User Manual
Geneko GWR High Speed Router Series
39
Settings – VPN Settings
Virtual private network (VPN) is a communications network tunneled through another network and
dedicated to a specific network. One common application of VPN is secure communication through the public
Internet, but a VPN need not have explicit security features, such as authentication or content encryption. VPNs, for
example, can be used to separate the traffic of different user communities over an underlying network with strong
security features.
A VPN may have best–effort performance, or may have a defined Service Level Agreement (SLA) between
the VPN customer and the VPN service provider. Generally, a VPN has a topology more complex than point–to–
point. The distinguishing characteristics of VPNs are not security or performance, but that they overlay other
network(s) to provide a certain functionality that is meaningful to a user community.
Generic Routing Encapsulation (GRE)
Originally developed by Cisco, generic routing encapsulation (GRE) is now a standard, defined in RFC 1701,
RFC 1702, and RFC 2784. GRE is a tunneling protocol used to transport packets from one network through another
network.
If this sounds like a virtual private network (VPN) to you, that’s because it theoretically is: Technically, a GRE
tunnel is a type of a VPN — but it isn’t a secure tunneling method. However, you can encrypt GRE with an
encryption protocol such as IPSec to form a secure VPN. In fact, the point–to–point tunneling protocol (PPTP)
actually uses GRE to create VPN tunnels. For example, if you configure Microsoft VPN tunnels, by default, you use
PPTP, which uses GRE.
Solution where you can use GRE protocol:
•
You need to encrypt multicast traffic. GRE tunnels can carry multicast packets — just like real network
interfaces — as opposed to using IPSec by itself, which can’t encrypt multicast traffic. Some examples of
multicast traffic are OSPF, EIGRP. Also, a number of video, VoIP, and streaming music applications use
multicast.
•
You have a protocol that isn’t routable, such as NetBIOS or non–IP traffic over an IP network. You could use
GRE to tunnel IPX/AppleTalk through an IP network.
•
You need to connect two similar networks connected by a different network with different IP addressing.
Click
VPN Settings
Tab, to open the VPN configuration screen. In the
Figure 23
you can see screenshot of
GRE
Tab configuration menu.
VPN Settings / GRE Tunneling Parameters
Label
Description
Enable
This check box allows you to activate/deactivate VPN/GRE traffic.
Local Tunnel Address
This field specifies IP address of virtual tunnel interface.
Local Tunnel Netmask
This field specifies the IP netmask address of virtual tunnel. This field is unchangeable,
always 255.255.255.252
Tunnel Source
This field specifies IP address or hostname of tunnel source.
Tunnel Destination
This field specifies IP address or hostname of tunnel destination.
Interface
This field specifies GRE interface. This field gets from the GWR-HS Router.
KeepAlive Enable
Check for keepalive enable.
Period
Defines the time interval (in seconds) between transmitted keepalive packets. Enter a
number from 3 to 60 seconds.
Retries
Defines the number of times retry after failed keepalives before determining that the
tunnel endpoint is down. Enter a number from 1 to 10 times.
Add
Click
Add
to insert (add) new item in table to the GWR-HS Router.
Remove
Click
Remove
to delete selected item from table.
Summary of Contents for GWR High Speed Router Series
Page 1: ...GWR High Speed Cellular Router Series User Manual version 1 1 Date June 2014...
Page 26: ...User Manual Geneko GWR High Speed Router Series 26 Figure 17 DHCP Server configuration page...
Page 61: ...User Manual Geneko GWR High Speed Router Series 61 Figure 38 Modbus gateway configuration page...
