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Support prefixed ranges of ipv6 addresses in dhcp-host.

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When a request matching the clid or mac address is
recieved the server will iterate over all candidate
addresses until it find's one that is not already
leased to a different clid/iaid and advertise
this address.

Using multiple reservations for a single host makes it
possible to maintain a static leases only configuration
which support network booting systems with UEFI firmware
that request a new address (a new SOLICIT with a new IA_NA
option using a new IAID) for different boot modes, for
instance 'PXE over IPv6', and 'HTTP-Boot over IPv6'. Open
Virtual Machine Firmware (OVMF) and most UEFI firmware
build on the EDK2 code base exhibit this behaviour.
This commit is contained in:
Simon Kelley
2020-02-03 23:58:45 +00:00
parent 515ba97595
commit 79aba0f10a
7 changed files with 122 additions and 42 deletions
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8
CHANGELOG
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@@ -69,6 +69,14 @@ version 2.81
different interfaces on the same IPv6 net, and we're doing
RA/DHCP service on only one of them. Thanks to NIIBE Yutaka
for spotting this case and making the initial patch.
Support prefixed ranges of ipv6 addresses in dhcp-host.
This eases problems chain-netbooting, where each link in the
chain requests an address using a different UID. With a single
address, only one gets the "static" address, but with this
fix, enough addresses can be reserved for all the stages of the
boot. Many thanks to Harald Jensås for his work on this idea and
earlier patches.
version 2.80