Dan Swartzendruber wrote:
>
> At 10:43 PM 2/27/00 +0000, James Lewis wrote:
>
> >I have 3 NT workstations on an internal LAN, going through ipmasq (on
> >2.2.13) which is providing NAT. General services such as web browsing, FTP
> >etc, are working fine but we are experiencing very annoying problems with
> >Microsoft Outlook 2000 (running in 'Corporate Workgroup mode) running on
> >the 'Internal' machines connecting to an External Exchange server with a
> >public IP.
> >
> >The problems seem to be because the exchange server is seeing requests
> >from 3 different machines coming from the single IP address of the NAT
> >machine
>
> This is peculiar. I have a client who is doing the same thing (well, the
> NAT is being done by a cisco router between internal and external LANs),
> and they have no problems getting to the exchange server. Can you be more
> specific about what the problems are?
NAT includes IP-Masquerade, but IP-Masquerade is not all of NAT.
In
other words, IPMasq is a subset of NAT.
Cisco routers can do a Many-One IPMasquerade type of translation.
They can also do Many-Many translation. This provides firewall
services, but each internal machine maps to a separate real IP
address. It does not help with conservation of IP's, but would
certainly help with the problem described above. Provided, of
course, you can obtain 3 IP addresses from your supplier instead
of the present one.
I am not certain, but full fledged NAT may be available for Linux.
Does anyone know for certain?
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Ramon Gandia ============= Sysadmin ============== Nook Net
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