problem when trying to intercept traffic in localhost

[Lavc-31]

Hi, I have a problem when trying to intercept traffic in localhost, I have created a function but it seems that it doesn't run or do anything for several minutes (that's why I used "ctrl + c" at the end). Maybe there is some mistake in the function logic? Could it be something else?

Using ping, as explained in the wiki I had no problems at all. Thank you in advance for your help.