potjoe Posted July 21, 2020 Share Posted July 21, 2020 (edited) Hi all, I just noticed a weird behaviour while migrating some docker containers to Ipv6. They appear to be assigned two different ipv6 addresses on the same subnet. Ip addr on a container : eth0@if108: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default link/ether 02:42:c0:a8:28:04 brd ff:ff:ff:ff:ff:ff link-netnsid 0 inet 192.168.40.4/24 brd 192.168.40.255 scope global eth0 valid_lft forever preferred_lft forever inet6 2a01:****:****:**e4:****:****:****:2804/64 scope global dynamic mngtmpaddr valid_lft 86392sec preferred_lft 14392sec inet6 2a01:****:****:**e4::7/64 scope global nodad valid_lft forever preferred_lft forever inet6 fe80::42:c0ff:fea8:2804/64 scope link valid_lft forever preferred_lft forever The 2a01:****:****:**e4::/64 subnet is configured on VLAN 40 with Router Advertisement on a pfsense VM. In Unraid > Settings > Network settings, VLAN 40 is configured with IPV4 and IPV6, and but no ip are assigned (because I don't want to access my server on this subnet, only web services, docker and VMs). Finally, containers are using the br0.40 interface and here is the configuration in Settings > Docker for ipv6 : IPv6 custom network on interface br0.40: Subnet: 2a01:****:****:**e4::/64 Gateway: 2a01:****:****:**e4::1 DHCP pool: not set One last thing, when disabling Router Advertisement on this interface in pfSense, the stateless ip is no longer generated. Only remains 2a01:****:****:**e4::7. Why is this last ip assigned whereas there is no DHCP pool nor RA ? Could it be related to this bug report ? Thanks everyone Edited July 23, 2020 by potjoe Quote Link to comment
YUR Posted December 21, 2021 Share Posted December 21, 2021 Similar issue here, I deploy a qbittorrent with static IPv6 [fc00::1004]. However, it will always automatically assign an additional IPv6 (related to MAC address). By checking my router's connection, these two ips are both active. my question is, how to disable one of these two ips Quote Link to comment
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