Re: [WinMac] static & dynamic IP?
From: Tom Roth (tomroth[at]wfubmc.edu)
Date: Mon Jul 31 2000 - 11:16:11 PDT
Thanks for the advice. I was wondering about how he'd define the static
IP numbers.
> Darryl Lee wrote:
>
> Ron wrote:
> > This is where you need a firewall or proxy server which will translate
> > (using NAT - Network Address Translation) the ISP's addresses to his home
> > LAN addresses.
>
> BZZZZT. C'mon Ron, he explicitly said that his boss is *not* trying
> to share the dial-up access with the other computers. :}
>
> > Alternatively the one machine which is trying to connect to the ISP can
> > have 2 LAN cards; one with a fixed IP address on the home LAN, the other
> > with a DHCP (dynamic) address assigned from the ISP. Be aware that with the
> > latter approach, it is possible for anyone on the internet to hack the
> > person's home network via the two-card PC.
>
> BZZZZZZT. Using NT as a base of operations to hack into a local
> LAN over a dial-up connection? Well let's see: NT doesn't really
> have a "shell" from where you can launch nasty commands (as Unix
> might let you, although i suppose you could install a trojan or
> three, which could cleverly read local traffic and send it back to
> you.) But let's remember that he has a dynamic *dial-up* connection?
> What kind of fun would hacking over that be? You'd have to find
> out when the guy was on-line, *and* guess what his IP was for every
> session. And then it'd be *slow*.
>
> And 2 LAN cards? i remind you that he's dialing up, not using a
> cable modem or DSL. Just one LAN card.
>
> Anyways, Tom, all your boss really needs is another Ethernet card. He
> can assign a static IP address to that, completely independent of the
> dynamic IP address that his ISP assigns.
>
> For his private LAN he should use one of the range of IP addresses
> specifically allocated for this purpose: 192.168.1.0 - 192.168.254.254
> OR 10.0.0.1 - 10.254.254.254
> OR 172.16.0.1 - 172.31.254.254
>
> So: NT machine's ethernet card: 192.168.1.1
> Other machine: 192.168.1.10
> Another machine: 192.168.1.20
>
> They should be able to ping each other. However, the case could be
> made that if you have less than 5 computers that just need to share
> some files, that maybe the only protocol you should run on the cards
> is NetBEUI so that when the boss enables file/print sharing, the
> intrepid (and amazingly lucky) hacker won't be able to see the shares
> over his slow modem connection. Or maybe that's just a binding issue.
> It's been a while since i've set this up.
>
> Ack... i've typed far too much.
>
> --Darryl
>
> > At 08:52 2000-07-31, you wrote:
> >
> > >My boss is trying to setup a home network while still retaining his
> > >dial-up ISP connection. He is NOT trying to share the dial-up access
> > >with the other computers. He just wants the other two or three
> > >computers to be able to connect to each other. No server is involved.
> > >His Windows NT computer gets it's IP number from the ISP when it
> > >connects. Yet for home use, it seems that he would need a static IP so
> > >the other computers can find the WinNT computer. I know home networks
> > >have been discussed here on WinMac before so I would think some of you
> > >may have run across this very same problem. Any suggestions would be
> > >appreciated.
> > >
> > >Thanks!
>
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--
___________________________________________________________________
Tom Roth Wake Forest University School of Medicine
tomroth@wfubmc.edu Dept of Biomedical Communications
http://www.wfubmc.edu/biomed/ Medical Center Blvd
Tel 336.716.4493 Winston-Salem, NC 27157-1011
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