[issue18805] ipaddress netmask/hostmask parsing bugs

[Eric V. Smith]

Eric V. Smith added the comment:

I haven't had time to review this yet, but at least several of these, if true, are definitely bugs that should be backported. "254.192.128.0" as a netmask? Descending octets as the condition? Yikes.

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nosy: +eric.smith
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18805>
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