Overview
A device in Auvik can sometimes appear as Down even though it is powered on and functioning normally.
This typically occurs because Auvik determines device availability using ICMP (ping) reachability. If the Auvik collector cannot successfully ping the monitored device IP, the device may be marked as Down.
Common Reasons a Device Appears Down
A device may show as Down when:
- ICMP is blocked by a firewall or ACL
- The device is configured not to respond to ping requests
- The collector cannot reach the device management IP
- Routing, NAT, or VLAN changes interrupt connectivity
- Packet loss causes repeated ping failures
- The monitored IP address is no longer assigned to the device
- The device responds to other protocols but not ICMP
Troubleshooting
Step 1: Test ICMP Connectivity from the Collector Network
Verify whether the Auvik collector can successfully ping the device’s monitored IP address.
If the collector cannot ping the device, Auvik may report the device as Down.
Step 2: Review Firewall and ACL Rules
Confirm ICMP traffic is allowed between the collector and the monitored device.
Review:
- Local device firewall settings
- Network firewall rules
- ACLs
- VLAN and inter-subnet policies
- Security policies affecting ICMP traffic
Step 3: Verify the Monitored IP Address
Ensure Auvik is monitoring the correct management IP address.
If the device IP has changed or the monitored IP is outdated, Auvik may continue pinging an invalid address.
Step 4: Review Recent Network Changes
Check for recent:
- IP address changes
- VLAN modifications
- NAT updates
- Routing changes
- Firewall policy changes
- Device replacements or interface migrations
Best Practices
To reduce false Down alerts:
- Allow ICMP between collectors and monitored devices
- Use stable management IP addresses
- Keep device IP information current
- Review firewall and ACL changes affecting ICMP
- Ensure proper routing between collectors and monitored devices
Summary
Auvik determines device availability status using ICMP ping reachability.
A device may appear Down even while it is functioning normally if ICMP communication fails. When troubleshooting false Down alerts, always begin by verifying ICMP connectivity between the collector and the monitored device.