On 22.08.2017 13:44, Colin Fee wrote:
Hi Lindsay,
I've re-read your original and drawn out what I think your set-up is
(or was). A couple of questions that may help formulate an answer.
What model is your D-Link 4G modem/router?
Dlink DWR-921
Which device is providing DHCP for you other devices?
The network has no DHCP service, each machine has the same hosts file
which has all
my machines in it. I did it this way as I general use only a single
machine, the network
providing a simple way to exchange data, so there is no machine that is
on all the time
any machine is running.
Which device (presumably the D-Link) is providing a NAT service?
I have 5 machines all connected to a switch, one of these machines has
an external
connection, I have a firewall set upon this machine it as well provides
the NAT service.
I also have a caching name server (pdnsd) running, the resolv.conf of
all machines point
to this mmachine, pdnsd providing name service for anything not in the
hosts file.
What I would LIKE to do is replace the old 2G mobile external connection
via a
USB port with an 4G modem router confidured as straight through (Note:
this is
what a would LIKE, ie its not cast in stone) via a second ethernet port
(ie no
firewall or NAT, the Dlink can do this)
Sadly I have not been able to get any response at all from the DLink as
it
(apparently) indicates the LAN conncetion to my switch is not
functioning although
tests I have done indicate it should be OK.
Note: After yesterdays testing when my existing internet connection via
a
windows machine stopped working after swapping my sim between my USB 4G
modem
and the DLink and back I am getting some what "gun shy" of swapping the
sim
back and forth and I am considering getting a 4G router that uses a USB
4G modem
for 4G access. I HAVE had trouble in the past from swapping sims between
devices.
The mobile network apparently does NOT like you doing this, swapping the
usb modems
though is not an issue.
Note 2: I have ordered a router that uses a USB dongle for mobile
broadband access.
Lindsay
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