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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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6
man/dnsmasq.8
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@@ -1790,6 +1790,12 @@ a router to advertise prefixes but not a route via itself.
.B --ra-param=low,60,1200
The interface field may include a wildcard.
.TP
.B --dhcp-reply-delay=[tag:<tag>,]<integer>
Delays sending DHCPOFFER and proxydhcp replies for at least the specified number of seconds.
This can be used as workaround for bugs in PXE boot firmware that does not function properly when
receiving an instant reply.
This option takes into account the time already spent waiting (e.g. performing ping check) if any.
.TP
.B --enable-tftp[=<interface>[,<interface>]]
Enable the TFTP server function. This is deliberately limited to that
needed to net-boot a client. Only reading is allowed; the tsize and