armbian-config IPV6 support? I received IPv6: eth0: IPv6 duplicate address

[SoSie]

Hello,

 

When we install armbian cinnammon,  the eth0 ip is set default to 192.168.0.8.
I cloned the installation and then the cloned conflicts with the source so I though to use armbian-config to change the IP adress.
The ipv4 changed but I noticed warnings in/var/log/syslog : IPv6: eth0: IPv6 duplicate address..
It seems armbian-config does not update ipv6 or? What should be do, disable ipv6? I read it is not recommended at all.

[SoSie]

Hum @Igor recommends to set IPV6 in ignore mode with nmtui-edit

 

[SoSie]

I unmark as solution because I still have connextion lost on ssh or sftp connection resetted by pear.

as I was sftp on bananapi A :

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether a6:b7:fd:ec:f9:87 brd ff:ff:ff:ff:ff:ff permaddr 42:ba:c9:a3:fb:27
    inet 192.168.0.8/24 brd 192.168.0.255 scope global dynamic noprefixroute eth0
       valid_lft 3527sec preferred_lft 3527sec
    inet6 2a03:d604:11d:eb00:d3d2:c282:7a9d:4f13/64 scope global temporary dynamic 
       valid_lft 1772sec preferred_lft 1772sec
    inet6 2a03:d604:11d:eb00:117e:6a5f:abb2:3551/64 scope global temporary dynamic 
       valid_lft 1769sec preferred_lft 1769sec
    inet6 2a03:d604:11d:eb00:309d:695d:62d6:df0f/64 scope global temporary dynamic 
       valid_lft 1766sec preferred_lft 1766sec
    inet6 2a03:d604:11d:eb00:1409:19fb:20c8:1ac1/64 scope global temporary dynamic 
       valid_lft 1763sec preferred_lft 1763sec
    inet6 2a03:d604:11d:eb00:15dd:e03:244e:a87f/64 scope global temporary dynamic 
       valid_lft 1760sec preferred_lft 1760sec
    inet6 2a03:d604:11d:eb00:ed97:1274:60af:cc6d/64 scope global temporary dynamic 
       valid_lft 1757sec preferred_lft 1757sec
    inet6 2a03:d604:11d:eb00:6156:e51d:b46e:5c0a/64 scope global temporary dynamic 
       valid_lft 1754sec preferred_lft 1754sec
    inet6 2a03:d604:11d:eb00:c214:5a77:88bc:d990/64 scope global temporary dynamic 
       valid_lft 1751sec preferred_lft 1751sec
    inet6 2a03:d604:11d:eb00:878f:9f50:14a3:19d9/64 scope global temporary dynamic 
       valid_lft 1748sec preferred_lft 1748sec
    inet6 2a03:d604:11d:eb00:c832:7bcb:4b50:be2e/64 scope global temporary dynamic 
       valid_lft 1745sec preferred_lft 1745sec
    inet6 2a03:d604:11d:eb00:f345:d4f2:1b5b:9a8e/64 scope global temporary dynamic 
       valid_lft 1742sec preferred_lft 1742sec
    inet6 2a03:d604:11d:eb00:e358:706d:16ee:1425/64 scope global temporary dynamic 
       valid_lft 1739sec preferred_lft 1739sec
    inet6 2a03:d604:11d:eb00:8a71:2d3c:f2f9:58a0/64 scope global temporary dynamic 
       valid_lft 1736sec preferred_lft 1736sec
    inet6 2a03:d604:11d:eb00:45e7:778b:3b13:5824/64 scope global temporary dynamic 
       valid_lft 1733sec preferred_lft 1733sec
    inet6 2a03:d604:11d:eb00:e733:197d:7a82:b7b8/64 scope global temporary dynamic 
       valid_lft 1730sec preferred_lft 1730sec
    inet6 fe80::a4b7:fdff:feec:f987/64 scope link dadfailed tentative 
       valid_lft forever preferred_lft forever

it was switched to bananapi B,

eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether a6:b7:fd:ec:f9:87 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.18/24 brd 192.168.0.255 scope global noprefixroute eth0
       valid_lft forever preferred_lft forever
    inet 192.168.0.8/24 brd 192.168.0.255 scope global secondary dynamic noprefixroute eth0
       valid_lft 2282sec preferred_lft 2282sec
    inet6 2a03:d604:11d:eb00:affa:b0a3:12b8:9d8e/64 scope global temporary dynamic 
       valid_lft 3598sec preferred_lft 3598sec
    inet6 2a03:d604:11d:eb00:d0d9:743b:d37c:be87/64 scope global temporary deprecated dynamic 
       valid_lft 3598sec preferred_lft 0sec
    inet6 2a03:d604:11d:eb00:a4b7:fdff:feec:f987/64 scope global dynamic mngtmpaddr 
       valid_lft 3598sec preferred_lft 3598sec
    inet6 fe80::a4b7:fdff:feec:f987/64 scope link 
       valid_lft forever preferred_lft forever

 

 

 

when I uploaded a thing on A it put the file on B, it is a complete mess of IP table, @igor,  it seems even like a IPV6 table flooding !

This is a big issue, IPV6 interfers with IPV4 ! IMAC adresses from A and B are the same here , shoul'nt be unique as based on the constructor network card?
 

18.0-168-192.rev (192.168.0.18) at a6:b7:fd:ec:f9:87 [ether] on enp11s0
8.0-168-192.rev (192.168.0.8) at a6:b7:fd:ec:f9:87 [ether] on enp11s0

 

 

Edited February 11, 2023 by SoSie

[SoSie]

OMg Bunny has found a bone in the Bananapi M5, Indeed MAC address MUST be unique in the world to avoid ARP spoofing .. This really sucks!
Oh maybe IMAC can be administered in fact...YES because

 

 

and as root (ssh root@192.168.0.x or locally) with :
 

nmtu-edit

we can adjust it after selecting Wire connection 1 linked to interface eth0

 

Edited February 11, 2023 by SoSie