I simply enabled DHCP while I was with both my miner and pc connected through the router (intelbras GWM 1420N).
These are the steps done:
1. Type 192.168.1.99 (or whatever is your miner ip);
2. Before going to the step three, check if your miner pool is correctly set;
3. In networks go to WAN, by clicking in "edit";
4. Switch from static ip to dhcp - note that this was in the manual or FAQ, I don't remember (dooh!);
5. Wait until a green led starts to flash outside the miner and a growing noise start to appear
![Cool](https://bitcointalk.org/Smileys/default/cool.gif)
Note that after you've done the step 4, you may be unable to access the miner, though it's mining already. Maybe you will still be able to access the miner, but that is not my case - my connection sucks, remember?
Ah, and my ISP didn't ask for login credentials. It asks only one time. After logging through browser, it won't ask again. My bad, sorry.
Thanks everyone!
![Cheesy](https://bitcointalk.org/Smileys/default/cheesy.gif)