Re: [CODE4LIB] Domain lookup madness
On Wednesday, November 9, 2011, Roy Tennant wrote: > Posting here worked, but you probably should have skipped the tearing > out of the hair. When you get to be my age, you'll miss it. A lot. ;-) http://www.theonion.com/articles/report-male-hair-loss-7-times-more-painful-than-ch,21194/ -Ross. > Roy > > On Wed, Nov 9, 2011 at 1:39 PM, Yitzchak Schaffer > wrote: >> On 11/09/2011 16:33, Roy Tennant wrote: >>> >>> OCLC staff says "We changed the way questionpoint.org DNS resolution >>> was performed last night and the graceful handling of IPv6 lookups was >>> inadvertently left off. That has been corrected so please try again. >> >> Confirmed working. For once I shoulda talked to the vendor before tearing >> out my hair and posting to code4lib :) >> >> -- >> Yitzchak Schaffer >> Systems Manager >> Touro College Libraries >> 212.742.8770 ext. 2432 >> http://www.tourolib.org/ >> >> Access Problems? Contact systems.libr...@touro.edu >> >
Re: [CODE4LIB] Domain lookup madness
Posting here worked, but you probably should have skipped the tearing out of the hair. When you get to be my age, you'll miss it. A lot. ;-) Roy On Wed, Nov 9, 2011 at 1:39 PM, Yitzchak Schaffer wrote: > On 11/09/2011 16:33, Roy Tennant wrote: >> >> OCLC staff says "We changed the way questionpoint.org DNS resolution >> was performed last night and the graceful handling of IPv6 lookups was >> inadvertently left off. That has been corrected so please try again. > > Confirmed working. For once I shoulda talked to the vendor before tearing > out my hair and posting to code4lib :) > > -- > Yitzchak Schaffer > Systems Manager > Touro College Libraries > 212.742.8770 ext. 2432 > http://www.tourolib.org/ > > Access Problems? Contact systems.libr...@touro.edu >
Re: [CODE4LIB] Domain lookup madness
On 11/09/2011 16:33, Roy Tennant wrote: OCLC staff says "We changed the way questionpoint.org DNS resolution was performed last night and the graceful handling of IPv6 lookups was inadvertently left off. That has been corrected so please try again. Confirmed working. For once I shoulda talked to the vendor before tearing out my hair and posting to code4lib :) -- Yitzchak Schaffer Systems Manager Touro College Libraries 212.742.8770 ext. 2432 http://www.tourolib.org/ Access Problems? Contact systems.libr...@touro.edu
Re: [CODE4LIB] Domain lookup madness
On Wed, Nov 9, 2011 at 4:18 PM, Jeff Godin wrote: > > The nameservers for questionpoint.org appear to not respond to queries > for records. Expected behavior would be to return an empty > response. A minor correction: The nameservers seem to respond to queries for records, but some large recursive resolvers are returning SERVFAIL (after what appears to be a timeout). Tried Google's 8.8.8.8, Linode's 207.192.69.4 (as a customer). Both return SERVFAIL. Linode's 207.192.69.5 and 97.107.133.4 return the expected empty response -- and quickly. I'm guessing that something is broken in an intermittent way, or a change was made recently. What I don't know is if it's slowly being fixed, or slowly breaking. :-) -jeff
Re: [CODE4LIB] Domain lookup madness
OCLC staff says "We changed the way questionpoint.org DNS resolution was performed last night and the graceful handling of IPv6 lookups was inadvertently left off. That has been corrected so please try again. Roy > > -- Forwarded message -- > From: Jeff Godin > Date: Wed, Nov 9, 2011 at 1:18 PM > Subject: Re: [CODE4LIB] Domain lookup madness > To: CODE4LIB@listserv.nd.edu > > > On Wed, Nov 9, 2011 at 3:47 PM, Yitzchak Schaffer > wrote: >> >> yitzchas@ubu-dev:/www/websites/drupal/sites/all$ curl >> > "http://www.questionpoint.org/crs/servlet/org.oclc.chat.QPWOnlineStatus? > library=10253&rid=0" >> -m 3 -v >> * name lookup timed out >> * Couldn't resolve host 'www.questionpoint.org' >> * Closing connection #0 >> curl: (6) name lookup timed out > > The nameservers for questionpoint.org appear to not respond to queries > for records. Expected behavior would be to return an empty > response. > > curl is trying to look up both the A and the records, and the > system resolver's timeout is larger than 3 seconds, so curl times out. > Dropping the -m3 would let curl complete, but it would take about 15 > seconds. > > If you pass -4 as an option to curl, this should work around the issue > by skipping the IPv6 lookup. > > If using libcurl in php, you should be able to use the CURL_IPRESOLVE_V4 > option. > > I don't know offhand if file_get_contents can be instructed to force > IPv4. > > Another option, since I believe all of the above use the libc resolver > library -- you can hardcode the IPv4 address in /etc/hosts -- that > will break when the IP changes. > > There are a few other possible workarounds, but hopefully one of the > above works acceptably. > > -jeff > > >
