[PLUG] Can't ping under Ubuntu Intrepid

[Tim Wescott]

Tony Rick wrote:
> On Tue, Apr 28, 2009 at 2:41 PM, Tim Wescott <tim at wescottdesign.com> wrote:
>
>   
>>> More cluelessness...
>>>       
>>     
>
> My 2 cents, use of 'ssh' notwithstanding:
>
> There are some questions not answered here.
> 1.  How does one choose the addresses for fixed IP Address assignment in a
>      home network?
> 2.  What is the fully qualified domain name of machines behind a router
>      in a home network?
> 3.  If the router isn't a nameserver, what do I use as a nameserver address?
>
> I offer some simple answers from the universe of possibles.
>
> 1. The default Local Area Network (LAN) IP address range of a WRT54G
>      is 192.168.1.1/255, according to the WRT54G User Guide.  Address
>      192.168.1.1 is the default LAN address of the router itself.  All other
>      addresses in that range are eligible to be assigned as fixed....BUT...
>
>      If the router is configured to provide addresses via DHCP, (which I
> assume
>      yours to be, bein' as how it has apparently been happily providing
>      addresses all along) the default range of DHCP addresses under its
> control
>      starts at 192.168.1.100.  That means that, for sanity's sake, the range
> of
>      eligible fixed addresses is 192.168.1.2/99.   That should be more than
> enough
>      for a home network.
>
>      This approach is predicated on the assumption that the router is in a
> more
>      or less default state.   To verify this, you're gonna hafta put on an
> admin
>      hat and try to talk to the web interface of the router.  Simply enter
> the URL
>      192.168.1.1 into a browser.   If you get prompted for an admin name and
>      password, chances are the default configuration holds (not necessarily
>      a good thing).  I you don't get the prompt, you could try 192.168.0.1,
> or
>      10.0.0.1.   If you want to pursue this track, get a WRT54G UserGuide
>      (google, download, free, try
>         http://www.linksysbycisco.com/US/en/support/WRT54G/download
>      )
>      and 'Read More About It'.
>
>      So this gives you a set of choices for fixed IP addresses.  What about
>      FQDNs (do not pronounce this phonetically in a room full of kids, else
>      be prepared to suffer 'humiliations galore'), acronym for Fully
> Qualified
>      Domain Names).   On to...
>
> 2.  If you have purchased/registered your own domain name, you are home
>      free: use that.   If not, make one up.  Since your machines are behind
>      a firewall, it shouldn't matter, but discretion is in order.  I use
> '.local',
>      which was suggested by some site when I was first figuring this stuff
>      out.
>
>      Now there's enough to populate a /etc/hosts file (using yours as a
> template):
>
>         127.0.0.1        localhost.local localhost
>         192.168.1.2    thishere.local   thishere
>         192.168.1.3    thatthere.local thatthere
>
>         # The following lines are desirable for IPv6 capable hosts
>         ::1     ip6-localhost ip6-loopback
>         fe00::0 ip6-localnet
>         ff00::0 ip6-mcastprefix
>         ff02::1 ip6-allnodes
>         ff02::2 ip6-allrouters
>         ff02::3 ip6-allhosts
>
>    So what about resolv.conf and the nameservers...
>
> 3.  Your ISP has nameservers for you.  They should be already programmed
>      into your modem, and possibly even automatically set up in your router,
>      as evidenced by the fact that you can ping named hosts in the great
>      world ('out among them English').
>      Rich's example uses his local nameserver IP address (192.168.55.1), and
>
>      several from aracnet, which I assume to be his ISP.  You should have
>      yours around somewhere in some information from your ISP, or they
>      might even be in the help section of your ISP's web site, if they are
> worth
>      their salt.  The 'domain' line in resolve.conf I have found to not be
> necessary
>      for my simple home use.
>
> For this to effective for your network, all machines that you want to assign
> fixed addresses to need to have /etc/hosts and /etc/resolve.conf files
> modified
> with the same information.
>
> (a bit wordy for 'simple answers').
>
> - tony
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>
>   
Thanks Tony.  Some of that I already knew, but you tied it together well 
and filled in some vital bits.

-- 
Tim Wescott
Wescott Design Services
Voice: 503-631-7815
Cell:  503-349-8432
http://www.wescottdesign.com