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I start to understand your problem. Rather than using the poorly supported serial console (which seems to have the additional inconvenience of removing the console log), allow me to propose alternatives:

• Upload the script to the instance (you can use user-data), have it test the network connectivity and report the result to the console. Then check the console log.
• Connect to the fixed IP from the DHCP network namespace.

I start to understand your problem. Rather than using the poorly supported serial console (which seems to have the additional inconvenience of removing the console log), allow me to propose alternatives:

• Upload the script to the instance (you can use user-data), user-data at instance launch), have it test the network connectivity and report the result to the console. Then check the console log.
• Connect to the fixed IP from the DHCP network namespace.