[svlug] able to ping using IP but not able using hostname

[Prasad Paranjape]

Hi,
I am having Linksys Router WRT54GC and Comcast
Internet. 

Is there a way that I can make router cease from
changing IP assignment ?

Regards,

Prasad

--- Rick Moen <rick at linuxmafia.com> wrote:

> Quoting Prasad Paranjape (prasad_ishan at yahoo.com):
> 
> > Hello Gurus,
> 
> Hello yourself.  You had:
> 
> > In-Reply-To:
> <20061206232439.GE18077 at linuxmafia.com>
> 
> ...caused by your posting as a _reply_ to my post,
> making it appear to
> be part of the same thread.  Please, whenever you
> are starting a
> completely new topic, do so using a fresh non-reply
> posting, rather than
> misleadingly "replying" to a different thread.
> 
> 
> > 1) Linux Box 1 Is configured to obtain IP address
> from
> > DHCP running on Router.
> > 2)Linux Box 2 Is configured to obtain IP address
> from
> > DHCP running on Router.
> > 
> > The /etc/hosts files on both the machines I have
> entries for the other
> > host with fixed private IP addresses ( Though I am
> using DHCP to
> > obtain IP addresses).
> 
> This is part of your problem.  Obviously, the
> entries are going to end
> up being wrong.  Inherently, /etc/hosts is really
> useful only for IP
> address assignments that aren't subject to change.
> 
> > Now I am able to connect to Internet from both the
> hosts as router is
> > connected to cable modem.
> > 
> > I can ping to Box 2 from Box 2 using the IP
> address of the Box1 but
> > not using the hostname and same happens vice
> versa.
> > 
> > I know there should be something wrong with names
> resolving but know
> > very little and nothing about it.
> 
> OK, here's your problem:  The two hosts' IP
> addresses are subject to
> change, because the router assigns them dynamically.
>  You want to have
> consistently usable names for your hosts.  That goal
> requires that
> either you make the router cease changing the
> underlying IPs (assign
> them statically), or make the router publish DNS
> information for the two
> hosts that automatically follows their changing IP
> assignments.
> 
> So, you're not actually asking a Linux problem; the
> problem really has
> nothing to do with the two Linux boxes.  You need to
> control in some
> fashion what the router is doing, e.g., make it
> either publish dynamic 
> DNS information or keep the two hosts' IP addresses
> fixed in the future.
> 
> There's one exception (workaround):  In theory, you
> could leave the
> router alone, and configure your two Linux hosts to
> register their
> changing IPs with a dynamic DNS daemon that one of
> them runs -- and have
> the two Linux hosts get their name information from
> there.
> 
> Honestly, that workaround would be a whole lot of
> trouble, especially
> when you could make your life a whole lot simpler by
> just making the
> router's IP assignments static (or effectively
> static).  If your
> learning networking, for heaven's sake start with
> static IPs if humanly
> possible.
> 
> 
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> http://lists.svlug.org/lists/listinfo/svlug
> 



 
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