gistfile1.txt

### En dehors du ns: l'interface tun0 a une IP

root@readynas:/home/thomas# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1024
    link/ether 28:c6:8e:37:0e:dc brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.12/24 brd 192.168.1.255 scope global dynamic eth0
       valid_lft 85112sec preferred_lft 85112sec
    inet6 2a01:cb19:8acf:5600:2ac6:8eff:fe37:edc/64 scope global dynamic mngtmpaddr 
       valid_lft 1772sec preferred_lft 572sec
    inet6 fe80::2ac6:8eff:fe37:edc/64 scope link 
       valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1024
    link/ether 28:c6:8e:37:0e:dd brd ff:ff:ff:ff:ff:ff
4: tunl0@NONE: <NOARP> mtu 1480 qdisc noop state DOWN group default qlen 1000
    link/ipip 0.0.0.0 brd 0.0.0.0
5: sit0@NONE: <NOARP> mtu 1480 qdisc noop state DOWN group default qlen 1000
    link/sit 0.0.0.0 brd 0.0.0.0
6: ip6tnl0@NONE: <NOARP> mtu 1452 qdisc noop state DOWN group default qlen 1000
    link/tunnel6 :: brd ::
11: tun0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN group default qlen 100
    link/none 
    inet 10.3.1.71/16 brd 10.3.255.255 scope global tun0
       valid_lft forever preferred_lft forever
    inet6 fe80::4871:4bdd:f643:ba53/64 scope link stable-privacy 
       valid_lft forever preferred_lft forever
       
## Création du NS
       
root@readynas:/home/thomas# ip netns add vpn
root@readynas:/home/thomas# ip netns list
vpn

## Je mets l'interface tun0 dans le ns

root@readynas:/home/thomas# ip link set dev tun0 netns vpn

## Et pouf, elle est là, mais sans IP

root@readynas:/home/thomas# ip netns exec vpn ip a
1: lo: <LOOPBACK> mtu 65536 qdisc noop state DOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: tunl0@NONE: <NOARP> mtu 1480 qdisc noop state DOWN group default qlen 1000
    link/ipip 0.0.0.0 brd 0.0.0.0
3: sit0@NONE: <NOARP> mtu 1480 qdisc noop state DOWN group default qlen 1000
    link/sit 0.0.0.0 brd 0.0.0.0
4: ip6tnl0@NONE: <NOARP> mtu 1452 qdisc noop state DOWN group default qlen 1000
    link/tunnel6 :: brd ::
11: tun0: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN group default qlen 100
    link/none