[tor-relays] is explicit DirPort needed anymore under Tor 0.2.8.6?

Subject: [tor-relays] is explicit DirPort needed anymore under Tor 0.2.8.6?

From: Green Dream <greendream848@xxxxxxxxx>

Date: Tue, 2 Aug 2016 17:13:11 -0700

Delivery-date: Tue, 02 Aug 2016 20:13:26 -0400

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The release notes for Tor 0.2.8.6 have this tidbit about the DirPort:

"Previously only relays that explicitly opened a directory port

(DirPort) accepted directory requests from clients. Now all

relays, with and without a DirPort, accept and serve tunneled

directory requests that they receive through their ORPort. You can

disable this behavior using the new DirCache option. Closes

ticket 12538."

With this new behavior, is there any reason to keep an open DirPort on our relays? If I just use an ORPort on 443 (or another reachable TCP port) is this sufficient? Might it make sense to leave the DirPort up for a while for legacy clients? Will (up-to-date) authorities have any concerns with a ORPort-only relay?

Thanks.

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