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[Bug 1533341] [NEW] Neutron MTU overhead computation assumes IPv4

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Dustin Lundquist <dustin@xxxxxxxxxxxx>
Date: Tue, 12 Jan 2016 20:04:59 -0000
Reply-to: Bug 1533341 <1533341@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

Public bug reported:

Neutron's MTU computation assumes 50 bytes overhead for VXLAN. This is
correct for IPv4, but in the case of IPv6 the the overhead is 70 bytes.
Similar assumptions are made for GRE and Geneve tunnels.

Additionally 802.1q tags could increase overhead by 4.

See: http://keepingitclassless.net/2014/03/mtu-considerations-vxlan/

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1533341

Title:
  Neutron MTU overhead computation assumes IPv4

Status in neutron:
  New

Bug description:
  Neutron's MTU computation assumes 50 bytes overhead for VXLAN. This is
  correct for IPv4, but in the case of IPv6 the the overhead is 70
  bytes. Similar assumptions are made for GRE and Geneve tunnels.

  Additionally 802.1q tags could increase overhead by 4.

  See: http://keepingitclassless.net/2014/03/mtu-considerations-vxlan/

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