Troubleshooting VM Network Problems Using IP Fabric CLI

Troubleshooting VM network problems using IP Fabric CLI

In the event of a VM network connection problem, DNS issues, network devices connectivity issue, IP Fabric CLI is a useful helper.

CLI can be also used to access system and application logs as well as snapshot files.

System and application logs

System and application logs are placed in /var/log folder. Specifically IP Fabric application logs can be found in /var/log/nimpee.

Snapshots

Snapshots are available in osadmin home directory /home/osadmin/snapshots. Each folder inside represents one snapshot. Even if snapshots can be copied manually using SCP or SFTP it's strongly recommended to use the export feature in web UI.

Checking the network interface settings

When you log in through a VM console or SSH, network settings are displayed.

To display actual IP address use command:

Default gateway and other routes (if configured) can be check as follows:

Checking DNS

DNS can be checked using the dig or nslookup command.

For example, let's check A record and PTR (reverse) record of some device using dig.

For A record check ANSWER which contains requested IP address. Also SERVER section below is important as it tell us what DNS server answered our DNS query.

For PTR record check ANSWER which contains requested domain name.

If you prefer nslookup you can achieve the same results.

Testing connectivity to a network device

The very basic test is ping or traceroute.

To make sure that the network device is available from IP Fabric VM, you can use the telnet and ssh client from the command line.

For SSH use:

For telnet use:

Reboot and shutdown

IP Fabric VM can be also rebooted or shutdown using CLI.

For VM reboot just use reboot command without any parameters.

For VM shutdown use shutdown command without any parameters.