User's Manual

Enterprise 5-Port 10/100/1000T VPN Security Router
VR-300 series
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by using it three times. It can achieve an algorithm up to 168
bits.
3. SHA1: The SHA1 is a revision of SHA. It has improved the
shortcomings of SHA. By producing summary hash values, it
can achieve an algorithm up to 160 bits.
4. SHA2: Either 256, 384 or 512 can be chosen.
5. MD5 Algorithm: MD5 processes a variably long message into
a fixed-length output of 128 bits.
ESP Keylife
You can specify how long ESP packets are valid.
Perfect Forward
Secrecy (PFS)
Set the function as enable or disable.
4.7.2 GRE
This section assists you in setting the GRE Tunnel as shown in Figure 4-50.
Figure 4-50: GRE
Object Description
GRE Tunnel
Set the function as enable or disable.
Add GRE Tunnel
Go to the Add GRE Tunnel page to add a new tunnel.