From: David Ahern <dsa@cumulusnetworks.com>
To: netdev@vger.kernel.org
Cc: hannes@stressinduktion.org
Subject: Re: [PATCH] net: ipv6: Make address flushing on ifdown optional
Date: Sat, 13 Feb 2016 23:25:19 +0100 [thread overview]
Message-ID: <56BFAD4F.5080600@cumulusnetworks.com> (raw)
In-Reply-To: <1455402207-9217-1-git-send-email-dsa@cumulusnetworks.com>
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 <dsa@cumulusnetworks.com>
> ---
next prev parent reply other threads:[~2016-02-13 22:25 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-13 22:23 [PATCH] net: ipv6: Make address flushing on ifdown optional David Ahern
2016-02-13 22:25 ` David Ahern [this message]
2016-02-16 8:45 ` YOSHIFUJI Hideaki
2016-02-16 15:16 ` David Ahern
2016-02-17 2:10 ` YOSHIFUJI Hideaki
2016-02-17 3:45 ` David Ahern
2016-02-17 18:05 ` David Miller
2016-02-17 18:09 ` David Ahern
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