It could be a problem of your pppd config. or even,and more probably,
a router filter config. where the DNS or NetBios queries are not
blocked,so box 2 ask for DNS and router trigger the call to ISP.
This has been a problem I had with Zyxel Prestige Router series
and you can stop by using Zyxel internal filtering rules.

-- 
Regards,: Marco Calistri <[EMAIL PROTECTED]>
gpg key available on http://www.qsl.net/ik5bcu
Xfmail 1.4.7p2 on linux RedHat 7.1 kernel-2.4.2
--
Trust in Allah, but tie your camel.
                -- Arabian proverb

On 11-May-2001 Tom Beer wrote:
> Hi,
> 
> one of my linux boxes builds up unintended dial ups via my
> second box. A tcpdump shows that the last visited
> http pages (but not only these) will be called again. this
> is independent from the linux kernel (2.2.16 as 2.4.3 as 2.4.4)
> and from the netscape version (4.75 and 6.01). Presumably the
> problem is neither netscape nor the kernel. But where to start
> troubleshooting? If I close my isdn interface and reopen it
> some minutes ago, no further connections will be
> established. If I don't close it, connections up  to 40 minutes every
> two minutes or so will be an attempt to established no connections.
> 
> Thanks Tom
> 
> ------------------------------------------
>                       |                                       |
>                       |                                       |
>               box 1    
>               box 2 (router)
>               site requests                   named 
> 
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