[tor-relays] About relay size

[grarpamp]

On Mon, Oct 2, 2017 at 3:53 AM, Santiago <santiagorr at riseup.net> wrote:
>> And you can only have 2 tor instances per public IPv4 address.
>
> Why? Is there any place where I can find this kind of info?

Read the archives of this list linked at the bottom of every message.
As an operator you'll find lots more interesting subjects there too.

> Maybe it's another issue, but I have recently tried to run a second
> relay behind the same IPv4 address than my first relay, and the
> connection quality strongly diminished. I suppose my ISP equipment was
> not able to handle the two relays on NAT, but I would need to
> investigate further.

Lots of hardware for use in the home, whether ISP provided or bought
from wherever by the user, has been known to fall over under load,
cable / dsl / fiber modems, whether in bridge or router modes, wifi, etc.

For tor you need to test with tens to hundreds of TCP connections
or more in parallel. The simple online "speedtests" don't do that.
One way is to load up increasing numbers of opensource Unix iso's,
conference videos, whatever... into whatever torrent client and watch
the stats. If upon passing the expected / required number of connections,
it starts falling significantly off the maximum recorded speed, never recovers
when unloaded, locks up, reboots, melts / smokes / combusts, etc...
then try another brand.

Or instead of router mode, try bridge mode feeding into any old pc running
[Free]BSD / Linux to do the functions of routing, wifi, firewall, nat,
dhcp, dns,
etc... this may often perform better and give more flexibility.