https://www.masarlabs.com/noarp/

Masar Labs

NoArp kernel module

MasarLabs NoArp is a Linux kernel module that filters and drops unwanted ARP requests.

It is useful when you need to add an alias to the loopback interface to use a load balancer.

For more details about this problem see:

LVS-HOWTO: The ARP Problem (http://www.austintek.com/LVS/LVS-HOWTO/HOWTO/LVS-HOWTO.arp_problem.html)
ARP problem in LVS/TUN and LVS/DR (http://www.linuxvirtualserver.org/docs/arp.html)

You need NoArp 1.x for kernel 2.4.x.

You need NoArp 2.x for kernel 2.6.x.

Note: the preferred way to solve the ARP problem for kernel above version 2.6.6 is to add in /etc/sysctl.conf:

/etc/sysctl.conf

  1. net.ipv4.conf.lo.arp_ignore = 1
  2. net.ipv4.conf.lo.arp_announce = 2
  3. net.ipv4.conf.all.arp_ignore = 1
  4. net.ipv4.conf.all.arp_announce = 2

Download

You can download NoArp here (/download).

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