# IPv6 Issues / Question **URL:** \ **Category:** NGINX\ **Created:** [May 13, 2011, 8:54pm UTC](https://www.ruby-forum.com/t/ipv6-issues-question/206945 "2011-05-13T20:54:55Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![dubstep](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/cdc98d/32.png) [@dubstep](https://www.ruby-forum.com/u/dubstep)\ **Post date:** [May 13, 2011, 8:54pm UTC](https://www.ruby-forum.com/t/ipv6-issues-question/206945/1 "2011-05-13T20:54:55Z")
Last night I had my provider (Linode) add IPv6 support for my server. I also had them assign me an IPv6 pool to use. I have Nginx 1.0.2 compiled with IPv6 support, restarted my Nginx and everything was fine all night and most of the morning. However, within minutes of me adding AAAA records to my domains, Nginx stopped and running and took the IPv4 networking down with it. I hadn’t even restarted Nginx after adding the records. Upon reboot with Nginx disabled, everything runs fine. I start Nginx and make a single IPv4 page request, the network is completely gone again on all ports. I don’t believe in coincidences so what could adding AAAA records to domains Nginx is listening for on port 80 trigger? Nginx had been running without problems for 12 hours with IPv6 enabled on the server with an assigned global scope IPv6 address. Within minutes of me adding those AAAA records, the trouble began. I don’t see anything in the logs that helps. Here is my configuration for Nginx: nginx: configure arguments: –sbin-path=/usr/sbin/nginx –conf-path=/etc/nginx/nginx.conf –user=nginx –group=nginx –http-client-body-temp-path=/var/lib/nginx/tmp/client\_body –http-proxy-temp-path=/var/lib/nginx/tmp/proxy –http-fastcgi-temp-path=/var/lib/nginx/tmp/fastcgi –error-log-path=/var/log/nginx/error.log –http-log-path=/var/log/nginx/access.log –prefix=/usr/share/nginx –pid-path=/var/run/nginx.pid –add-module=…/headers-more-nginx-module –add-module=…/ngx\_http\_redis-0.3.1 –add-module=…/ngx\_http\_upstream\_keepalive –add-module=…/memc-nginx-module –add-module=…/ngx\_cache\_purge –add-module=/usr/local/rvm/gems/ruby-1.9.2-p0@rails3/gems/passenger-3.0.2/ext/nginx –add-module=…/ngx\_http\_log\_request\_speed –add-module=…/mod\_strip –with-ipv6 –with-http\_ssl\_module –with-http\_gzip\_static\_module –with-http\_xslt\_module –with-http\_image\_filter\_module –with-http\_geoip\_module –with-http\_sub\_module –with-http\_realip\_module –with-http\_stub\_status\_module –with-http\_flv\_module –without-mail\_pop3\_module –without-mail\_imap\_module –without-mail\_smtp\_module –without-select\_module –without-poll\_module –with-openssl=…/openssl-1.0.0d –with-pcre=…/pcre-8.12 –with-zlib=…/zlib-1.2.5 –with-cpu-opt=Xeon –with-cc-opt=‘-pipe -s -O3 -Wall -Wp,-D\_FORTIFY\_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -mmmx -msse -msse2 -msse3 -mfpmath=sse -mtune=native -march=native -enable-new-dtags -DNODEBUG -DNDEBUG -enable-stdcall-fixup -frerun-loop-opt -ftracer’ Posted at Nginx Forum: > **[IPv6 Issues / Question](https://forum.nginx.org/read.php?2,197875,197875#msg-197875)** > > Last night I had my provider (Linode) add IPv6 support for my server. I also had them assign me an IPv6 pool to use. I have Nginx 1.0.2 compiled with IPv6 support, restarted my Nginx and everything was fine all night and most of the morning. However,... ---
**Author:** ![holstebm](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/h/c57346/32.png) [@holstebm](https://www.ruby-forum.com/u/holstebm)\ **Post date:** [May 13, 2011, 9:06pm UTC](https://www.ruby-forum.com/t/ipv6-issues-question/206945/2 "2011-05-13T21:06:03Z")
I should add that disabling IPv6 this way: sysctl -w net.ipv6.conf.all.disable\_ipv6=1 sysctl -w net.ipv6.conf.default.disable\_ipv6=1 sysctl -w net.ipv6.conf.lo.disable\_ipv6=1 without making any changes to the Nginx configuration, works. So it is definitely related to IPv6 and Nginx. TIA! Bret Posted at Nginx Forum: > **[Re: IPv6 Issues / Question](https://forum.nginx.org/read.php?2,197875,197877#msg-197877)** > > Last night I had my provider (Linode) add IPv6 support for my server. I also had them assign me an IPv6 pool to use. I have Nginx 1.0.2 compiled with IPv6 support, restarted my Nginx and everything was fine all night and most of the morning. However,... ---
**Author:** ![holstebm](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/h/c57346/32.png) [@holstebm](https://www.ruby-forum.com/u/holstebm)\ **Post date:** [May 13, 2011, 9:14pm UTC](https://www.ruby-forum.com/t/ipv6-issues-question/206945/3 "2011-05-13T21:14:04Z")
On Fri, May 13, 2011 at 02:54:06PM -0400, holstebm wrote: > and make a single IPv4 page request, the network is completely gone > again on all ports. What do you mean by “took the IPv4 networking down” ? Does it mean that any (inlcuding ssh, etc) IPv4 traffic goes down, or only HTTP or what ? – Igor S. ---
