Hi,
After 'commit 876fd05ddbae03166e7037fca957b55bb3be6594
("ipv6: don't disable interface if last ipv6 address is removed")'
it is not clearing ipv6 interface configurations(routes, neighbours,
etc) when last ipv6 address of interface is removed.
This is now creating functionality issue with below deployment.
On ubuntu 14.04 (upgraded with linux kernel 3.19)
eth1 GW1: 2604:2000:7000:2::102
eth0 GW2: 2001:df7:6000:101::1b:102
HostA: 3804:3000:1406:2::102 (reachable via GW1 and GW2 both)
In this deployment, HostA is reachable via eth0 and eth1. I prefer
that all traffic for HostA should go via GW1 which is available on
link eth1.
$ ip -6 ro s
2001:df7:6000:101::/64 dev eth0 proto kernel metric 256
2604:2000:7000:2::/64 dev eth1 proto kernel metric 256
3804:3000:1406:2::/64 via 2604:2000:7000:2::102 dev eth1 metric 1024
fe80::/64 dev eth0 proto kernel metric 256
fe80::/64 dev eth1 proto kernel metric 256
default via 2001:df7:6000:101::1b:102 dev eth0 proto static metric 1
On failure of GW1 I removed all ipv6 address of eth1 so all traffic
should go through default gateway 'GW2'.
$ sudo ip -6 addr flush dev eth1
$ ip -6 ro s
2001:df7:6000:101::/64 dev eth0 proto kernel metric 256
3804:3000:1406:2::/64 via 2604:2000:7000:2::102 dev eth1 metric 1024
fe80::/64 dev eth0 proto kernel metric 256
fe80::/64 dev eth0.100 proto kernel metric 256
default via 2001:df7:6000:101::1b:102 dev eth0 proto static metric 1
But here, route for HostA is not deleted, so traffic for HostA is
still trying to go through GW1 which is not reachable anymore.
If 'commit 876fd05ddbae03166e7037fca957b55bb3be6594
("ipv6: don't disable interface if last ipv6 address is removed")'
is taken only for problem mention on changlog of that commit then
here I have alternate proposal which will overcome both issue.
Do you see any side effect of this proposal?
Mazhar Rana (1):
ipv6: addrconf: do addrconf_ifdown when last ipv6 address is removed
net/ipv6/addrconf.c | 2 ++
1 file changed, 2 insertions(+)
--
1.9.1
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