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explain a bit about router descriptor purposes

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svn:r13154
This commit is contained in:
Roger Dingledine 2008-01-17 05:47:44 +00:00
parent 55e052b0a5
commit 8e601e0ae5
2 changed files with 18 additions and 3 deletions
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4
doc/spec/control-spec.txt
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@ -654,8 +654,8 @@ $Id$
CRLF Descriptor CRLF "." CRLF
This message informs the server about a new descriptor. If Purpose is
specified, it must be either "general" or "controller", else we
return a 552 error.
specified, it must be either "general", "controller", or "bridge",
else we return a 552 error.
If Cache is specified, it must be either "no" or "yes", else we
return a 552 error. If Cache is not specified, Tor will decide for

17
doc/spec/path-spec.txt
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@ -182,7 +182,7 @@ of their choices.
proportional to its advertised bandwidth [the smaller of the 'rate' and
'observed' arguments to the "bandwidth" element in its descriptor]. If a
router's advertised bandwidth is greater than MAX_BELIEVABLE_BANDWIDTH
(10 MB/s), we clip to that value.
(currently 10 MB/s), we clip to that value.
For non-exit positions on "fast" circuits, we pick routers as above, but
we weight the clipped advertised bandwidth of Exit-flagged nodes depending
@ -351,8 +351,23 @@ of their choices.
Tor does not add a guard persistently to the list until the first time we
have connected to it successfully.
6. Router descriptor purposes
There are currently three "purposes" supported for router descriptors:
general, controller, and bridge. Most descriptors are of type general
-- these are the ones listed in the consensus, and the ones fetched
and used in normal cases.
Controller-purpose descriptors are those delivered by the controller
and labelled as such: they will be kept around (and expire like
normal descriptors), and they can be used by the controller in its
CIRCUITEXTEND commands. Otherwise they are ignored by Tor when it
chooses paths.
Bridge-purpose descriptors are for routers that are used as bridges. See
doc/design-paper/blocking.pdf for more design explanation, or proposal
125 for specific details. Currently bridge descriptors are used in place
of normal entry guards, for Tor clients that have UseBridges enabled.
X. Old notes