Neutron Network Connectivity Diagnostic Sequence
warningreliabilityUpdated Mar 27, 2024
Use structured ping tests and port status checks to isolate network failures between VMs, virtual routers, physical switches, and external networks.
Sources
How to detect:
When VM connectivity fails, systematically ping: same-subnet VMs, Neutron router interfaces, physical gateway, and external destinations. Check neutron port status (ACTIVE vs DOWN) and security group ICMP rules. Monitor neutron-l3-agent and neutron-dhcp-agent logs.
Recommended action:
Based on failure point: verify security groups allow ICMP, check L3/DHCP agent status, validate VLAN trunk configuration on physical switches, review Open vSwitch logs for virtual networking issues.