yahoo-eng-team team mailing list archive
-
yahoo-eng-team team
-
Mailing list archive
-
Message #33744
[Bug 1465280] [NEW] dhcp agent: use the OUTPUT chain instead of POSTROUTING to calculate checksum for local dhcp packets
Public bug reported:
Since Kilo, dhcp agent calculates dhcp packet checksum to hack around a
bug in libvirt when a packet is sent locally:
https://review.openstack.org/148718
There is a comment from Neil there saying: "Did you ever consider using
the OUTPUT chain instead of POSTROUTING, for this change? It seems to
me that that would reduce the impact of the added iptables rule, because
with OUTPUT it would only hit locally originated packets, whereas with
POSTROUTING it hits both locally originated and forwarded packets."
If we can indeed avoid the hack for packets that fly thru the real
network, then it's the better solution. So it should be considered.
** Affects: neutron
Importance: Undecided
Status: New
--
You received this bug notification because you are a member of Yahoo!
Engineering Team, which is subscribed to neutron.
https://bugs.launchpad.net/bugs/1465280
Title:
dhcp agent: use the OUTPUT chain instead of POSTROUTING to calculate
checksum for local dhcp packets
Status in OpenStack Neutron (virtual network service):
New
Bug description:
Since Kilo, dhcp agent calculates dhcp packet checksum to hack around
a bug in libvirt when a packet is sent locally:
https://review.openstack.org/148718
There is a comment from Neil there saying: "Did you ever consider
using the OUTPUT chain instead of POSTROUTING, for this change? It
seems to me that that would reduce the impact of the added iptables
rule, because with OUTPUT it would only hit locally originated
packets, whereas with POSTROUTING it hits both locally originated and
forwarded packets."
If we can indeed avoid the hack for packets that fly thru the real
network, then it's the better solution. So it should be considered.
To manage notifications about this bug go to:
https://bugs.launchpad.net/neutron/+bug/1465280/+subscriptions
Follow ups
References