[plug] Dumb questino on networking

Gary Allpike spice at q-net.net.au
Tue Jul 7 15:39:53 WST 1998

On Tue, 7 Jul 1998 15:17:39 +0800 (WST), you wrote:

>I have the opportunuty to replace a NT box with a linux machine, if I
>can gt it working as a gateway, QUICKLY.
>I sugessted a talk on this some time ago.  Somebody ( I cant remember 
>who) , said that it was so trivial that it was unneccesary.
>As it is so trivial, I know that no-one will mind answering this.
>ppp is no problem.  Ethernet is no problem.  But I dont understand the finer point
>of network routing.  Yes, I have compiled the kernel with
>gateway support.  And I have set up all the routes in the table.
>Here is the table:
>Kernel routing table
>Destination     Gateway         Genmask         Flags MSS    Window Use Iface
>     *      UH    1500   0        0 ppp0
>     *        U     1500   0        1 eth0
>       *            U     3584   0        1 lo
>default     *               UG    1500   0        6 ppp0
>WIN95 machines can connect to the linux box, but when trying to connect 
>to the world,  no reply is received.  The linux box can connect to the world,
>so it has to be a forwarding/gateway problem.
>How can I find out where all the IP packets which are comming in through 
>eth0 are going to?  They are certainly not going to the ppp0 
>like they ought to.  I have never done this before , and I have never used WIN95 
>either anyone know how to find out what's going on?


By the look of the IP numbers you have on the ethernet interface, you
either need to

1.  Run proxy software (such as socks5) 


2. Use IP masquerading.

Number 2 is the best option in my opinion.  This involves compiling a
kernel with masq support, and inserting the appropriate protocol
modules into the kernel.  You will also need a ipfwadm line to enable
the masquerading.  This is an example :

ipfwadm -F -a m -S

If you need any more help on this, please email me or call me.


Gary Allpike

Gary Allpike - spice at q-net.net.au
System Administrator
Q-Net Australia    http://www.q-net.net.au
Ph: +61-8-9386 1178   Fax: +61-8-9386 8200

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