我使用过的Linux命令之arp - 操作ARP缓存

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用途说明

显示和修改地址解析协议(ARP)使用的“IP 到物理”地址转换表。手册页上的说法是“操作系统ARP缓存”，manipulate the system ARP cache。

常用参数

arp 显示当前的ARP缓存列表。

arp -s ip mac 添加静态ARP记录，如果需要永久保存，应该编辑/etc/ethers文件。

arp -f 使/etc/ethers中的静态ARP记录生效。

使用示例

示例一

[root@rhel55 src]# arp
Address????????????????? HWtype? HWaddress?????????? Flags Mask??????????? Iface
192.168.6.106??????????? ether?? 70:1A:04:CC:2B:21?? C???????????????????? eth0

[root@rhel55 src]# ping 192.168.6.1
PING 192.168.6.1 (192.168.6.1) 56(84) bytes of data.
64 bytes from 192.168.6.1: icmp_seq=1 ttl=64 time=1.65 ms
64 bytes from 192.168.6.1: icmp_seq=2 ttl=64 time=0.888 ms
Ctrl+C
--- 192.168.6.1 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 999ms
rtt min/avg/max/mdev = 0.888/1.270/1.653/0.384 ms
[root@rhel55 src]# arp
Address????????????????? HWtype? HWaddress?????????? Flags Mask??????????? Iface
192.168.6.1????????????? ether?? 00:22:6B:8C:70:3D?? C???????????????????? eth0
192.168.6.106??????????? ether?? 70:1A:04:CC:2B:21?? C???????????????????? eth0

[root@rhel55 src]# vi /etc/ethers

192.168.6.1???? 00:22:6B:8C:70:3D

[root@rhel55 src]# arp -f
[root@rhel55 src]# arp
Address????????????????? HWtype? HWaddress?????????? Flags Mask??????????? Iface
192.168.6.1????????????? ether?? 00:22:6B:8C:70:3D?? CM ??????????????????? eth0
192.168.6.106??????????? ether?? 70:1A:04:CC:2B:21?? C???????????????????? eth0

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Flags Mask，C表示arp cache中的内容，M表示是静态ARP entry。

示例二

[root@web ~]# arp
Address????????????????? HWtype? HWaddress?????????? Flags Mask??????????? Iface
218.23.142.41??????????? ether?? 00:05:DC:E3:1F:BC?? C???????????????????? eth1
192.168.6.12???????????? ether?? 00:19:0F:03:37:D3?? C???????????????????? eth0
218.23.142.42??????????? ether?? 00:15:E9:47:AE:74?? C???????????????????? eth1

问题思考

相关资料

【1】Guide to IP Layer Network Administration with Linux Address Resolution Protocol (ARP)

【2】百度空间 Linux Arp命令列表简单介绍

【3】51CTO.COM linux下防范arp欺骗攻击

【4】百度空间yk linux下arp攻击的解决方案［原］

【5】百度空间yk linux下arp攻击的解决方案续(完美解决版)［原］

【6】Guide to IP Layer Network Administration with Linux B.1. arp

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