 funchordsHelloPremium,MVM
join:2001-03-11
Yarmouth Port, MA
kudos:5
1 edit | What's going on when you have 8000 ms. pings+zero drops?See the output in the thread that started it all is here: »www.postel.org/pipermail/end2end···tml#7742 and the rabble-rouser is David P. Reed (a deeply respected network God).
$ ping lcs.mit.edu
PING lcs.mit.edu (128.30.2.121) 56(84) bytes of data.
64 bytes from zermatt.csail.mit.edu (128.30.2.121): icmp_seq=1 ttl=44
time=6330 ms
64 bytes from zermatt.csail.mit.edu (128.30.2.121): icmp_seq=2 ttl=44
time=6005 ms
64 bytes from zermatt.csail.mit.edu (128.30.2.121): icmp_seq=3 ttl=44
time=8509 ms
64 bytes from zermatt.csail.mit.edu (128.30.2.121): icmp_seq=4 ttl=44
time=9310 ms
64 bytes from zermatt.csail.mit.edu (128.30.2.121): icmp_seq=5 ttl=44
time=8586 ms
64 bytes from zermatt.csail.mit.edu (128.30.2.121): icmp_seq=6 ttl=44
time=7765 ms
64 bytes from zermatt.csail.mit.edu (128.30.2.121): icmp_seq=7 ttl=44
time=7168 ms
64 bytes from zermatt.csail.mit.edu (128.30.2.121): icmp_seq=8 ttl=44
time=10261 ms
64 bytes from zermatt.csail.mit.edu (128.30.2.121): icmp_seq=9 ttl=44
time=10624 ms
64 bytes from zermatt.csail.mit.edu (128.30.2.121): icmp_seq=10 ttl=44
time=9625 ms
64 bytes from zermatt.csail.mit.edu (128.30.2.121): icmp_seq=11 ttl=44
time=9725 ms
64 bytes from zermatt.csail.mit.edu (128.30.2.121): icmp_seq=12 ttl=44
time=8725 ms
64 bytes from zermatt.csail.mit.edu (128.30.2.121): icmp_seq=13 ttl=44
time=9306 ms
64 bytes from zermatt.csail.mit.edu (128.30.2.121): icmp_seq=14 ttl=44
time=8306 ms
It's interesting -- there's 10 seconds of RTT delay yet not one dropped packet.
Please read the thread for a long list of possible explanations, much too much to sum up here.
--
Robb Topolski -= funchords.com =- District of Columbia -- KJ7RL
Test your Broadband connection today! -- »measurementlab.net/ |
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 N3OGHYo Soy Col. "Bat" GuanoPremium
join:2003-11-11
Philly burbs
kudos:1 | AT&T, your packet, Delivered:
time=9300ms
AT&T, your packet, Delivered:
time=9320ms
--
Petty people are disproportionably corrupted by petty power… |
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 NetFixerFreedom is NOT freePremium
join:2004-06-24
The 'Boro
 ·Vonage
 ·Cingular Wireless
 ·Comcast
 ·AT&T Southeast
| reply to funchords
That is some terrible lag you have in DC. Maybe you should move out into the hinterlands. 
Here is a ping to the same host from a bluetooth connection to my cell phone (connected to an AT&T WCDMA 3G tower):
Pinging lcs.mit.edu [128.30.2.121] with 32 bytes of data:
Reply from 128.30.2.121: bytes=32 time=1391ms TTL=40
Reply from 128.30.2.121: bytes=32 time=276ms TTL=40
Reply from 128.30.2.121: bytes=32 time=530ms TTL=40
Reply from 128.30.2.121: bytes=32 time=203ms TTL=40
Reply from 128.30.2.121: bytes=32 time=178ms TTL=40
Reply from 128.30.2.121: bytes=32 time=268ms TTL=40
Reply from 128.30.2.121: bytes=32 time=212ms TTL=40
Reply from 128.30.2.121: bytes=32 time=180ms TTL=40
Reply from 128.30.2.121: bytes=32 time=189ms TTL=40
Reply from 128.30.2.121: bytes=32 time=200ms TTL=40
Ping statistics:
Packets: Sent = 10, Received = 10, Lost = 0 (0% loss)
Minimum = 178ms, Maximum = 1391ms, Average = 362ms
Certainly not as good as my DSL connection, but no 8-10 second delays either.
--
History does not long entrust the care of freedom to the weak or the timid.
-- Dwight D. Eisenhower
The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants.
-- Thomas Jefferson |
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funchordsHelloPremium,MVM
join:2001-03-11
Yarmouth Port, MA
kudos:5 | actually, the output in my post was from David Reed in Chicago. |
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 NerdtalkerWorking Hard, Or Hardly Working?Premium,MVM
join:2003-02-18
Tucson, AZ | reply to funchords
I still tend to lend the data credence myself.
As soon as I read "bimodal distribution" I thought "A-Ha! Finally someone who sees the same thing I do!"
Honestly, half the time I see either something between 2-8 seconds, or the (as expected) ~200ms latency.
Something is definitely wonky.
--
"Some people never see the light till it shines thru bullet holes." -Bruce Cockburn
I'm testing Gmail's spam filters: Broadbandreports1@gmail.com
Spam: 12900+ messages currently using 406 MB. |
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