Ipv6 routes are deleting while make interface down and up.

[ukkreddy]

Hi,

Ipv6 routes are deleting while make interface down and up.

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[root@uxcasxxx labuser]# ifconfig eth1
eth1 Link encap:Ethernet HWaddr 00:07:E9:A5:21:82
inet6 addr: fe80::207:e9ff:fea5:2182/64 Scope:Link
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:119 errors:0 dropped:0 overruns:0 frame:0
TX packets:49 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:16357 (15.9 KiB) TX bytes:10568 (10.3 KiB)

[root@uxcasxxx labuser]#
[root@uxcasxxx labuser]# ip -6 addr add 2001::1/64 dev eth1
[root@uxcasxxx labuser]#
[root@uxcasxxx labuser]# ip -6 route
2001::/64 dev eth1 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 0
fe80::/64 dev eth0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 0
fe80::/64 dev eth1 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 0
fe80::/64 dev eth2 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 0
[root@uxcasxxx labuser]#
[root@uxcasxxx labuser]# ip -6 route add 4444::1/128 via 2001::5
[root@uxcasxxx labuser]#
[root@uxcasxxx labuser]# ip -6 route
2001::/64 dev eth1 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 0
4444::1 via 2001::5 dev eth1 metric 1024 mtu 1500 advmss 1440 hoplimit 0
fe80::/64 dev eth0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 0
fe80::/64 dev eth1 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 0
fe80::/64 dev eth2 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 0
[root@uxcasxxx labuser]#
[root@uxcasxxx labuser]# ifconfig eth1 down
[root@uxcasxxx labuser]#
[root@uxcasxxx labuser]# ip -6 route
fe80::/64 dev eth0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 0
fe80::/64 dev eth2 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 0
[root@uxcasxxx labuser]#
[root@uxcasxxx labuser]#
[root@uxcasxxx labuser]# ifconfig eth1 up
[root@uxcasxxx labuser]#
[root@uxcasxxx labuser]# ip -6 route
fe80::/64 dev eth0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 0
fe80::/64 dev eth2 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 0
[root@uxcasxxx labuser]#
[root@uxcasxxx labuser]# ifconfig eth1
eth1 Link encap:Ethernet HWaddr 00:07:E9:A5:21:82
inet6 addr: 2001::1/64 Scope:Global
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:119 errors:0 dropped:0 overruns:0 frame:0
TX packets:49 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:16357 (15.9 KiB) TX bytes:10568 (10.3 KiB)

[root@uxcasxxx labuser]#

================================================== ========

I have few doubts here. Can any one help me ..?

1) When interface make down,
a) IPv4 address is lost, but IPv6 address is not lost. is it expected behavior?
if no, is there any patches?
2) when interface make down and up
a) why only IPv6 routes are deleted?
b) let me know is there any issues and patches for this
3) Why ECMP route are deleted, when delete best route? (routes are configure by using netlinks)

Thanks an advance.......

[george_toolan]

It's a feature and not a bug ;-)

What exactly is your problem?

[ukkreddy]

Hi,

Is it expected behavior?

I think, Expected behaviour is route should be add again when interface make UP. Directly connected route also deleted, even ip address is present on interface.

---------- Post added at 06:36 PM ---------- Previous post was at 06:13 PM ----------

I think, IPv6 directly route should be add again when interface make up. because it is troughs an error (RTNETLINK answers: File exists),if adding ip address (its already existing IP). This time directly route will not add.

It's a bug, right?