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I have Toshiba notebook with embedded wifi adapter 2.4Ghz, desktop without embedded wifi adapter and Samsung Galaxy smartphone with Mobile HotSpot feature also on 2.4Ghz. Smartphone is connected to Internet through mobile operator. I need provide internet access for notebook and desktop through smartphone and combine them in network, so I will be able to ping notebook from desktop and vice versa.

I have bought TP-Link Archer T1U usb wifi adapter for my desktop and found that it supports only 5Ghz bandwidth. Yeah.. shit happens. But also I have old rooted Samsung Galaxy SM-T211 tablet with USB Tethering feature. So I switch on Mobile HotSpot on smartphone and connect notebook to smartphone through wifi. Then I connect tablet to smartphone also through wifi. Finally I switch on USB Tethering feature on tablet and connect desktop to it through usb cable. Network schema is shown below. enter image description here All devices have internet access. Seems good, except I can't ping desktop(192.168.42.56) from notebook(192.168.43.24).

Forgot to mention, I use ArchLinux on both desktop and notebook.

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    There's is a similar question and I was thinking about answering that for quite some time. It's good that you have come up with a well explained solution. I suggest you move the answer part from this question to an answer to that question, and leave only the question part here (it's a Q/A site). – Irfan Latif Jan 2 at 18:43
  • yeah, it has sense. What if I divide Q and A parts here and post link to this question in thread you mentioned? – Kirill Bugaev Jan 2 at 18:58
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    duplicate questions are discouraged and highly likely to be closed. So better answer to previously existing question. – Irfan Latif Jan 2 at 19:00
  • @Irfan Latif, ok, thanks – Kirill Bugaev Jan 2 at 19:02
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I have found the solution.

First, I add routing for 192.168.52.0/24 net via 192.168.53.224(tablet) on notebook:

$ sudo ip route add 192.168.42.0/24 via 192.168.43.224 dev wlp5s0

Second, flush all the chains in ip table on tablet through Android Terminal Emulator. Tablet is rooted, so it is not a big problem:

$ su
# iptables -F

That is all. Now notebook can ping desktop and vice versa.

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