Diaulas Castro
2017-Mar-21 19:51 UTC
[CentOS] Centos 7.3.1611 - NetworkManager + dhcp + ipv6
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?
Patrick Laimbock
2017-Mar-22 11:01 UTC
[CentOS] Centos 7.3.1611 - NetworkManager + dhcp + ipv6
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 myIIRC 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
Diaulas Castro
2017-Mar-22 18:49 UTC
[CentOS] Centos 7.3.1611 - NetworkManager + dhcp + ipv6
Hi Patrick, I did not disabled on grub or module because of Centos 7 FAQ?tips "Upstream employee Daniel Walsh?recommends?not disabling the ipv6 module, as that can cause issues with SELinux and other components, but adding the following to /etc/sysctl.conf" So I used only sysctl, but the dhcp client or NM or systemd overwrite sysctl settings. About using NM I can't because the VM it's deployed from OVA template, can't connect to disable ipv6 until I get the ipv4 address. If there's on NM conf to disable ipv6 on all NEW interfaces/connections will help me, so I can edit the OVA file. De: CentOS <centos-bounces at centos.org> em nome de Patrick Laimbock <patrick at laimbock.com> Enviado: quarta-feira, 22 de mar?o de 2017 08:01:49 Para: centos at centos.org Assunto: Re: [CentOS] Centos 7.3.1611 - NetworkManager + dhcp + ipv6 ? 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 myIIRC 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 _______________________________________________ CentOS mailing list CentOS at centos.org https://lists.centos.org/mailman/listinfo/centos