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I was looking through my DLink Routers in the tools->misc section and noticed it gave me choice about VPN:
VPN Pass-THrough
Allows VPN connections to work through the DI-604.
PPTP Enabled Disabled
IPSec Enabled Disabled
can you explain what PPTP and IPSec are and whether they are a security threat
Hey now, look what google gave me !!!
http://www.securitydogs.com/vpn_library.html
http://ece.gmu.edu/courses/ECE543/pr...F01/AlArVe.PDF
http://www.tpci.com/advnet_3.htm
Enjoy reading,
The short answer, minus all the reading, is that many encryption protocols used by VPN (IPSec and GRE are two) are seperate from TCP/IP (for example, IPSec is protocol 50). If you have any clients on your network that need to connect to a VPN concentrator or through a firewall using VPN, you will have to allow the proper protocols to pass to make the connection (IPSec also needs UDP 500).
If you aren't making any VPN connections, I would recommend leaving them off under the general philosophy of 'If you aren't using it, don't enable it.'
/nebulus
thank you both :)