CTEK Z4200U SkyRouter - Manual (Page 35)

26 October 2012
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Remote Tunnel IP – The address used to construct the remote end of the GRE tunnel
Local Tunnel IP - The address used to construct the local end of the GRE tunnel
Net Mask (next to Local Tunnel IP) – The mask limiting the range of addresses connecting to the local tunnel
Figure 24 - A GRE Tunnel