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pigreco
Apprentice
Apprentice


Joined: 16 Nov 2005
Posts: 223
Location: Italia

PostPosted: Fri Oct 31, 2014 2:17 pm    Post subject: ntpd not work Reply with quote

Hi,
hi have a issue with ntpd service on my server, I want a Time Server for sincronize all my others servers; the problem is that ntpd daemon non reach peers.

I have checked firewall many time and is ok, furthermore stopping the firewall not changhe the situation, the port 123 for udp is open

Code:
sudo nmap -sU -P0 -p 123 etaromdue.etarom.com

Starting Nmap 6.46 ( http://nmap.org ) at 2014-10-31 15:08 CET
Nmap scan report for etaromdue.etarom.com (77.72.24.73)
Host is up (0.062s latency).
PORT    STATE SERVICE
123/udp open  ntp

Nmap done: 1 IP address (1 host up) scanned in 0.09 seconds


but ntpd not reach, in debug mode I have see only transmission log but not receptions, so:

Code:
ntpq -pn 127.0.0.1
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
 194.116.87.4    .INIT.          16 u    -  256    0    0.000    0.000   0.000
 62.48.53.90     .INIT.          16 u    -  256    0    0.000    0.000   0.000
 212.45.144.16   .INIT.          16 u    -  256    0    0.000    0.000   0.000
 72.52.4.121     .INIT.          16 u    -  256    0    0.000    0.000   0.000
 84.201.30.243   .INIT.          16 u    -  256    0    0.000    0.000   0.000
 120.88.46.10    .INIT.          16 u    -  128    0    0.000    0.000   0.000
 113.30.137.34   .INIT.          16 u    -  128    0    0.000    0.000   0.000
 202.71.140.36   .INIT.          16 u    -  128    0    0.000    0.000   0.000
 123.108.225.6   .INIT.          16 u    -  128    0    0.000    0.000   0.000
*127.127.1.0     .LOCL.          10 l   23   64  377    0.000    0.000   0.000


ntpdate work

Code:
ntpdate -d -u -v 2.it.pool.ntp.org
31 Oct 15:06:37 ntpdate[17314]: ntpdate 4.2.6p5@1.2349-o Fri Oct 31 13:42:24 UTC 2014 (1)
Looking for host 2.it.pool.ntp.org and service ntp
host found : gw-ge.esaote.com
transmit(83.103.98.242)
receive(83.103.98.242)
transmit(93.62.188.182)
receive(93.62.188.182)
transmit(212.45.144.3)
receive(212.45.144.3)
transmit(83.103.98.242)
receive(83.103.98.242)
transmit(93.62.188.182)
receive(93.62.188.182)
transmit(212.45.144.3)
receive(212.45.144.3)
transmit(83.103.98.242)
receive(83.103.98.242)
transmit(93.62.188.182)
receive(93.62.188.182)
transmit(212.45.144.3)
receive(212.45.144.3)
transmit(83.103.98.242)
receive(83.103.98.242)
transmit(93.62.188.182)
receive(93.62.188.182)
transmit(212.45.144.3)
receive(212.45.144.3)
server 83.103.98.242, port 123
stratum 3, precision -18, leap 00, trust 000
refid [83.103.98.242], delay 0.10535, dispersion 0.00053
transmitted 4, in filter 4
reference time:    d7fe1600.a7a8fc10  Fri, Oct 31 2014 15:06:56.654
originate timestamp: d7fe1609.e79d21fa  Fri, Oct 31 2014 15:07:05.904
transmit timestamp:  d7fe15f3.8a05029e  Fri, Oct 31 2014 15:06:43.539
filter delay:  0.10535  0.10818  0.10547  0.11256
         0.00000  0.00000  0.00000  0.00000
filter offset: 22.32228 22.32066 22.32204 22.32206
         0.000000 0.000000 0.000000 0.000000
delay 0.10535, dispersion 0.00053
offset 22.322284

server 93.62.188.182, port 123
stratum 2, precision -20, leap 00, trust 000
refid [93.62.188.182], delay 0.05470, dispersion 0.00002
transmitted 4, in filter 4
reference time:    d7fe0e5a.ec2b6228  Fri, Oct 31 2014 14:34:18.922
originate timestamp: d7fe160a.0d03a1cc  Fri, Oct 31 2014 15:07:06.050
transmit timestamp:  d7fe15f3.bd38559c  Fri, Oct 31 2014 15:06:43.739
filter delay:  0.05479  0.05487  0.05470  0.05478
         0.00000  0.00000  0.00000  0.00000
filter offset: 22.29717 22.29719 22.29714 22.29710
         0.000000 0.000000 0.000000 0.000000
delay 0.05470, dispersion 0.00002
offset 22.297142

server 212.45.144.3, port 123
stratum 2, precision -20, leap 00, trust 000
refid [212.45.144.3], delay 0.04109, dispersion 0.00063
transmitted 4, in filter 4
reference time:    d7fe0e3b.8e2578d8  Fri, Oct 31 2014 14:33:47.555
originate timestamp: d7fe160a.3fe771b2  Fri, Oct 31 2014 15:07:06.249
transmit timestamp:  d7fe15f3.f06b6a0e  Fri, Oct 31 2014 15:06:43.939
filter delay:  0.04117  0.04126  0.04109  0.04887
         0.00000  0.00000  0.00000  0.00000
filter offset: 22.29480 22.29482 22.29466 22.29880
         0.000000 0.000000 0.000000 0.000000
delay 0.04109, dispersion 0.00063
offset 22.294662

