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How to make gre0 interface up

I am using icehouse neutron network node on ubuntu 14.04, using gre tunneling. I am not able to ping the VM ip from network node. I looked into network troubleshooting guide. One of the output shows gre0 and many interfaces are down. I am not sure why this interface is down? My knowledge on networking is basic. Can anyone has seen similar issue and share the steps to resolve.

The output of the ip a command:

root@network:~# ip a | grep stat 1: lo: <loopback,up,lower_up> mtu 65536 qdisc noqueue state UNKNOWN group default 2: eth0: <broadcast,multicast,up,lower_up> mtu 1500 qdisc mq state UP group default qlen 1000 3: eth1: <no-carrier,broadcast,multicast,up> mtu 1500 qdisc mq state DOWN group default qlen 1000 4: eth2: <broadcast,multicast,up,lower_up> mtu 1500 qdisc mq master ovs-system state UP group default qlen 1000 5: eth3: <broadcast,multicast> mtu 1500 qdisc noop state DOWN group default qlen 1000 6: gre0: <noarp> mtu 1476 qdisc noop state DOWN group default 7: gretap0: <broadcast,multicast> mtu 1476 qdisc noop state DOWN group default qlen 1000 8: tun0@NONE: <pointopoint,multicast,noarp,up,lower_up> mtu 1476 qdisc noqueue state UNKNOWN group default 9: ovs-system: <broadcast,multicast> mtu 1500 qdisc noop state DOWN group default 10: br-ex: <broadcast,up,lower_up> mtu 1500 qdisc noqueue state UNKNOWN group default 13: br-int: <broadcast,up,lower_up> mtu 1500 qdisc noqueue state UNKNOWN group default 16: br-tun: <broadcast,up,lower_up> mtu 1500 qdisc noqueue state UNKNOWN group default root@network:~#

How to make gre0 interface up

I am using icehouse neutron network node on ubuntu 14.04, using gre tunneling. I am not able to ping the VM ip from network node. I looked into network troubleshooting guide. One of the output shows gre0 and many interfaces are down. I am not sure why this interface is down? My knowledge on networking is basic. Can anyone has seen similar issue and share the steps to resolve.

resolve. The output of the ip a command:

command: root@network:~# ip a | grep stat 1: lo: <loopback,up,lower_up> <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default 2: eth0: <broadcast,multicast,up,lower_up> <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000 3: eth1: <no-carrier,broadcast,multicast,up> <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000 4: eth2: <broadcast,multicast,up,lower_up> <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq master ovs-system state UP group default qlen 1000 5: eth3: <broadcast,multicast> <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000 6: gre0: <noarp> <NOARP> mtu 1476 qdisc noop state DOWN group default 7: gretap0: <broadcast,multicast> <BROADCAST,MULTICAST> mtu 1476 qdisc noop state DOWN group default qlen 1000 8: tun0@NONE: <pointopoint,multicast,noarp,up,lower_up> <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1476 qdisc noqueue state UNKNOWN group default 9: ovs-system: <broadcast,multicast> <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default 10: br-ex: <broadcast,up,lower_up> <BROADCAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN group default 13: br-int: <broadcast,up,lower_up> <BROADCAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN group default 16: br-tun: <broadcast,up,lower_up> mtu 1500 qdisc noqueue state UNKNOWN group default root@network:~#

<BROADCAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN group default root@network:~#