08-14-2003 4:15pm Onwards, Continent wide power issues

ZeroFill · Post by **ZeroFill** » Tue Aug 19, 2003 3:28 pm

yes, they all take ~10sec

Post by **porcupine** » Tue Aug 19, 2003 3:32 pm

ZeroFill wrote:yes, they all take ~10sec

Yeah,

I'm seeing an almost instant resolve of your DNS here, but thats because we've been checking on and off for the last day, it's definatly cached by now. I've run out of new servers to check through, but basically once your ISP stops taking 12 seconds to resolve your RDNS from external queries, your ftp will stop taking 12+ seconds to connect.

This shouldn't affect any other performance (eg files will transfer fast still, etc.), and is most likely related to your power (I know Cogeco's servers have been flooded since this power issue, our own RDNS for my home cable has been noticably slower as they're performing a load of system maintenance, etc.).

ZeroFill · Post by **ZeroFill** » Tue Aug 19, 2003 6:16 pm

i doubt we have a power issue as i am on the west coast -- we werent affected by the power.

what can i tell my isp to fix this problem? i'm not sure if they will even look into it because all other ftps work instantly. i still dont know why other ftp servers connect instantly but prioritycolo's takes 12 secs. (it's hard to believe it is my isp because other ftp servers work fine)

also, like you said, my ip is cached, so why does it take a long time to log in?

Post by **porcupine** » Tue Aug 19, 2003 7:26 pm

ZeroFill wrote:i doubt we have a power issue as i am on the west coast -- we werent affected by the power.

what can i tell my isp to fix this problem? i'm not sure if they will even look into it because all other ftps work instantly. i still dont know why other ftp servers connect instantly but prioritycolo's takes 12 secs. (it's hard to believe it is my isp because other ftp servers work fine)

also, like you said, my ip is cached, so why does it take a long time to log in?

Ahh ok, my bad for making assumptions.

Simply state to your ISP that external servers are taking over 5 seconds to do RDNS lookups on your IP address, and you want to know why. Theres no 100% certainty I'm right on this one mind you, but I don't see anything else causing this slowdown, and it's the co-relation you have with the snickers.org box (which also took over 10 seconds to do a RDNS lookup).

I'm uncertain if ProFTPD takes IP cache into consideration when it does lookups, I know little about the internal workings of the program other then what it logs, thus it's arguable that it may use IP cache, or may not, I honestly couldn't tell you.

ZeroFill · Post by **ZeroFill** » Tue Aug 19, 2003 9:46 pm

i don't own snickers.org

Post by **porcupine** » Tue Aug 19, 2003 9:49 pm

ZeroFill wrote:i don't own snickers.org

No, Neither do I. We use several servers on and off our network to test out when people have problems, this is one of them.

ZeroFill · Post by **ZeroFill** » Tue Aug 19, 2003 9:52 pm

i tried doing the time host thing again on another shell i have and these are my results.

18:49:46 lawicdco:~
$ time host 24.205.164.195
195.164.205.24.IN-ADDR.ARPA domain name pointer 24-205-164-195.wc-eres.charterpipeline.net

real 0m0.138s
user 0m0.000s
sys 0m0.003s
18:50:03 lawicdco:~
$ time host 24.205.164.195
195.164.205.24.IN-ADDR.ARPA domain name pointer 24-205-164-195.wc-eres.charterpipeline.net

real 0m0.002s
user 0m0.000s
sys 0m0.002s

why would it take 10sec off your box, yet .138sec off another box? the other shell i tested this has no relation to my isp. how could i convince my isp into looking into the problem if i cannot reproduce the lag off a 3rd party box? i'm starting to think there's a link/router problem from the US to your location.

[edit]
ok. now this is really confusing. that 3rd party box connects to you fine

18:57:22 lawicdco:~
$ time ftp www5.pcdc.net

220 ProFTPD 1.2.8 Server (ProFTPD) [66.11.162.63]
Name (www5.pcdc.net:lawicdco): ^C
real 0m1.161s
user 0m0.000s
sys 0m0.003s

and yet i cannot reproduce the 10sec lag to my home box. arg!!!

KungPaoChicken · Post by **KungPaoChicken** » Tue Aug 19, 2003 10:10 pm

I also am having the same issues as ZeroFill. To logon it takes a good 10 seconds before i get a response. Im pretty shure i have a differnt isp then Mr.ZeroFill so id assume that isnt not a problem on our side.

Post by **porcupine** » Tue Aug 19, 2003 10:14 pm

Thats exactly what makes troubleshooting a problem like this so difficult, and why you may get varrying results. We test from 3-4 servers, one internal, the rest external, and base our conclusions on that, often they're right, sometimes they're totally wrong. Best case suggestion, wait and see if it disappears, I don't believe we changed anything before, I think it just went away on it's own did it not?

ZeroFill · Post by **ZeroFill** » Tue Aug 19, 2003 10:19 pm

yeah, the login-lag did seem to just dissapear but this was fixed after you posted the complete switch over to istop or peer1. are the routers still configured the same way it was before the blackout?

i thought it was the switchover that fixed the login-lag and that new configuration w/ the routers et-all mitigated the problem.

Post by **porcupine** » Tue Aug 19, 2003 10:24 pm

ZeroFill wrote:yeah, the login-lag did seem to just dissapear but this was fixed after you posted the complete switch over to istop or peer1. are the routers still configured the same way it was before the blackout?

i thought it was the switchover that fixed the login-lag.

Not too likely. The routers are being tweaked 24x7, but your login process is no different from download. If you had a poor route to us, you'd see it with everything you do, uploads/downloads would go dead slow, email would take 20+ seconds to retrieve, traceroutes would be horrid, etc. It's not a routing issue, as you'd be complaining about a lot more before your FTP login took 10 seconds to login.