[AusNOG] Ethernet + 4G router recommendations

[Ken Wilson]

You can do bridge mode if you’ve got a linux device terminating the 4G connection.
The basic method is to get the connection up, strip the IP address off the 4G connection, and provide it to a host down stream via DHCP.
Set a default gateway out the 4G modem - (if its an CDC-ethernet 4G modem as most are, you’ll have a gateway assigned you can use), set up a static route to the 4G IP address via the ethernet adapter connected to the downstream host, and enable proxyarp on that ethernet adapter.


On 5 Nov 2014, at 8:30 am, Bruce Forster <bruce at tubes.net.au> wrote:

> Not sure about bridge mode... however with the l2tp + ppp / ipsec you dont have double nat the tunnel does pass over the nat from the TP-Link device but all other traffic is inside the tunnel...
> 
> 
> 
> 
> On Wed, Nov 5, 2014 at 7:53 AM, Karl Auer <kauer at biplane.com.au> wrote:
> On Wed, 2014-11-05 at 07:28 +1000, Bruce Forster wrote:
> > If you are really pressed for cash... you can get one of these:
> > http://www.computeralliance.com.au/tp-link-tl-mr3020-portable-wireless-n-150mbps-router/3g-support
> 
> Ignorant question: Can something like that be used in bridge mode, as
> one might with an ADSL modem? Or is 3G/4G handled differently?
> 
> This device seems to do bridge mode over 3G:
> 
>    http://www.wificamit.com/super-modem-33.html
> 
> For the OP's requirement, something like that (or the TP-Link) in bridge
> mode might be nicer than managing a dongle or built-in 3G/4G. Also
> avoids double NATting.
> 
> Regards, K.
> 
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> 
> -- 
> Regards,
> 
> Bruce
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