On Sat, 12 Feb 2011 14:35:51 +0100, Aram Avetisyan <[log in to unmask]> wrote: >Hello, > >Using SL 5.4 ( 2.6.18-194.32.1.el5 ) from my apartment results in very >slow DNS lookups -- on the order of 30 seconds for each new page. I am >pretty sure the problem is with DNS because it goes away if I use vpnc >to tunnel to Fermilab. Google led me to the following workaround: add > >alias ipv6 off >alias net-pf-10 off > >to /etc/modprobe.conf . This works, but the system now complains about >some error with ipv6 tables when it boots. Is there a better way to fix >this (without changing any router settings -- I don't have the password) ? > >Thanks. > >-- Aram The advice at http://wiki.centos.org/FAQ/CentOS5#head-47912ebdae3b5ac10ff76053ef057c366 b421dc4 (that's all one line) worked for me. In particular running "/sbin/chkcon fig ip6tables off", once there is no ipv6 traffic for the ip6tables firewall to protect. HTH, Stephen Isard