GeoIP module breaks for IPv4 when IPv6 is enabled
thias at spam.spam.spam.spam.spam.spam.spam.egg.and.spam.freshrpms.net
Fri May 13 19:05:02 MSD 2011
I just enabled IPv6 on some web servers running nginx, and the $geoip_*
variables all broke for existing IPv4 traffic.
This seems to be because when not changing the net.ipv6.bindv6only
sysctl value to 1 on Linux, choosing to "listen [::]:80" has nginx
automatically work for IPv4 connections, but receiving source IP
addresses as IPv4-Mapped IPv6 addresses :
Before the listen change : 192.168.38.87
After the listen change : ::ffff:192.168.38.87
Lots of details are in rfc4291, rfc4038 (and surely others), but I
think that this configuration should be gracefully handled by the GeoIP
This was tested with nginx 1.0.2 on Red Hat Enterprise Linux 5 x86_64.
A workaround is to change net.ipv6.bindv6only to 1 and have two
different listen directives as "80" and "[::]:80" for all "server"
sections, but that would be best avoided just to fix this.
Clean custom Red Hat Linux rpm packages : http://freshrpms.net/
Fedora release 14 (Laughlin) - Linux kernel 220.127.116.11-83.fc14.x86_64
Load : 0.00 0.01 0.12
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