sentence: Firewalls can provide a secure connection between two networks.
sentences_after: This is called 'tunnelling'. The data may be encrypted. It is unencrypted at the other end. Since the firewalls are doing this, the rest of the network is unaware of it.
concept_name: firewall
headings: Firewall (networking) Other things firewalls are used for Tunnelling
categories: Software Internet security