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GRE slow in one direction

Hi folks

I need some help understanding a problem I have. I have to networks connected over GRE using Cisco 1921 routers. One router is connected to the Internet and the other one to a 4G provider. 4G as I know it should be slower on the upload than on the download but for my users at the remote site it's the opposite. I get speeds around 4mbit down and 12mbit up. If I send the remote site straight out to Internet and skip the tunnel I get speeds around 10mbit down and 5mbit up.

I've been trying some MTU and MSS settings but none has given any clear improvements. Anyone got an idea?

Regards

Fredrik

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