配置网卡为vlan trunk

http://www.microhowto.info/tutorials/802.1q.html

Configure an Ethernet interface as a VLAN trunk

host需要连接2个 VLANs， 192.168.2.1/24 on VLAN 2 and 192.168.3.1/24 on VLAN 3

# modprobe 8021q

# lsmod | grep 8021q

3种方法：

1 通过配置文件

auto eth0.

iface eth0. inet static

  address 192.168.2.1

  netmask 255.255.255.0

auto eth0.

iface eth0. inet static

  address 192.168.3.1

  netmask 255.255.255.0

ifup eth0.
ifup eth0.

ifconfig eth0.

eth0.    Link encap:Ethernet  HWaddr :::::
          inet addr:192.168.2.1  Bcast:12.168.2.255  Mask:255.255.255.0
          UP BROADCAST MULTICAST  MTU: Metric:
          RX packets: errors: dropped: overruns: frame:
          TX packets: errors: dropped: overruns: carrier:
          collisions: txqueuelen:
          RX bytes: (0.0 b)  TX bytes: (0.0 b)

如果需要指定连到那个物理网卡：

auto vlan2
iface vlan2 inet static
  address 192.168.2.1
  netmask 255.255.255.0
  vlan-raw-device eth0

http://www.microhowto.info/tutorials/802.1q.html

2 Vconfig

vconfig add eth0
vconfig add eth0 

# ifconfig eth0. 192.168.2.1 netmask 255.255.255.0 broadcast 192.168.2.255 up

# ifconfig eth0. 192.168.3.1 netmask 255.255.255.0 broadcast 192.168.3.255 up

获取VLAN interface的详细信息

# cat /proc/net/vlan/eth0.5

删除VLAN interface

# ifconfig eth0. down
# vconfig rem eth0.

3 通过ip

# ip link add link eth0 name eth0. type vlan id
# ip link
# ip -d link show eth0.

# ip addr add 192.168.2.1/ brd 192.168.2.255 dev eth0.
# ip link set dev eth0. up

删除：

# ip link set dev eth0. down
# ip link delete eth0.

配置完后，来ping eth0的ip，会发生eth0可以收到并回复，但eth0.2收到但不回复。

http://blog.csdn.net/suiyuan19840208/article/details/8221529