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[tor-bugs] #11741 [Tor]: Cannot resolve DNS hostname with many records
#11741: Cannot resolve DNS hostname with many records
--------------------------------+-------------------------------
Reporter: T(A)ILS developers | Owner:
Type: defect | Status: new
Priority: normal | Milestone:
Component: Tor | Version: Tor: 0.2.4.21
Keywords: | Actual Points:
Parent ID: | Points:
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Hi,
today, the hostname used for the Tails mirrors pool (dl.amnesia.boum.org)
has 31 A records.
It can be successfully resolved using non-Tor resolvers, but the Tor
resolver fails to return anything useful.
{{{
$ tor-resolve dl.amnesia.boum.org
May 05 10:15:34.891 [warn] Got SOCKS5 status response '4': host is
unreachable
zsh: exit 1 tor-resolve dl.amnesia.boum.org
}}}
... and TBB times out with "Firefox can't establish a connection to the
server at dl.amnesia.boum.org." when trying to connect to
http://dl.amnesia.boum.org/. Note that ttdnsd works fine.
I suspect that's because we have reached the point when the DNS reply
needed to answer the request exceeds the default maximum size of a UDP
datagram (512 bytes). Perhaps the Tor DNS resolver fails to fallback to
TCP, or to specify/handle larger UDP datagrams with the EDNS extension?
As a temporary workaround, I'll drop a few mirrors from our DNS round-
robin pool, but given how quickly the amount of Tails downloads grows
these days, it would be good for us to see our mirrors pool grow
accordingly (which does happen, until this point). I'll report back to
confirm if this workaround does the job.
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/11741>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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