netdev - Strange behavior of command ip

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Message-ID: <3605451.dWV9SEqChM@eiktum>
Date: Fri, 16 Aug 2024 00:16:23 +0200
From: Freek de Kruijf <f.de.kruijf@...il.com>
To: netdev@...r.kernel.org
Subject: Strange behavior of command ip

I have the following bash script:

#!/bin/bash
getipv6() {
nmcli con modify "Wired connection 1" ipv6.addr-gen-mode eui64
nmcli con down "Wired connection 1"
nmcli con up "Wired connection 1"
/usr/bin/ip -6 a
}
getipv6

When I run the script the output is:

Connection 'Wired connection 1' successfully deactivated (D-Bus active path: /
org/freedesktop/NetworkManager/ActiveConnection/23)
Connection successfully activated (D-Bus active path: /org/freedesktop/
NetworkManager/ActiveConnection/24)
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 state UNKNOWN qlen 1000
    inet6 ::1/128 scope host noprefixroute 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 state UP qlen 1000
    inet6 fe80::dea6:32ff:fe55:12be/64 scope link tentative noprefixroute 
       valid_lft forever preferred_lft forever

When I run the command "/usr/bin/ip -6 a" the output is:

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 state UNKNOWN qlen 1000
    inet6 ::1/128 scope host noprefixroute 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 state UP qlen 1000
    inet6 2001:4c3c:702:b700:dea6:32ff:fe55:12be/64 scope global dynamic 
noprefixroute 
       valid_lft 4126sec preferred_lft 3466sec
    inet6 fe80::dea6:32ff:fe55:12be/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever

Now the global IPv6 of eth0 is shown.

-- 

vr.gr.

Freek de Kruijf