[ale] failover planning
Christopher Fowler
cfowler at outpostsentinel.com
Tue Nov 30 15:25:03 EST 2004
I've set 1 in all/arp_filter and each interface but the box is still
responding.
I even deleted arp tables on my desktop to see if that was the problem.
Maybe I need to set something else?
On Tue, 2004-11-30 at 14:56, Joe Steele wrote:
> On Tuesday, November 30, 2004 8:52 AM, Christopher Fowler wrote:
> >
> > Not fixed on 2.4.24
> >
> > I configured the 2nd interface on one of our devices running 2.4.24 as
> > 192.168.2.121 and there is no CAT-5 connected.
> >
> > [cfowler at cfowler cfowler]$ ping 192.168.2.121
> > PING 192.168.2.121 (192.168.2.121) 56(84) bytes of data.
> > 64 bytes from 192.168.2.121: icmp_seq=1 ttl=64 time=0.405 ms
> > 64 bytes from 192.168.2.121: icmp_seq=2 ttl=64 time=0.163 ms
> > 64 bytes from 192.168.2.121: icmp_seq=3 ttl=64 time=0.167 ms
> >
> >
> > I guess eth0 on 192.168.2.120 is responding for 192.168.2.121
> >
>
> This behavior is controlled by /proc/sys/net/ipv4/conf/*/arp_filter:
>
> arp_filter - BOOLEAN
> 1 - Allows you to have multiple network interfaces on the same
> subnet, and have the ARPs for each interface be answered
> based on whether or not the kernel would route a packet from
> the ARP'd IP out that interface (therefore you must use source
> based routing for this to work). In other words it allows control
> of which cards (usually 1) will respond to an arp request.
>
> 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.
>
> arp_filter for the interface will be enabled if at least one of
> conf/{all,interface}/arp_filter is set to TRUE,
> it will be disabled otherwise
>
> --Joe
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