Messages in this thread | | | Date | Mon, 13 Oct 2014 16:20:39 +0800 | From | zhuyj <> | Subject | Re: ipv4: net namespace does not inherit network configurations |
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Hi, Miller && Cong
Can we merge this patch into kernel mainline? since the independence between ipv4 and ipv6 is inconsistent even in the latest linux kernel(3.17-rc7), that is, the net namespace is independent in ipv6 while it is not in ipv4.
Thanks a lot. Zhu Yanjun
On 07/30/2014 01:48 AM, Cong Wang wrote: > 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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