Re: DHCP

[Mij <mijio@mac.com>]

Two things to be considered:

1) pump, dhclient and other user-space tools ages simply as client: they
use the network interface
to request for an ip and sets through syscalls the interfaces. This is a
process, has a priority and
could work in background

2) network/interfaces and ifup/down requests kernel-level ability to do this
work itself. If you
have a cable connection, probably you like to request the interface to be
set up at bootstrap.
If you sets eth0 interface to be pick up at boot time, this time the kernel
stops and search for
a dhcp answer, blocking the system.

Finally, this means that a user-space client permits you (if you set rc.x/SnnPickUpEth0
) to work
while eth0 get up, while ifup eth0 does not.
If appens that your machine can be disconnected from the network, your bootstrap
will require
a long long time, waiting for dhcp request time out. If it's alway connected,
instead, this method
could be more handy.

Take care of this and take your decision.

bye

Albert D. Cahalan wrote:
> Michel D\344nzer writes:
> > On Thu, 2002-07-04 at 00:14, Albert D. Cahalan wrote:
> >     
>
> > > Does it work? I've tried every daemon that
> > > looked like a client: dhcpcd, pump, dhclient...
> > > This is with debian-testing, ppc, and a 2.4.16 kernel.
> > > I even know the interface works.
> > >         
> > pump's been working fine for me. Have you read interfaces(5)?
> > Do you use ifup/ifdown?
> >         
>
> Reading interfaces(5) was certainly interesting.
> It helps explain why an insmod for my network
> hardware will configure a static address for me.
> It also says I can't use pump with a 2.4.xx kernel.
>
> So pump isn't likely to work.
>
> I wasn't planning to use ifup/ifdown at all. I have
> a script to load modules, change the hardware address
> to satisfy my cable modem, add firewall rules, and
> so on. On my x86 box, the part of that script which
> interacts with the DHCP client looks like this:
>
> ##################################################################
> # don't get an IP until firewall is up
> if ps -C dhcpcd ; then echo DHCP client running ; else dhcpcd ; fi
> . /etc/dhcpc/dhcpcd-eth0.info
>
> iptables -A INPUT -i eth0 -d ! $IPADDR -j DROP # not for us
> ##################################################################
>
> None of pump, dhclient, or dhcpcd are even able to
> get an IP address on my
>  Mac.
>
>
>