grrr.... changed the subject in send-email editor which dropped it.
obviously this is for net-next
On 2/13/16 11:23 PM, David Ahern wrote:
Currently, all ipv6 addresses are flushed when the interface is configured
down, including global, static addresses:
$ ip -6 addr add dev eth1 2000:11:1:1::1/64
$ ip addr show dev eth1
3: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group
default qlen 1000
link/ether 02:04:11:22:33:01 brd ff:ff:ff:ff:ff:ff
inet6 2000:11:1:1::1/64 scope global tentative
valid_lft forever preferred_lft forever
$ ip link set dev eth1 up
$ ip link set dev eth1 down
$ ip addr show dev eth1
3: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast state DOWN group
default qlen 1000
link/ether 02:04:11:22:33:01 brd ff:ff:ff:ff:ff:ff
Add a new sysctl to make this behavior optional. The new setting defaults to
flush all addresses to maintain backwards compatibility. When the set global
addresses with no expire times are not flushed on an admin down:
$ echo 1 > /proc/sys/net/ipv6/conf/eth1/keep_addr_on_down
$ ip -6 addr add dev eth1 2000:11:1:1::1/64
$ ip addr show dev eth1
3: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast state DOWN group
default qlen 1000
link/ether 02:04:11:22:33:01 brd ff:ff:ff:ff:ff:ff
inet6 2000:11:1:1::1/64 scope global tentative
valid_lft forever preferred_lft forever
$ ip link set dev eth1 up
$ ip link set dev eth1 down
$ ip addr show dev eth1
3: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc pfifo_fast state DOWN group
default qlen 1000
link/ether 02:04:11:22:33:01 brd ff:ff:ff:ff:ff:ff
inet6 2000:11:1:1::1/64 scope global
valid_lft forever preferred_lft forever
inet6 fe80::4:11ff:fe22:3301/64 scope link
valid_lft forever preferred_lft forever
Signed-off-by: David Ahern <d...@cumulusnetworks.com>
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