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