31 Oct 15:06:43 ntpdate[17314]: step time server 212.45.144.3 offset 22.294662 sec


I have changed /etc/ntp.conf many times uselessly now it is:
Code:
cat /etc/ntp.conf
# NOTES:
# DHCP clients can append or replace NTP configuration files.
# You should consult your DHCP client documentation about its
# default behaviour and how to change it.
disable monitor

logconfig =all
logfile /var/log/ntp
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

# To deny other machines from changing the
# configuration but allow localhost:
#restrict default limited kod nomodify notrap nopeer noquery
restrict default limited nomodify notrap nopeer kod noquery

restrict 127.0.0.1

# Un-comment the next line, to act as a time server to the local network
restrict 192.168.1.1 mask 255.255.255.0 nomodify nopeer notrap
restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap nopeer

# Name of the servers ntpd should sync with
# Please respect the access policy as stated by the responsible person.
#server      ntp.example.tld      iburst

server -4 2.it.pool.ntp.org iburst
#restrict 2.it.pool.ntp.org

server -4 ntp.prato.linux.it iburst
#restrict ntp.prato.linux.it nomodify notrap nopeer noquery

server -4 0.pool.ntp.org iburst
#restrict 0.pool.ntp.org nomodify notrap nopeer noquery

server -4 ntp.ionn.net iburst
#restrict ntp.ionn.net nomodify notrap nopeer noquery

server ntp5.berlin-provider.de iburst
#restrict ntp5.berlin-provider.de nomodify notrap nopeer noquery

server -4 0.in.pool.ntp.org
server -4 1.in.pool.ntp.org
server -4 2.in.pool.ntp.org
server -4 3.in.pool.ntp.org


server 127.127.1.0
fudge  127.127.1.0 stratum 10



#server ntplocal.example.com prefer
#server timeserver.example.org

# Warning: Using default NTP settings will leave your NTP
# server accessible to all hosts on the Internet.

# If you want to deny all machines (including your own)
# from accessing the NTP server, uncomment:
#restrict default ignore


# To allow machines within your network to synchronize
# their clocks with your server, but ensure they are
# not allowed to configure the server or used as peers
# to synchronize against, uncomment this line.
#
#restrict 192.168.0.0 mask 255.255.255.0 nomodify nopeer notrap

 # Allow ntp to automatically correct predictable clock drift
 driftfile /var/lib/ntp/ntp.drift


I have spend many time to investigate but I can't understand where is the problem,
any suggestion is appreciated, regards
Maurizio
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DONAHUE
Watchman
Watchman


Joined: 09 Dec 2006
Posts: 7550
Location: Goose Creek SC

PostPosted: Sat Nov 01, 2014 12:01 am    Post subject: Reply with quote

suggest clean up the intended local time server with
Code:
rm /etc/ntp.conf
emerge ntp
and verify that it can contact the gentoo time servers with
Code:
rc-update add ntpd default
/etc/init.d/ntpd restart
/etc/init.d/ntp-client restart
once the local time server is updating itself properly from the gentoo servers use https://wiki.gentoo.org/wiki/Ntp as a guide in choosing other internet time servers if you wish to do so. test that, then configure your local server to respond to requests from local clients. then configure local clients to use the local server.
_________________
Defund the FCC.
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pigreco
Apprentice
Apprentice


Joined: 16 Nov 2005
Posts: 223
Location: Italia

PostPosted: Mon Nov 03, 2014 9:22 am    Post subject: Reply with quote

hi, thanks for reply
ok, I get it, you tell me to try a clean install

I have removed ntp.conf e reinstalled the package, now the configuration is default:

Code:
cat /etc/ntp.conf
# NOTES:
# DHCP clients can append or replace NTP configuration files.
# You should consult your DHCP client documentation about its
# default behaviour and how to change it.

# Name of the servers ntpd should sync with
# Please respect the access policy as stated by the responsible person.
#server      ntp.example.tld      iburst

# Common pool for random people
#server pool.ntp.org

# Pools for Gentoo users
server 0.gentoo.pool.ntp.org
server 1.gentoo.pool.ntp.org
server 2.gentoo.pool.ntp.org
server 3.gentoo.pool.ntp.org

##
# A list of available servers can be found here:
# http://www.pool.ntp.org/
# http://www.pool.ntp.org/#use
# A good way to get servers for your machine is:
# netselect -s 3 pool.ntp.org
##

# you should not need to modify the following paths
driftfile   /var/lib/ntp/ntp.drift

#server ntplocal.example.com prefer
#server timeserver.example.org

# Warning: Using default NTP settings will leave your NTP
# server accessible to all hosts on the Internet.

# If you want to deny all machines (including your own)
# from accessing the NTP server, uncomment:
#restrict default ignore


