On 21-03-17 20:51, Diaulas Castro wrote:
Used steps on sysctl from Centos7 FAQ (https://wiki.centos.org/FAQ/CentOS7) and some gathered on internet
# cat /etc/sysctl.d/90-disable_ipv6.conf net.ipv6.conf.all.disable_ipv6=1 net.ipv6.conf.default.disable_ipv6=1 net.ipv6.conf.eth0.disable_ipv6=1 net.ipv6.conf.eth1.disable_ipv6=1 net.ipv6.conf.all.use_tempaddr=0 net.ipv6.conf.all.autoconf=0 net.ipv6.conf.all.accept_ra=0 net.ipv6.conf.default.autoconf=0 net.ipv6.conf.default.accept_ra=0 net.ipv6.conf.eth0.autoconf=0 net.ipv6.conf.eth1.autoconf=0
But with dhcp, NetworkManager (or something) reenables ipv6 on interfaces.
#sysctl -a | grep ipv6 | grep disable net.ipv6.conf.all.disable_ipv6 = 1 net.ipv6.conf.default.disable_ipv6 = 1 net.ipv6.conf.eth0.disable_ipv6 = 0 net.ipv6.conf.eth1.disable_ipv6 = 1 net.ipv6.conf.lo.disable_ipv6 = 1
And the interface gets the ipv4 but still have temporary ipv6 on it (our dhcp doesnt support ipv6)
# ip a s eth0 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP qlen 1000 link/ether 00:0c:29:31:5a:9d brd ff:ff:ff:ff:ff:ff inet 10.10.216.247/24 brd 10.10.216.255 scope global dynamic eth0 valid_lft 451sec preferred_lft 451sec inet6 fe80::20c:29ff:fe31:5a9d/64 scope link valid_lft forever preferred_lft forever
And this bugs my use for ovftool with the option "--X:waitForIp" because it's returns (mostly of times) the ipv6 addr
It's a bug, missing documentation or my
IIRC you can disable IPv6 in NetworkManager with:
# nmcli connection modify eth0 ipv6.method ignore # systemctl restart NetworkManager
or you can disable IPv6 entirely with:
# vi /etc/default/grub GRUB_CMDLINE_LINUX_DEFAULT="ipv6.disable=1 <other options>"
# grub-mkconfig -o /boot/grub2/grub.cfg # reboot
HTH, Patrick