Linux-Shell records the MAC addresses of each host in the local area network

Shell- records the MAC addresses of each host in the local area network

Request:

Write a script called getarp.sh to record the MAC addresses of each host in the local area network.

Save to the / etc/ether file, which should be backed up first if it already exists.

One record per line, the first is listed as the IP address, and the third is listed as the corresponding MAC address.

Analysis:

Assuming that the network segment to be scanned is 192.168.10.0, 192.168.10. Assign a value to the variable NADD as a prefix to the detection address

Use arping-c 2-w 1 to send an ARP request to the IP of the testing host and record the MAC address

Use the while loop statement to detect the target host and record the MAC address. The host address range detected here is 1: 124.

1. Use vi to create a script called getarp.sh, which contains the following:

The screenshot is as follows:

The contents are as follows:

#! / bin/bash

NADD= "192.168.10."

FILE= "/ etc/ethers"

[- f $FILE] & & / bin/cp-f $FILE $FILE.old

HADD=1

While [$HADD-lt 124]

Do

Arping-c 2-w 1 ${NADD} ${HADD} & > / dev/null

If [$?-eq 0]

Then

Arp-n | grep ${NADD} ${HADD} | awk'{print $1meme 3}'> > $FILE

Fi

Let HADD++

Done

3. Add x permissions to the script getarp.sh

4. Execute the script to view the detected MAC information

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