Re: ADSL/CABLE Internet connection question,PLEASE!
From: Courtney (a_at_b.c)
Date: 06/29/04
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Date: Tue, 29 Jun 2004 12:34:28 -0500
Alon Brodski wrote:
> Hello world!
>
> I have Windows XP Pro.
>
> I wonder if I could configure ONE computer to be connected to the Internet
> both using ADSL and CABLE.
> Of course,not simultanously.Just to have 2 Dial Up Connections (not
> analog,but PPP virtual ones) and use them one after another.
> ONE-PPTP (VPN) for Cable modem connection and SECOND-,say,PPPoATM for USB
> ADSL modem connection.
> I have a NIC and my cable modem is connected to it.It's LAN and I have
> 172.2X.X.X IP address from cable Co. at all times and when I want to connect
> to the Internet I Dial to my ISP and get an external IP address from
> it-80.179.X.X in my case...(each time it's different,naturally)-Open Access
> type.
> I have USB port and I can get a USB ADSL modem and use a PPPoA type of
> connection with it.
> And to use the same ISP (whether with the same or not account with it-it
> doesn't matter here)...
>
> The way I understand it-it should work OK...The unclear part is.....is it
> the NIC or the modem that gets 172.X.X.X address? In Cable....Some ppl don't
> have NIC's in their PC's...they use USB Cable modems...but they would still
> have that 172.X.X.X address...so it's not the NIC,but the modem who gets
> it....or am I wrong?
>
> If I also have a USB ADSL modem,then that modem would get a 10.X.X.X IP
> address from TELCO at all times
>
>
> So the bottom line is....the way I get it....my Cable modem would constantly
> have that 172.X.X.X address from Cable Co ( same as my NIC).AND my ADSL
> modem would constantly have 10.X.X.X address from TELCO.
> Whenever I use a Dial Up PPTP VPN adapter it would get a 80.179.X.X address
> from my ISP and I would get on the Internet using cable infrustructure.Then
> I disconnect...Then I'll use a PPoA connection (the virtual adapter is
> installed ,using a software that comes with the ADSL modem-Globespan ALE
> series...) and I would get also 80.179.X.X address from ISP,using my another
> account with it (the ADSL one).
>
>
Your request is kind of confusing...so here is my attmept at explaining
what I think is going on.
Cable: Regardless of how you connect, the cable modem itself never gets
an IP address. The modem itself does not support the IP protocol. The
first NIC it encounters, however, does get the IP address--whether it's
an actual NIC or an XP-emulated one (via USB interface). The NIC,
whatever type it is, will show up under Network Connections.
DSL: In this case, the IP address is assigned at the head end, before it
ever reaches your computer or your DSL modem. Like cable, if you connect
via USB, the connection will again appear in Network Connections.
Dial-Up: This works the same way as DSL; the IP address is assigned when
you dial up, not at your end, but at the router you dial into. Once
again, the modem will appear in Network Connections.
Now you can have any one, or all three network connections going at the
same time. You can also bridge any two (or all three) connections.
(Highly not recommended on a commercial network.)
Now, will you get an increase in network bandwidth by having multiple
connections going? Nope. Remember that the distant end server will
respond to the IP address that made the request, not all three, despite
all the websites that have you making registry changes to do this.
By the way, the following IP addresses are not routable over the
Internet and are dropped by the first router they encounter:
10.0.0.0 - 10.255.255.255 (10/8 prefix)
172.16.0.0 - 172.31.255.255 (172.16/12 prefix)
192.168.0.0 - 192.168.255.255 (192.168/16 prefix)
So, your 10.x.x.x and 172.x.x.x are not the IP addresses your service
providers use to allow you to access the Internet. These are most likely
NAT'd addresses.
courtney sends....
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