shoaibjdev commented on issue #2996: [Bug Report] - GRE Isolation Broken in VPC Tier URL: https://github.com/apache/cloudstack/issues/2996#issuecomment-573301324 > @bdonnahue is this something you can pick up (have you pinged folds on the mailing lists) - or should we move it to 4.15 milestone, or perhaps close completely (although it seems like a bug, I'm not sure if anyone uses GRE these days)? **@andrijapanicsb** If GRE is not used widely, please advise what's the recommended SDN tunnel to be used with Open vSwitch for Advanced network on ACS. We managed to setup ACS 4.12 completely and VPCs are up, KVM VMs are also added and running but they are not assigned any IPs through OVS DHCP and appears like the tunnels are not being generated for the vm ports when using GRE. We came across this issue and several others reported on mailing list and realized GRE seems broken on ACS latest releases. So we need recommendation here for Advanced networks with Open vSwitch on KVM hosts.
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