• For successful authentication, the sender and receiver must specify the same authentication
algorithm and authentication key. The authentication algorithm and authentication key are
specified automatically.
AH Protocol
The AH protocol provides secure transmission through authentication of packets only, including
headers.
• For successful authentication, the sender and receiver must specify the same authentication
algorithm and authentication key. The authentication algorithm and authentication key are
specified automatically.
AH Pr ESP Protocol
When combined, the ESP and AH protocols provide secure transmission through both encryption
and authentication. These protocols provide header authentication.
• For successful encryption, both the sender and receiver must specify the same encryption
algorithm and encryption key. The encryption algorithm and encryption key are specified
automatically.
• For successful authentication, the sender and receiver must specify the same authentication
algorithm and authentication key. The authentication algorithm and authentication key are
specified automatically.
• Some operating systems use the term "Compliance" in place of "Authentication".
Security Association
This machine uses encryption key exchange as the key setting method. With this method, agreements
such as the IPsec algorithm and key must be specified for both sender and receiver. Such agreements
form what is known as an SA (Security Association). IPsec communication is possible only if the
receiver's and sender's SA settings are identical.
The SA settings are auto configured on both parties' machines. However, before the IPsec SA can be
established, the ISAKMP SA (Phase 1) settings must be auto configured. When this is done, the IPsec SA
(Phase 2) settings, which allow actual IPsec transmission, will be auto configured.
Also, for further security, the SA can be periodically auto updated by applying a validity period (time
limit) for its settings. This machine only supports IKEv1 for encryption key exchange.
Multiple settings can be configured in the SA.
Settings 1-10
You can configure ten separate sets of SA details (such as different shared keys and IPsec
algorithms).
IPsec policies are searched through one by one, starting at [No.1].
12. Appendix
408
Summary of Contents for M C251FW
Page 2: ......
Page 23: ...3 2 1 ECC105 Interior ECC106 4 3 2 1 Guide to Components 21 ...
Page 45: ...Deleting characters 1 Press to delete characters Entering Characters 43 ...
Page 48: ...1 Guide to the Machine 46 ...
Page 82: ...2 Paper Specifications and Adding Paper 80 ...
Page 100: ...3 Printing Documents 98 ...
Page 124: ...4 Copying Originals 122 ...
Page 170: ...5 Scanning Originals 168 ...
Page 216: ...6 Sending and Receiving a Fax 214 ...
Page 270: ...7 Configuring the Machine Using the Control Panel 268 ...
Page 346: ...6 Close the ADF cover 9 Maintaining the Machine 344 ...
Page 360: ...Main unit DUE292 1 3 2 1 DUE288 2 DUE289 10 Troubleshooting 358 ...
Page 361: ...3 DUE290 Waste toner bottle ECC168 Paper feed unit DUE320 1 Removing Paper Jams 359 ...
Page 440: ...12 Appendix 438 ...
Page 445: ...MEMO 443 ...
Page 446: ...MEMO 444 EN GB EN US EN AU M0EQ 8504A ...
Page 447: ......
Page 448: ...EN GB EN US EN AU M0EQ 8504A 2021 2022 Ricoh Co Ltd ...