RE: hostname and dhcp

From: Evan Dower (evantd_at_hotmail.com)
Date: 02/12/04

  • Next message: Nathan Kinkade: "Re: Crontab question" 
    To: Barbish3@adelphia.net, freebsd-questions-local@be-well.ilk.org
Date: Thu, 12 Feb 2004 14:55:49 -0800

    I guess I just won't worry about it then. It only prevents me from using
    send-pr (and in fact, I think I still wouldn't be able to use it because I'm
    pretty sure my smtp server requires me to log in), and every once in a while
    I have to change it in order for sshd, freenet6, and httpd to start. That
    part is very odd, actually. I had hostname="lojak.washington.edu" but
    recently things decided they didn't like that, so I changed it to
    hostname="lojak" and then it worked, but when I rebooted a few days later, I
    had to change it back. Then again, my system seems to have a number of
    unusual and inexplicable quirks.
    Thanks for all your help, (now if I could only get cdparanoia working
    again...) 

    --
Evan Dower
Undergraduate, Computer Science
University of Washington
Public key: http://students.washington.edu/evantd/pgp-pub-key.txt
Key fingerprint = D321 FA24 4BDA F82D 53A9  5B27 7D15 5A4F 033F 887D
>From: "JJB" <Barbish3@adelphia.net>
>Reply-To: <Barbish3@adelphia.net>
>To: "Evan Dower" 
><evantd@hotmail.com>,<freebsd-questions-local@be-well.ilk.org>
>CC: <freebsd-questions@freebsd.org>
>Subject: RE: hostname and dhcp
>Date: Thu, 12 Feb 2004 14:20:55 -0500
>
>If I understand you correctly, you are talking about your system
>which is connected to the public internet, and you are using the
>FBSD built in DHCP client to get an lease from your ISP. Now if you
>are an commercial user with an officially registered domain name and
>static ip address from your ISP,  Your ISP has you in their DHCP
>server with your FQDN and it's being sent to your system when you
>get an new lease. The FBSD built in DHCP client is not configured to
>accept that info which will auto populate the hostname= environment
>variable.  Install the DHCP package on you system and configure It's
>client to accept that info.
>
>If you are not an commercial user, then the host name the ISP uses
>for you is meaningless to you. If you have officially registered
>domain name then use that in your hostname=  statement, like this,
>hostname="cyberbaby.com", then that FQDN will be what sendmail uses
>for all the users on your LAN. Then use DHCP server to pass the
>major FQDN to all LAN PC, and those systems will append to the front
>their system names and tell your DHCP server their full name.
>
>If you do not have LAN or officially registered domain name, then
>all you need, is to meet the domain nameing convention,
>something.com and you are all set go. IE:
>hostname="home.FBSDyourLastName.com".
>
>As far as reverse lookup goes, that is only on officially registered
>domain names,  either yours, which really happens at the registry
>hosting your domain name, or at the ISP if your using their email
>servers.
>
>On your system the value you use in hostname=  should also be in the
>/etc/hosts file like this
>
>#
>::1			localhost localhost.my.domain
>127.0.0.1		localhost home.FBSDyourLastName.com FBSDyourLastName.com
>#
>
>
>Hope this helps
>
>Joe
>
>
>
>-----Original Message-----
>From: owner-freebsd-questions@freebsd.org
>[mailto:owner-freebsd-questions@freebsd.org]On Behalf Of Evan Dower
>Sent: Thursday, February 12, 2004 1:15 PM
>To: freebsd-questions-local@be-well.ilk.org
>Cc: freebsd-questions@freebsd.org
>Subject: Re: hostname and dhcp
>
>Hmm... That is what I expected it to do, but when I tried it, I
>ended up
>with an empty hostname. Of course, I don't remember now if I
>commented out
>that line or just set it to empty. Actually, looking at
>/etc/defaults/rc.conf I see that if I comment it out in /etc/rc.conf
>it gets
>set to the empty string in the default, so it shouldn't matter.
>Anyway, like
>I said, I tried that and just ended up with an empty hostname.
>Perhaps that
>indicates something is wrong with my configuration...
>Thanks very much for the help (any other ideas?),
>--
>Evan Dower
>Undergraduate, Computer Science
>University of Washington
>Public key: http://students.washington.edu/evantd/pgp-pub-key.txt
>Key fingerprint = D321 FA24 4BDA F82D 53A9  5B27 7D15 5A4F 033F 887D
>
>
>
>
> >From: Lowell Gilbert <freebsd-questions-local@be-well.ilk.org>
> >To: "Evan Dower" <evantd@hotmail.com>
> >CC: freebsd-questions@freebsd.org
> >Subject: Re: hostname and dhcp
> >Date: 12 Feb 2004 13:04:38 -0500
> >
> >"Evan Dower" <evantd@hotmail.com> writes:
> >
> > > I've actually been running FreeBSD for quite a while now, but
>I've
> > > never known exactly how to handle this. In rc.conf, one must
>specify a
> > > hostname. If you're using DHCP to set up your network though,
>your
> > > FQDN (fully qualified domain name) can change without notice. It
>seems
> > > like a Good Idea to have your hostname be your FQDN, since some
>things
> > > will do a reverse lookup on your IP to verify that it matches
>the
> > > hostname you supplied. In particular I'm thinking of SMTP
>servers
> > > here. (send-pr doesn't work for me because my mail gets
>rejected.) So,
> > > when you're autoconfiguring your network interfaces, what should
>you
> > > put in rc.conf's hostname variable? Is there something else I
>can do
> > > that would allow me to have something nicer looking, but still
>send my
> > > FQDN when asked?
> >
> >If you don't set your hostname in rc.conf, dhclient should change
>it
> >for you when it finds out what it is.
> >
> >--
> >Lowell Gilbert, embedded/networking software engineer, Boston area:
> >               resume/CV at
>http://be-well.ilk.org:8088/~lowell/resume/
> >               username/password "public"
>
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