On Thu, 19 Oct 2006, Jeremy Chadwick wrote:
I am absolutely fine with ICMP being prioritised last, but those
scenarios induce more questions; so ICMP is prio'd last, which
would mean the router is busy processing other packets, which could
mean your router is over-utilised either CPU-wise or
This week, at least a dozen troublesome or problematic routes our
NOC has investigated due to customer complaints all have double or
triple digit latencies, jitter and/or packet loss.
Not really that surprising... a normal week when you are looking at the
entire Internet.
What is
On Thu, Oct 19, 2006 at 07:18:01PM -0400, Deepak Jain wrote:
1 NOC (that will remain nameless even though they should really be
shamed) said the following in response to the question -- when we were
trying to diagnose +50ms jumps in their latency within a single POP.
Q: As part of this,
Q: As part of this, can you tell me why your router is prohibiting
packets being sent to our interface?
A: The reason you cannot hit your interface is it is blocked for
security reasons.
[...]
What the heck is going on lately? Have we returned to the time where
we've started trying
template response -- I hear is Well, you can't rely on traceroute
because of ICMP prioritisation. When you start to explain how
traceroute actually works (both ICMP-based and UDP-based (which
still relies on ICMP responses, of course!)), and that ICMP prio
should only affect the IP of which
On Oct 19, 2006, at 10:14 PM, Rubens Kuhl Jr. wrote:
template response -- I hear is Well, you can't rely on traceroute
because of ICMP prioritisation. When you start to explain how
traceroute actually works (both ICMP-based and UDP-based (which
still relies on ICMP responses, of course!)),
Rubens Kuhl Jr. wrote:
If I recall well, Cisco GSRs impose low priority and/or limits for all
ICMP traffic flowing thru the box, not just packets to/from router
itself, and there's not a knob to adjust that.
There'd be no reason to limit ICMP globally -- for traffic through a
router it's all
IIRC, this is not news.
- ferg
-- Rubens Kuhl Jr. [EMAIL PROTECTED] wrote:
template response -- I hear is Well, you can't rely on traceroute
because of ICMP prioritisation. When you start to explain how
traceroute actually works (both ICMP-based and UDP-based (which
still relies on ICMP
