dslreports logo
site
 
    All Forums Hot Topics Gallery
spc

spacer




how-to block ads


Search Topic:
uniqs
6
share rss forum feed

dtherbert

join:2009-04-24
Evanston, IL
reply to NormanS

Re: [Connectivity] Latency Issue

I will do these things you suggest.

To answer your question about pinging an intermediary router, I thought I would try pinging the addresses listed in the trace, starting with my router, then the modem (not listed, at 192.168.100.1), then beyond, to see if I got spikes anywhere. It happened that the first address listed after my router showed these ping spikes, so I didn't try any further ones since I thought that was where the problem was. Isn't the fact that I'm getting a response mean that it is responding to ICMP, or is my reasoning flawed (timeouts/spikes due to low-priority or something like that)?

Anyway, thank you for the response, I'll post the new information after I get home later.



NormanS
I gave her time to steal my mind away
Premium,MVM
join:2001-02-14
San Jose, CA
kudos:11
Reviews:
·SONIC.NET
·Pacific Bell - SBC

Many routers are programmed to give low priority to diagnostic packets directed at them. Their primary job is forwarding TCP/IP traffic up the path. Response to diagnostics, unlike routing through, requires processor time; which may cause throughput delays if the router is 100% responsive to ICMP, and the like.
--
Norman
~Oh Lord, why have you come
~To Konnyu, with the Lion and the Drum


dtherbert

join:2009-04-24
Evanston, IL

Is there a recommendation for a Mac-compatible alternative to PingPlotter?



NormanS
I gave her time to steal my mind away
Premium,MVM
join:2001-02-14
San Jose, CA
kudos:11
Reviews:
·SONIC.NET
·Pacific Bell - SBC

said by dtherbert:

Is there a recommendation for a Mac-compatible alternative to PingPlotter?

Maybe Smokeping, though I don't know how to interpret the results.
--
Norman
~Oh Lord, why have you come
~To Konnyu, with the Lion and the Drum

devnuller

join:2006-06-10
Cambridge, MA
reply to dtherbert

said by dtherbert:

Is there a recommendation for a Mac-compatible alternative to PingPlotter?

mtr - »www.bitwizard.nl/mtr/

dtherbert

join:2009-04-24
Evanston, IL

Thanks devnuller, I'll check that out.

Also, I've been running smokeping for awhile now, see link:

»/r3/smokeping.···99f40735

Anybody care to interpret the results?

I'm definitely seeing some packet loss, on the order of a few percentage points. Also, the period on the graphs corresponding to 8:30PM-midnight, I was streaming Netflix for a good portion of that time, and it seems to have dropped a few more packets, and the pings were definitely less consistent (I probably should have prioritized ICMP packets on my router).