[olug] dhcpcd vs. dhclient

Jeff Hinrichs jlh at cox.net
Sat Mar 30 23:53:14 UTC 2002


This is very true.  The last IP address change I had with my linksys was
during the @home -> cox.net cut over.  dyndns.org is a nice way to put a
name to a potentially changing IP also.  I run a python script via cron that
checks my external IP on the linksys and updates dyndns as needed.  Very
smooth.

Considering that the linksys let's me boot BeOS, *nix and doze with out the
hassle it was well worth the 129 I paid for the 4 port model.  I've seen the
single port for $79 recently.  I've been considering upgrading to the
linksys vpn model.  Anyone else using it?

-Jeff

----- Original Message -----
From: "Phil Brutsche" <phil at giedi.obix.com>
To: <olug at olug.org>
Sent: Saturday, March 30, 2002 12:12 PM
Subject: Re: [olug] dhcpcd vs. dhclient


> A long time ago, in a galaxy far, far way, someone said...
>
> > I don't know if anyone else has had trouble with Cox changing your ip
> > address several times a day lately, but I think I've found an answer for
> > it. This is mostly referring to a Redhat 7.2 system.
> >
> > By default Redhat uses dhcpcd, which releases it's IP and requests a new
> > one when the lease expires.  This may be just coincidemce, but it looks
> > like Cox's dhcp server holds an IP for a while after it's been released
> > and you get a new one, instead of your old one.  For some reason dhcpcd
> > also gets the domain name screwed up too.  It should be "om.om.cox.net"
> > (according to reverse DNS lookups), but dhcpcd gets "om.cox.net".  Oh
> > well...
> >
> > I've tested with ISC's dhclient and it simply sends a renew request for
> > your current address when the lease expires.  This seems to behave much
> > better with Cox.
>
> This behavior isn't limited to dhcpcd - several firewall devices (like the
> Linksys "Cable modem/DSL router") do similar things in their DHCP clients.
>
> --
>
> Phil
>
>
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