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Cyber_Security_Notes/B. 第二阶段/拓扑练习/0829_ACL.md
Noriu d1674458be 2024年8月29日 16:40:56
2024-08-29 16:40:59 +08:00

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ACL

image-20240829150108770

一、IP

  • PC & Server

  • AR1

    [AR1]int g0/0/0
[AR1-GigabitEthernet0/0/0]ip add 192.168.1.254 24
[AR1-GigabitEthernet0/0/0]int g0/0/1
[AR1-GigabitEthernet0/0/1]ip add 192.168.2.254 24
[AR1-GigabitEthernet0/0/1]int g0/0/2
[AR1-GigabitEthernet0/0/2]ip add 192.168.3.254 24

二、ACL

  • AR1

    [AR1]acl 2000
[AR1-acl-basic-2000]rule 10 deny source 192.168.1.1 0.0.0.0
[AR1-acl-basic-2000]quit
[AR1]int g0/0/2
[AR1-GigabitEthernet0/0/0]traffic-filter outbound acl 2000

    解释：

    • [AR1]acl 2000：这个命令创建了一个编号为2000的基本ACL。在华为设备上，基本ACL的编号范围是2000-2999。

    • [AR1-acl-basic-2000]rule 10 deny source 192.168.1.1 0.0.0.0：这个命令在ACL 2000中添加了一条规则，规则编号为10。这条规则的作用是拒绝源IP地址为192.168.1.1的所有流量。0.0.0.0表示一个通配符掩码，这里它被用来指定一个精确的IP地址匹配，因为0.0.0.0表示所有比特位都必须匹配。

      具体来说，这条ACL规则做了以下事情：

      • rule 10：定义了规则的编号，规则编号决定了规则的执行顺序，编号越小，优先级越高。
      • deny：表示动作是拒绝匹配规则的流量。
      • source 192.168.1.1 0.0.0.0：定义了匹配条件，即源IP地址必须精确为192.168.1.1。

    • [AR1-GigabitEthernet0/0/0]traffic-filter outbound acl 2000：在g0/0/0接口上应用ACL 2000，以过滤出站流量。

    image-20240829162502210

三、测试

  • PC1

    • PING PC2

      PC>ping 192.168.2.1

Ping 192.168.2.1: 32 data bytes, Press Ctrl_C to break
Request timeout!
From 192.168.2.1: bytes=32 seq=2 ttl=127 time<1 ms
From 192.168.2.1: bytes=32 seq=3 ttl=127 time=15 ms
From 192.168.2.1: bytes=32 seq=4 ttl=127 time=16 ms
From 192.168.2.1: bytes=32 seq=5 ttl=127 time=15 ms

--- 192.168.2.1 ping statistics ---
  5 packet(s) transmitted
  4 packet(s) received
  20.00% packet loss
  round-trip min/avg/max = 0/11/16 ms

    • PING Server

      PC>ping 192.168.3.1

Ping 192.168.3.1: 32 data bytes, Press Ctrl_C to break
Request timeout!
Request timeout!
Request timeout!
Request timeout!
Request timeout!

--- 192.168.3.1 ping statistics ---
  5 packet(s) transmitted
  0 packet(s) received
  100.00% packet loss

  • PC2

    • PING PC1

      PC>ping 192.168.1.1

Ping 192.168.1.1: 32 data bytes, Press Ctrl_C to break
From 192.168.1.1: bytes=32 seq=1 ttl=127 time=16 ms
From 192.168.1.1: bytes=32 seq=2 ttl=127 time=16 ms
From 192.168.1.1: bytes=32 seq=3 ttl=127 time=15 ms
From 192.168.1.1: bytes=32 seq=4 ttl=127 time<1 ms
From 192.168.1.1: bytes=32 seq=5 ttl=127 time<1 ms

--- 192.168.1.1 ping statistics ---
  5 packet(s) transmitted
  5 packet(s) received
  0.00% packet loss
  round-trip min/avg/max = 0/9/16 ms

    • PING Server

      PC>ping 192.168.3.1

Ping 192.168.3.1: 32 data bytes, Press Ctrl_C to break
From 192.168.3.1: bytes=32 seq=1 ttl=254 time=16 ms
From 192.168.3.1: bytes=32 seq=2 ttl=254 time=15 ms
From 192.168.3.1: bytes=32 seq=3 ttl=254 time=16 ms
From 192.168.3.1: bytes=32 seq=4 ttl=254 time<1 ms
From 192.168.3.1: bytes=32 seq=5 ttl=254 time=16 ms

--- 192.168.3.1 ping statistics ---
  5 packet(s) transmitted
  5 packet(s) received
  0.00% packet loss
  round-trip min/avg/max = 0/12/16 ms