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# Transmission Using IPsec

For securer communications, this machine supports the IPsec protocol. When applied, IPsec encrypts data packets at the network layer using shared key encryption. The machine uses encryption key exchange to create a shared key for both sender and receiver. To achieve even higher security, you can also renew the shared key on a validity period basis.

- IPsec is not applied to data obtained through DHCP, DNS, or WINS.

- IPsec compatible operating systems are Windows XP SP2, Windows Vista/7, Windows Server 2003/2003 R2/2008/2008 R2, Mac OS X 10.4.8 and later, Red Hat Enterprise Linux WS 4.0, and Solaris 10. However, some setting items are not supported depending on the operating system. Make sure the IPsec settings you specify are consistent with the operating system's IPsec settings.

- If you cannot access Web Image Monitor due to IPsec configuration problems, disable IPsec under [Admin. Tools] on the control panel, and then access Web Image Monitor.

- For details about specifying the IPsec settings using Web Image Monitor, see Configuring the IPsec Settings.

- For details about enabling and disabling IPsec using the control panel, see Enabling and Disabling IPsec Using the Control Panel.

Related topics

Encryption and Authentication by IPsec
Security Association
Encryption Key Exchange Settings Configuration Flow
Specifying Encryption Key Exchange Settings
Specifying IPsec Settings on the Computer
Enabling and Disabling IPsec Using the Control Panel