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Two NB1600 connected through a GRE tunnel over the mobile interface.

TAP mode: gre_tap.pdf

Configure of Box1 TAP mode:

config.version=1.8
config.product=1600
network.hostname=NB1600
cert.settings.phrase=[enc]
wwan.0.status=1
wwan.0.card=0
wwan.0.sim=0
wwan.0.number=*99*
wwan.0.username=testprofil
wwan.0.password=[enc]
wwan.0.apn=corporate.swisscom.ch
wwan.0.auth=3
wwan.0.hdrcomp=0
wwan.0.softcomp=0
wwan.0.isdn=0
usb.status=0
usb.0.enabled=0
usb.1.enabled=0
autorun.status=0
cliphp.status=0
network.lan.1.address=192.168.4.1
network.dhcp.0.end=192.168.1.120
network.dhcp.1.start=192.168.4.100
network.dhcp.1.end=192.168.4.199
wanlink.0.mode=1
wanlink.0.name=wwan0
wanlink.0.prio=1
wanlink.0.weight=0
gre.status=1
gre.tunnel.0.mode=1
gre.tunnel.0.type=tap
gre.tunnel.0.peer=138.188.50.3
gre.tunnel.0.brdev=lan0
admin.password=[enc]
ssh.port=22
telnet.port=23

Configure of Box2: