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Posted by toby on July 4, 2005, 5:34 pm
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> I am relocating to Jackson County, North Carolina within a
> week or two. The local cable company in the area is Mediacom.
>
> I took my VOIP adapter (Voicepulse is the VOIP provider I am
> using) and connected it directly to the cablemodem. It got a DHCP
> address, which turned out to start with a 10 (yes, a private IP
> address). I asked the installer if that was normal. He told me that
> they normally provided addresses that start with 10 or 12 (but the 12
> is being treated by Mediacom as a private IP address as well).
>
> This presents some issues. The first is will my Cisco 831
> router work right with a private IP address on the Internet gateway?
> Will I need to change any settings? I understand that private IP
> addresses might be blocked through a NAT gateway (which is why I'm
> asking this question).
>
> The second is about telnetting into my Cisco router and
> targeting my Webserver. Is there any way to be sure that I can do
> this (I use a software utility called Dynamic DNS in conjunction with
> an online service called ZoneEdit to handle changes of my public IP
> address when the dynamic address changes)? Thus,
> http://www.myprivatedomain.com is targeted to the public gateway
> address on the router and NAT is used to forward the request to the
> Webserver on my home network. Bringing up http://10.100.101.102 from
> another location isn't going to work.
>
> Suggestions? Maybe there is someone here that uses Mediacom
> and has already solved these issues.
>
> I'm trying to find out if I can get a public IP address from
> Mediacom. If not, I may look into getting DSL instead.
>
>
> Fred
>
Hi Fred
It looks as if Mediacom will not let you use your setup as a server as there
is no way of routing traffic to a private address. They will be doing some
form of NAT possibly using the same Public IP address for several customers
on the cable feed.
This method seems pretty naff if you ask me so I would recomend moving to
that DSL you are talking about.
Just to answer another of your questions. There is no problem using NAT
between 2 different private IP address's the 831 does not itself know the
difference between public and private but this will not help i/c traffic to
a server on your home network. All it will enable you to do is link
multiple PC's for outgoing connections such as surfing, newsgroups, email
etc.
Regards
Toby
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