Extreme Slowness

Jeremy Chadwick nanog at jdc.parodius.com
Thu Oct 26 23:55:55 UTC 2006

On Thu, Oct 26, 2006 at 06:01:43PM -0400, Elijah Savage wrote:
> For FYI :) I realize that ICMP is not the best way to test and it is  
> not a true indication of slowness or the presence of a problem.

Which begs the same question I've asked in the recent past: then
what *is* a good diagnostic tool?  If ICMP "is not the best way to
test", then what is?  What other globally-implemented layer 3 or
below protocols do we have available for troubleshooting?

Sure, UDP-based traceroute still relies on ICMP TTL exceeded
responses to work.  I've no idea what TCP traceroute relies on,
as I haven't looked at it.

| Jeremy Chadwick                                 jdc at parodius.com |
| Parodius Networking                        http://www.parodius.com/ |
| UNIX Systems Administrator                   Mountain View, CA, USA |
| Making life hard for others since 1977.               PGP: 4BD6C0CB |

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