tunctl used & bridge sub interface network used with multi-network env-白红宇

虚拟网络接口的创建和使用, 另外如果使用了网桥的情况下, 虚拟机如果配置的网段和主机不同, 并且没有trunk口没有路由器的情况下, 虚拟机和主机之间通讯的方法.

安装tunctl

# yum install -y tunctl

添加一个虚拟网络设备

# tunctl -u nobody -g nobody -t tap0 -p

将虚拟网络设备激活

# ifconfig tap0 up

查看链路状态

# ip link 15: tap0: 
     
       mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 500    link/ether 5a:6c:f8:ee:ad:5b brd ff:ff:ff:ff:ff:ff

将虚拟网络设备添加到网桥

# brctl addif ovirtmgmt tap0

将虚拟网络设备从网桥删除

# brctl delif ovirtmgmt tap0

删除一个虚拟网络设备

# tunctl -d tap0

当一个网桥中有多个IP段需要使用时, 并且没有路由器的情况下, 如果要通讯的话, 需要在主机上配置多个网段, 相同网段之间进行通讯.

配置网桥的子接口IP

# cd /etc/sysconfig/network-scripts/# brctl showbridge name     bridge id               STP enabled     interfaces;vdsmdummy;             8000.000000000000       noovirtmgmt               8000.00221960778f       no              em1                                                        vnet0# cp ifcfg-ovirtmgmt ifcfg-ovirtmgmt:1# vi ifcfg-ovirtmgmt:1DEVICE=ovirtmgmt:1BOOTPROTO=staticONBOOT=yesBROADCAST=172.16.13.255IPADDR=172.16.13.150NETMASK=255.255.255.0NM_CONTROLLED=no

例如 :

HOSTA - if0(172.16.3.0/24, 172.16.13.0/24)HOSTB - if0(172.16.3.0/24, 172.16.13.0/24)VMA - if0(172.16.13.0/24)VMB - if0(172.16.13.0/24)

以上都可以相互通讯.

[参考]

1. man tunctl

[root@150 network-scripts]# man tunctlTUNCTL(8) TUNCTL(8)NAME tunctl - create and manage persistent TUN/TAP interfacesSYNOPSIS tunctl [ OPTIONS ] [ -u owner ] [ -t device-name ] tunctl -d device-nameDESCRIPTION tunctl allows the host sysadmin to preconfigure a TUN/TAP network interface for use by a particular user. That user may open and use the network/write side of the interface, but may not change any aspects of the host side of the interface.OPTIONS -b Brief output, prints just the interface name -n Create a point-to-point TUN interface without Ethernet header. Automatically enabled if the desired interface name starts with "tun". -p Create a TAP type interface with Ethernet header. Automatically selected if the desired interface starts with "tap" or if no interface name is given. -f tun-clone-device Specifies the tun clone device name. The default is /dev/net/tun, but some systems use /dev/misc/net/tun instead. -d interfacename Delete the specified interfacename (set it to non-persistent) -u user Specifies the owner of the interface. This user is allowed to attach to the "network/wire" side. -g group Specifies the group of the interface. This group is allowed to attach to the "network/wire" side of the interface. -t interface Specifies the desired interface name.USAGE To create an interface for use by a particular user, invoke tunctl without the -d option: # tunctl -u someuser Set ’tap0’ persistent and owned by ’someuser’ Then, configure the interface as normal: # ifconfig tap0 192.168.0.254 up # route add -host 192.168.0.253 dev tap0 # bash -c ’echo 1 > /proc/sys/net/ipv4/conf/tap0/proxy_arp’ # arp -Ds 192.168.0.253 eth0 pub To delete the interface, use the -d option: # tunctl -d tap0 Set ’tap0’ nonpersistentSEE ALSO The UserModeLinux-HOWTO

AUTHOR tunctl was originally written by Jeff Dike

as part of the User Mode Linux tools. Current version is maintained as a separate package by Henrik Nordstrom

. This manual page was originally written by Matt Zimmerman

for the Debian GNU/Linux system, based on examples from Jeff Dike. Extended by Henrik Nordstrom

to cover all options supported. July 9, 2008 TUNCTL(8)