Howto disable IPv6 on Ubuntu 13.04 12.10 12.04 11.10 11.04 Step 1:  For disable IPv6 on Ubuntu Server, we need add these configuration lines in sysctl.conf # IPv6 configuration net.ipv6.conf.all.disable_ipv6 = 1 net.ipv6.conf.default.disable_ipv6 = 1 net.ipv6.conf.lo.disable_ipv6 = 1 via Howto disable IPv6 on Ubuntu 13.04 12.10 12.04 11.10 11.04 – IT Help Blog – We