Query regarding ARP request on a multi-homed system

[Dave Tian]

arp_filter may fit better.

	0 - (default) The kernel can respond to arp requests with addresses
	from other interfaces. This may seem wrong but it usually makes
	sense, because it increases the chance of successful communication.
	IP addresses are owned by the complete host on Linux, not by
	particular interfaces. Only for more complex setups like load-
	balancing, does this behaviour cause problems.

-daveti



On Jun 26, 2014, at 12:38 AM, wei zhang <asuka.com at 163.com> wrote:

> 
> At 2014-06-26 02:13:30, "Chaitra Ramaiah" <linux.delve at gmail.com> wrote:
> >Hi,
> >
> >  Have a doubt regarding ARP behavior in case of a multi-homed linux box.
> >
> >  Assume there are two interfaces eth0 and eth1 each configured with
> >IPs belonging to differrent
> >  subnets. Say IP1 is assigned to eth0 and IP2 to eth1. Now if an ARP
> >request comes on eth0
> >  for IP2, what is the behavior on Linux?
> 
> I'm not familiar with networking, but arp_announce and arp_ignore in 
> Documentation/networking/ip-sysctl.txt maybe the answer!
> 
> >
> >  Thanks in advance for your answers.
> >
> >Thanks,
> >Chaitra
> >
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