zoukankan      html  css  js  c++  java
  • tap interfaces disabled in linux bridge


    https://serverfault.com/questions/540831/tap-interfaces-always-disabled-in-linux-bridge


    tap interfaces always disabled in linux bridge

    I have a physical interface eth0, and I want to create two virtual interfaces and bridge them with eth0. For this purpose I do:

    #Create the virtual interfaces
    tunctl -t tap0
    tunctl -t tap1
    ifconfig tap0 up
    ifconfig tap1 up
    
    #Create the bridge
    brctl addbr br0
    brctl stp br0 off
    brctl addif br0 eth0
    brctl addif br0 tap0
    brctl addif br0 tap1
    
    #Turning up the bridge
    ifconfig br0 up

    However my problem if that the tap interfaces always appear disabled in the bridge, and no traffic flows to them.

    $brctl show br0
    bridge name bridge id       STP enabled interfaces
    br0     8000.080027cabeba   no          eth2
                                            tap0
                                            tap1
    
    $brctl showstp br0
    br0
     bridge id      8000.080027cabeba
     designated root    8000.080027cabeba
     root port         0            path cost          0
     max age          20.00         bridge max age        20.00
     hello time        2.00         bridge hello time      2.00
     forward delay        15.00         bridge forward delay      15.00
     ageing time         300.01
     hello timer           0.00         tcn timer          0.00
     topology change timer     0.00         gc timer         298.42
     flags          
    
    
    eth2 (1)
     port id        8001            state            forwarding
     designated root    8000.080027cabeba   path cost          4
     designated bridge  8000.080027cabeba   message age timer      0.00
     designated port    8001            forward delay timer   12.97
     designated cost       0            hold timer         1.24
     flags          
    
    tap0 (2)
     port id        8002            state              disabled
     designated root    8000.080027cabeba   path cost        100
     designated bridge  8000.080027cabeba   message age timer      0.00
     designated port    8002            forward delay timer    0.00
     designated cost       0            hold timer         0.00
     flags          
    
    tap1 (3)
     port id        8003            state              disabled
     designated root    8000.080027cabeba   path cost        100
     designated bridge  8000.080027cabeba   message age timer      0.00
     designated port    8003            forward delay timer    0.00
     designated cost       0            hold timer         0.00
     flags    

    Is there any way to set the tap interfaces in forwarding state? I do not understand why they are not because STP is disabled.

    Cheers

    Daniel

    ==========================================================================================

    Answer

    Carrier (IFF_RUNNING) is only set on a tap when a user has the device handle open.

    For a persistent tap created with tunctl, you need an application which attaches to the tap, eg:

    or

            http://blog.csdn.net/ztguang/article/details/72890346


  • 相关阅读:
    网络
    DB
    DevOps
    Linux 进程管理:Supervisor
    Tomcat相关知识
    Tomcat配置和数据源配置
    Eclipse智能提示及部分快捷键
    Servlet工作原理
    蜗牛
    Servlet技术
  • 原文地址:https://www.cnblogs.com/ztguang/p/12644661.html
Copyright © 2011-2022 走看看