[ipxe-devel] Problem with accessing iPXE via UNDI

Jarrod Johnson jarrod.b.johnson at gmail.com
Fri Jul 12 01:01:04 UTC 2013

It might have.  My problem is at the time, I chased down the sources of the
neighbor table being full amidst booting several thousand servers at once.
 After having a scheme that works, its hard for me to justify the
experiment when I'm on multi thousand server configs nowadays.  In theory a
small testbed could be used, however I don't really see the pressing need
to send back TCP reset when a second prior it would not be able to
(firmware not bothering) and a couple of seconds later it won't be able to
(in kernel prior to nic driver) in our usage (and half the time, the full
OS won't send out a TCP reset due to firewall rules, so restoring the iPXE
capability isn't something we are overly interested in).

On Thu, Jul 11, 2013 at 8:11 PM, Michael Brown <mbrown at fensystems.co.uk>wrote:

> On 12/07/13 01:20, Jarrod Johnson wrote:
>> FYI, in the xcat branch, we don't send RST.  In our case it was because
>> TCP services pounding randomly on IPs would cause ipxe to get neighbor
>> table entries preventing it from talking to intended servers.
> How much pounding happens, and does this problem still occur with current
> iPXE?  I put in some changes back in March 2012 to make the number of ARP
> cache entries dynamic, which should alleviate the problem (relative to a
> fixed-size cache).
> Michael
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