link dynamips to the real ethernet card

测试平台：
Thinkpad R60
RHEL5
dynagen 0.10.1.090807
dynamips 0.2.8-RC2-x86


1>安装bridge-utils
#rpm -ivh bridge-utils-1.1-2.i386.rpm
warning: bridge-utils-1.1-2.i386.rpm: Header V3 DSA signature: NOKEY, key ID 4f2a6fd2
Preparing...                ########################################### [100%]
   1:bridge-utils           ########################################### [100%]
#brctl
Usage: brctl [commands]
commands:
        addbr                           add bridge
        delbr                           delete bridge
        addif                  add interface to bridge
        delif                  delete interface from bridge
        setageing                set ageing time
        setbridgeprio            set bridge priority
        setfd                    set bridge forward delay
        sethello                 set hello time
        setmaxage                set max message age
        setpathcost       set path cost
        setportprio       set port priority
        show                                    show a list of bridges
        showmacs                        show a list of mac addrs
        showstp                         show bridge stp info
        stp             {on|off}       turn stp on/off


2>配置文件：
`router rta`
    model = 2691
    slot1 = NM-4T
    f0/0 = NIO_tap:tap0
    s1/0 = rtb s1/0

3>运行dynagen，tap0在dynagen运行起来后就被自动创建了。


4>建立接口绑定：
#brctl addbr br0
#brctl addif br0 eth0
#brctl addif br0 tap0

5>配置接口：
#ifconfig tap0 up
#ifconfig eth0 0.0.0.0 up
#ifconfig br0 192.168.1.99 255.255.255.0


6>在dynagen启动相应虚拟设备：
=> start rta


7>测试：
rta#sh run int f0/0
Building configuration...

Current configuration : 97 bytes
!
interface FastEthernet0/0
 ip address 192.168.1.91 255.255.255.0
 duplex auto
 speed auto
end

rta#ping 192.168.1.99

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.1.99, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/4/8 ms
rta#