我們在上一章完成了用代碼操作telnet，實現了遠程控制，分析前面的代碼會發現健壯性太低，需要進行優化，後續會通過開發一個交互式界面來完成人工介入操作網絡的過程。本次實驗目的：實現自動化創建環回口
首先更新拓撲，拉出新的路由器和一臺交換機
import telnetlib
import time
def main():
Host="192.168.10.100"
username="yerik"
password="1111"
commends=['enable','2222','conft']#相關指令
tn= telnetlib.Telnet(Host,port=23,timeout=10)
tn.set_debuglevel(2)
#login input username
tn.read_until('Username:') # 期待回覆
tn.write(username+'\n')
#input password
tn.read_until('Password:') # 期待回覆
tn.write(password+'\n')
tn.read_until('R1>')
forcommend in commends:
tn.write("%s\n"% commend)
'''
tn.read_until('R1#')
tn.write('configure')
time.sleep(1)
tn.write('t')'''
tn.read_until('R1(config)#')
loopback= 'int lo'
ipaddr= ' 255.255.255.255'
exit= 'exit'
fori in range(1,5):
loopbackn=loopback+str(i)
time.sleep(1)
tn.write("%s\n"% loopbackn)
ipaddrn='ipadd '+str(i)+'.'+str(i)+'.'+str(i)+'.'+str(i)+ipaddr
time.sleep(1)
tn.write("%s\n"% ipaddrn)
time.sleep(1)
tn.write("%s\n"% exit)
tn.close()
if __name__=='__main__':
main()
發現已經創建成功了
由於此時還沒有運行路由協議，請問有什麼辦法可以ping到這些環回口？使用ping中的嚴格源站路由技術，通過R2pingR1 在特權界面中，輸入ping
ping
Protocol [ip]:
Target IP address: 2.2.2.2
Repeat count [5]:
Datagram size [100]:
Timeout in seconds [2]:
Extended commands [n]: y
Source address or interface: 192.168.10.102
Type of service [0]:
Set DF bit in IP header? [no]:
Validate reply data? [no]:
Data pattern [0xABCD]:
Loose, Strict, Record, Timestamp, Verbose[none]:Strict
Source route: 192.168.10.101
Loose, Strict, Record, Timestamp,Verbose[SV]:
Sweep range of sizes [n]:
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2.2.2.2,timeout is 2 seconds:
Packet sent with a source address of192.168.10.102
Packet has IP options: Total option bytes= 7, padded length=8
Strict source route: <*>
(192.168.10.101)
Reply to request 0 (20 ms). Received packet has options
Total option bytes= 8, padded length=8
Strict source route:
(192.168.10.101)
<*>
Endof list
Reply to request 1 (28 ms). Received packet has options
Total option bytes= 8, padded length=8
Strict source route:
(192.168.10.101)
<*>
Endof list
Reply to request 2 (24 ms). Received packet has options
Total option bytes= 8, padded length=8
Strict source route:
(192.168.10.101)
<*>
Endof list
Reply to request 3 (16 ms). Received packet has options
Total option bytes= 8, padded length=8
Strict source route:
(192.168.10.101)
<*>
End oflist
Reply to request 4 (28 ms). Received packet has options
Total option bytes= 8, padded length=8
Strict source route:
(192.168.10.101)
<*>
Endof list
Success rate is 100 percent (5/5),round-trip min/avg/max = 16/23/28 ms
現實可以ping通