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I have a Debian 8 machine, where I've configured two VLAN interfaces in /etc/network/interfaces. Now I've deconfigured it (deleted information from interfaces file), restarted networking, and now it does not work at all. /etc/init.d/networking restarts correctly, I see the IP addresses on interfaces from console, but I can't reach them anymore. Furthermore, I still see my VLAN interfaces in ip addr show command (and in /proc/net/vlan/config file). If I try stopping VLAN interfaces by ifdown script, it says that interface is not configured. All 4 interfaces are configured as DHCP with allow-hotplug. Routing is correct.

Seems that the problem is somewhere in VLANs, because if I try pinging default gateway, destination host unreachable answer comes back from VLAN IP, and if I ping it via eth0, all works correct. Where did it become stuck?

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Try and see if your vlan interfaces are still removable via vconfig:

vconfig rem yourInterfaces.name

Also, sometimes when "ifdown" gives that error using ifconfig still works:

ifconfig yourInterfaces.name down

One option to try:

ip link delete interface.name
  • Nope, I do not have Internet access, so I cannot install vconfig utility. – Lain Iwakura May 5 '16 at 17:54
  • I edited option to try using ip utility. – MKT May 5 '16 at 19:31

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