sqwbwh wrote: > At 2010-11-05 23:13:19，"ShaoMiller"<shao.mil...@yrdsb.edu.on.ca> wrote: > > 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 > dhcp server is msdhcp > Use 1781.jpg and 1782.jpg is set. Enable use-cached did not succeed > Picture shows what can it? Those screen-shots show a DHCP option 178, not a DHCP gPXE encapsulated option 178.
You need DHCP option 175. _Inside_ option 175, you need to have gPXE encapsulated option 178. See: http://etherboot.org/wiki/msdhcp#setting_up_a_gpxe_encapsulated_options_on_windows_dhcp It shows exactly how to create the DHCP gPXE encapsulated options. 175 is a _container_. 178 ('use-cached') goes inside that container. Change to option 175 and you will be fine, since your bytes are exactly as I explained above: Option 178, 1 byte long, value 1. All gPXE encapsulated options go inside option 175. 0xB2 means 178. Please remember to carbon-copy the list using Reply-All. - Shao Miller
_______________________________________________ gPXE mailing list gPXE@etherboot.org http://etherboot.org/mailman/listinfo/gpxe
