[tor-relays] Advantage in more exits in the same /8?

Jesse Victors jvictors at jessevictors.com
Wed Aug 27 22:12:31 UTC 2014


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On 08/27/2014 04:03 PM, tor-relays-request at lists.torproject.org wrote:
> Not to drift too far off course, but I think you have your masking
> back wards or confused at least.
>
> a /8 is 16M addresses 18.0.0.0/8 for example, so not a small block,
> and a /16 has 64K.
>
> two consecutive /16's say 128.30.0.0/16 and 128.31.0.0/16 make a /15
> (120.30.0.0/15)
>
> the real concern is administrative control not addressing. for exmaple
> both the /8 and /15 mentioned above and some other smaller patches of
> addressing are all on MIT campus and part of the same administrative
> domain in the sense that all traffic passes through a small set of
> routers at some point.  Being a university it doesn't imediately imply
> root access to all servers.  this isn't true of all (or even most)
> /8's, nor does even a /24 with 256 addresses need to be in a single
> geographic or andministrative zone.
>
> -Jon
Thanks Jon,

You're right, I had my ranges weird, even in my title, thanks for the correction. To clarify, because the nodes are physically close to one another, they are in the same /24, namely x.x.x.x - x.x.x.y.
Yes, the real issues is the traffic concentration to a specific set of routers, which is why I'm asking. I'm trying to get a sense of where to draw the line, but from the responses so far it looks like I've got room to spare.

- --
Jesse V.
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