It seems like vlan helper script tries to add/remove iface twice, once 
per each iface record.

10.03.2016 21:42, Sven Kirmess пишет:
> I'm trying to configure an IPv6 and an IPv4 address on a VLAN interface.
>
> When I configure it on a non-VLAN interface like this in
> /etc/network/interfaces It works as expected, but when I put the same
> configuration on a VLAN interface I get an error message on up and down. It
> looks like it works anyway but is this the correct way to configure that?
>
> firewall# cat /etc/network/interfaces
> iface em0 inet static
>          address 192.168.20.1
>          netmask 255.255.255.0
>          broadcast +
> iface em0 inet6 static
>          address 2001:db8:20::1
>          netmask 64
>
> iface em0.30 inet static
>          address 192.168.30.1
>          netmask 255.255.255.0
>          broadcast +
> iface em0.30 inet6 static
>          address 2001:db8:30::1
>          netmask 64
>
>
> firewall# ifup em0
> firewall# ifconfig em0
> em0       Link encap:Ethernet  HWaddr 00:0D:B9:40:7F:EC
>            inet addr:192.168.20.1  Bcast:192.168.20.255  Mask:255.255.255.0
>            inet6 addr: 2001:db8:20::1/64 Scope:Global
>            UP BROADCAST MULTICAST  MTU:1500  Metric:1
>            RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>            TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
>            collisions:0 txqueuelen:1000
>            RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
>
> firewall# ifdown em0
> firewall# ifconfig em0
> em0       Link encap:Ethernet  HWaddr 00:0D:B9:40:7F:EC
>            BROADCAST MULTICAST  MTU:1500  Metric:1
>            RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>            TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
>            collisions:0 txqueuelen:1000
>            RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
>
> firewall#
>
>
>
> firewall# ifup em0.30
> vconfig: ioctl error for add: File exists
> firewall# ifconfig em0.30
> em0.30    Link encap:Ethernet  HWaddr 00:0D:B9:40:7F:EC
>            inet addr:192.168.30.1  Bcast:192.168.30.255  Mask:255.255.255.0
>            inet6 addr: 2001:db8:30::1/64 Scope:Global
>            UP BROADCAST MULTICAST  MTU:1500  Metric:1
>            RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>            TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
>            collisions:0 txqueuelen:1000
>            RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
>
> firewall# ifdown em0.30
> Cannot find device "em0.30"
> firewall# ifconfig em0.30
> ifconfig: em0.30: error fetching interface information: Device not found
> firewall#
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