Hello. It's work if I add a post-up instruction on the OVSBridge
iface vmbr1 inet manual ovs_type OVSBridge ovs_ports gre1 gre2 gre3 mtu 9000 post-up ( ovs-vsctl set Bridge vmbr1 rstp_enable=true && sleep 10 && ip link set gre_sys mtu 8872 ) But I'm not sure it's the best way ... Regards. Jean-Mathieu > De: "Jean-mathieu CHANTREIN" <[email protected]> > À: "ovs-discuss" <[email protected]> > Envoyé: Lundi 10 Septembre 2018 13:13:59 > Objet: [ovs-discuss] How to increase mtu on gre_sys interface ? > 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 > _______________________________________________ > discuss mailing list > [email protected] > https://mail.openvswitch.org/mailman/listinfo/ovs-discuss
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