Commit d230aea2 authored by Petr Pudlak's avatar Petr Pudlak
Browse files

Update the NEWS file about the wrong UDP checksums bug



We need to explain the problem and remind the administrator to have
'ethtool' installed.
Signed-off-by: default avatarPetr Pudlak <pudlak@google.com>
Reviewed-by: default avatarKlaus Aehlig <aehlig@google.com>
parent 1e21a82c
......@@ -90,6 +90,20 @@ implemented in 2.12:
- Issues 708 and 602: The secret parameters are currently still written
to disk in the job queue.
Known issues
~~~~~~~~~~~~
- *Wrong UDP checksums in DHCP network packets:*
If an instance communicates with the metadata daemon and uses DHCP to
obtain its IP address on the provided virtual network interface,
it can happen that UDP packets have a wrong checksum, due to
a bug in virtio. See for example https://bugs.launchpad.net/bugs/930962
Ganeti works around this bug by disabling the UDP checksums on the way
from a host to instances (only on the special metadata communication
network interface) using the ethtool command. Therefore if using
the metadata daemon the host nodes should have this tool available.
Version 2.12.0 beta1
--------------------
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