Re: pi3 reverse DNS

[jproy@world.std.com (John P Roy)]

> 
> Is the reverse DNS purpose to merely store the name into a variable, or is
^^^^
People use reverse DNS for thier logfiles, because its a lot better
to know that www.microsoft.com is looking at you website than
207.68.137.65

> it to block access from people without a DNS entry?  I'm asking because
^^^^
Some people restrict access by browser IP, this is a security flaw
because dedicated hackers can 'spoof' thier own IP and gain access to
restricted information.

> when I enable reverse DNS and access pi3 (1.0) from an address w/o a DNS
> entry, the web browser times out waiting for data.  Is there a way to limit
^^^
This is windows 95?, it doesn't happen under unix and is not meant to
happen under windows, I don't know the specifics of what MS is doing
with the TCP stack these days but the sockets service

	>gethostbyaddr()<

is meant to return a hostname given an IP or fail, on failure Pi3Web
uses the IP in place of the hostname and happily continues, it
seems the problem is where the OS just takes a whole lot of time to
decide it doesn't have the IP. 

> the number ms to wait looking for a DNS entry, or what?
^^^
I'm not sure of the options for fine tuning the OS and beyond that
the network DNS services in terms of the latest MS stuff. 

There may be options to set a timeout to gethostbyaddr() within Pi3Web,
I'd like to look into how other Internet servers handle this issue.

John
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