112
synchronization
: Allows only time requests from a system whose address passes the access list
criteria.
ipv6-acl-number
: Specifies an ACL. The peer devices that match the ACL have the access right
specified in the command. The
ipv6-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 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 ipv6acl
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 basic 2001
[Sysname-acl-ipv6-basic-2001] rule permit source 2001::1 64
[Sysname-acl-ipv6-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 ipv6 dscp
Use
ntp-serveripv6 dscp
to seta DSCP value forIPv6 NTP packets.
Use
undo ntp-serveripv6 dscp
to restore the default.
Syntax
ntp-service ipv6 dscp dscp-value
undo ntp-service ipv6 dscp