commit eb9ac3b859b95d9a53bc850e79c04698bc5268d4 Author: Isis Lovecruft isis@torproject.org Date: Fri Oct 30 14:38:05 2015 +0000

Add additional comments to prop#188 on bridge reachability self-testing. --- proposals/188-bridge-guards.txt | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+)

diff --git a/proposals/188-bridge-guards.txt b/proposals/188-bridge-guards.txt index 4303937..5d09412 100644 --- a/proposals/188-bridge-guards.txt +++ b/proposals/188-bridge-guards.txt @@ -482,6 +482,24 @@ Status: Accepted entirely, by automatically setting "AssumeReachable 1" for all bridge relays… although I am not sure if this is wise.

+ Our best idea thus far, for bridge reachability self-testing, is to create + a circuit like so: + + Bridge → Guard → Middle → OtherMiddle → Guard → Bridge + + While, clearly, that circuit is just a little bit insane, it must be that + way because we cannot simply do: + + Bridge → Guard → Middle → Guard → Bridge + + because the Middle would refuse to extend back to the previous node + (all ORs follow this rule). Similarly, it would be inane to do: + + Bridge → Guard → Middle → OtherMiddle → Bridge + + because, obviously, that merely shifts the problem to OtherMiddle and + accomplishes nothing. [XXX Is there something smarter we could do? —IL] + 5.2.2. Bridge Reachability Testing by the BridgeAuthority

After receiving Bob's descriptors, the BridgeAuthority attempts to