Thanks for the pointers everyone. There seem to be a number of factors at play here: 1) Most of the LTE USB modems you can purchase have some kind of "router on a stick" built in which provides a firewalled, DHCP assigned private IP on the LAN side in the normal ranges of 192.168.x.x or 10.x.x.x. In Huawei's case this is known as "HiLink mode". 2) In addition to this, depending on which provider they are bought from, these modems / dongles are flashed with an ISP-specific firmware which further locks down the device to stop certain features being exposed to the device's web-interface. This makes it tricky to change things such as the APN settings. 3) The above types of device (i've been mainly concerned with the Huawei E3372 since that's the one my router has support for) can apparently be re-flashed with custom firmware which allows HiLink mode to be switched off (see here: http://www.0xf8.org/2017/01/flashing-a-huawei-e3372h-4g-lte-stick-from-hilin...) this will apparently allow the "public" IP to be assigned directly to the device connected to the USB port and avoids the pesky double NAT situation. 4) The reason I say "public" in quotes above is because even if you manage to pass this address through, quite often the address itself is not a true public IP as it is behind carrier NAT and you are back to square 1. For those interested, here are the options I'm exploring: 1) Getting a sierra 320U unlocked from ebay which can be used in "stick mode" without NAT or DHCP enabled and purchasing a SIM plan from either M2MOne or URL networks which has a "true" public IP (with all the public health and DDOS warnings this entails!) 2) Buying an LTE router such as: Dovado Tiny MikroTik SXT LTE Netgear (I know!) LB1111 TP-Link MR6400 and then using the same sim card as above. From the research I've done, these devices have a "passthrough" or bridge mode which will present the LTE public IP directly to my main router, albeit via an RJ45 / ethernet connection. Ben *BEN JACKSON* Director *M *0404 924745 *E* ben@elogik.com.au *W* elogik.com.au <http://www.elogik.com.au/> <http://www.elogik.com.au> On Wed, Nov 22, 2017 at 6:15 PM, Jason Hecker (Up & Running Tech) < jason@upandrunningtech.com.au> wrote:
Oh I see, OK, sounds like you need something that will do a PPP session which some 4G cards will let you do if you put them into serial mode like the Telit LE910 (which I have tried) or the Sierra modules.
If you end up with a static or dynamic public IP you can cname the dynamic DNS Mikrotik provides in the router's ip->cloud settings and set the timeout to 60, so you could get at it like bighonchoclient1.elogik.net for example.
I kicked the idea around but never tried buying a cheap VPS with a static IP and having the 4G based Mikrotik VPN into it, then on the VPS port forward any ports to services behind the 4G device.
On 22 November 2017 at 15:59, Ben Jackson - ELOGIK <ben@elogik.net> wrote:
Hi Jason,
OK, I didn't phrase my question very well, what I need is a dongle or card that doesn't provide an extra layer of NAT (as many do) and run an internal DHCP sever so that the routers cellular interface ends up with an IP address like 192.168.x.x but instead passes the public IP directly. This is so I don't end up with a double NAT situation (kind of the equivalent of bridge mode for a DSL modem) and I can access resources (like security systems etc) behind the public IP by configuring the main firewall / router accordingly.
Ben
*BEN JACKSON* Director
*M *0404 924745 *E* ben@elogik.com.au *W* elogik.com.au <http://www.elogik.com.au/> <http://www.elogik.com.au>
On Wed, Nov 22, 2017 at 2:24 PM, Jason Hecker (Up & Running Tech) < jason@upandrunningtech.com.au> wrote:
What if you had those routers phone home to a VPN server in your office over 4G? They'd always be in easy reach on private subnet on your LAN and you wouldn't need to worry about public or static IPs for your 4G widget.
I noticed Duxtel configured devices I have bought have a PPTP client set up so if you activate it then Duxtel can peer into the device and assist with any issues.
On 22 November 2017 at 13:46, Ben Jackson - ELOGIK <ben@elogik.net> wrote:
Does anyone have any advice on a) a decent 4g service that provides a publicly accessible IP address that ports can be forwarded through as well as how to get hold of an unlocked USB dongle which will support the SIM / service?
Or even a provider that provides this on one of their business plans?
If it can be a prepaid plan even better.
I'm looking to use said device as 4G failover on a meraki mx64 security appliance and calling the usual suspects (Optus, telstra) is giving me a headache.
Any advice on what others have done in this scenario would be most appreciated.
Best regards,
Ben Jackson eLogik
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