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 eth0.2

iface eth0.2 inet static

  address 192.168.2.1

  netmask 255.255.255.0

auto eth0.3

iface eth0.3 inet static

  address 192.168.3.1

  netmask 255.255.255.0

ifup eth0.2
ifup eth0.3

ifconfig eth0.2

eth0.2    Link encap:Ethernet  HWaddr 00:00:00:00:00:00
          inet addr:192.168.2.1  Bcast:12.168.2.255  Mask:255.255.255.0
          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:0
          RX bytes:0 (0.0 b)  TX bytes:0 (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 2
vconfig add eth0 3

# ifconfig eth0.2 192.168.2.1 netmask 255.255.255.0 broadcast 192.168.2.255 up

# ifconfig eth0.3 192.168.3.1 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 eth0.5 down
# vconfig rem eth0.5

3 通过ip

# ip link add link eth0 name eth0.2 type vlan id 2
# ip link
# ip -d link show eth0.2

# ip addr add 192.168.2.1/24 brd 192.168.2.255 dev eth0.2
# ip link set dev eth0.2 up

删除：

# ip link set dev eth0.2 down
# ip link delete eth0.2

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