<para>Labels are only composed by letters ([A-Za-z]), digits ([0-9]) or dashes ('-') (not starting or ending with), and should be less than 63 characters; domain name (labels separated by '.') should be less than 255 characters. See also [ref]: IETF RFC1912 (2.1 Inconsistent, Missing, or Bad Data).</para>
44
<para>Labels are only composed by letters ([A-Za-z]), digits
45
([0-9]) or dashes ('-') (not starting or ending with), and
46
should be less or equal than 63 characters; domain name
47
(labels separated by '.') should be less or equal than 255 characters. See also [ref]: IETF RFC1912 (2.1 Inconsistent, Missing, or Bad Data).</para>
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</src>
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</explanation>
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51
<explanation name="rfc2182">
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<src type="adv" from="zonecheck">
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53
<title>ZoneCheck</title>
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<para>To avoid loosing all connectivity with the authoritative DNS
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<para>To avoid losing all connectivity with the authoritative DNS
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in case of network outage it is advised to host the DNS on
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different networks.</para>
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</src>
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<explanation>
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<src type="adv" from="zonecheck">
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<title>ZoneCheck</title>
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<para>To avoid loosing all connectivity with the authoritative DNS
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<para>To avoid losing all connectivity with the authoritative DNS
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153
in case of a routing problem inside your Autonomous System,
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it is advised to host the DNS on different AS.</para>