3. Time Synchronization
ROX™ v2.2 User Guide 65 RuggedBackbone™ RX5000
Figure 3.7. Server Restrictions Key settings form
Address
Synopsis: IPv4 address in dotted-decimal notation
Synopsis: IPv6 address in colon-separated hexadecimal notation
Synopsis: Domain name (RFC 1034)
Synopsis: string - the keyword { default }
Address to match. The address can be host or network IP address or a valid host DNS name.
Mask
Synopsis: IPv4 address in dotted-decimal notation
Synopsis: string - the keyword { default }
Mask used to address match. Mask 255.255.255.255 means address is treated as the address
of an individual host.
• On the Server Restrictions form, set the restriction parameters.
• Commit the changes.
Figure 3.8. Server Restrictions form
Flags
Synopsis: string - one of the following keywords { version, ntpport, notrust, notrap, noserve,
noquery, nopeer, nomodify, lowpriotrap, limited, kod, ignore }
Synopsis: "flags" occurs in an array.
Flags restrict access to NTP services. An entry with no flags allows free access to the NTP server.
• version: denies packets that do not match the current NTP version.
• ntpport: matches only if the source port in the packet is the standard NTP UDP port (123).
• notrust: denies service unless the packet is cryptographically authenticated.
• notrap: declines to to provide mode 6 control message trap service to matching hosts.
• noserve: denies all packets except ntpq(8) and ntpdc(8) queries.
• noquery: denies ntpq(8) and ntpdc(8) queries.
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