Extreme Slowness

Elijah Savage esavage at digitalrage.org
Fri Oct 27 11:37:37 UTC 2006


Because of contractual issues it makes it very hard for me to  
participate on this list hence the vague original post. I was just  
asking a general question to see if anyone else was having issues. I  
have peering points with Broadwing(now level3), Sprint, AT&T and MCI 
(now Verizon) that I can test for throughput from. This was not just  
about home cable connectivity though when frontline starts to get  
calls I often use wget (very low overhead) to test throughput between  
my sites or to home my home box often times simulating the same sort  
of connectivity that a customer may have. There were customers that  
could not even get to level3.net yesterday which is their home page,  
but it is always nice to get the refresher course on ICMP though :).

As for html posted messages truly my mistake I know better and thank  
you for mentioning it. The new duo core 2 mac mail client which I am  
still trying to get use to under preferences says it is set to plain  
text hmmm something I need to look into.

Thank you

On Oct 27, 2006, at 12:22 AM, Adam Rothschild wrote:

> Elijah,
> On 2006-10-26-16:34:18, Elijah Savage <esavage at digitalrage.org> wrote:
> [HTML mail stripped]
>> It seems anything traversing level3 has very high latency along with
>> what seems overloaded capacity as if they are running in a degraded
>> mode I have connections with Time Warner, AT&T, and MCI [...]
> On 2006-10-26-16:48:15, Elijah Savage <esavage at digitalrage.org> wrote:
> [HTML mail stripped]
>> Say like this traceroute. This is from TW to a Broadwing DS3.
>> 5  tenge-3-2.car1.Cincinnati1.Level3.net (  153.267 ms
>> 207.125 ms
>>     tenge-3-1.car1.Cincinnati1.Level3.net (  218.920 ms
>> 6  ae-5-5.ebr2.Chicago1.Level3.net (  36.976 ms  26.923
>> ms  57.770 ms
>> 7  ge-11-0.core2.Chicago1.Level3.net (  254.145 ms
>>     ge-11-1.core2.Chicago1.Level3.net (  258.522 ms
>>     ge-11-2.core2.Chicago1.Level3.net (  227.223 ms
>> 8  broadwing-level3-oc12.Chicago1.Level3.net (   
>> 231.451 ms
>> 9  so-1-1-0.c1.gnwd.broadwing.net (  53.269 ms  35.568
>> ms  22.511 ms
> Your postings appear to be missing two key pieces of information which
> would help with the community diagnosis requested: source and
> destination IP addresses.  From the information you did provide, one
> can deduce that you're behind a TW/RoadRunner cable modem:
> domain name pointer  
> tenge-3-2.car1.Cincinnati1.Level3.net
> domain name pointer  
> ROADRUNNER.car1.Cincinnati1.Level3.net
> domain name pointer  
> tenge-3-1.car1.Cincinnati1.Level3.net
> domain name pointer  
> ROADRUNNER.car1.Cincinnati1.Level3.net
> Now, the jitter and high latency you're seeing could be a result of
> one or more factors, including but not limited to RF/plant issues, TWC
> running their transport and/or Level(3) transit hot (which seems to be
> a common occurrence these days), ECMP across two circuits of uneven
> loading, or your neighbor might be jacking wifi and downloading a
> bunch of torrents -- we, the readers, just don't know.
> Of note when performing armchair troubleshooting across Level(3)'s
> network: the 'ebr's (PTR record of ebr*.{pop}.level3.net == Force10
> E1200; Experimental Backbone Router?) tend to drop a lot of diagnostic
> traffic (such as, say, 'ping' and 'traceroute') as a part of overly
> aggressive control-plane policers.  This loss is, of course, strictly
> cosmetic, and has no bearing on end-to-end performance.  Hence, the
> old "to it, not through it" rule applies.
> smokeping[1] and iperf[2] (to end hosts) are your friends.
> As an aside, I've noticed your string of postings today were all
> HTML-tagged.  While not expressly forbidden (or even discouraged) by
> the current Mailing List AUP, this is generally regarded as bad form;
> you might wish to reconfigure your mail client accordingly...
> Hope this helps,
> -a
> [1] <http://oss.oetiker.ch/smokeping/>
> [2] <http://dast.nlanr.net/Projects/Iperf/>

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