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Alex YoungFlag for United Kingdom of Great Britain and Northern Ireland asked on

3G Dongle Internet

We have a client who has no internet at the moment, we have a 3G dongle what is the best way to get at least email flow restored over a 3G Dongle??

This is only a temp solution so not ideal but any ideas would be appreciated.
Windows NetworkingExchangeWindows Server 2008

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8/22/2022 - Mon
Alex Young

sbs 2008 as well
Simon Butler (Sembee)

You will be able to get outbound email over the 3G connection, but it is unlikely you will get inbound. Most of the 3G data services do not provide a static routable IP address.
Therefore you will need to route the email to another server that you can VPN in to to collect the email. I do this with my clients for this exact scenario. I have a server on the internet running IIS SMTP. Email is delivered to that server, the actual server VPNs to my server and email goes over the VPN.


You can also buy a DynDNS Pro account to point dynamic IPs to the same domain.  Most routers support updating DDNS accounts whenever the IP changes. Speaking of routers, if your dongle is listed on the Modem and Accessory Info tab on the Cradlepoint MBR95's page, you won't have to install any software on the server to use the dongle for access. Those are about $120 USD on Amazon.
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William Peck
Simon Butler (Sembee)

If you are getting a 10.x.x.x address, which is what most of the 3g data connections seem to provide, a dynamic DNS account isn't going to work. It isn't the IP address being dynamic that is the issue, it is the fact that it isn't routable.


They're usually dynamic, not private.
e.g. right now my 3G connection has
In a minute I'll reboot my cradlepoint and get a different IP.  :-)
Simon Butler (Sembee)

That is unusual. In my experience most of the mobile providers are issuing non-routable. My Android is currently on with a subnet of!

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Alex Young

Ill see what I get tomorrow does it have to be a pro account
Simon Butler (Sembee)

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Alex Young

To get it working am i just plugging the dongle in and then set a new default gateway?
Simon Butler (Sembee)

You probably don't even have to do that.
Windows should do that for you once you have made the connection. It will be a DHCP client in effect.

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James Murphy

DynDNS doesn't offer free accounts anymore, and the free ones that grandfathered in have to logon every 30 days or the account is closed.
$25/year gives you up to 30 different host names from 260+ domains (their old free accounts were limited to 2 host names from about 3 domains).
See http://dyn.com/dns/ for their menu of offerings.

http://www.noip.com still offers a free DDNS account, as does http://freedns.afraid.org/

Here's a site that has a list of free DDNS providers: