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--dhcp-reply-delay option to workaround PXE client bugs.

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Adds option to delay replying to DHCP packets by one or more seconds.
This provides a workaround for a PXE boot firmware implementation
that has a bug causing it to fail if it receives a (proxy) DHCP
reply instantly.

On Linux it looks up the exact receive time of the UDP packet with
the SIOCGSTAMP ioctl to prevent multiple delays if multiple packets
come in around the same time.
This commit is contained in:
Floris Bos
2017-04-09 23:07:13 +01:00
committed by Simon Kelley
parent 60704f5e2e
commit 503c609149
8 changed files with 158 additions and 57 deletions
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CHANGELOG
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@@ -82,6 +82,9 @@ version 2.77
Allow use of MAC addresses with --tftp-unique-root. Thanks
to Floris Bos for the patch.
Add --dhcp-reply-delay option. Thanks to Floris Bos
for the patch.
version 2.76
@@ -90,7 +93,7 @@ version 2.76
least, 0.0.0.0 accesses the local host, so could
be targets for DNS rebinding. See RFC 5735 section 3
for details. Thanks to Stephen Röttger for the bug report.
Enhance --add-subnet to allow arbitrary subnet addresses.
Thanks to Ed Barsley for the patch.