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Michaelyang's avatar
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Feb 06, 2023

If there is no firewall, the risk of problems

Hello, My architecture is as follows " Clients -> firewall -> F5 -> Server " I would like to ask if it is risky to open all ports in the client->F5 VIP section of the firewall? For example. 445 ...
  • Paulius's avatar
    Feb 06, 2023

    Michaelyang because the F5 is not configured to listen on 445 in the example you have provided you do not have a risk currently for the backend servers or the F5. The keyword here is currently, it is possible that in the future a vulnerability might exist that does leave your F5 or backend servers vulnerable to an attack and why you should only ever allow the ports you need through and not everything. What is the reasoning for allowing all ports through to the F5 virtual server? If the reasoning here is because someone doesn't want to go allow each port when you start to use it that is an extremely flawed and a huge security risk approach to managing a network. It's best to stick to best practices and not to encourage practices that put your network in a vulnerable security posture.