[win2kforum] Re: Does ICS/Proxy reveal your internal MAC addresses to your ISP
- From: "Jason Flatt" <jasonflatt@xxxxxxxxxx>
- To: <win2kforum@xxxxxxxxxxxxx>
- Date: Wed, 9 May 2001 10:40:20 -0700
According to RFCs 1597 and 1918, the addresses in the 192.168.x.x range are
for private use only. From section 3 of 1597:
<-- Begin Snippet -->
The Internet Assigned Numbers Authority (IANA) has reserved the
following three blocks of the IP address space for private networks:
10.0.0.0 - 10.255.255.255
172.16.0.0 - 172.31.255.255
192.168.0.0 - 192.168.255.255
<-- End Snippet-->
This means that if you ping name.domain.com that is supposed to be somewhere
out in the ether, and you get 192.168.1.1, there is something wrong in your
internal network (specifically with whatever DNS server you are using). You
should NEVER receive a 192.168.x.x address when you are pinging a remote
named address (or 10.x.x.x or 172.?.x.x).
HTH,
Jason
----- Original Message -----
From: "The Ziggurat Builder" <mappy@xxxxxxxxxxxxxxxxxx>
To: <win2kforum@xxxxxxxxxxxxx>
Sent: Tuesday, May 08, 2001 10:14 PM
Subject: [win2kforum] Re: Does ICS/Proxy reveal your internal MAC addresses
to your ISP
>
> Actually, I work for tech support at a major cable modem company (I should
> say THE major cable modem company. Think Ted Turner) and we don't support
> routers or firewalls. If it was that company, then just know that they
> absolutely do NOT forbid routers, hubs, firewalls or linking multiple
> computers (go ahead, link 10 together- it won't slow down this behemoth of
a
> company), they just don't SUPPORT it. Big difference.
>
> The reason? It's simple: In tech support, we want to make sure that the
> cable modem works- that means that the unit works, the signal is clear,
and
> that the signal is coming in correctly. If all the above is OK, then it's
> not a hardware problem, and we move the qestion along to software support.
> Software support deals with soft conflicts that may interefere with cable
> modem service. If you have a router, and you call tech support, then what
> you're looking for is ROUTER support, something that they don't deal with.
> They want to make sure that the modem is working- any firewalls or routers
> you add are your own business and they don't want to deal with them. Call
> Cisco or the place where your router comes from, you know?
>
> Anyway, it's very easy to tell if you're using a router. If you are
> dynamically assigned an IP from a range, and someone at your ISP looks at
or
> pings your modem, they'll get back an IP address that reflects the DHCP
> range. Routers ALMOST ALWAYS come up as 192.xxx IP addresses (the IP that
> the router sends to the modem and computer). If you want to ghost it and
> configure the router so that it comes up as another IP address, go ahead.
> Use ipconfig to find your "direct" IP address, and then maybe add and
> configure your router to use a similar IP to connect to your modem or
> computer. Just realize, though, that when you call with a real connection
> problem, lie about not having a router (or firewall, etc), and ghost a
> real-looking IP address, the ONLY thing that they can do is to send a
> technician- nothing else will work. So you'll wait like 1-3 days for some
> geek to come out and say, "Take the router off!", see that it works
without
> the router, and leave.
>
> Hope that helps
>
> -Andy
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