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@@ -12,7 +12,9 @@ private range defined by [RFC 1918](http://tools.ietf.org/html/rfc1918)
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that are not in use on the host machine, and assigns it to `docker0`.
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Docker made the choice `172.17.42.1/16` when I started it a few minutes
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ago, for example — a 16-bit netmask providing 65,534 addresses for the
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-host machine and its containers.
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+host machine and its containers. Mac address is generated from ip to
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+avoid arp collisions and uses a range from 02:42:ac:11:00:00 to
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+02:42:ac:11:ff:ff.
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> **Note:**
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> This document discusses advanced networking configuration
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tangicolin