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| -rw-r--r-- | plugin/bind/README.md | 20 |
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diff --git a/plugin/bind/README.md b/plugin/bind/README.md index fec5511ab..761aa056a 100644 --- a/plugin/bind/README.md +++ b/plugin/bind/README.md @@ -49,3 +49,23 @@ The following sample is equivalent to the preceding: bind ::1 } ~~~ + +## Bugs + +When defining more than one server block, take care not to bind more than one server to the same +address and port. Doing so will result in unpredictable behavior (requests may be randomly +served by either server). Keep in mind that *without* the *bind* plugin, a server will bind to all +interfaces, and this will collide with another server if it's using *bind* to listen to an interface +on the same port. For example, the following creates two servers that both listen on 127.0.0.1:53, +which would result in unpredictable behavior for queries in `a.bad.example.com`: + +``` +a.bad.example.com { + bind 127.0.0.1 + forward . 1.2.3.4 +} + +bad.example.com { + forward . 5.6.7.8 +} +```
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