Date: Tue, 14 Mar 2006 12:35:22 -0800
From: Matthew Jarvis <[EMAIL PROTECTED]>
...
Larry's Rough Diagnostic Checklist
for slow internet. AKA "The Internet is slow, fix it."
1. is it DNS?
Hints or links on diagnosing DNS problems?
That's a BIG topic --I'll limit my comment to the slow/fast issue:
w/o looking at the source code(*) of ping (or traceroute), I'd assume it
resolves (DNS) to the destination only once; then it fires the packets (as
you may have defined them with extended options --hint, hint :-)
So the 'ping' times reported don't contain DNS overhead.
(*) You don't need to look at source code -- You can watch above with a
network sniffer, like ethereal --interesting, but doesn't go beyond your
LAN.
In a limited test on DNS influence you would point your application to the
IP quad, not the domain name. (as I said limited)
- Horst
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