ARP usage under Linux

[ function]

Manages the ARP cache for the system.

[ description]

The ARP cache used to manage the system, commonly used commands include:

ARP: Displays all the table entries.

arp-d address: Deletes an ARP table entry.

Arp-s Address hw_addr: Sets an ARP table entry.

1. View the ARP table:

1[Email protected]222- the- -- -:~# arp #查看arp表2 Address hwtype hwaddress Flags Mask Iface3U50 etherxx: -: 9e:9c: $: theC eth14u52 ether c8:0a:a9: $: -: B1 C eth15U54 etherxx: -: 9e:9c: $: ad C eth16 222.132.16.49EtherTen: -: the: at: -:d 9 C Br0

2. View the ARP table and display it with IP instead of host name:

1[Email protected]222- the- -- -: ~# arp-N2 Address hwtype hwaddress Flags Mask Iface3 10.0.0.50Etherxx: -: 9e:9c: $: theC eth14 10.0.0.52Ether c8:0a:a9: $: -: B1 C eth15 10.0.0.54Etherxx: -: 9e:9c: $: ad C eth16 222.132.16.49EtherTen: -: the: at: -:d 9 C Br0

3. View the ARP table and display the host name and IP:

1U50 (10.0.0.50) atxx: -: 9e:9c: $: the[ether] on eth12U52 (10.0.0.52) at C8:0A:A9: $: -: B1 [ether] on eth13U54 (10.0.0.54) atxx: -: 9e:9c: $: ad [ether] on eth14? (222.132.16.49) atTen: -: the: at: -:d 9 [ether] on br0//? Indicates that the IP is not hard-resolved on this computer

4 . Add a pair of IP and mac address bindings:

#arp-S 10.1.1.1 00:11:22:33:44:55:66 #如果网络无法达到, then an error is reported

PS: Under normal circumstances can not succeed, slightly chicken!!

5. Delete an ARP table entry:

# arp-d 10.0.0.54

#arp-I eht1 10.0.0.54 #指定网卡删除;

6. Specify the MAC address of the reply:

#/usr/sbin/arp-i Eth0-ds 10.0.0.2 eth1 Pub

When Eth0 receives a request with an IP address of 10.0.0.2, it will be answered with Eth1 's MAC address.

For example, a dual-NIC machine runs this command:

/usr/sbin/arp-i Eth0-ds 10.0.0.2 eth1 Pub

There will be one more item:

10.0.0.2 * <from_interface> MP eth0

ARP usage under Linux