Paul Fertser
2012-Dec-28 16:18 UTC
[Nut-upsdev] Issues accessing http://www.networkupstools.org/ via IPv6
Hi, The website is inaccessible via IPv6 for some users that have MTU less than 1500 on their network interfaces, confirmed by several regulars at #ipv6. This looks like a misconfiguration of the server infrastructure that might be dropping ICMPv6 "fragmentation needed but DF set" packets before they have a chance to get back to the http daemon so it can do proper PMTU to the clients. Please consider fixing this rather sooner than later as it makes the website "very slow" (i.e. the browser waits for the connection to timeout and only then retries via IPv4) and also breaks NUT compilation for OpenWrt (and other source-based distros that use wget or curl to download the sources). TIA :) -- Be free, use free (http://www.gnu.org/philosophy/free-sw.html) software! mailto:fercerpav at gmail.com
Paul Fertser
2013-Jan-27 18:18 UTC
[Nut-upsdev] Issues accessing http://www.networkupstools.org/ via IPv6
(I guess that might have slipped through the cracks of the Christmas holidays, resending) Hi, The website is inaccessible via IPv6 for some users that have MTU less than 1500 on their network interfaces, confirmed by several regulars at #ipv6. This looks like a misconfiguration of the server infrastructure that might be dropping ICMPv6 "fragmentation needed but DF set" packets before they have a chance to get back to the http daemon so it can do proper PMTU to the clients. Please consider fixing this rather sooner than later as it makes the website "very slow" (i.e. the browser waits for the connection to timeout and only then retries via IPv4) and also breaks NUT compilation for OpenWrt (and other source-based distros that use wget or curl to download the sources). TIA :) -- Be free, use free (http://www.gnu.org/philosophy/free-sw.html) software! mailto:fercerpav at gmail.com