Hello.
I use OVS on a Proxmox cluster and I configure GRE Tunnel like this:
http://docs.openvswitch.org/en/latest/howto/tunneling/
I activated the jumbo frame (mtu 9000) on physical switch, physical and virtual
interfaces (OVSBridge and OVSTunnel gre). By default, the gre_sys mtu is set to
1472 (I suppose to prevent the overhead of 28 bytes of GRE(8 bytes) and new IP
header(20 bytes)) .
I can modify it manually with:
ip link set gre_sys mtu 8872 #(9000-28)
So, 2VM on 2 hosts can communicate correctly with a 1500 mtu
user@VM1:$ ping -M do -s 1472 $IP_VM2 # 1500 - (ICMP(8 bytes) + IPV4(20
bytes))=1472
PING IP_VM2 1472(1500) bytes of data.
1480 bytes from IP_VM2: icmp_seq=1 ttl=64 time=0.227 ms
...
I would like to know what is the best practice to make it persistent in
/etc/network/interfaces file ?
Best regards.
Jean-Mathieu
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