Disable ipv6 in centos 7
To verify if IPv6 is enabled or not, execute ifconfig -a | grep inet6 inet6 fe80::211:aff:fe6a:9de4 prefixlen 64 scopeid 0x20 inet6 ::1 prefixlen 128 scopeid 0x10[host] Disable Ipv6 in kernel module (requires reboot) Edit /etc/default/grub add ipv6.disable=1 in line GRUB_CMDLINE_LINUX, e.g cat /etc/default/grub GRUB_TIMEOUT=5 GRUB_DEFAULT=saved GRUB_DISABLE_SUBMENU=true GRUB_TERMINAL_OUTPUT="console" GRUB_CMDLINE_LINUX="ipv6.disable=1 crashkernel=auto rhgb quiet" GRUB_DISABLE_RECOVERY="true" Regenerate a GRUB configuration file and overwrite existing one grub2-mkconfig -o /boot/grub2/grub.cfg Restart system and verify no line “inet6” in “ip addr show” command output ...