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Page 551 / 998 Scroll up to view Page 546 - 550
DNS Client command reference
Domain name system - DNS
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iMG/RG Software Reference Manual (System Administration)
Description
This command adds a server IP address to the server list. This enables you to retrieve a
domain name for a given IP address.
Options
The following table gives the range of values for each that can be specified with this com-
mand and a default value (if applicable).
Example
--> dnsclient add server 192.168.219.196
See also
DNSCLIENT LIST SERVERS
5.2.4.1.3 DNSCLIENT CLEAR SEARCHDOMAINS
Syntax
DNSCLIENT CLEAR SEARCHDOMAINS
Description
This command deletes all domain names from the domain search list.
Example
--> dnsclient clear searchdomains
See also
DNSCLIENT ADD SEARCHDOMAIN
DNSCLIENT DELETE SEARCHDOMAIN
5.2.4.1.4 DNSCLIENT CLEAR SERVERS
Syntax
DNSCLIENT CLEAR SERVERS
Description
This command deletes all the server IP addresses to the server list.
Example
--> dnsclient clear servers
See also
DNSCLIENT ADD SEARCHDOMAIN
DNSCLIENT DELETE SERVER
5.2.4.1.5 DNSCLIENT DELETE SEARCHDOMAIN
Syntax
DNSCLIENT DELETE SEARCHDOMAIN <searchstring>
Description
This command deletes a single domain name from the domain search list.
Options
The following table gives the range of values for each option that can be specified with
this command and a default value (if applicable).
Option
Description
Default Value
ipaddress
The IP address of the server that has an unknown
domain name. You can add a maximum of 3
addresses to the server list, in the format:
192.168.102.3
N/A
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Domain name system - DNS
DNS Client command reference
iMG/RG Software Reference Manual (System Administration)
5-92
Example
--> dnsclient delete searchdomain 1
See also
DNSCLIENT CLEAR SEARCHDOMAINS
DNSCLIENT LIST SEARCHDOMAINS
5.2.4.1.6 DNSCLIENT DELETE SERVER
Syntax
DNSCLIENT DELETE SERVER <number>
Description
This command deletes a single server IP addresses from the server list.
Options
The following table gives the range of values for each option that can be specified with
this command and a default value (if applicable).
Example
--> dnsclient delete server 1
See also
DNSCLIENT CLEAR SERVERS
DNSCLIENT LIST SERVERS
5.2.4.1.7 DNSCLIENT LIST SEARCHDOMAINS
Syntax
DNSCLIENT LIST SEARCHDOMAINS
Description
This command lists the domain search strings that you have added to DNS client using
the
DNSCLIENT ADD SEARCHDOMAIN
command. DNS client uses this list when a
user asks for the IP address list for an incomplete domain name.
Example
--> dnsclient list searchdomains
ID
| Domain
-----|---------------------
Option
Description
Default Value
searchstring
A number that identifies a search string used to find
the IP address for an incomplete domain name. To
list domain search strings, use the
DNSCLIENT
LIST SEARCHDOMAINS
command.
N/A
Option
Description
Default Value
number
The server number that identifies an IP address of
the server that has an unknown domain name. To
display server numbers, use the
DNSCLIENT
LIST SERVERS
command.
N/A
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SNTP features
SNTP
5-93
iMG/RG Software Reference Manual (System Administration)
1 | alliedtelesyn.com
---------------------------
5.2.4.1.8 DNSCLIENT LIST SERVERS
Syntax
DNSCLIENT LIST SERVERS
Description
This command lists the server IP addresses that you have added to DNS client using the
DNSCLIENT ADD SERVER
command. DNS client uses this list to retrieve a domain
name for a given IP address.
Example
--> dnsclient list servers
DNS Client Servers:
ID
| IP Address
----|------------------
1 | 192.168.100.7
2 | 192.168.100.1
------------------------
5.3
SNTP
The SNTP Version 4 client is an OSI Layer 7 application that allows the synchronization of gateway system clock
to global sources of time-based information using UDP.
Its detailed implementation, which is described in RFC 2030, provides a complete and simplified method to
access international time servers to receive, organize and adjust the time-synchronization of the local system.
