linux 下网关MAC的查看和配置arp命令

linux 下网关MAC的查看和配置arp命令

[root@localhost ~]# arp

Address HWtype HWaddress Flags Mask Iface

203.171.xx.xx ether 00:D0:D3:3B:23:A8 C eth0

203.171.xx.ab ether 00:16:76:74:45:A1 C eth0

203.171.xx.ac ether 00:16:76:74:45:A1 C eth1

[root@localhost ~]# arp -a

? (203.171.xx.xx) at 00:D0:D3:3B:23:A8 [ether] . eth0

? (203.171.xx.ab) at 00:16:76:74:45:A1 [ether] . eth0

? (203.171.xx.ac) at 00:16:76:74:45:A1 [ether] . eth1

[root@localhost ~]# arp -h

Usage:

arp [-vn] [<HW>] [-i <if>] [-a] [<hostname>] <-Display ARP cache

arp [-v] [-i <if>] -d <hostname> [pub][nopub] <-Delete ARP entry

arp [-vnD] [<HW>] [-i <if>] -f [<filename>] <-Add entry from file

arp [-v] [<HW>] [-i <if>] -s <hostname> <hwaddr> [temp][nopub] <-Add entry

arp [-v] [<HW>] [-i <if>] -s <hostname> <hwaddr> [netmask <nm>] pub <-''-

arp [-v] [<HW>] [-i <if>] -Ds <hostname> <if> [netmask <nm>] pub <-''-

-a display (all) hosts in alternative (BSD) style

-e display (all) hosts in default (Linux) style

-s, --set set a new ARP entry

-d, --delete delete a specified entry

-v, --verbose be verbose

-n, --numeric don't resolve names

-i, --device specify network interface (e.g. eth0)

-D, --use-device read <hwaddr> from given device

-A, -p, --protocol specify protocol family

-f, --file read new entries from file or from /etc/ethers

<HW>=Use '-H <hw>' to specify hardware address type. Default: ether

List of possible hardware types (which support ARP):

strip (Metricom Starmode IP) ash (Ash) ether (Ethernet)

tr (16/4 Mbps Token Ring) tr (16/4 Mbps Token Ring (New)) ax25 (AMPR AX.25)

netrom (AMPR NET/ROM) rose (AMPR ROSE) arcnet (ARCnet)

dlci (Frame Relay DLCI) fddi (Fiber Distributed Data Interface) hippi (HIPPI)

irda (IrLAP) x25 (generic X.25) infiniband (InfiniBand)

[root@localhost ~]# cat /etc/ethers

cat: /etc/ethers: No such file or directory

添加静态项。这个很有用，特别是局域网中中了arp病毒以后

#arp -s 123.123.123.111 00:11:56:6F:87:D3

#arp -a .... 显示 ARP 表。

但是arp -s 设置的静态项在用户登出之后或重起之后会失效，如果想要任何时候都不失效，可以将ip和

mac的对应关系写入arp命令默认的配置文件/etc/ethers中

例如：

# vi /etc/ethers

arp -s 123.123.123.111 00:11:56:6F:87:D3

#arp -f /etc/ethers