Lars,
as I do not want to set up an initial "system" IP on the device,
setting 'net.ipv4.conf.all.promote_secondaries=1' is the way to go for
me ... and it appears to work perfectly - MANY THANKS!
For completeness, I am including an example showing what happens with
...promote_secondaries set to both 0 and 1, using 'ip', rather than
'ifconfig' (but as I said in my original post (and as also indicated
by Lars), be aware that the same problem exists whether you are using
'ip'/IPaddr2 or 'ifconfig'/IPaddr) ...
=== ** WITHOUT ** net.ipv4.conf.all.promote_secondaries set to 1 ===
server# sysctl -w net.ipv4.conf.all.promote_secondaries=0
net.ipv4.conf.all.promote_secondaries = 0
server# ip -f inet addr add AAA.AAA.AAA.164/22 brd bbb.bbb.bbb.255 dev
eth0.666 label eth0.666:0
server# ip -f inet addr add AAA.AAA.AAA.163/22 brd bbb.bbb.bbb.255 dev
eth0.666 label eth0.666:1
server# ip -f inet addr add AAA.AAA.AAA.162/22 brd bbb.bbb.bbb.255 dev
eth0.666 label eth0.666:2
server# ip addr show
...
6: eth0....@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
link/ether xx:xx:xx:xx:xx:xx brd ff:ff:ff:ff:ff:ff
inet AAA.AAA.AAA.164/22 brd bbb.bbb.bbb.255 scope global eth0.666:0
inet AAA.AAA.AAA.163/22 brd bbb.bbb.bbb.255 scope global secondary
eth0.666:1
inet AAA.AAA.AAA.162/22 brd bbb.bbb.bbb.255 scope global secondary
eth0.666:2
inet6 ...
...
[ All OK. Remove the first IP (labeled 'eth0.666:0') ]
server# ip -f inet addr delete AAA.AAA.AAA.164/22 dev eth0.666
server# ip addr show
...
6: eth0....@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
link/ether xx:xx:xx:xx:xx:xx brd ff:ff:ff:ff:ff:ff
inet6 ...
...
[ *** Ugh *** The other two addresses (labels 'eth0.666:1' and
'eth0.666:2') where removed along with 'eth0.666:0' ]
[ Note that it is not the 'first' device by the *labeling* - if you created
'eth0.666:2' first and then the other two, then deleting 'eth0.666:2'
will delete the other two as well. ]
=== ** With ** net.ipv4.conf.all.promote_secondaries set to 1 ===
server# sysctl -w net.ipv4.conf.all.promote_secondaries=1
net.ipv4.conf.all.promote_secondaries = 1
server# ip -f inet addr add AAA.AAA.AAA.164/22 brd bbb.bbb.bbb.255 dev
eth0.666 label eth0.666:0
server# ip -f inet addr add AAA.AAA.AAA.163/22 brd bbb.bbb.bbb.255 dev
eth0.666 label eth0.666:1
server# ip -f inet addr add AAA.AAA.AAA.162/22 brd bbb.bbb.bbb.255 dev
eth0.666 label eth0.666:2
server# ip addr show
...
6: eth0....@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
link/ether xx:xx:xx:xx:xx:xx brd ff:ff:ff:ff:ff:ff
inet AAA.AAA.AAA.164/22 brd bbb.bbb.bbb.255 scope global eth0.666:0
inet AAA.AAA.AAA.163/22 brd bbb.bbb.bbb.255 scope global secondary
eth0.666:1
inet AAA.AAA.AAA.162/22 brd bbb.bbb.bbb.255 scope global secondary
eth0.666:2
inet6 ...
...
[ All OK. Remove the first IP (labeled 'eth0.666:0') ]
server# ip -f inet addr delete AAA.AAA.AAA.164/22 dev eth0.666
server# ip addr show
...
6: eth0....@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
link/ether xx:xx:xx:xx:xx:xx brd ff:ff:ff:ff:ff:ff
inet AAA.AAA.AAA.163/22 brd bbb.bbb.bbb.255 scope global eth0.666:1
inet AAA.AAA.AAA.162/22 brd bbb.bbb.bbb.255 scope global secondary
eth0.666:2
inet6 ...
...
[ Yippee! The second IP (labeled 'eth0.666:1') has been promoted.
Delete the new primary ... ]
server# ip -f inet addr delete AAA.AAA.AAA.163/22 dev eth0.666
server# ip addr show
...
6: eth0....@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
link/ether xx:xx:xx:xx:xx:xx brd ff:ff:ff:ff:ff:ff
inet AAA.AAA.AAA.162/22 brd bbb.bbb.bbb.255 scope global eth0.666:2
inet6 ...
...
[ Again, that works too. Delete the last one ... ]
server# ip -f inet addr delete AAA.AAA.AAA.162/22 dev eth0.666
server# ip addr show
...
6: eth0....@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
link/ether xx:xx:xx:xx:xx:xx brd ff:ff:ff:ff:ff:ff
inet6 ...
...
[ Perfect ]
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