iptables questions

[John Heim]

When the tech support guys at Tyler's ISP told him he had a "private" 
IP, they probably meant they're blocking incoming connections.  He had 
to pay $5 extra to get them to punch a hole in their firewall.  Lots of 
ISPs block some ports so you can't set up your own smtp server, for 
example.  Maybe Tyler's ISP blocks all incoming connections by default 
and allows only outgoing and existing connections.

I can't believe an ISP would hand out 10.0.0/24 addresses. Hand out 
private IP addresses and do NAT for every customer? Impossible (I 
think). It may even be illegal.

More likely, they have a range of IP addresses that are not blocked by 
their firewall. They had to reassign him one from that range. That's 
what cost $5. I think "private" is marketing-speak for "blocked".

Gregory Nowak wrote:
>

+

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> On Wed, Jul 12, 2006 at 12:20:19PM -0600, Tyler Littlefield wrote:
>>     Um... I called the ISP, and had to go up to the manager, because no one
>> else woudl tell me what was going on. It turned out that it **wasn't** the
>> modem/router, but I had a private IP. I ended up paying $5 extra a month for
>> a public.
> 
> Ok, but that's one heck of a rip off if you ask me. A decent ISP will
> give you a dynamic publicly accessible IP for free, and charge you
> extra for your own public static address. For an ISP to be doing NAT
> on it's network for it's customers, and be charging to give them a
> public IP which I'm guessing is still dynamic, is a rip off.
> 
> Anyway, you have 3 machines you said with internet
> connections. However, you still have one public IP address, unless you
> purchased a block of static addresses. So, my point still stands, your
> modem or router is still doing IP masquerading for you, and assigning
> an internal IP to each of your 3 machines.
> 
> Greg
> 
> 
> 
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