[syslinux] KEEPPXE/DOS

[Jonathan Hurd]

Err after reading up on the options the syslinux command line would be

Menu Ghost
KERNEL memdisk
APPEND initrd=MSDOS.IMG
IPAPPEND 1


and the ouput if quered would be: ip=<client-ip>:<boot-server-ip>:<gw-ip>:<netmask> ??

how could I query that information in PCDOS7, sorry if this is out of the scope of this group.



----- Original Message ----
From: Jonathan Hurd <texasjhurd at yahoo.com>
To: For discussion of SYSLINUX and tftp-hpa <syslinux at zytor.com>
Sent: Monday, December 17, 2007 8:56:09 AM
Subject: Re: [syslinux] KEEPPXE/DOS


Thanks HPA, this is where I was getting at...
 
First am I going in the right direction? I can only get an IP in two ways for the client to boot up a samba share. One, if I somehow grab the IP from pxe process through a memdisk query.Two, if I make a second DHCP request. Option two according to security standards will only work if I can provide some sort of DHCP identifer for those clients. Being that this is DOS, I dont think there is any single identifer to point it out from anything else (correct me if I'm wrong, and I could not find anything in the DHCP packets for dhcpd.conf to work with).
 
So that really only leaves me with option 1. Can you explain how I would do a memdisk query to retrieve the IP (if possible with /dos), Subnet Mask, and GW from the pxeprocess. Your also telling me that there is no reason use the keeppxe line, that is only to keep the undi driver around. Instead I would use "ipappend 1"??
 
Like this?
MENU Ghost
KERNEL memdisk
APPEND ipappend1 initrd=MSDOS.IMG
 
Thanks


----- Original Message ----
From: H. Peter Anvin <hpa at zytor.com>
To: For discussion of SYSLINUX and tftp-hpa <syslinux at zytor.com>
Sent: Friday, December 14, 2007 4:12:33 PM
Subject: Re: [syslinux] KEEPPXE/DOS

Jonathan Hurd wrote:
> First off I love syslinux and it has worked flawless for us on the unix side of the realm.
> 
> 
> We're trying to use our ghost images within a dos netboot using syslinux. Unfortunatly we can only pass DHCP ip's to hosts that exhibit a vendor code 'like windows/pxe/and other os's do". Unfortunatly DOS does not, so we cannot request a second IP after the pxe process to map samba shares. From what I've read you can use the 'keeppxe' line and call the orrignal ip information recieved durning the pxe boot process? Is that correct, and if so how would I do that. 
> 
> 
> If that is not the case and I can keep around universal pxe stack to load dhcp again so that it exhibts a vendor code, how could I do that?
> 
> Basicaly I need a way to map a samba share after the netboot, and I would need an ip address on the network to do that. This would be an automated process so I cant just enter a static... has to be a dhcp enabled one, or one handed from the pxe process...

Ultimately this is a question about the DOS networking stack you're 
using, not about SYSLINUX, which makes it difficult to answer.

With the "keeppxe" option, syslinux will keep the PXE stack loaded (it 
eats up a LOT of low memory, however.)  If you're using MEMDISK, an 
alternative is to specify "ipappend 1" and then use the MEMDISK query 
API to get the ip= line from the memdisk saved command line.

The keeppxe option has the advantage that you can use an UNDI driver in 
DOS, which means your networking is hardware-independent... as long as 
you're willing to lose 64-128K of DOS memory.

    -hpa

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