Re: [libvirt] [PATCH v2 0/5] Prevent losing IPv6 routes due to forwarding
On Wed, 2017-05-10 at 13:30 +0800, Yalan Zhang wrote:
I'm sorry that I missed the mail.
没关系
But currently I can not reproduce it.
For the error by net-create, it is executed when I set accept_ra to 1.
That sounds more normal. net-create and net-start are triggering the
same code in the end.
I have just test on libvirt-3.2.0-4.el7.x86_64, the behavior changes,
it seems like there is no check for accept_ra
before start a network with ipv6.
1. define and start a network with ipv6 settings
# virsh net-dumpxml default6
<network>
<name>default6</name>
<uuid>c502d02c-fbd0-49d9-91e4-0fcf0ef159d0</uuid>
<forward mode='nat'/>
<bridge name='virbr4' stp='on' delay='0'/>
<mac address='52:54:00:04:d5:3c'/>
<ip address='192.168.10.1' netmask='255.255.255.0'>
<dhcp>
<range start='192.168.10.2' end='192.168.10.254'/>
</dhcp>
</ip>
<ip family='ipv6' address='2001:db8:ca2:2::1'
prefix='64'>
<dhcp>
<range start='2001:db8:ca2:2:1::10'
end='2001:db8:ca2:2:1::ff'/>
</dhcp>
</ip>
</network>
# cat /proc/sys/net/ipv6/conf/enp0s25/accept_ra
1
# virsh net-start default6 =====> the network can start as well with accept_ra=1
Network default6 started
It seems that the "virNetDevIPGetAcceptRA()" in patch "network: check
accept_ra before enabling ipv6 forwarding"
with commit 00d28a78 is not executed when I start a network. Please help to check, Thank
you.
It won't complain at all if there is no RA route set on the host.
To reproduce, you need to setup a machine acting as an ipv6 router
with radvd on the guest network.
Do you actually have an RA route for the enp0s25 device? You can check
it by running `ip -6 r`. These routes are indicated with 'proto ra'
--
Cedric