On 06/02/2011 06:16 PM, Jeremy Chadwick wrote:
...
Commercial-grade routers (read: Cisco, Juniper) all implement a form of
ICMP prioritisation. The router can (and will) discard/drop inbound
ICMP packets directed at the router itself (e.g. a destination IP of the
gateway) during high CPU utilisation. Packets destined to a router
itself (e.g. destination IP is the router) are handled very, very
differently.
This is why network engineers always recommend that when testing for
network anomalies, the client (source IP) should attempt to speak to a
web server, another box, whatever -- anything as long as it's not a
router -- for its destination IP.
An easier solution: Use a freeBSD box as your router! I *heart* Quagga. ;)
Friday!
Rudy
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