Good morning,
The first thing is to know:
- What services do you have?
- If there are any leaks or iptables security rule.
- if you have ssh configured to provide remote support.
After defining this, it is important to be clear that if the network is in production, it must take precautions when applying the changes. similarly, the public domain must be accessed to review existing configurations.
We are at your service.
regards
Jhoan La Cruz
Specialist in Networks and Servers.