[gPXE] is it bug or feature for gPXE?

[Andrew Bobulsky]

Hello Oleg,

I can't say with any certainty what your problem is, but I have
personally had to deal with DHCP problems that were impossible to
solve without doing some packet capture.

For the benefit of those who will likely read your email in the
morning, my only suggestion is that you load up Wireshark and capture
the traffic occurring during the test scenario you're describing.

I've found that the cause of funny DHCP client behavior is usually
easy to pinpoint, even if it's not easy to fix.

Cheers,
Andrew Bobulsky

On Nov 11, 2010, at 2:32 AM, oleg-gumenyuk <oleg-gumenyuk at yandex.ru> wrote:

> Hello ALL!
>
> Historically our customer has got network where 2 DHCP servers are up and running for redundancy purpose. DHCPD config file is common for both servers. No issues if we boot down the wire WinPE, any Linux. We observe issue when gPXE is booted.
> When gPXE requests IP address both DHCP servers send responces. The concequence of such behaviour is that gPXE lost network settings. We have localized problem to the following small scenario:
>
> 1. boot to gPXE 1.0.1 on host A and enter to the interactive mode (Ctrl-B).
> 2. from another host B start pinging IP address which will be assigned to the host A
> 3. execute on Host A gPXE command: dhcp net0
> 4. ping from host B are successful.
> ...waiting a little bit about 5-7 secs ....
> Host A is not pingable.
>
> If we stop one of DHCP server such issue is eliminated.
>
> Question: is it a bug of gPXE? _or_ Is it a feature and our customer breaks some RFCs?
>
> Thanks,  Oleg.
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