My IP address with DHCP

Gregory Nowak greg at
Sun Jan 11 21:29:58 EST 2004

Yeah, I have to agree with Steve here, there is no sense in a script asking
for the address of a dhcp server, I haven't seen a program that asks
for such a thing yet. When a dhcp client wants to contact a dhcp
server to obtain an ip address, it broadcasts a pac request on I
believe on udp port 67, and the dhcp server for the
network to which the client is connected responds. The address
reported as the inet addr for your network interface by ifconfig is
your address (the one the rest of the world contacts you by, and the
one you use when contacting the rest of the world).


On Sun, Jan 11, 2004 at 07:24:25PM -0700, Steve Holmes wrote:
> I didn't have to specify an IP address at all for my DHCP server at
> Cox.  "They" claim the modem does it or the "modem knows what to do."
> What I think happens is we broadcast network wide to request an IP and
> their DHCP responds.  My IP gets assigned and is seen under the addr
> field of ifconfig eth1.  On my box, eth0 is my local network and has
> an address of and my IP on eth1 is assigned from Cox and
> is currently something like 68.129.something.something:).  I can't
> emagine why a firewall script would be concerned about a DHCP server
> address unless it is trying to block sensative addresses or something.

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