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#76 merge manpage
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man/iodine.8
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man/iodine.8
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@ -27,6 +27,10 @@ iodine, iodined \- tunnel IPv4 over DNS
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.I dnstype
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.B ] [-O
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.I downenc
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.B ] [-L
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.I 0|1
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.B ] [-I
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.I interval
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.B ]
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.B [
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.I nameserver
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@ -70,7 +74,12 @@ iodine, iodined \- tunnel IPv4 over DNS
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lets you tunnel IPv4 data through a DNS
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server. This can be useful in situations where Internet access is firewalled,
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but DNS queries are allowed. It needs a TUN/TAP device to operate. The
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bandwidth is asymmetrical with limited upstream and up to 1 Mbit/s downstream.
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bandwidth is asymmetrical,
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with a measured maximum of 680 kbit/s upstream and 2.3 Mbit/s
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downstream in a wired LAN test network.
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Realistic sustained throughput on a Wifi network using a carrier-grade
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DNS cache has been measured at some 50 kbit/s upstream and over 200 kbit/s
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downstream.
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.B iodine
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is the client application,
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.B iodined
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@ -143,6 +152,26 @@ For TXT queries,
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.I Raw
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will provide maximum performance. This will only work if the nameserver
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path is fully 8-bit-clean for responses that are assumed to be "legible text".
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.TP
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.B -L 0|1
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Lazy-mode switch.
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\-L1 (default): Use lazy mode if server supports it, for improved
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performance and decreased latency.
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Some DNS servers, notably the opendns.com network, appear unstable when
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handling lazy mode DNS traffic and will re-order requests. If this occurs,
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you will notice fluctuating response speed in interactive sessions.
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The iodine client will eventually detect this and switch back to legacy
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mode automatically. Use \-L0 to force running in legacy mode
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(implies \-I1).
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.TP
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.B -I interval
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Maximum interval between requests (pings) so that intermediate DNS
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servers will not time out. Default is 4 in lazy mode, which will work
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fine in almost all cases. Decrease if you get SERVFAIL errors in periods
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without tunneled data traffic. To get absolute minimum DNS traffic,
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increase well above 4 until SERVFAIL errors start to occur.
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Maximum useful value is 59, since iodined will close a client's
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connection after 60 seconds of inactivity.
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.SS Server Options:
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.TP
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.B -c
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