Model: MTS200 (1U)
Doc. Ref. no. : - m08/om/201
Issue no.: 03
Page 125 of 195
User’s Manual
Figure 11-5 NTP Security Setings on Webserver
2. Now, to configure any key in ntp.keys file as trustedkey in ntp.conf file, go to menu NTP-> NTP
Configurations.
If trusted key field is to be modified, then user have to ensure the NTP filed “Authentication Type” should
be already set as “SYMMETRIC”. If not, set it as “SYMMETRIC” and then apply “SAVE” button. Then only
user can modify trusted key as explained below.
Now, Enter the required trustedkey value in field “Trusted Key” and then click on “ADD” button. If user
wants to remove any key as
trusted key, enter the required trustedkey value in field “Trusted Key”
and then click on “DEL” button.
After doing above changes, user have to restart the ntp service in order to new trusted key to be in effect.
11.3.3.4.2 NTP AutoKey Mechanism:
NTPv4 included support for NTP symmetric key as well as NTP Autokey mechanism specified in RFC-
5606. NTP Symmetric key was less secure than NTP Autokey due to easy access to password form
ntp.keys file. However, Autokey mechanism provided more robust mode of authentication between ntp
server and clients by generating private key, public key and group key. Also, ntp Autokey reduce the extra
work of changing the key in all ntp clients whenever there is change in private key at trusted server.
