In our environment we use
PXELINUX and
gPXE to NFS and iSCSI boot our diskless Windows and Linux machines respectively. Recently with a new update to our SUSE distributions we came across an issue where the machines would no longer get a secondary DHCP lease before the machine tries to connect to the NFS share and continue booting. Instead it would just time out and fail to boot. As an aside note, this issue seemed to be with a timing change in the dhcpcd binary that is built with the mkinitrd script as replacing it with an older version manually allows this to boot.
On certain Windows machines we would also have the same issue when gPXE tries to get it's configuration from a secondary DHCP chainload request (
similar to this person's issue), it would also time out and fail to boot. Changing the timings of the gPXE boot scripts overcomes this, but it does indeed add extra time to the boot process.
The odd thing about both of these problems is that it would only happen on certain hardware configurations and on others it would boot fine.
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