Hi,
i have got MikroTik RB751U-2hND and 3G modem Huawei K2540. In RouterOS, I have set modem - APN, PIN, Phone. In RouterOS is written : Connected. I set route - out : modem. I set wireless SSID, password.. But when I try go to Google, it doesn’t work. In RouterOS Terminal pings Google without problem, so in Router Internet works. But on WiFi it doesn’t work.
I need solve it asap, help me please.
Sorry for my english.
Hi MadaraCZech,
It’s not clear if you tried to ping google from the pc or from the Mikrotik.
if from the Mikrotik board it doesn’t work then:
#1: check if the default route (0.0.0.0/0) is present
#2: ping 8.8.8.8 if works go to step #4 if not go to next step
#3: Check nat configuration on the Mikrotik
#4: ping www.google.com, if works check internet connection from PC, if it doesn’t work go to next step
#5: check dns configuration on the mikrotik
If from PC is not working follow next checks in order:
#1: ping 8.8.8.8 if works go to step #3 if not go to next step
#2: Check nat configuration on the Mikrotik
#3: ping www.google.com, if works internet connection is ok, if it doesn’t work go to next step
#4: Check dns configuration on the PC
Do you set NAT to masquerade? What is your OUT interface? Do you have set DHCP Client?
Follow this instructions (use Google Translate 
) and will set your modem. This tutorial is for Android tethering, but the same is for 3G/4G modem.
I agree with deanMKD1; sounds like you’re missing Masquerade on the out interface. Post your config for better help.
Thank for help,
I had to create network for eth and wifi, it works now.