Reviewed: https://review.openstack.org/320121 Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=51a697817da849c8f9dae9651f17cd863e170fdc Submitter: Jenkins Branch: master
commit 51a697817da849c8f9dae9651f17cd863e170fdc Author: Brian Haley <[email protected]> Date: Mon May 23 15:50:06 2016 -0400 Change tunnel MTU calculation to support IPv6 The IPv6 header is twice the size of the IPv4 header, 40 vs 20 bytes, but the tunnel overhead constants are static, only accounting for an IPv4 header in all cases. In order to be correct it needs to treat the tunnel overhead different from the IP overhead at L3. This required removing the 20 byte IP overhead from the tunnel type overhead constants and creating a new option, ml2.overlay_ip_version, in order for the server to know which version will be used, since it calculates the MTU for the network. A version mis-match will now cause a tunnel sync to fail on the server. Moved all MTU tests to a common location to remove duplication. DocImpact Change-Id: Ia2546c4c71ff48b9fe2817fbad22b1fbf85f325b Closes-bug: #1584940 ** Changed in: neutron Status: In Progress => Fix Released -- You received this bug notification because you are a member of Yahoo! Engineering Team, which is subscribed to neutron. https://bugs.launchpad.net/bugs/1584940 Title: MTU calculations only support IPv4 tunnel endpoints don't account for IPv6 Status in neutron: Fix Released Bug description: The MTU calculations are using using values from the ML2 constants file like: # Network Type MTU overhead GENEVE_ENCAP_MIN_OVERHEAD = 50 GRE_ENCAP_OVERHEAD = 42 VXLAN_ENCAP_OVERHEAD = 50 But those values are assuming IPv4 - for example, IPv4 header of 20 bytes, VXLAN header of 30 bytes. We should be calculating the IP overhead independent of the tunnel type overhead in order to support an IPv6 data plane. Since we know local_ip (tunnel endpoint) from ml2_conf.ini, we can dynamically calculate this at startup time. To manage notifications about this bug go to: https://bugs.launchpad.net/neutron/+bug/1584940/+subscriptions -- Mailing list: https://launchpad.net/~yahoo-eng-team Post to : [email protected] Unsubscribe : https://launchpad.net/~yahoo-eng-team More help : https://help.launchpad.net/ListHelp
