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> (colin is the client, router the router). colin sends a ping to
> 100.100.100.100, and the router returns a packet, but the client seems
> to ignore it - ping continues to send packets and doesn't show an error
> message.
> 
> What's wrong?? This is really driving me crazy!

Out of the ipchains(8) manpage:

DENY means to drop the packet on the floor.  REJECT means  the  same  as drop,  
but  is  more  polite and easier to debug, since an ICMP message is sent back 
to the  sender  indicating  that the  packet  was  dropped.  (Note that DENY 
and REJECT are the same for ICMP packets.)

Since pings are ICMP packets, the manpage makes it sound like ipchains is not 
going to send any kind of useful message back to the client, even with a REJECT 
target. Instead of using an ipchains rule, though, you could try manually 
dropping the entry in your routing table that sends internet packets out to the 
ISDN line when you are not connected. One of your "route -n" entries should be 
the one with a default destination (0.0.0.0) and a gateway that is the IP of 
your ISDN device. Dropping this route ("route del default" I believe) when you 
are offline and re-adding it when you go online ("route add default gw 
IP.OF.ISDN.HERE") may cause the clients to get more useful messages. I stress 
MAY; I'm just guessing :)

-- Keith
Howe

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