105
Predefined user roles
network-admin
Parameters
peer
: Allows time requests and NTP control queries (such as alarms, authentication status, and time
server information) from a peer device 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 from a peer device, but does not allow the
local device to synchronize itself to a peer device.
synchronization
: Allows only time requests from a peer device.
aclacl-number
: Specifies an ACL. The peer devicesthatmatch the ACL have the access right
specified in the command. The
acl-number
argument represents a basic ACL number in the range of
2000 to 2999.
Usage guidelines
You can control NTP access by using 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 an access right, the associated access right is not granted.
•
If no ACL is created for any access right,
peer
is granted.
The
ntp-service acl
command provides minimal security for a system running NTP. A more secure
method is NTP authentication.
Examples
# Configure the peerdevices on subnet 10.10.0.0/16 to have full access to the local device.
<Sysname> system-view
[Sysname] acl basic 2001
[Sysname-acl-ipv4-basic-2001] rule permit source 10.10.0.0 0.0.255.255
[Sysname-acl-ipv4-basic-2001] quit
[Sysname] ntp-service peer acl 2001
Related commands
ntp-service authentication enable
ntp-service authentication-keyid
ntp-service reliable authentication-keyid