[ale] failover planning

[Christopher Fowler]

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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