Greetings,

>
> I have setup a dial out Bering firewall in a small office.  Recently I
> noticed that it often fails to hang up the modem even when all machines
> on the internal network have been turned off for long past the timeout
> value.   Possibly this is because of the increased number of worms
> hammering on the outside.  I replaced pppd with the active-filter
> version but had not researched how to implement it.  I shall try your
> active-filter line in /etc/ppp/options.  Thanks very much for your post
> and hope this solves the  "no hang up" the modem  problem.
>

I had the same problem (modem not hanging up due to incoming traffic) but
with with an isdn modem
Goggling through the net i found a SUSE article that had a active-filter
sentence which works very good (at least in my case)
The sentence is
active-filter 'outbound and not icmp[0] == 3 and not tcp[13] & 4 != 0'

Although the article refers to ipppd and isdn ,i think it will work the same
for pppd with active filter support, put i have not tested yet

Here is the link for future reference
http://sdb.suse.de/en/sdb/html/fhassel_ppp_filtering.html



Stelios



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