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This page describes a LAN2LAN connection between netmodule router and fritzbox router. This has been tested with Netmodule SW 4.5.0.106 and Fritz!OS: 07.28.

At first, we configure the Fritzbox to accept VPN LAN2LAN connection. Make sure your FritzBox has a static IP or set up DnynamicDNS. In Our example we use DynamiDNS with the hostname: netbox.ddns.net Instructions can be found at AVM https://avm.de/service/wissensdatenbank/dok/FRITZ-Box-7590/30_Dynamic-DNS-in-FRITZ-Box-einrichten/

Internet → Permit Access → VPN: Add VPN Connection

“Connect your home network with another FRITZ!Box network (LAN-LAN linkup)”

VPN Connection
VPN password (pre-shared key) admin01admin01
Name of the VPN connection LAN2LAN
Web address of the remote site* 1.2.3.4
Ipsec Administration
IPsec administrative status enable
Propose NAT traversal checked
Enable IKEv2 Make-before-Break unchecked
Restart on link change checked

Apply new settings. Now the netmodule router should connect to Fritzbox and both should share there networks.

You also can use a config and update your values:

USER
ipsec.status=1 ipsec.0.remote.serverIp=netmodule.ddns.net ipsec.0.ike.psk=[enc]sTs/CogAt7bpw4I76mok6w== ipsec.0.ike.mode=aggressive ipsec.0.ike.hash=sha1 ipsec.0.ike.dh=modp1024 ipsec.0.ike.localId=1.2.3.4 ipsec.0.ike.remoteId=netmdoule.ddns.net ipsec.0.ike.remoteIdType=FQDN ipsec.0.esp.hash=sha1 ipsec.0.esp.pfs=1 ipsec.0.dpd.status=0 ipsec.0.local.0.lanAddress=192.168.1.0 ipsec.0.local.0.lanMask=255.255.255.0 ipsec.0.local.0.natAddress=- ipsec.0.remote.0.lanAddress=192.168.178.0 ipsec.0.remote.0.lanMask=255.255.255.0