Raise the bandwidth threshold for being a guard
From proposal236:
From dir-spec.txt:
"Guard" -- A router is a possible 'Guard' if its Weighted Fractional
Uptime is at least the median for "familiar" active routers, and if
its bandwidth is at least median or at least 250KB/s.
When this proposal becomes effective, authorities should change the
bandwidth threshold for being a guard node to 2000KB/s instead of
250KB/s.
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