Re: [CODE4LIB] Domain lookup madness
On Wed, Nov 9, 2011 at 4:33 PM, Roy Tennant wrote: > OCLC staff says "We changed the way questionpoint.org DNS resolution > was performed last night and the graceful handling of IPv6 lookups was > inadvertently left off. That has been corrected so please try again. Aha! That would explain it. Thanks! -jeff
Re: [CODE4LIB] Domain lookup madness
On Wed, Nov 9, 2011 at 3:47 PM, Yitzchak Schaffer wrote: > > yitzchas@ubu-dev:/www/websites/drupal/sites/all$ curl > "http://www.questionpoint.org/crs/servlet/org.oclc.chat.QPWOnlineStatus?library=10253&rid=0"; > -m 3 -v > * name lookup timed out > * Couldn't resolve host 'www.questionpoint.org' > * Closing connection #0 > curl: (6) name lookup timed out The nameservers for questionpoint.org appear to not respond to queries for records. Expected behavior would be to return an empty response. curl is trying to look up both the A and the records, and the system resolver's timeout is larger than 3 seconds, so curl times out. Dropping the -m3 would let curl complete, but it would take about 15 seconds. If you pass -4 as an option to curl, this should work around the issue by skipping the IPv6 lookup. If using libcurl in php, you should be able to use the CURL_IPRESOLVE_V4 option. I don't know offhand if file_get_contents can be instructed to force IPv4. Another option, since I believe all of the above use the libc resolver library -- you can hardcode the IPv4 address in /etc/hosts -- that will break when the IP changes. There are a few other possible workarounds, but hopefully one of the above works acceptably. -jeff
Re: [CODE4LIB] Domain lookup madness
On 11/09/2011 16:03, Chad Benjamin Nelson wrote: I upped it to ten and it still failed, but when I dropped the "-m 3" it does return the same as the browser. So it's just real slow, that's all. When I use dig to resolve it, it's as good as instantaneous (from my human perspective). That's what I don't understand. -- Yitzchak Schaffer Systems Manager Touro College Libraries 212.742.8770 ext. 2432 http://www.tourolib.org/ Access Problems? Contact systems.libr...@touro.edu
Re: [CODE4LIB] Domain lookup madness
On 11/09/2011 16:01, Michael Della Bitta wrote: Have you tried running dig or nslookup on the server from the command line? Maybe your server is using DNS that is broken or has cached a bad record. Look again at my msg ;) that's the mystifying part yitzchas@ubu-dev:/www/websites/drupal/sites/all$ dig www.questionpoint.org +short 132.174.11.16 yitzchas@ubu-dev:/www/websites/drupal/sites/all$ curl "http://www.questionpoint.org/crs/servlet/org.oclc.chat.QPWOnlineStatus?library=10253&rid=0"; -m 3 -v * name lookup timed out * Couldn't resolve host 'www.questionpoint.org' * Closing connection #0 curl: (6) name lookup timed out
Re: [CODE4LIB] Domain lookup madness
It's setting the timeout I upped it to ten and it still failed, but when I dropped the "-m 3" it does return the same as the browser. So it's just real slow, that's all. Chad Nelson Web Services Programmer University Library Georgia State University e: cnelso...@gsu.edu t: 404 413 2771 My Calendar From: Code for Libraries [CODE4LIB@LISTSERV.ND.EDU] on behalf of Yitzchak Schaffer [yitzchak.schaf...@gmx.com] Sent: Wednesday, November 09, 2011 3:47 PM To: CODE4LIB@LISTSERV.ND.EDU Subject: [CODE4LIB] Domain lookup madness Hello all, Mystified. A drupal module on our site makes a call to an OCLC server to get status of chat service. This has been working fine until this morning. I can open a browser and successfully browse the URL of the status service. But when I use file_get_contents() or php-curl (or command-line curl for that matter), on the same box, I get a domain lookup error, see below. What the heck is going on? TIA! yitzchas@ubu-dev:/www/websites/drupal/sites/all$ dig www.questionpoint.org +short 132.174.11.16 yitzchas@ubu-dev:/www/websites/drupal/sites/all$ curl "http://www.questionpoint.org/crs/servlet/org.oclc.chat.QPWOnlineStatus?library=10253&rid=0"; -m 3 -v * name lookup timed out * Couldn't resolve host 'www.questionpoint.org' * Closing connection #0 curl: (6) name lookup timed out -- Yitzchak Schaffer Systems Manager Touro College Libraries 212.742.8770 ext. 2432 http://www.tourolib.org/ Access Problems? Contact systems.libr...@touro.edu
