#18605: Consider including fallback directory mirrors with multiple IP addresses
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Reporter: teor | Owner: teor
Type: enhancement | Status: new
Priority: Medium | Milestone: Tor: unspecified
Component: Core Tor/Tor | Version:
Severity: Normal | Resolution:
Keywords: | Actual Points:
Parent ID: | Points: 3
Reviewer: | Sponsor:
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Comment (by teor):
Replying to [comment:7 nickm]:
> Here's a silly question: Can we just include the fallback twice, with
two different addresses?
Yes, it's the fallback selection process that needs changes, not tor
itself:
Replying to [ticket:18605 teor]:
> ...
> This will require changes to the fallback selection script and the
whitelist format.
And it's safe (for reliability) to list the same fallback twice, as long
as it's only some fallbacks that get this treatment. Ideally, we'd want
users to get at least 1 fallback or authority on an alternate IP address
before it fails bootstrap or the user gives up (nominally 30 seconds).
Authority: 2*2/8 = 50%
Fallback: 4*N/150 = 50%
With N = 19, or 1/8 of fallbacks on alternate IP addresses, most clients
would get at least one on an alternate address every bootstrap.
The challenge will be contacting each operator, and finding some operators
with multiple IP addresses. We might even contact all *potential*
operators, and then select two different lists, so we don't miss eligible
relays with multiple IP addresses.
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18605#comment:8>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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