Firewalls between LANs and the Internet are often configured to allow entire subnets to access the Internet. At the same time, printers and all-in-one devices are often assigned to the same subnet as clients. This means, for example, that network printers can also access information on the Internet. Even if an organisation's IT systems only access the Internet via a proxy, printers, copiers, and all-in-one devices can use the proxy, as well. If connections from the Internet to the devices are not rejected by the firewall, this can allow leaks of sensitive information from the organisation's data network under some circumstances. By the same token, a network-capable printer could also receive and distribute unwanted data from the Internet. A network printer may therefore become an opening for attacks from the Internet.