You can also try arping but, it sounds like they have settings on their end ment to prevent arp poisining. Its not that tireir router is stupid just told ot ignore you because they think your arps might be malicious.
Although it sounds like from your first post you are trying to use the same ip address on two different ISP's if that is the case that will never work unless both connections are dark fiber because of how internet routing works.

On May 3, 2012 9:52 AM, "Anton Melser" <melser.anton@gmail.com> wrote:
Thanks for the suggestion - looks like the router is just too stupid
(Orange France :-(). I just noticed there is some code that has been
added for VMACs in 1.2.0 and that testing is needed! Am I not a
perfect candidate? :-) If so, what can/should I do?
Cheers
Anton


On 2 May 2012 16:11, Graeme Fowler <graeme@graemef.net> wrote:
> On Wed, 2012-05-02 at 15:41 +0200, Anton Melser wrote:
>> Any ideas?
>
> Use the notify_master script to send several targeted ICMP pings to the
> default gateway from the address (or addresses) which has just become
> "live".
>
> Alternatively use a script from cron every minute to enumerate all the
> interfaces on the system and their associated addresses, then send some
> targeted ICMP from each address to the default gateway.
>
> If that doesn't work, change provider!
>
> Graeme
>
>
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