[tor-relays] Filtering TOR Non-exit Relay - Just Curious

[Nelson]

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Hello!

Konrad, initially and completely unrelated to Tor, I was working on
adding some blocklists to my firewall when I came upon and old
program, Peerblock. Peerblock from what I remember can log all allowed
and blocked traffic, and gives one the ability to use already made
blocklists or create new ones. Peerblock has some interesting
blocklists and I thought maybe I could use some of those blocklists or
some of the listed IP's to filter warez, P2P and other undesirable sites.

Tor (middle) Relays don't have the filtering options like Exit Relays.
With Exit Relays one can choose the type of traffic based on personal
and legal reasons, then I thought why don't middle relays at least
have some mechanism to block undesirable traffic?

So I installed Peerblock on one of my Windows PC's that has a Tor
Relay (HelloChilli). Initially Peerblock was set to allow all traffic
and to my surprise I could see what seemed to be Tor traffic being
logged. Then I activated some blocklists and sure enough I was
apparently able to block traffic from undesirable sources. Further, I
can right click, copy to clipboard the ip addresses of the blocked
ip's, do an NSLOOKUP  and generally discern whether the ip address is
from a listed Tor relay, a VPN service, from Anti-P2P, Gov or other
sources.

My initial curiosity about viewing real-time Tor traffic and the
ability to block specific traffic on my middle-node seemed to be achieved.

- --Nelson
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