Layer 3: Network Layer
Overview: Layer includes issues related to addressing, routing and traffic control
Technologies in Scope: IPv4, IPv6, ICMP
Tools for Troubleshooting: Advanced IP Scanner
- Can you ping the device from the local network? (ensure it’s the current IP – DHCP)
- Can you ping the DNS server from the camera subnet? (not all DNS servers respond to ICMP)
- Using a tool such as Advanced IP Scanner, attempt to scan for the device. Preferably, this is performed from the same VLAN as the device itself. If not, less information about the device will come through. A good way to spot an Axis device in these devices is to expand the item and verify it says “HTTP, Apache httpd”
- Verify that the IP address of the device
- Confirm the IP of the device did not change and that another device did not take its place. Windows builds an arp table for communication purposes and the command “arp–a” will show the current arp table to compare IP addresses to mac addresses as seen from the perspective of your windows machine.
- While patched into the same VLAN as the device(s), issue an ipconfig/all and verify your hardwired ethernet adapter receives a DNS server
- Verify if the DNS server responds to ICMP (not all DNS servers respond to ICMP, but most do and it’s a quick test to ensure basic connectivity and rule out other issues)
