Chapter 22 VPN
VMG5313-B10A/-B30A Series User’s Guide
257
Perfect Forward
Secrecy (PFS)
Select whether or not you want to enable Perfect Forward Secrecy (PFS)
PFS changes the root key that is used to generate encryption keys for each IPSec SA. The
longer the key, the more secure the encryption, but also the longer it takes to encrypt and
decrypt information. Both routers must use the same DH key group. Choices are:
None
- do not use any random number.
768bit(DH Group1)
- use a 768-bit random number
1024bit(DH Group2)
- use a 1024-bit random number
1536bit(DH Group5)
- use a 1536-bit random number
2048bit(DH Group14)
- use a 2048-bit random number
3072bit(DH Group15)
- use a 3072-bit random number
4096bit(DH Group16)
- use a 4096-bit random number
Key Life Time
Define the length of time before an IPSec SA automatically renegotiates in this field.
A short SA Life Time increases security by forcing the two VPN gateways to update the
encryption and authentication keys. However, every time the VPN tunnel renegotiates, all
users accessing remote resources are temporarily disconnected.
The following fields are available if you select Manual in the Key Exchange Method field.
Encryption
Algorithm
Select which key size and encryption algorithm to use in the IKE SA. Choices are:
DES
- a 56-bit key with the DES encryption algorithm
3DES
- a 168-bit key with the DES encryption algorithm
EPS_NULL
- no encryption key or algorithm
Encryption
Key
This field is applicable when you select an Encryption Algorithm.
Enter the encryption key, which depends on the encryption algorithm.
DES
- type a unique key 16 hexadecimal characters long
3DES
- type a unique key 48 hexadecimal characters long
Authentication
Algorithm
Select which hash algorithm to use to authenticate packet data. Choices are MD5, SHA1.
SHA is generally considered stronger than MD5, but it is also slower.
Authentication
Key
Enter the authentication key, which depends on the authentication algorithm.
MD5
- type a unique key 32 hexadecimal characters long
SHA1
- type a unique key 40 hexadecimal characters long
SPI
Type a unique SPI (Security Parameter Index) in hexadecimal characters.
The SPI is used to identify the VMG during authentication.
The VMG and remote IPSec router must use the same SPI.
OK
Click
OK
to save your changes.
Cancel
Click
Cancel
to restore your previously saved settings.
Table 101
Security > IPSec VPN: Add/Edit
LABEL
DESCRIPTION
Summary of Contents for VMG5313-B10A
Page 15: ...15 PART I User s Guide ...
Page 16: ...16 ...
Page 32: ...Chapter 2 The Web Configurator VMG5313 B10A B30A Series User s Guide 32 ...
Page 40: ...Chapter 4 Tutorials VMG5313 B10A B30A Series User s Guide 40 ...
Page 71: ...71 PART II Technical Reference ...
Page 72: ...72 ...
Page 78: ...Chapter 5 Network Map and Status Screens VMG5313 B10A B30A Series User s Guide 78 ...
Page 106: ...Chapter 6 Broadband VMG5313 B10A B30A Series User s Guide 106 ...
Page 162: ...Chapter 9 Routing VMG5313 B10A B30A Series User s Guide 162 ...
Page 180: ...Chapter 10 Quality of Service QoS VMG5313 B10A B30A Series User s Guide 180 ...
Page 198: ...Chapter 11 Network Address Translation NAT VMG5313 B10A B30A Series User s Guide 198 ...
Page 210: ...Chapter 14 Interface Group VMG5313 B10A B30A Series User s Guide 210 ...
Page 218: ...Chapter 15 USB Service VMG5313 B10A B30A Series User s Guide 218 ...
Page 232: ...Chapter 17 Firewall VMG5313 B10A B30A Series User s Guide 232 ...
Page 240: ...Chapter 19 Parental Control VMG5313 B10A B30A Series User s Guide 240 ...
Page 250: ...Chapter 21 Certificates VMG5313 B10A B30A Series User s Guide 250 ...
Page 296: ...Chapter 23 Voice VMG5313 B10A B30A Series User s Guide 296 ...
Page 300: ...Chapter 24 Log VMG5313 B10A B30A Series User s Guide 300 ...
Page 308: ...Chapter 27 xDSL Statistics VMG5313 B10A B30A Series User s Guide 308 ...
Page 318: ...Chapter 30 Remote Management VMG5313 B10A B30A Series User s Guide 318 ...
Page 322: ...Chapter 32 TR 064 VMG5313 B10A B30A Series User s Guide 322 ...
Page 332: ...Chapter 36 Log Setting VMG5313 B10A B30A Series User s Guide 332 ...
Page 336: ...Chapter 37 Firmware Upgrade VMG5313 B10A B30A Series User s Guide 336 ...
Page 352: ...Chapter 40 Troubleshooting VMG5313 B10A B30A Series User s Guide 352 ...
Page 354: ...354 ...
Page 374: ...Appendix B Wireless LANs VMG5313 B10A B30A Series User s Guide 374 ...
Page 390: ...Appendix E Legal Information VMG5313 B10A B30A Series User s Guide 390 ...