Networking

Warning: Do not try any of these unless you know what exactly you intend to do. Trying some of these commands and tricks may lead to security risks.

ARP

manipulating ARP timeout

• To see what your current ARP timeout is (default is 60 seconds)
  cat /proc/sys/net/ipv4/neigh/ethX/gc_stale_time
• To change the ARP timeout
  echo _timeout_ > /proc/sys/net/ipv4/neigh/_ethX_/gc_stale_time
  Here timeout is the new value (in seconds)of ARP timeout. Change the ethX to your interface's name.
  Source

Static ARP table entries

To avoid arp requests packets from being sent, you can manually add an arp entry:

• arp -s _ipaddr_ _macaddr_
  change the ipaddr and macaddr to the destinations IP address and MAC address.
  Source