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Cisco自反控制列表应用

.0

  ip access-group infilter in

  clock rate 64000

  !

  interface Serial1/1

  ip address 1.1.1.2 255.255.255.0

  ip access-group outfilter in

  注意:内外方向列表的应用不一定要在同一个接口下。

  Ok,我们现在R1上测试一下ping结果:

  R1#ping 2.2.2.2

  Type escape sequence to abort.

  Sending 5, 100-byte ICMP Echos to 2.2.2.2, timeout is 2 seconds:

  !!!!!

  Success rate is 100 percent (5/5), round-trip min/avg/max = 136/213/268 ms

  R1#ping 30.1.1.1

  Type escape sequence to abort.

  Sending 5, 100-byte ICMP Echos to 30.1.1.1, timeout is 2 seconds:

  !!!!!

  Success rate is 100 percent (5/5), round-trip min/avg/max = 72/164/268 ms

  R1#

  再测试一下telnet结果:

  R1#

  R1#telnet 2.2.2.2

  Trying 2.2.2.2 ... Open

  User Access Verification

  Username: test

  Password:

  R3#

  R1#telnet 30.1.1.1

  Trying 30.1.1.1 ... Open

  User Access Verification

  Username: test

  Password:

  R3#(结果全部ok,符合题目要求)

  我们再在R3执行相同的测试:

  R3#

  R3#ping 1.1.1.1

  Type escape sequence to abort.

  Sending 5, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:

  U.U.U

  Success rate is 0 percent (0/5)

  R3#ping 10.1.1.1

  Type escape sequence to abort.

  Sending 5, 100-byte ICMP Echos to 10.1.1.1, timeout is 2 seconds:

  U.U.U

  Success rate is 0 percent (0/5)

  R3#telnet 1.1.1.1

  Trying 1.1.1.1 ...

  % Destination unreachable; gateway or host down

  R3#telnet 10.1.1.1

  Trying 10.1.1.1 ...

  % Destination unreachable; gateway or host down

  R3#(由于不能允许由外部直接发起的流量通过,所以测试全部失败,但结果是正确的,对吗?)

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