I tried to implement tunneling between KVM virtual machines on two hosts
that are using public IP-s but are on the same LAN (Hetzner provider).
Virtual machines on both hosts are using same private 192. network.
I installed and configured Open vSwitch 2.0.0 on Centos 6.5. Standard
networking, bridging and all is working fine, as I can see. Access to
Internet from VM-s is working fine.
First I tried to implement GRE but I was getting errors:
kernel: gre_compat_init: cannot register gre protocol handler
kernel: openvswitch: cannot register gre protocol handler
Then I tried with VXLAN and configuration went fine, tunnel was
established, ping and SSH between VM-s on different hosts is working. BUT
… data transfer would choke and break , … I tried SCP and DD with NC
transfers and all is breaking.
TCPDUMP is showing a lot of error like “out of order”, “dup ack”, “rst”…
NETPERF is showing very slow speed with a lot of retransmissions:
Throughput,Local Transport Retransmissions
755.06,1959
Curent configuration is like this:
Bridge "ovsbr0"
Port "ovsbr0"
Interface "ovsbr0"
type: internal
Port "eth0"
Interface "eth0"
Bridge "ovsgrebr1"
Port "vx1"
Interface "vx1"
type: vxlan
options: {remote_ip="78.x.x.x"}
Port "ovsgrebr1"
Interface "ovsgrebr1"
type: internal
Port "mysqlh1_net"
Interface "mysqlh1_net"
ovs_version: "2.0.0"
I tried to lower MTU on VM-s to 1450, but made no difference.
What could be the problem? Should I scrape it all and give up on tunneling
or do I have some other option?
Thanks very much.
Kind regards,
Igor
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