configuring a vpn with Zyxel 652

Hi,
I'm trying to set a vpn with a couple of ADSL zyxxel rouer (652), but I'm 
experiencing a few problems. Does anyone use the same routers, so to give me 
some hints?

Thanks,
Luca
--

-- 
Luca Ferrari,
fluca1978 <at> infinito.it
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