Bridge 3g usb modem PPP connection

RouterOS General
1

Hi!

Anyone know if it’s possible to bridge the PPP 3G connection with the Ethernet interface.

This way the RB411U would act as a bridge and an other RB1200 router would get the public ip.
I tried to add the bridge in “PPP/Profiles”, but it doesn’t work.

This way the 411U would be just as bridge a regualar ADSL modem

Other routers like Dovado Tiny or Huawei has has bridge function built in.

RGDS
Jorgen

2

Not easily. The routerboard will get the IP address because it is the device that is connecting.

But, you can port forward everything through to a private ip address.

There are some more (advanced) tricks you can do to give your external device the public IP address AND the routerboard will have the SAME PUBLIC IP address. Quite tricky, but I have read success stories of this. Search around the forum.

3

Thank for your answer!

I solved it with help from http://wiki.mikrotik.com/wiki/Manual:Simple_Static_Routing

RGDS

4

Just to be clear, the Dovado Tiny router can only bridge some modems.
For example, it can not bridge late model Sierra-Wireless ones.

Cheers.

5

Hi jcem,

do you might have your terminal output from your 411u, as I am trying to archieve the same,
but the Link you posted doesn’t describe anything about using it without NAT.

My Setup looks like that I have a CRS-125 setup as Router with 7 Vlans, doing all the Routing and Firewalling.
Now I want to switch from ADSL Internet to 3G Internet, but to get a good Connection I will need to put the 3G Stick offsite using another Mikrotik acting soley as a Bridge between the Router and the 3G Connection.

Everything works great as long as I have a masquerade Rule enabled, but I don’t figure out how to do it without the NAT Feature.

On the 3G-Mikrotik there is a PPP Interface with a Static WAN Ip Address 77.119.XXX.91 , with the Gateway 10.112.112.125 assigned.
Using a seperate internal IP 192.168.124.1/24 I am connected to the CRS Router (192.168.124.2/24) on it’s WAN interface.

What Rules would I have to define in the Routes Table or the NAT Table to make it work without doing any extra NAT on the 3G-Mikrotik?