Re: [CODE4LIB] Domain lookup madness
Yitzchak, Have you tried running dig or nslookup on the server from the command line? Maybe your server is using DNS that is broken or has cached a bad record. Michael Della Bitta Senior Applications Developer Information Technology Group The New York Public Library 40 West 20th Street, 5th Floor New York, NY 10011-4211 (212) 621-0609 On Wed, Nov 9, 2011 at 3:47 PM, Yitzchak Schaffer wrote: > Hello all, > > Mystified. A drupal module on our site makes a call to an OCLC server to get > status of chat service. This has been working fine until this morning. > > I can open a browser and successfully browse the URL of the status service. > But when I use file_get_contents() or php-curl (or command-line curl for > that matter), on the same box, I get a domain lookup error, see below. What > the heck is going on? TIA! > > yitzchas@ubu-dev:/www/websites/drupal/sites/all$ dig www.questionpoint.org > +short > 132.174.11.16 > > yitzchas@ubu-dev:/www/websites/drupal/sites/all$ curl > "http://www.questionpoint.org/crs/servlet/org.oclc.chat.QPWOnlineStatus?library=10253&rid=0"; > -m 3 -v > * name lookup timed out > * Couldn't resolve host 'www.questionpoint.org' > * Closing connection #0 > curl: (6) name lookup timed out > > -- > Yitzchak Schaffer > Systems Manager > Touro College Libraries > 212.742.8770 ext. 2432 > http://www.tourolib.org/ > > Access Problems? Contact systems.libr...@touro.edu >
Re: [CODE4LIB] Domain lookup madness
Roy Tennant writes > I'm mystified as well, since a curl request from one of my servers > (not an OCLC one) resolves just fine. I get the same result as Yitzchak krichel@sahure:~$ curl "http://www.questionpoint.org/crs/servlet/org.oclc.chat.QPWOnlineStatus?library=10253&rid=0"; -m 3 -v * name lookup timed out * Couldn't resolve host 'www.questionpoint.org' * Closing connection #0 curl: (6) name lookup timed out Cheers, Thomas Krichelhttp://openlib.org/home/krichel http://authorprofile.org/pkr1 skype: thomaskrichel
Re: [CODE4LIB] Domain lookup madness
Yitzchak, I'm mystified as well, since a curl request from one of my servers (not an OCLC one) resolves just fine. Roy On Wed, Nov 9, 2011 at 12:47 PM, Yitzchak Schaffer wrote: > Hello all, > > Mystified. A drupal module on our site makes a call to an OCLC server to get > status of chat service. This has been working fine until this morning. > > I can open a browser and successfully browse the URL of the status service. > But when I use file_get_contents() or php-curl (or command-line curl for > that matter), on the same box, I get a domain lookup error, see below. What > the heck is going on? TIA! > > yitzchas@ubu-dev:/www/websites/drupal/sites/all$ dig www.questionpoint.org > +short > 132.174.11.16 > > yitzchas@ubu-dev:/www/websites/drupal/sites/all$ curl > "http://www.questionpoint.org/crs/servlet/org.oclc.chat.QPWOnlineStatus?library=10253&rid=0"; > -m 3 -v > * name lookup timed out > * Couldn't resolve host 'www.questionpoint.org' > * Closing connection #0 > curl: (6) name lookup timed out > > -- > Yitzchak Schaffer > Systems Manager > Touro College Libraries > 212.742.8770 ext. 2432 > http://www.tourolib.org/ > > Access Problems? Contact systems.libr...@touro.edu >
[CODE4LIB] Domain lookup madness
Hello all, Mystified. A drupal module on our site makes a call to an OCLC server to get status of chat service. This has been working fine until this morning. I can open a browser and successfully browse the URL of the status service. But when I use file_get_contents() or php-curl (or command-line curl for that matter), on the same box, I get a domain lookup error, see below. What the heck is going on? TIA! yitzchas@ubu-dev:/www/websites/drupal/sites/all$ dig www.questionpoint.org +short 132.174.11.16 yitzchas@ubu-dev:/www/websites/drupal/sites/all$ curl "http://www.questionpoint.org/crs/servlet/org.oclc.chat.QPWOnlineStatus?library=10253&rid=0"; -m 3 -v * name lookup timed out * Couldn't resolve host 'www.questionpoint.org' * Closing connection #0 curl: (6) name lookup timed out -- Yitzchak Schaffer Systems Manager Touro College Libraries 212.742.8770 ext. 2432 http://www.tourolib.org/ Access Problems? Contact systems.libr...@touro.edu
