Deny sending and receiving shared media redirects

[raja-grewal]

As per #279 (comment).

Changes

Set sysctl net.ipv4.conf.*.shared_media=0

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[ArrayBolt3]

Seems fine to me, worst-case scenario it makes the network less efficient from my research, and there seems to be a good argument for setting this option.

Edit: Minor nitpick, but there seems to be some extra whitespace (two spaces in a row) in the comments above the actual sysctl option.

[raja-grewal]

Thanks for the review!

I have removed the double space. The other double spaces in the README.md are there to limit line length.

Yes, enabling this sysctl does not appear to have any real strong downsides to me either.

[ArrayBolt3]

@adrelanos Looks good to me, should be merge-ready.