Messages in this thread | | | Date | Tue, 29 Jul 2014 10:48:37 -0700 | Subject | Re: ipv4: net namespace does not inherit network configurations | From | Cong Wang <> |
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On Tue, Jul 29, 2014 at 2:29 AM, zhuyj <zyjzyj2000@gmail.com> wrote: > Hi,all > > I did a test on kernel3.16 rc6: > > root@qemu1:~# echo 1 > /proc/sys/net/ipv6/conf/all/forwarding > root@qemu1:~# echo 1 > /proc/sys/net/ipv4/conf/all/forwarding > root@qemu1:~# ip netns list > root@qemu1:~# ip netns add fib1 > root@qemu1:~# ip netns exec fib1 bash > root@qemu1:~# cat /proc/sys/net/ipv6/conf/all/forwarding > 0 > root@qemu1:~# cat /proc/sys/net/ipv4/conf/all/forwarding > 1 > > The behavior of ipv4 and ipv6 is very inconsistent. I checked > the kernel source code. I found that from this patch > [ipv6: fix bad free of addrconf_init_net], the above difference > appeared. > > Since a net namespace is independent to another. That is, there > is no any relationship between the net namespaces. So the behavior > of ipv4 is not correct. >
Well, they are already independent, not shared, just that the initial value is duplicated from init_net for IPv4.
This change might break existing applications which rely on this behavior, but given IPv6 change is almost the same, I think it's ok.
BTW, you need to submit a patch as normal, instead of as an attachment.
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