Ntp-Service Inbound Disable - H3C S5830V2 Series Command Reference Manual

Parameters
peer: Allows time requests and NTP control queries (such as alarms, authentication status, and time
server information) and allows the local device to synchronize itself to a peer device.
query: Allows only NTP control queries from a peer device to the local device.
server: Allows time requests and NTP control queries, but does not allow the local device to synchronize
itself to a peer device.
synchronization: Allows only time requests from a system whose address passes the access list criteria.
acl-number: Specifies an ACL. The peer devices that match the ACL have the access right specified in this
command. The acl-number argument represents a basic ACL number, in the range of 2000 to 2999.
Usage guidelines
You can control IPv6 NTP access by using Access Control List (ACL). The access rights are in the following
order, from least restrictive to most restrictive: peer, server, synchronization, and query.
The device processes an NTP request by following these rules:
• If no NTP access control is configured, peer is granted to the local device and peer devices.
If the IP address of the peer device matches a permit statement in an ACL for more than one access
•
right, the least restrictive access right is granted to the peer device. If a deny statement or no ACL is
matched, no access right is granted.
If no ACL is created for a specific access right, the associated access right is not granted.
•
If no ACL is created for any access right, peer is granted.
•
The ntp-service ipv6 acl command provides a minimum security method. NTP authentication is more
secure.
Examples
# Configure the peer devices on subnet 2001::1 to have full access to the local device.
<Sysname> system-view
[Sysname] acl ipv6 number 2001
[Sysname-acl6-basic-2001] rule permit source 2001::1 64
[Sysname-acl6-basic-2001] quit
[Sysname] ntp-service ipv6 peer acl 2001
Related commands
ntp-service authentication enable
•
• ntp-service authentication-keyid
ntp-service reliable authentication-keyid
•

ntp-service inbound disable

Use the ntp-service ipv6 inbound disable command to disable an interface from receiving IPv6 NTP
messages.
Use the undo ntp-service ipv6 inbound disable command to restore the default.
Syntax
ntp-service ipv6 inbound disable
undo ntp-service ipv6 inbound disable
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