hi all ,
i hava install NAT server by ---sudo aptitude install ntp.
then update this :-sudo gedit /etc/ntp.conf.

my /etc/ntp.conf file lool like ---
-------------------------------------------------------------
# /etc/ntp.conf, configuration for ntpd; see ntp.conf(5) for help
driftfile /var/lib/ntp/ntp.drift

# Enable this if you want statistics to be logged.
statsdir /var/log/ntpstats/


statistics loopstats peerstats clockstats
filegen loopstats file loopstats type day enable
filegen peerstats file peerstats type day enable
filegen clockstats file clockstats type day enable


# You do need to talk to an NTP server or two (or three).
#server ntp.ubuntu.com
#server ntp0.pipex.net
#server ntp1.pipex.net

server ntp1.sp.se
server ntp2.sp.se

# Access control configuration; see /usr/share/doc/ntp-doc/html/accopt.html for
# details. The web page <http://support.ntp.org/bin/view/Support/AccessRestrictions>
# might also be helpful.
#
# Note that "restrict" applies to both servers and clients, so a configuration
# that might be intended to block requests from certain clients could also end
# up blocking replies from your own upstream servers.

# By default, exchange time with everybody, but don't allow configuration.
#restrict -4 default kod notrap nomodify nopeer noquery
#restrict -6 default kod notrap nomodify nopeer noquery
restrict ntp1.sp.se mask 255.255.255.255 nomodify notrap noquery
restrict ntp2.sp.se mask 255.255.255.255 nomodify notrap noquery




# Local users may interrogate the ntp server more closely.
restrict 127.0.0.1
restrict ::1

# Clients from this (example!) subnet have unlimited access, but only if
# cryptographically authenticated.
#restrict 192.168.123.0 mask 255.255.255.0 notrust
restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap

# If you want to provide time to your local subnet, change the next line.
# (Again, the address is an example only.)
#broadcast 192.168.123.255

# If you want to listen to time broadcasts on your local subnet, de-comment the
# next lines. Please do this only if you trust everybody on the network!
#disable auth
#broadcastclient
------------------------------------------------------------------

sudo /etc/init.d/ntp restart




--- sudo ntpdate -u ntp1.sp.se
gives error:- 9 Jun 16:45:34 ntpdate[8459]: no server suitable for synchronization found

---sudo ntpq -p
gives this:- remote refid st t when poll reach delay offset jitter
==============================================================================
ntp1.sp.se .INIT. 16 u - 64 0 0.000 0.000 0.000
ntp2.sp.se .INIT. 16 u - 64 0 0.000 0.000 0.000

i have tried other server but restult is same .........
plz help me

Can you resolve the name? What does "dig ntp1.sp.se" give you?

"dig ntp1.sp.se" gives:--

; <<>> DiG 9.4.2 <<>> ntp1.sp.se
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 3104
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 0

;; QUESTION SECTION:
;ntp1.sp.se. IN A

;; ANSWER SECTION:
ntp1.sp.se. 300 IN A 62.119.40.98

;; AUTHORITY SECTION:
sp.se. 11648 IN NS dns2.sp.se.
sp.se. 11648 IN NS dns1.sp.se.

;; Query time: 327 msec
;; SERVER: 10.114.1.11#53(10.114.1.11)
;; WHEN: Wed Jun 10 10:08:09 2009
;; MSG SIZE rcvd: 82

I apologize if I am overlooking some aspect of what you are trying to do . . .

Why not just
?