Arch Linux

x_puma_x

Member

Registered: 2010-03-20

Posts: 11

NetworkManager: wired + wireless have same metric on IPv6

I have  a wired (enp0s20u2) and a wireless (wlp2s0) networkcard connected to the same network. The networking is managed by NetworkManager 0.9.8.9. The routing tables are the following:

$ ip route show
default via 192.168.0.1 dev enp0s20u2  proto static
192.168.0.0/24 dev enp0s20u2  proto kernel  scope link  src 192.168.0.9  metric 1
192.168.0.0/24 dev wlp2s0  proto kernel  scope link  src 192.168.0.10  metric 9

$ ip -6 route show
2a02:908:e513:d900::/64 dev enp0s20u2  proto kernel  metric 256  expires 1084883sec
2a02:908:e513:d900::/64 dev wlp2s0  proto kernel  metric 256  expires 1084883sec
fe80::/64 dev enp0s20u2  proto kernel  metric 256
fe80::/64 dev wlp2s0  proto kernel  metric 256
default via fe80::ce35:40ff:fee5:8ccd dev enp0s20u2  proto ra  metric 1024  expires 1777sec
default via fe80::ce35:40ff:fee5:8ccd dev wlp2s0  proto ra  metric 1024  expires 1777sec

With IPv4 the wired connection gets a lower metric wich is fine.
But with IPv6 both connections get the same metric and since there is no other criterion for choosing a source address (according to RFC3484) the source address and interface gets chosen randomly.

Is this a bug or is this expected behaviour?

Rexilion

Member

Registered: 2013-12-23

Posts: 784

Re: NetworkManager: wired + wireless have same metric on IPv6

That looks explosive. Does it even work okay?

I'm not sure, but why not define a metric in NM?

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fs/super.c : "Self-destruct in 5 seconds.  Have a nice day...\n",

x_puma_x

Member

Registered: 2010-03-20

Posts: 11

Re: NetworkManager: wired + wireless have same metric on IPv6

Yes it works okay.

I can't find any option to define a metric in network manager