iptables questions

[Gregory Nowak]

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On Wed, Jul 12, 2006 at 07:46:34PM -0500, John Heim wrote:
> 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 know, my former ISP blocked outgoing smtp, and what's even worse is
that when they out-sourced their tech support, those people insisted
that they didn't block any ports. I also have a friend who has some
incoming ports blocked as well, so I'm familiar with the port blocking
problem, though I've never heard those situations described as
public or private ip addressing.

> 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.
> 

I agree totally. However, Tyler insisted on several occasions in private
messages that his ISP handed out 10.0.0/24 addresses to him, and I
repeatedly kept telling him that it was either his modem or router
that was doing that. As you said, for an ISP to be doing NAT for all
its customers would be more costly then having a pool of dynamic
public IPS to hand out.

Greg


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