DHCP and rc Questions For FreeBSD 4.10???

Thu Aug 12 10:03:32 PDT 2004

Hi Bill,

>What is the output of "ipfw show"?

I dont know that command? Syntax???

#########################

root at redgate% ipfw show

#########################

is that correct?

>You may do better to set:
>firewall_enable="YES"
>firewall_type="OPEN"

Ok I will...

I wrote to Earthlink and this is what they had to say:

>Earthlink: I suggest you reset the cable modem and then 
>try connecting to the net.

>Earthlink:In order to fix this your cable modem needs to 
>be reset. First shut down your computer and then disconnect 
>the power from the cable modem for 1 to 3 minutes. This will 
>reset the modem. Next, reconnect the power to the cable modem 
>and turn on your computer. If this does not resolve the issue, 
>please let us know so we can dig a little deeper.

What do you think of this???

-----Original Message-----
From: Bill Moran <wmoran at potentialtech.com>
Sent: Aug 12, 2004 12:29 PM
To: "Hakim Z. Singhji" <hakim.singhji at earthlink.net>
Cc: freebsd-questions at freebsd.org
Subject: Re: DHCP and rc Questions For FreeBSD 4.10???

"Hakim Z. Singhji" <hakim.singhji at earthlink.net> wrote:
> >Who manages your DHCP server?  The config I described has worked in
> >every configuration I've ever dealt with (and that's quite a few) so
> >there is definately something external causing the problem.
> 
> I have an Earthlink Highspeed Cable account w/ DHCP Server
> 
> >Did you install a packet filter when you set this box up?  
> 
> Yes, however I turned firewall to [firewall_enable="NO"] and commented
> all firewall entries in the rc.conf file.

What is the output of "ipfw show"?

You may do better to set:
firewall_enable="YES"
firewall_type="OPEN"

> >If you don't have a DHCP _server_ on your network, then the DHCP _client_
> >will not be able to to its job.
> 
> Earthlink should provide a DHCP server, when I had my standalone redhat 
> box it was configured and I was also receiving DNS as well through earthlink.
> 
> 
> What do you suggest I do?
> 
> -----Original Message-----
> From: Bill Moran <wmoran at potentialtech.com>
> Sent: Aug 12, 2004 11:45 AM
> To: "Hakim Z. Singhji" <hakim.singhji at earthlink.net>
> Cc: freebsd-questions at freebsd.org
> Subject: Re: DHCP and rc Questions For FreeBSD 4.10???
> 
> "Hakim Z. Singhji" <hakim.singhji at earthlink.net> wrote:
> > Bill & FreeBSD-Questions,
> > 
> > This configuration is not as intuitive as I thought it would be. 
> > In /etc/rc.conf I added the following strings:
> > 
> > ############################
> > network_interfaces="lo0 dc0"
> > ifconfig_dc0="DHCP"
> > ############################
> > 
> > "Then I deleted the entries in dhclient.conf and relied on the
> > default. I started the daemon by [dhclient dc0] and it 
> > seemed to be processing.  However, that was all that 
> > happened. When I [ifconfig dc0] I get this return:"
> > 
> > #############################
> > root at redgate% ifconfig dc0
> > dc0 flags = 8843<UP, BROADCAST, RUNNING, SIMPLEX,
> > MULTICAST> MTU 1500
> > inet6 fe:80::2c0:f0ff:fe79:4ab7%dc0 prefixlen 64 scopeid 0x1
> > inet 0.0.0.0 net mask 0xff000000 broadcast 255.255.255.255
> > ether 00:01:02:c3:40:1a
> > media Ethernet auto select (100base<full duplex>)
> > status: active
> > ###############################
> > 
> > "Then I tried to ping a host..."
> 
> You've gone too far ... there's not use trying to ping anything if you
> obviously didn't get a DHCP address.
> 
> Who manages your DHCP server?  The config I described has worked in
> every configuration I've ever dealt with (and that's quite a few) so
> there is definately something external causing the problem.
> 
> Did you install a packet filter when you set this box up?  Look through
> /etc/rc.conf for anything related to "firewall".  Turn off all firewall
> rules while you're setting things up.  Once it works, you can start
> turning security stuff like that back on.
> 
> > I was reading Greg Lehey's book "The Complete 
> > FreeBSD" which happens to have more information on
> > DHCP,DNS, BIND than "Absolute BSD" by Michael Lucas and 
> > Greg says that in order for dhcp to work you must start dhcpd,
> > am I reading this correctly. I assumed that dhcpd would provide 
> > DHCP for the private network (in my case), I did not think that
> > my default gateway would rely on dhcpd in order to function.
> 
> DHCP only works if there is a DHCP server.  DO NOT run more than 1
> DHPC server on a single network or everything is likely to go to hell.
> 
> Most cheesy "internet routers" that people buy include a DHCP server.
> 
> If you provide more information about what your network setup is, we
> can tell you whether you need a DHCP server or not.  But the simple
> answer is: DHCP won't work unless there is a DHCP server somewhere.
> 
> > Now I have 2 questions:
> > *must I configure dhcpd now?
> 
> Maybe not.  Does the network you're plugging in to require DHCP?
> 
> > *must I configure dns (resolv.conf, named, etc.)?
> 
> No.  If you don't mind using IP addresses for everything.  If you want
> to be able to use hostnames (such as www.yahoo.com) then you need DNS.
> 
> > *does DHCP rely on the two configurations list above to data?
> 
> Huh?
> 
> The two lines I provided are enough to configure FreeBSD to be a DHCP
> _client_.  Any additional configuration is just tweaking its behaviour
> and and is almost never required.
> 
> If you don't have a DHCP _server_ on your network, then the DHCP _client_
> will not be able to to its job.
> 
> If you have a very small network (how many computers are here anyway?)
> a DHCP server is probably more work than it's worth.
> 
> If you are plugged into a larger network (such a the Internet through an
> ISP) then either a) your ISP's DHCP isn't working right or b) your ISP
> isn't using DHCP or c) your ISP is doing something to enforce security,
> such as registering MAC addresses, and you aren't registered correctly
> or d) something bizaar that I've never seen before.
> 
> Again, if you could provide some information on how you're trying to set
> things up, we could provide less general answers.
> 
> -- 
> Bill Moran
> Potential Technologies
> http://www.potentialtech.com
> 
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-- 
Bill Moran
Potential Technologies
http://www.potentialtech.com