D-Link DGS-3630-28SC Emulator 1 - Page 1059
Network Time Protocol NTP Commands
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DGS-3630 Layer 3 Stackable Managed Switch CLI Reference Guide 83. Network Time Protocol (NTP) Commands 83-1 ntp access-group This command is used to control the NTP services on the Switch. Use the no form of this command to remove the access control to the NTP services. ntp access-group {default | IP-ADDRESS [IP-MASK] | IPV6-ADDRESS | IPV6-ADDRESS /PREFIX-LENGTH} [ignore] [nomodify] [noquery] [nopeer] [noserve] [notrust] [version] no ntp access-group {default | IP-ADDRESS [IP-MASK] | IPV6-ADDRESS | IPV6-ADDRESS /PREFIXLENGTH} Parameters default IP-ADDRESS IP-MASK IPV6-ADDRESS IPV6-ADDRESS /PREFIXLENGTH ignore nomodify noquery nopeer noserve notrust version Specifies to use the default IPv4 (0.0.0.0/0.0.0.0) or IPv6 (::/::) address. The default IP address is always included with the lowest priority in the list. Specifies a host or network IP address. (Optional) Specifies the mask of the IP address. Specifies a host or network IPv6 address. (Optional) Specifies an IPv6 network. (Optional) Specifies to deny all packets, including NTP control queries. (Optional) Specifies to deny the NTP control queries that attempt to modify the state of the server. (Optional) Specifies to deny all NTP control queries. (Optional) Specifies to deny packets that might mobilize an association unless authenticated. The packets include broadcast, symmetric-active and manycast server packets when a configured association does not exist. Note that this flag does not apply to packets that do not attempt to mobilize an association. (Optional) Specifies to deny all packets except NTP control queries. (Optional) Specifies to deny packets that are not cryptographically authenticated. If the ntp authenticate command is enabled, authentication is required for all packets that might mobilize an association. If the ntp authenticate command is disabled, but the notrust flag is not present, an association can be mobilized no matter it is authenticated or not. If auth is disabled, but the notrust flag is present, authentication is required only for the specified address/mask range. (Optional) Specifies to deny packets that mismatch the current NTP version Default By default, noquery and nomodify is set on the default entry to prevent the Denial of Service vulnerability in the NTP service identified in "NTP.Monlist.Command.DoS". Command Mode Global Configuration Mode. Command Default Level Level: 12. 1054
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