dhcp issue

[Tod Merley]

On 9/2/06, Gbenga Shobowale <gshobowale at gmail.com> wrote:
> Hi all,
> I just upgrade to FC5 before then I had 2 NIC in one with static IP
> and other on DHCP, however after the upgrade my machine can't seem to
> up up an IP from the modem...I Check the card its configured properly
> and the one with a static IP works fine...I put the link on a windows
> machine and it work..hence I think FC is having a problem with
> DHCP..any ideas anyone?
>
> Thanks
>
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Hi Gbenga Shobowale!

My first thought is that your DHCP client is not looking at the eth1
interface.  It shows a few packets recieved apparently less than half
responded to.  Probably being queried by the server but with no DHCP
client looking not responded to.

Here is how to look arround a bit - -

At the moment (I am working on it right now) I do not have an FC5 box
in the house so perhaps the way I found where some things are will be
of help:

As root do an "updatedb".  This may take some time, all files are
being catalogued.

Then look for 'dhclient.conf":

tod at tod-desktop:/var/lib/dhcp3$ locate dhclient.conf
/etc/dhcp3/dhclient.conf
/usr/share/man/ja/man5/dhclient.conf.5.gz
/usr/share/man/man5/dhclient.conf.5.gz
tod at tod-desktop:/var/lib/dhcp3$

Note the man page available for dhclient.conf!!

Now lets find the leases:

tod at tod-desktop:/etc/dhcp3$ locate leases
/var/lib/dhcp3/dhclient.leases
/var/lib/dhcp3/dhclient.eth1.leases
/var/lib/dhcp3/dhclient.eth2.leases
/var/lib/dhcp3/dhclient.ath0.leases
/var/lib/dhcp3/dhclient.wlan0.leases
/var/lib/dhcp3/dhclient.eth0.leases
/usr/share/doc/imagemagick/www/binary-releases.html
/usr/share/man/ja/man5/dhclient.leases.5.gz
/usr/share/man/man5/dhclient.leases.5.gz
tod at tod-desktop:/etc/dhcp3$ /var/lib/dhcp3/

Running "cat" (print to screen) on all of the above showed them blank
(due to a nasty IPv6-dns problem I run static).  So for you I used
Ubuntu's System > Administration > Networking tool to set eth0 to use
DHCP.  I also used "sudo vi /etc/resolv.conf" (sudo obtains root
priviledges for what comes after) to edit out my local DSL modem's
nameserver (the IPv6 thing).

Now a differant result (note: X's in the IP's for privacy):

tod at tod-desktop:/var/lib/dhcp3$ cat dhclient.leases
lease {
  interface "eth0";
  fixed-address 192.168.X.X;
  option subnet-mask 255.255.255.0;
  option routers 192.168.X.X;
  option dhcp-lease-time 86400;
  option dhcp-message-type 5;
  option domain-name-servers 192.168.X.X,205.171.3.65;
  option dhcp-server-identifier 192.168.X.X;
  option domain-name "domain.actdsltmp";
  renew 0 2006/9/3 05:30:41;
  rebind 0 2006/9/3 14:48:15;
  expire 0 2006/9/3 17:48:15;
}
tod at tod-desktop:/var/lib/dhcp3$

Well, that will probably get you started.

Good Hunting!

Tod