The SNTP client described herein is a scaled down version of the Network Time Protocol (NTP) which is spec-
ified in RFC 1305. The main difference between an SNTP and an NTP client is the fact that most SNTP clients
will interact with, at most, a single (S)NTP server. Also, SNTP Version 4 clients include an ‘anycast’ mode in
addition to unicast and broadcast access modes not available in past versions of NTP/SNTP clients
5.3.1
SNTP features
The following features are available on the gateway:
•
Boot time and runtime synchronization of the system clock can both be configured
•
SNTP in the gateway system can function in one of three transfer modes:
•
Unicast Mode
The SNTP client sends to a server, located at a specific previously configured address, a request for time
synchronization and expects a reply only from that particular server
•
Broadcast /Multicast Mode
A multicast NTP server periodically transmits a message to the local subnet broadcast address. The cli-
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SNTP
Time zones and daylight savings (summer time)
iMG/RG Software Reference Manual (System Administration)
5-94
ent is configured to listen, and receives the synchronized time-based information. The client then config-
ures itself based on this information, but sends no reply
•
Anycast Mode
When the client is configured in anycast mode, it sends out a sync request to a local subnet broadcast
address. One or several anycast SNTP servers can respond with an individual timestamp and a unicast
address. The client subsequently binds to the first response it receives and continues its operations in a
unicast mode with that particular server. Any other server responses that are received by the client
afterwards are ignored
•
64 local time zones (which include summertime /daylight savings time) configurations are supported (see
Table 6).
•
Automatic periodic timeserver polling is configurable
•
Configuration of packet time-outs and retry transmissions is supported
•
Getting NTP Time Server IP Addresses via DNS lookup can be used
The SNTP client mode session uses the standard remote UDP port 123 for all data transfers. Port 123 will be
used in both the Source Port and Destination Port fields of the UDP header.
5.3.2
Time zones and daylight savings (summer time) conversion
Daylight Savings
(a.k.a. Summer Time) time zones are configurable using the SNTP client. There is also a built-
in firm ware mechanism for the automatic change to/from a standard time/daylight savings time. All the major
world time zone changes are supported.
5.3.3
SNTP command reference
This section describes the commands available on gateway tgatewayo enable, configure and manage
SNTP
module.
5.3.3.1 SNTP CLI commands
The table below lists the
SNTPclient
commands provided by the CLI:
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SNTP command reference
SNTP
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iMG/RG Software Reference Manual (System Administration)
TABLE 5-6
DNS Client Commands
5.3.3.1.1 SNTPCLIENT ADD SERVER
Syntax
SNTPCLIENT ADD SERVER {IPADDRESS <sntpipaddress> | HOSTNAME
<sntphostname>}
Description
This command creates the dedicated unicast server for which the SNTP client can syn-
chronize its time. You can add a server either by specifying the IP address or the host-
name.
Options
The following table gives the range of values for each option that can be specified with
this command and a default value (if applicable).
Commands
Fiber
A
Fiber
B
Fiber
C
Fiber
D
Fiber
E
Modular
ADSL
A
ADSL
B
ADSL
C
SNTPCLIENT ADD SERVER
X
X
X
X
X
X
X
X
X
SNTPCLIENT CLEAR SERVERS
X
X
X
X
X
X
X
X
X
SNTPCLIENT DELETE SERVER
X
X
X
X
X
X
X
X
X
SNTPCLIENT LIST SERVERS
X
X
X
X
X
X
X
X
X
SNTPCLIENT SET DAYLIGHTSAVINGTIME
X
X
X
X
X
X
X
X
X
SNTPCLIENT SET TIMEZONE
X
X
X
X
X
X
X
X
X
SNTPCLIENT SET MODE
X
X
X
X
X
X
X
X
X
SNTPCLIENT SET POLLINTV
X
X
X
X
X
X
X
X
X
SNTPCLIENT SYNC
X
X
X
X
X
X
X
X
X
SNTPCLIENT SET TIMEOUT
X
X
X
X
X
X
X
X
X
SNTPCLIENT SET RETRIES
X
X
X
X
X
X
X
X
X
SNTP SHOW STATUS
X
X
X
X
X
X
X
X
X
SNTPCLIENT SET CLOCK
X
X
X
X
X
X
X
X
X

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