sqwbwh wrote: > At 2010-11-05 22:39:05，"ShaoMiller"<shao.mil...@yrdsb.edu.on.ca> wrote: > >>>>> sqwbwh wrote: >>>>>> >>>>>> >>>>>> How to modify the code can not get DHCP information on the >>>>>> 2nd?(GPXE only used to boot the system from ISCSI) >>>>>> Is to remove this step. >>>>>> net0: 00:0 c:: 29:08:11:35 on UNDI-PCI02: 01.0 (OPEN) >>>>>> [Link: up, TX: 0 TXE: 0 TX: 0 rxe: 0] >>>>>> DHCP (net0 00:0 c: 29:08:11: d5 ).... ok >>>>>> net0: 192.168.0.202/255.255.255.0 >>>>>> >>>>>> >>>>>> This can speed up boot speed. >>>>>> Normal GPXE run to start from the boot system tftp process >>>>>> takes about 8 seconds or so >>>>>> If removed from the second time for DHCP information will >>>>>> only need a very quick 2.5 seconds. >>>>>> >>>> Miller, Shao wrote: >>>>> You most likely want the 'use-cached' option. It is DHCP gPXE >>>>> encapsulated option number 178. Or, you can set it in an embedded script: >>>>> >>>>> #!gpxe >>>>> set use-cached 1 >>>>> autoboot >>>> Gene Cumm wrote: >>>>> >>>>> What file and version are you using? It sounds as if you're using >>>>> undionly.kpxe or a .pxe file. undionly.kkpxe will skip this second >>>>> DHCP request but certain hardware/firmware has issues with this, >>>>> assuming you trust the stability of your OEM's PXE/UNDI stack. >>>>> >>> sqwbwh wrote: >>>> Shao Miller >>>> >>>> The method is successful. >>>> Thank you >>> sqwbwh wrote: >>>> yes >>>> thankyou Shao Miller >>>> Your method is useful ：） >> Miller, Shao wrote: >>> You’re quite welcome, and thanks for including the list on your >>> other reply. :) Have a nice day. - Shao >> > sqwbwh wrote: >> Shao Miller >> 1: >> i use : >> " set it in an embedded script: >>> >>> #!gpxe >>> set use-cached 1 >>> autoboot >> it's good >> 2: >> "It is DHCP gPXE encapsulated option number 178" >> Specifically to ask how to use this method? >> What can explain it in detail? >> thank~you > I enjoy using the search feature at the gPXE (Etherboot) wiki. > Please see: > > > http://etherboot.org/wiki/doku.php?do=search&id=encapsulated&fulltext=Search > http://etherboot.org/wiki/msdhcp > http://etherboot.org/wiki/dhcpd > > ShaoMiller > Use the search function. > Use hyperlinks to provide you with three options for the introduction > of 178 not found. > 178 keyword search does not find use-cached search did not find the > relevant presentation. > > Hehe. Could you give me the answer it?. English is almost a maze for me >
I'm afraid that I'm not sure how to explain gPXE encapsulated options any better than they are explained in the wiki. DHCP option 175 should be a string of bytes. Within that byte sequence, there are sub-options. 'use-cached' is sub-option 178. So your DHCP option 175 could look like: 0xB2 0x01 0x01 where, 0xB2 : DHCP gPXE encapsulated option 178. 0x01 : The encapsulated option's value occupies 1 byte. 0x01 : The encapsulated option's value is 1 (true). I do not know which DHCP service you use, so I do not know how you can reconfigure your service to give PXE clients this 'use-cached' option via DHCP. - Shao Miller
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