In a two-story house with thick brick walls, there is a router on the second floor. Didn't make it to the first floor. Those. The phone caught only in the corridor and very weakly. Actually, I couldn’t put it in a place with a better signal, I put it where there is an outlet. The setup program showed a low signal level there, very low. But, the first floor is now completely covered, the basement too. The only thing that alerted me at first was that it was not a "seamless" network. Those. it seems to create a separate access point. The password is the same, but EXT is added to the name. Well, I just had to connect all the gadgets to this point. Although, it can be configured, but I did not even try.
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