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There appears to be a bug that UDP packet checksums aren't computed on
the way from a host to a guest, which means the recipient just drops
them. See https://bugs.launchpad.net/bugs/930962



By turning them off completely using ethtool, we work around the
problem.
Signed-off-by: Petr Pudlak <pudlak@google.com>
Reviewed-by: Klaus Aehlig <aehlig@google.com>

* Generalize 'kvm-ifup-os' to be also usable by Xen
* Include a target to build the 'xen-ifup-os' NIC script from the KVM
  one, given that they are very similar.
Signed-off-by: Jose A. Lopes <jabolopes@google.com>
Reviewed-by: Hrvoje Ribicic <riba@google.com>

The script 'tools/kvm-ifup-os' configures TAP network interfaces for
for instances, routing, DHCP server, etc.  Note that this script only
configures TAP network interfaces that are used by the instance
communication, that is, network interfaces named according to the
pattern 'gnt.com.%d', where '%d' is a number unique within a given
node.
Signed-off-by: Jose A. Lopes <jabolopes@google.com>
Reviewed-by: Michele Tartara <mtartara@google.com>