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Article | REF: TE7550 V2

Firewalls. The pocketknife for enforcing computer security

Author: Maryline LAURENT

Publication date: October 10, 2017, Review date: January 3, 2024

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13. Limitations

Generally placed at the border of a private network, a firewall is unable to control internal exchanges. It therefore remains ineffective against internal attacks.

Whether maliciously or for practical reasons, an employee may wish to bypass the filtering performed on the company firewall by creating a tunnel. The equipment used to create the tunnel should be placed on either side of the firewall. In this way, if the firewall limits itself to filtering IP and TCP headers (§ 5

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