Re: ICS quandary

From: Bill Grant (not.available_at_online)
Date: 02/25/04 

Date: Wed, 25 Feb 2004 11:45:45 +1000

  The problem isn't the routing, it is address translation. The packet may
be routed to the Internet, but it will then be lost because it is a private
IP. Because the client and the LAN machines are already in the same IP
subnet, you can't really use routing. The client uses proxy ARP to contact
LAN machines in the same subnet.

    NAT and ICS enable the private packet to use the "server's" public IP.
In ICS, this just happens and is not configurable. In RRAS/NAT, you
configure which interfaces are the private side input to NAT, and which
interface(s) are public.

    The netsh command described in KB 310888 is a method to make the
"internal" interface (to which the RAS client connects) an input to NAT, so
that it uses a public IP externally. This is required because you cannot
"see" this interface in the NAT display in the RRAS console. (This has been
fixed in W2k3. You can now do it from the console.)

    The only other method which works involves using demand-dial interfaces.
But this solution is only possible with RRAS/NAT, not ICS.

"Kurt" <kurtl@olypen.com> wrote in message
news:103mnis9i0b6kb8@corp.supernews.com...
>
> Sorry, that command line to add a default route in windows is
>
> route add 0.0.0.0 mask 0.0.0.0 <ip address of NIC2>
>
> Got routers on the brain.
>
>
> "Kurt" <kurtl@olypen.com> wrote in message
> news:103lnijg2boj137@corp.supernews.com...
> > I've never tried it, but I'll take the role of the protagonist here and
> say
> > that I think you could get it to work, but it'll take a little
> > unconventional thinking. When you dial in, do you get an IP address on
the
> > LAN (you can ping the W2K box)? If that is the case, you should be able
to
> > manually specify the default route as the private interface (NIC2) as
the
> XP
> > pro's default gateway. (from command line > ip route 0.0.0.0 mask
0.0.0.0
> > <NIC2 IP Address>). You would also need to manually set your DNS server
to
> > point to your ISP's (cable provider's) DNS server. That might route
> packets
> > via the shared connection. It's worth a try.
> >
> > ...kurt
> >
> > "Brian" <Brian@NOSPAMparishmotel.com> wrote in message
> > news:auVZb.37518$um1.4484@twister.nyroc.rr.com...
> > > It sure seems like I should be able to do this but I cannot get it to
> > work.
> > > I have a Win2K Pro machine connected via cable modem and static IP
with
> 2
> > > NICs. Nic 1 to the cable modem/static IP and Nic 2 to an internal
> network
> > > pulling an IP from winproxy. I can easily live without Nic 2 if it
would
> > > help.
> > > I connected a brand new USR v.92 to the 2K Pro machine and set up an
> > > Incoming Connection. I set Nic 1 to share it's stuff and play nice.
> Taking
> > > Nic 2 out of the machine causes Nic 1 not to have a sharing tab btw.
> > > Now I dial into 2K pro from XP pro, make a nice quick clean connection
> > that
> > > shows data moving to and fro in the status box BUT I can't do anything
> > over
> > > the net from the XP machine. It acts like there is no DNS, it just
> cannot
> > > find hosts.
> > >
> > > All I want to do is connect to my own network from hotels to avoid
> paying
> > > for an isp and hotel phone charges. If I get this working I'll put a
> toll
> > > free # on the modem.
> > >
> > > Thanks for any help
> > > Brian
> > >
> > > P.S. No virus scanners or firewalls involved.
> > >
> > >
> >
> >
>
>

Relevant Pages

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