user92505: For the following setup:
         A   ----(HIGH Fee rate) ----  B  ----------------  C

B want to charge A for more fee, he raises the fee of the channel between AB

A pays to C
A pays to B
C pays to A

Does high fee rate only affects case 1 only??

user91626: No, only the third case is affected. And the reason for that is that channels are actually bi-directional and have two fee policies depending on the direction they are used.
For example, channel AB has a policy from node A, and a policy from node B. If B increases the fee - it will only affect the payments going from B to A, not the other way around.
That means that scenario 2 in your case is always controlled only by node A. Scenario 3 includes the payment from B to A, so fees will be higher. Scenario 1 can also be affected by node B, but it will need to increase fees on the channel BC, not AB.

92505: <p>For the following setup:</p>

<pre><code>         A   ----(HIGH Fee rate) ----  B  ----------------  C
</code></pre>

<p>B want to charge A for more fee, he raises the fee of the channel between AB</p>

<ol>
<li>A pays to C</li>
<li>A pays to B</li>
<li>C pays to A</li>
</ol>

<p>Does high fee rate only affects case 1 only??</p>
 91626: <p>No, only the third case is affected. And the reason for that is that channels are actually bi-directional and have two fee policies depending on the direction they are used.</p>

<p>For example, channel AB has a policy from node A, and a policy from node B. If B increases the fee - it will only affect the payments going from B to A, not the other way around.</p>

<p>That means that scenario 2 in your case is always controlled only by node A. Scenario 3 includes the payment from B to A, so fees will be higher. Scenario 1 can also be affected by node B, but it will need to increase fees on the channel BC, not AB.</p>
