[K12OSN] option-128 and option-129 in dhcpd.conf

Rob Owens robowens at myway.com
Thu Feb 10 16:08:21 UTC 2005

So it sounds like if I'm using pci ethernet cards, then these 2 lines aren't needed.  But is it possible that they would mess anything up if I leave them uncommented?


 --- On Thu 02/10, Jim McQuillan < jam at McQuil.com > wrote:
From: Jim McQuillan [mailto: jam at McQuil.com]
To: robowens at myway.com, k12osn at redhat.com
Date: Thu, 10 Feb 2005 11:02:26 -0500 (EST)
Subject: Re: [K12OSN] option-128 and option-129 in dhcpd.conf

Rob,<br><br>option-129 is used to pass command-line arguments to the kernel during<br>the boot process.  This is ONLY when using Etherboot to load the kernel.<br><br>And, Etherboot will ignore option-129, unless option-128 contains the<br>special value of 'e4:45:74:68:00:00'.<br><br>Most of the time, you don't need to pass any special arguments to the<br>kernel.  But, if you have an ISA network adapter, you'll need to tell<br>the kernel about it, so that the proper driver module can be loaded.<br>So, you'll see things like:<br><br>    option option-128   e4:45:74:68:00:00;<br>    option option-129   "NIC=ne IO=0x300";<br><br>That will inform the kernel that you want to load the ne2000 network<br>driver module, and the IO address is 0x300.<br><br>Some cards, like the 3com 3c509 don't require the IO parameter.<br><br>Again, the above parameters are only used for Etherboot, and it really<br>doesn't matter whether you are booting from an etherboot floppy or an<br>etherboot bootr!
om.<br><br>For PCI network cards, we don't need to pass these parameters, because<br>the kernel+initrd can scan the PCI bus and discover the PCI card, and<br>then it does a lookup in a table, to see which module to load.<br><br>That's why I consider a minimum LTSP thin client to be anything with a<br>PCI bus.  It's just so much easier than dealing with old ISA stuff.<br><br>Jim McQuillan<br>jam at Ltsp.org<br><br><br><br>On Thu, 10 Feb 2005, Rob Owens wrote:<br><br>><br>> What do these 2 lines do?  I've seen write-ups that say to comment them out if you're booting from a floppy, but I'd like to know what their purpose is.<br>><br>> Thanks<br>><br>> -Rob<br>><br>> _______________________________________________<br>> No banners. No pop-ups. No kidding.<br>> Make My Way your home on the Web - http://www.myway.com<br>><br>> _______________________________________________<br>> K12OSN mailing list<br>> K12OSN at redhat.com<br>> https://www.redhat.com/mailman/listinfo/k12osn<br>> For mor!
e info see <http://www.k12os.org><br>><br>

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