Create a stitch that pings IP addresses that have been given out

Hi there,

Can you explain further about your requirements? Together with the device and its IP address?

I have an FG-101F. Each time it hands out a DHCP address I need it to ping that address. This will need to happen at regular intervals unless the address is no longer in the assigned pool. 

Some food for thought (definitely not a ready-made solution):

Log ID 26001 is LOG_ID_DHCP_ACK, which is logged by FortiOS whenever it does a DHCP ACK, confirming an IP for a DHCP client's request. The log entry contains a field "ip" with client's assigned IP.

You could set up an automation trigger to start a stitch based off this. Then you could perhaps use the %%log.ip%% variable to ping this ip in a CLI script action: exec ping %%log.ip%%

With that said, stitches are meant to be one-off events. You will not be able to run this on schedule/periodically. You could perhaps prepend the ping command with a ping-options command, setting a long period and total number of pings, to effectively turn it into a long-running ping command, but this will not be robust. (it won't reflect IP changes that happen during the ongoing ping command; it will not automatically restart after any failure; and I would not be surprised at all if the CLI script gets eventually timed out and killed)

From a general perspective the script will be simple:

1. get the output from the logs into a file

2. use a regular expression  match the string " LOG_ID_DHCP_ACK" in that file to identify the log that contains the newly assigned IP and use another regular expression to match the IP address handed out to the client. Store that IP into another variable.

3. ping that IP and print the output