Redhat 9 and IP Masquerading

[Brian D. McGrew]

To clarify (sorry, I guess I was a bit vague).

Weather or not I have IP Forwarding turned on, I can't ping the 
internal network.  The box is configured as follows:

eth0 connected to DSL modem.  Works fine for web surfing.
eth1 connected to internal network via switch. (192.168.2.1)

 From the Redhat machine I can not ping any host on the internal network 
(192.168.2.[2-53]).  From any host on the internal network I can not 
ping the Redhat machine.

If I remove the Redhat machine from the network and plug the old router 
back in, life is good and all the hosts on the network can ping it and 
surf the web.  I know the issue is configuration with the RH box, not a 
connectivity problem.

BTW, the old router was 192.168.2.1 and it was physically removed and 
replaced with the RH machine which now has the same IP address 
(192.168.2.1) as the old router did (so we don't have to reconfigure 
the whole internal network).

If you need more details, just ask; sorry I was vague before.

Thanks,

-brian

Brian D. McGrew		{ brian at doubledimension.com || 
pacemakertaker at yahoo.com }
--
 > YOU!  Off my planet!
On Aug 25, 2004, at 11:42 AM, Stuart Sears wrote:

> On Wednesday 25 August 2004 18:14, Brian D. McGrew wrote:
>> Good morning All:
> hi Brian. A bit more info please...
>> I'm trying to setup a Redhat 9 machine to do IP Masquerading on our
>> internal network with a DSL modem.  We're using an old Dell PE2300
>> machine that seems to run the OS and X just fine.  We've got two NIC's
>> in the box, a Linksys and a Netgear; both are working.  I can put the
>> DSL on either card and get out to the world just fine.
> from internal hosts or just from the RH9 box?
>>
>> However, on the internal network I can not see nor ping any host.  The
>> internal IP of the machine is 192.168.2.1 (which is the same as the 
>> old
>> DSL router that was physically removed).  I can't ping anything.  I
>> look at an ifconfig -a printout and it shows zero packets received but
>> a whole lot of dropped packets.
> have you turned on ip forwarding on your RH9 box?
> edit /etc/sysctl.conf
> then run sysctl -p
>>
>> I was always under the impression that I should be able to ping the
>> 'router' from the internal network and I can not.  I've looked at
>> everything I can think of including 'Security Settings' and made sure
>> that (for now) the firewall is turned off (No Firewall).  What else
>> should I be looking at here, any ideas?
> to clarify here:
> you cannot ping the internal IP of your RH9 box, correct?
> ie 192.168.2.1
> or are you trying to ping hosts beyond it?
> what is the default gateway on your internal hosts?
> # netstat -rn
> how are they connected to the RH9 box?
>
>
> how have you set up the IP masquerading?
>
> Stuart
> -- 
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