My little Information Technology blog
Use this easy parsing command using uniq to pull duplicates out of the arp table dump that you can grab from your routers.
cat arp_dump_XXXXXXXXX.txt | awk ‘{print $1″ “$3}’ | uniq -D -w 17
That gives you the duplicates from row 1 and the read out of row 3 which is the IP address and Name.
For Red Hat distributions, you will edit:
/etc/sysconfig/network-scripts/ifcfg-eth#
For Debian distributions, you will edit:
/etc/network/interfaces
If you are running DHCP, or Static and want to swap between the settings, here are two examples for your use:
DHCP will look something like this:
DEVICE=eth0
BOOTPROTO=dhcp
HWADDR=00:D0:B7:08:09:BB
ONBOOT=yes
STATIC will look something like this: