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Date: Tue, 18 Apr 95 13:41:38 EDT
From: jleppek@suw2k.ess.harris.com (James Leppek)
Message-Id: <9504181741.AA05651@borg.ess.harris.com>
To: freebsd-questions@FreeBSD.org
Subject: Re: PPP and dynamic IPs drifting a little
Sender: questions-owner@FreeBSD.org
Precedence: bulk

Speaking of IP's I was responding to this mail and recalled
the words of wisdom in the /etc/hosts file about selecting
private IPs from a set of reserved numbers that are never
to appear on the net and getting valid numbers if
you are on the net. It had mentioned 192.168.0.0-192.168.255.255
as reserved.

Well, I tried to ping those to confirm they are never in use and
I got an answer! Then I tried 192.168.1.2 and it answered!!

So what is the scoop on those numbers and RFC1597?

Jim Leppek

> From owner-freebsd-questions@freefall.cdrom.com Tue Apr 18 12:32:25 1995
> Date: Tue, 18 Apr 1995 12:13:52 -0400
> From: kelly@fsl.noaa.gov (Sean Kelly)
> To: kcw@grumpy.ksc.nasa.gov
> Cc: questions@FreeBSD.org
> Subject: Re: PPP and dynamic IPs
> Sender: questions-owner@FreeBSD.org
> 
> >>>>> "Ken" == Ken Whedbee <kcw@grumpy.ksc.nasa.gov> writes:
> 
>     Ken> I'm connecting to the internet (from FreeBSD2.0 patched)
>     Ken> through a dialup PPP (Internet Service Provider) account
>     Ken> which assigns an IP number dynamically.
> 
> Same here, although at work we're supposedly getting permanently
> assigned IP addresses for our home hosts ... waiting ... waiting ...
> 
>     Ken> My question is, do I have to setup anything in my /etc/hosts
>     Ken> and /etc/host.conf files or should my machine become aware of
>     Ken> its IP automagically ?
> 
> Nah, no need to do anything special.
> 
>     Ken> Do I need to specify my hostname in the /etc/hosts file ?
> 
> Pick any host name and IP address you want.
> 
>     Ken> What order should DNS lookup and /etc/hosts lookup be in the
>     Ken> /etc/host.conf file ?
> 
> I think any order will work; but I use /etc/hosts first for when I'm
> not connected to my service provider.
> 
>     Ken> I was tring to talk to the ISP's nntp server (telnet to the
>     Ken> port number) and it was saying "host not in nntp access file
>     Ken> .. error code 502".  The ISP claims their floating IPs are in
>     Ken> the nntp access file.
> 
> They're lying.
> 
>     Ken> If I ping myself it shows the dynamically assigned IP.
> 
> Good.
> 
>     Ken> Any insights ?
> 
> I haven't had a good insight in years.
> 
> --
> Sean Kelly
> NOAA Forecast Systems Lab, Boulder Colorado USA
> 
> If they ever come up with a swashbuckling school, I think one of the
> courses should be Laughing, Then Jumping Off Something.
> -- Jack Handey
>