Open Stack

Hi,

My cloud is using IPv4 addressing to access metadata only, all 
regular/other traffic is all IPv6. I'm facing a problem now where 
certain (!) downloads are corrupted, eg. making it impossible to yum 
update my kernel (this is a CentOS 7 instance). The instance is 
receiving a MTU of 1454 per DHCPv4, all other interfaces involved are 
set to 1500.

Setup:
- controller node running neutron and openvswitch
- compute node running the instances and neutron-openvswitch-agent

The cloud is configured with GRE tunnels and uses ML2 (openvswitch).

How to aproach this?

Regards,
Harm