Unable to ping from one network to other

I test the scenario you said.

VM1(1.1.1.2)--------(1.1.1.4)VM12(2.2.2.4)-----VM2(2.2.2.2)

The result is it works. I think you can check the route with route command in the VM1, VM12 and VM2. And then check the VM12 with ifconfig and route. And see if the ip_forward is really set by 'cat /proc/sys/net/ipv4/ip_forward'.

Jianyong

in VM12 i did 'cat /proc/sys/net/ipv4/ip_forward and the output is '1'

I dont see any error in the result of the route command:

VM1
Destination Gateway
default 10.10.10.4
10.10.10.0 *

VM2
Destination Gateway
default 20.20.20.4
20.20.20.0 *

VM12
Destination Gateway
10.10.10.0 10.10.10.4
10.10.10.0 *
20.20.20.0 20.20.20.4
20.20.20.0 *

I did traceroute and the output for the hops were * * *

The thing is, when I create VM12 (or any VM with multiple interfaces), it only shows one interface 'eth0' when i do ifconfig
so i had to do this:
sudo ifconfig eth1 20.20.20.4 netmask 255.255.255.0

Could this be the issue?

ok i enabled the remaining interfaces by editing /etc/network/interfaces but that too didnt help.

I think it is the sg blocks the ping traffic. so you need to add related sg rules.

Hi Adi,

From the following comments of yours:

The thing is, when I create VM12 (or any VM with multiple interfaces), it only shows one interface 'eth0' when i do ifconfig
so i had to do this:
sudo ifconfig eth1 20.20.20.4 netmask 255.255.255.0

Things may be the interface and ip address is added manually. Maybe it's not in the network of 20.20.20.x. Can u please give the output of "ovs-vsctl show" in VM12?

Sorry not in VM12 but for VM12 in its host node.

Hi,
I have added all the security group rules for tcp, udp and icmp so i think there is no problem over there.

I did the ovs-vsctl on the host and below is the result....unfortunately i am quite new so dont know how to run 'ovs-vsctl show' on a particular instance

root@controller:~# ovs-vsctl show
10f5f273-a7a0-47e1-a848-597df19d3a74
    Bridge br-int
        Port "tapf10a0e2a-d9"
            tag: 4095
            Interface "tapf10a0e2a-d9"
                type: internal
        Port "qvo38bc7050-80"
            tag: 16
            Interface "qvo38bc7050-80"
        Port patch-tun
            Interface patch-tun
                type: patch
                options: {peer=patch-int}
        Port "qvof0b73ab0-f9"
            tag: 1
            Interface "qvof0b73ab0-f9"
        Port "qvo424c5f5c-55"
            tag: 2
            Interface "qvo424c5f5c-55"
        Port br-int
            Interface br-int
                type: internal
        Port "qr-28572bb9-a6"
            tag: 3
            Interface "qr-28572bb9-a6"
                type: internal
        Port "tap0595b2c3-90"
            tag: 4095
            Interface "tap0595b2c3-90"
                type: internal
        Port "tap5fceccb8-a7"
            tag: 1
            Interface "tap5fceccb8-a7"
                type: internal
        Port "tap1fbce3bb-f5"
            tag: 4095
            Interface "tap1fbce3bb-f5"
                type: internal
        Port "tap3f7a0453-8e"
            tag: 3
            Interface "tap3f7a0453-8e"
                type: internal
        Port "qvo042c3e0b-21"
            tag: 7
            Interface "qvo042c3e0b-21"
        Port "tap6ca28777-22"
            tag: 4095
            Interface "tap6ca28777-22"
                type: internal
        Port "qvobff6b5ef-fe"
            tag: 1
            Interface "qvobff6b5ef-fe"
        Port "tapcfbe10b2-e2"
            tag: 4095
            Interface "tapcfbe10b2-e2"
                type: internal
        Port "qvo6ebccb67-9a"
            tag: 2
            Interface "qvo6ebccb67-9a"
        Port "tapd9ada95d-a0"
            tag: 2
            Interface "tapd9ada95d-a0"
                type: internal
    Bridge br-ex
        Port br-ex
            Interface br-ex
                type: internal
        Port "qg-c6f52b23-ac"
            Interface "qg-c6f52b23-ac"
                type: internal
    Bridge br-tun
        Port br-tun
            Interface br-tun
                type: internal
        Port patch-int
            Interface patch-int
                type: patch
                options: {peer=patch-tun}
    ovs_version: "1.4.0+build0"

Thanks

Hi,
I think you need to check step by step:
VM1(1.1.1.2)--------(1.1.1.4)VM12(2.2.2.4)-----VM2(2.2.2.2)

1. on VM1, VM2, VM12 the interface ip and route is correct.
2. if 1 is right, you need to use tcpdump to catch the icmp packet on interface 1.1.1.4 , 2.2.2.4 and 2.2.2.2 to find where block your packets.