there is an ipv6 network isolation regression in the 3.18 linux-vserver patches (as compared to the 3.10 and 3.14 patches), as alex noted on irc [1] [2] and documented elsewhere [3]. patch-3.18.5-vs2.3.7.3.diff and earlier are affected. an available patch [4] fixes the regression as tested using alex's documented test. it's specifically for 3.18.7-vs2.3.7.3 (as patch-3.18.5-vs2.3.7.3.diff applies rather cleanly to 3.18.7), but should apply to 3.18.[56]-vs2.3.7.3. please test and provide feedback. [1] http://irc.13thfloor.at/LOG/2015-02/LOG_2015-02-12.txt [2] http://irc.13thfloor.at/LOG/2015-02/LOG_2015-02-13.txt [3] http://p.animux.de/IqmfxzEMnd9.html [4] http://vserver.13thfloor.at/Experimental/delta-ipv6udp-fix01.diff corey -- undefined@pobox.com