**Author:** ![holstebm](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/h/c57346/32.png) [@holstebm](https://www.ruby-forum.com/u/holstebm)\ **Post date:** [May 13, 2011, 9:26pm UTC](https://www.ruby-forum.com/t/ipv6-issues-question/206945/4 "2011-05-13T21:26:24Z")
Literally everything. SSH - everything. This is a VPS (Linode) with a Lish AJAX console that normally works even when all other networking is disabled and even it was down. I was literally blind and the only option left was to reboot each time. It took several reboots to narrow it down to a particular service. Please let me know if there is a particular log I should look at. I’ve looked at the messages and syslog as well as the access and error logs for nginx and they are all missing entries during the time networking was down. Thanks! I’ve been using Nginx for years barely a hiccup until this. Bret Posted at Nginx Forum: > **[Re: IPv6 Issues / Question](https://forum.nginx.org/read.php?2,197875,197883#msg-197883)** > > Last night I had my provider (Linode) add IPv6 support for my server. I also had them assign me an IPv6 pool to use. I have Nginx 1.0.2 compiled with IPv6 support, restarted my Nginx and everything was fine all night and most of the morning. However,... ---
**Author:** ![holstebm](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/h/c57346/32.png) [@holstebm](https://www.ruby-forum.com/u/holstebm)\ **Post date:** [May 13, 2011, 9:37pm UTC](https://www.ruby-forum.com/t/ipv6-issues-question/206945/5 "2011-05-13T21:37:30Z")
On Fri, May 13, 2011 at 03:25:47PM -0400, holstebm wrote: > Literally everything. SSH - everything. This is a VPS (Linode) with a > Lish AJAX console that normally works even when all other networking is > disabled and even it was down. I was literally blind and the only > option left was to reboot each time. It took several reboots to narrow > it down to a particular service. I believe this is a bug in Linux or VPS. A user mode program even run with root privilege that makes only usual listen/bind/setsockopt/accept/etc syscalls on IPv6 sockets should not cause such issues. – Igor S. ---
**Author:** ![holstebm](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/h/c57346/32.png) [@holstebm](https://www.ruby-forum.com/u/holstebm)\ **Post date:** [May 13, 2011, 9:28pm UTC](https://www.ruby-forum.com/t/ipv6-issues-question/206945/6 "2011-05-13T21:28:53Z")
I haven’t eliminated the possibility that Nginx is the symptom and not the cause. Of course, under the circumstances, I’m not sure how I might do that. But I am willing to provide anything you need to help get to the bottom of this. Posted at Nginx Forum: > **[Re: IPv6 Issues / Question](https://forum.nginx.org/read.php?2,197875,197885#msg-197885)** > > Last night I had my provider (Linode) add IPv6 support for my server. I also had them assign me an IPv6 pool to use. I have Nginx 1.0.2 compiled with IPv6 support, restarted my Nginx and everything was fine all night and most of the morning. However,... ---
**Author:** ![holstebm](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/h/c57346/32.png) [@holstebm](https://www.ruby-forum.com/u/holstebm)\ **Post date:** [May 13, 2011, 9:48pm UTC](https://www.ruby-forum.com/t/ipv6-issues-question/206945/7 "2011-05-13T21:48:02Z")
Okay, thanks, I’ll into that bit more. This is a production machine which, right now, limits me a bit. I is running Ubuntu 10.04 with one of the kernels from Linode. Sometime overnight this weekend, I’ll play with it a bit more. I can use other kernels or compile my own, if necessary. I was hoping what you thought about the AAAA records being added and the appearance of the issue might be helpful as it seems strange. Perhaps a routing problem of some sort when Nginx sent out a reply? Thanks for you help! Bret Posted at Nginx Forum: > **[Re: IPv6 Issues / Question](https://forum.nginx.org/read.php?2,197875,197892#msg-197892)** > > Last night I had my provider (Linode) add IPv6 support for my server. I also had them assign me an IPv6 pool to use. I have Nginx 1.0.2 compiled with IPv6 support, restarted my Nginx and everything was fine all night and most of the morning. However,... ---
**Author:** ![holstebm](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/h/c57346/32.png) [@holstebm](https://www.ruby-forum.com/u/holstebm)\ **Post date:** [May 13, 2011, 9:49pm UTC](https://www.ruby-forum.com/t/ipv6-issues-question/206945/8 "2011-05-13T21:49:53Z")
On Fri, May 13, 2011 at 03:47:29PM -0400, holstebm wrote: > Okay, thanks, I’ll into that bit more. This is a production machine > which, right now, limits me a bit. I is running Ubuntu 10.04 with one > of the kernels from Linode. Sometime overnight this weekend, I’ll play > with it a bit more. I can use other kernels or compile my own, if > necessary. > > I was hoping what you thought about the AAAA records being added and the > appearance of the issue might be helpful as it seems strange. Perhaps a > routing problem of some sort when Nginx sent out a reply? AAAA record may just cause IPv6 traffic to the host. And the traffic may cause kernel issues. – Igor S.