but compare where the packet came from
> with all valid reply routes (except broad defaults larger than a certain
> size that can be configured).  If the packet came from where it is valid
> to reply, then allow the packet to proceed.  If not, then discard it (an
> ICMP probably won't make it back to the right place anyway).

Yes. Some of us call this 'unicast RPF'.

Your point is well taken.  ;-)

- paul