How can I troubleshoot if networks of VM instances on two hosts are not interconnected? : ZStack International

How can I troubleshoot if networks of VM instances on two hosts are not interconnected? Print

Created by: ZStack Support

Modified on: Mon, 28 Mar, 2022 at 12:11 PM

Based on different types of networks, troubleshoot this problem by following the steps below:

For the VLAN network, if the NIC of the network is eth0, VLAN ID is 25.
1. Run ifconfig br_eth0_25 the configured IP address to configure one IP address for different network bridges on both hosts respectively.
2. Run arping -I br_eth0_25 the configured IP address on one of the hosts to decide whether the IP address is connected. If not connected, check whether your switch is configured properly.
3. Check whether the switch is configured with a trunk port, all VLAN IDs are allowed, and VLAN 25 is included in the VLAN database.
4. Run ip addr del the configured IP dev br_eth0_25 to delete the IP configurations on both hosts after intercommunications between these hosts are tested.
For the VXLAN network, we recommend that you check whether the VTEP IP addresses corresponded by the VXLAN network can be intercommunicated properly.

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