Hongdian H7921/H7920 Basic 3G/4G Router - Manual (Page 117)

H92x 3G/4G Router 7 FAQ
Version (2014-05-28) 7 -83
L2TP used to build a virtual private network, after H792x 3G/4G Router connect to company
NAS server, PC under H792x could visit company network like visiting the local area network.
Let us check a setting example:
Figure 6-81 Build IPSec
PC1 connect H792x then build IPSEC link by VPN function of H792x with company router. I
assume using IPSec tunnel mode, H792x end local network 192.168.86.1/24, company server
end 192.168.99.1/24, by IPSEC, two LAN could communicate.