[Ext] quistion about PXE boot

[Bob Harold]

On Sat, Apr 9, 2016 at 6:40 AM, Jim Glassford <jmglass at iup.edu> wrote:

> Hi Julie,
>
> Maybe related to dhcp snooping on layer two switch.
> If PXE server is different than dhcp server, snooping would block PXE
> boot. Would see this in the switch logs.
> If using HP ProCurve switch running older firmware, known problems with
> PXE booting with dhcp snooping enabled, upgrade or disable dhcp snooping.
> (not sure of versions with problems and nothing logged was when this
> happened)
>
> best!
> jim
>
>
> On Sat, 9 Apr 2016 00:21:43 +0000
>  Julie Xu <J.Xu at westernsydney.edu.au> wrote:
>
>> Hi,
>>
>> I have problem with one campus PXE boot.
>>
>> Basically, when you boot a window machine normally, it can get ip addres,
>> but if you do PXE boot, it can not get.
>>
>> This case happens when we change network switch. Yes, it is switch issue,
>> not dhcp.
>>
>> But, what is different PXE boot and normally boot different?
>>
>> On PXE boot, I can see the dhcp discover send out; I can see dhcp offer
>> send out from dhcp server. but, the dhcp offer never pass the switch to the
>> machine.
>>
>>
>> Any comments will be appreciated
>>
>> Thanks in advance
>>
>> Julie Xu
>>
>>
>
Try adding:
      always-broadcast true;
to that subnet.  Some combinations of routers and clients need that option,
but it increases the broadcast traffic, so I don't just use it everywhere.
 (For me, it is Juniper switches and Mac clients that hit this issue.)

-- 
Bob Harold
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