我刚刚开始了一门关于计算机网络的课程,我的第一个作业为我提供了一个简单星形拓扑的迷你脚本,并要求我在h1和h2之间运行iperf测量。当iperf运行时,我应该测试h3和h4之间的ping。
我的问题是,我如何让iperf测量数据在后台运行,以便我可以测试ping,因为当iperf运行时我无法输入,也无法打开mininet的新终端。
发布于 2020-09-16 19:17:39
您有两个选择:
1-使用python API
2-从CLI运行并行进程
我将解释第二种选择,因为您正在使用CLI进行实验。
第一步:使用单一(星型)拓扑运行Mininet。
giuseppe@raspberrypi:~ $ sudo mn --topo single,4
*** Creating network
*** Adding controller
*** Adding hosts:
h1 h2 h3 h4
*** Adding switches:
s1
*** Adding links:
(h1, s1) (h2, s1) (h3, s1) (h4, s1)
*** Configuring hosts
h1 h2 h3 h4
*** Starting controller
c0
*** Starting 1 switches
s1 ...
*** Starting CLI:
mininet>如果你想从h1->h2执行iperf,你需要h2的IP,你可以用ifconfig找到它
mininet> h2 ifconfig
h2-eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 10.0.0.2 netmask 255.0.0.0 broadcast 10.255.255.255
inet6 fe80::b87a:eaff:fec1:64a0 prefixlen 64 scopeid 0x20<link>
ether ba:7a:ea:c1:64:a0 txqueuelen 1000 (Ethernet)
RX packets 98 bytes 14845 (14.4 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 11 bytes 866 (866.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0在h2中启动服务器,并在h2.log文件中记录stdout end stderr
mininet> h2 iperf -s &> h2.log &从h1到h2(ip=10.0.0.2)运行iperf客户机,并将输出保存在h1.log文件中(在本例中,我运行120秒,但您可以调整它)
mininet> h1 iperf -t 120 -c 10.0.0.2 &> h1.log &现在,您可以在iperf在后台执行时运行ping
mininet> h3 ping h4您可以打开另一个shell或在完成实验后查看日志
mininet> h3 ping h4
PING 10.0.0.4 (10.0.0.4) 56(84) bytes of data.
64 bytes from 10.0.0.4: icmp_seq=1 ttl=64 time=30.7 ms
64 bytes from 10.0.0.4: icmp_seq=2 ttl=64 time=1.84 ms
64 bytes from 10.0.0.4: icmp_seq=3 ttl=64 time=0.393 ms
64 bytes from 10.0.0.4: icmp_seq=4 ttl=64 time=0.387 ms
^C
--- 10.0.0.4 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 73ms
rtt min/avg/max/mdev = 0.387/8.327/30.692/12.925 ms
mininet> exit
*** Stopping 1 controllers
c0
*** Stopping 4 links
....
*** Stopping 1 switches
s1
*** Stopping 4 hosts
h1 h2 h3 h4
*** Done
completed in 473.135 seconds
giuseppe@raspberrypi:~ $
giuseppe@raspberrypi:~ $ ls
h1.log h2.log发布于 2020-09-16 23:05:48
您可以使用xterm:
xterm h1 h2 h3 h4
对于每个节点,您将获得四个xterm终端。然后,您可以在h1和h2之间运行iperf,并在h3和h4之间执行ping。
在h1上,运行:iperf -s &
在h2上,运行:iperf -s 10.0.0.1 -i 10 -t 60连接到h1。
在h3上,运行:ping 10.0.0.4 -c 10来ping h4,或者在h4上,运行ping 10.0.0.3 -c 10来ping h3。
https://stackoverflow.com/questions/63907768
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