Re: how to connect firewall to router

hamals_at_infinito.it
Date: 01/28/04 

Date: Wed, 28 Jan 2004 15:00:48 GMT

Thanks for reply

your explaination is very good....but if my adsl router has only one port on
lan side and this port is the firewall port, how can the firewall catch the
traffic for other IPs and direct it to the right pc?

MyndPhlyp wrote:

>
> <hamals@infinito.it> wrote in message
> news:cHPRb.292508$e6.11316901@twister2.libero.it...
>> Thanks John for reply bu my problem is that:
>> router put all the internet traffic to the network interface of my
>> firewall...but if the address of this network interface is 152.3.0.1 ,
>> how can it accept traffic for 152.3.0.10 (that it is on the safe side of
>> firewall) and direct it to the right pc?
>
> Since your ADSL modem's IP address is 152.3.0.1 and your Linux machine's
> IP address is 152.3.0.10, it's a pretty good assumption your network's
> assigned address range is from 152.3.0.0 through 152.3.0.15 inclusive.
> Under this assumption, the netmask on your ADSL modem is 255.255.255.240.
> Your network's address is 152.3.0.0 and your network's broadcast address
> is 152.3.0.15 allowing your ADSL modem, and any other LAN device(s) with a
> public IP address, to reside in the range of 1-14.
>
> The ADSL modem acts as a router. The netmask and it's public address
> extrapolate into the valid address(es) to pass through the ADSL modem.
>
> On the LAN side of the ADSL modem, it now depends on just what the
> capabilities of the ADSL modem are. A multiport ADSL modem will act as a
> switch and learn which IP address(es) are hanging off which port and
> adaptively route the packet to the correct port. A single port ADSL modem
> doesn't care.
>
> Hope that helps clear up the confusion a bit.

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