P-661H-D Series Support Notes
General FAQ...........................................................................................28
1. What is VPN? .......................................................................28
2. Why do I need VPN?............................................................28
3. What are most common VPN protocols?..............................28
4. What is PPTP? .....................................................................28
5. What is L2TP?......................................................................29
6. What is IPSec?.....................................................................29
7. What secure protocols does IPSec support?........................29
8. What are the differences between 'Transport mode' and
'Tunnel mode’?
.........................................................................29
9. What is SA?..........................................................................30
10. What is IKE?.......................................................................30
11. What is Pre-Shared Key?...................................................30
12. What are the differences between IKE and manual key VPN?
.................................................................................................30
13. What is Phase 1 ID for?......................................................30
14. What is FQDN? ..................................................................31
15. When should I use FQDN?.................................................31
Advanced FAQ .......................................................................................31
1. How do I configure VPN? .....................................................31
2. What kind of VPN protocols are supported on P-661H-D? 32
3. What types of encryption does P-661H-D VPN support? .....32
4. What types of authentication does P-661H-D VPN support?32
5. I am planning my P-661H-D VPN configuration. What do I
need to know?
..........................................................................32
6. Does P-661H-D support dynamic secure gateway IP?.........33
7. What VPN gateway has been tested with P-661H-D
successfully?
............................................................................33
8. What VPN software has been tested with P-661H-D
successfully?
...........................................................................34
11. How do I configure P-661H-D with NAT for internal servers?
.................................................................................................35
12. I am planning my P-661H-D behind a NAT router. What do I
need to know?
..........................................................................35
13. How can I keep a tunnel alive?...........................................35
14. Single, Range, Subnet, which types of IP address do
P-661H-D support in VPN/IPSec?
............................................36
15. Can P-661H-D support VPN passthrough?........................36
16. Can P-661H-D behave as a NAT router supporting IPSec
passthrough and an IPSec gateway simultaneously?
..............36
Application Notes.....................................................................................37
General Application Notes ......................................................................37
1. Internet Access Using P-661H-D under Bridge mode ..........37
2. Internet Access Using P-661H-D under Routing mode ........39
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