DOC 6501_Release V
ATS-6501 Users Guide
70
3.4.4 File Transfer Protocol (FTP)
Allows users to:
•
Obtain the FTP log files and the RINEX files. The gps log files are available in the ftp
user’s home directory and the rinex files are available in the rinex subdirectory. User
name and password = ftp. The ftp user has read and write access for the GPS log files
and the ftp user can delete the GPS log files as needed. The ftp user can get to the
RINEX files using the change directory command (
cd rinex)
and has read permissions but
is unable delete the files in the rinex subdirectory.
•
Upload a new software version (.iso) and use the
software_update
command to update
the system software. User name and password = update.
•
Manage the bitcode files. User name and password = bitcode.
•
Manage the systems mibs files (See section 3.4.6.)
3.4.5 Network Time Protocol (NTP)
Network Time Protocol (NTP) is provided for the dissemination of time to other devices on the
network. The NTP structure classifies devices based upon levels referred to as stratums.
Stratum-1 indicates a clock that is obtaining time from a reference clock. The ATS-6501 NTP
server is a stratum 1 server. To check the status of the internal NTP Server telnet into port 1700
and use the
status reference:ntp
command. locked = true indicates the system is providing
accurate time, false indicates it is not. The source should indicate that it is using the internal
reference clock. The ATS-6501 is capable of supporting ~100 NTP Clients.
ATS-6501>status reference:ntp
[locked] true
[source] internal refclock
[OK] 2013-08-07T20:38:40Z
3.4.5.1 NTP Authentication
This ATS-6501 supports NTPv4 authentication using a shared key. It also supports NTP Auto
Key authentication but its use is not recommended due to known security vulnerabilities in the
auto key mechanism.
To set up the authentication a keyfile must be placed on both the NTP client and NTP server
(ATS-6501). To generate a random
ntp.keys
file:
•
Navigate to directory to store the ntp key:
cd /etc/ntp
•
Run the key generator:
ntp-keygen –M
This generates a file with the key and then links that file to the ntp.keys file.
lrwxr-xr-x 1 root tsc 33 Oct 6 19:37 ntp.keys -> ntpkey_MD5key_(hostname).3684771467
-rw-r----- 1 root tsc 1064 Oct 6 19:37 ntpkey_MD5key_(hostname).3684771467
The example ntp.keys file below shows a typical symmetric keys file. Each line of the file
contains three fields, first an integer between 1 and 65534, inclusive, representing the key