
Chapter 11 IPSec VPN
Table 54 VPN > Setup > Edit > Manual (continued)
LABEL | DESCRIPTION |
Security Protocol |
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IPSec Protocol | Select ESP if you want to use ESP (Encapsulation Security Payload). The ESP |
| protocol (RFC 2406) provides encryption as well as some of the services offered |
| by AH. If you select ESP here, you must select options from the Encryption |
| Algorithm and Authentication Algorithm fields (described next). |
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Encryption | Select DES, 3DES or NULL from the |
Algorithm | When DES is used for data communications, both sender and receiver must |
| know the same secret key, which can be used to encrypt and decrypt the |
| message or to generate and verify a message authentication code. The DES |
| encryption algorithm uses a |
| that uses a |
| requires more processing power, resulting in increased latency and decreased |
| throughput. Select NULL to set up a tunnel without encryption. When you select |
| NULL, you do not enter an encryption key. |
Encryption Key | With DES, type a unique key 8 characters long. With 3DES, type a unique key 24 |
| characters long. Any characters may be used, including spaces, but trailing |
| spaces are truncated. |
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Authentication | Select SHA1 or MD5 from the |
Algorithm | SHA1 (Secure Hash Algorithm) are hash algorithms used to authenticate packet |
| data. The SHA1 algorithm is generally considered stronger than MD5, but is |
| slower. Select MD5 for minimal security and SHA1 for maximum security. |
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Authentication Key | Type a unique authentication key to be used by IPSec if applicable. Enter 16 |
| characters for MD5 authentication or 20 characters for SHA1 authentication. Any |
| characters may be used, including spaces, but trailing spaces are truncated. |
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Back | Click Back to return to the previous screen. |
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Apply | Click Apply to save your changes back to the ZyXEL Device. |
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Reset | Click Reset to begin configuring this screen afresh. |
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11.6 Viewing SA Monitor
Click Security, VPN and Monitor to open the SA Monitor screen as shown. Use this screen to display and manage active VPN connections.
When there is outbound traffic but no inbound traffic, the SA times out automatically after two minutes. A tunnel with no outbound or inbound traffic is "idle" and does not timeout until the SA lifetime period expires. You can also configure the ZyXEL Device to renegotiate an IPSec SA when the SA lifetime expires, even if there is no traffic.
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