# Default configuration:
# - Allow only time queries, at a limited rate, sending KoD when in excess.
# - Allow all local queries (IPv4, IPv6)
restrict default nomodify nopeer noquery limited kod
restrict 127.0.0.1
restrict [::1]


# To allow machines within your network to synchronize
# their clocks with your server, but ensure they are
# not allowed to configure the server or used as peers
# to synchronize against, uncomment this line.
#
#restrict 192.168.0.0 mask 255.255.255.0 nomodify nopeer notrap


the behavior not change, in debug mode:

Quote:
ntpd 4.2.6p5@1.2349-o Mon Nov 3 08:59:27 UTC 2014 (1)
3 Nov 10:09:59 ntpd[2474]: proto: precision = 0.400 usec
event at 0 0.0.0.0 c01d 0d kern kernel time sync enabled
Finished Parsing!!
3 Nov 10:09:59 ntpd[2474]: ntp_io: estimated max descriptors: 1024, initial socket boundary: 16
3 Nov 10:09:59 ntpd[2474]: Listen and drop on 0 v4wildcard 0.0.0.0 UDP 123
3 Nov 10:09:59 ntpd[2474]: Listen and drop on 1 v6wildcard :: UDP 123
3 Nov 10:09:59 ntpd[2474]: Listen normally on 2 lo 127.0.0.1 UDP 123
restrict: op 1 addr 127.0.0.1 mask 255.255.255.255 mflags 00003000 flags 00000001
3 Nov 10:09:59 ntpd[2474]: Listen normally on 3 eth0 77.72.24.73 UDP 123
restrict: op 1 addr 77.72.24.73 mask 255.255.255.255 mflags 00003000 flags 00000001
3 Nov 10:09:59 ntpd[2474]: Listen normally on 4 eth0:1 77.72.24.80 UDP 123
restrict: op 1 addr 77.72.24.80 mask 255.255.255.255 mflags 00003000 flags 00000001
3 Nov 10:09:59 ntpd[2474]: Listen normally on 5 eth1 192.168.1.6 UDP 123
restrict: op 1 addr 192.168.1.6 mask 255.255.255.255 mflags 00003000 flags 00000001
3 Nov 10:09:59 ntpd[2474]: Listen normally on 6 sit0 ::77.72.24.80 UDP 123
restrict: op 1 addr ::77.72.24.80 mask ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff mflags 00003000 flags 00000001
3 Nov 10:09:59 ntpd[2474]: Listen normally on 7 eth1 fe80::20e:cff:fe71:7f74 UDP 123
restrict: op 1 addr fe80::20e:cff:fe71:7f74 mask ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff mflags 00003000 flags 00000001
3 Nov 10:09:59 ntpd[2474]: Listen normally on 8 sit0 ::192.168.1.6 UDP 123
restrict: op 1 addr ::192.168.1.6 mask ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff mflags 00003000 flags 00000001
3 Nov 10:09:59 ntpd[2474]: Listen normally on 9 eth0 fe80::212:3fff:fe21:b4e UDP 123
restrict: op 1 addr fe80::212:3fff:fe21:b4e mask ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff mflags 00003000 flags 00000001
3 Nov 10:09:59 ntpd[2474]: Listen normally on 10 sit0 ::77.72.24.73 UDP 123
restrict: op 1 addr ::77.72.24.73 mask ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff mflags 00003000 flags 00000001
3 Nov 10:09:59 ntpd[2474]: Listen normally on 11 sit0 ::127.0.0.1 UDP 123
restrict: op 1 addr ::127.0.0.1 mask ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff mflags 00003000 flags 00000001
3 Nov 10:09:59 ntpd[2474]: Listen normally on 12 lo ::1 UDP 123
restrict: op 1 addr ::1 mask ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff mflags 00003000 flags 00000001
3 Nov 10:09:59 ntpd[2474]: peers refreshed
3 Nov 10:09:59 ntpd[2474]: Listening on routing socket on fd #29 for interface updates
restrict: op 1 addr 0.0.0.0 mask 0.0.0.0 mflags 00000000 flags 000004f0
restrict: op 1 addr :: mask 0.0.0.0 mflags 00000000 flags 000004f0
restrict: op 1 addr 127.0.0.1 mask 255.255.255.255 mflags 00000000 flags 00000000
restrict: op 1 addr ::1 mask ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff mflags 00000000 flags 00000000
restrict: op 1 addr 192.168.1.0 mask 255.255.255.0 mflags 00000000 flags 00000190
key_expire: at 0 associd 53928
peer_clear: at 0 next 1 associd 53928 refid INIT
event at 0 212.121.88.250 8011 81 mobilize assoc 53928
newpeer: 77.72.24.73->212.121.88.250 mode 3 vers 4 poll 6 10 flags 0x1 0x1 ttl 0 key 00000000
key_expire: at 0 associd 53929
peer_clear: at 0 next 2 associd 53929 refid INIT
event at 0 84.38.50.20 8011 81 mobilize assoc 53929
newpeer: 77.72.24.73->84.38.50.20 mode 3 vers 4 poll 6 10 flags 0x1 0x1 ttl 0 key 00000000
key_expire: at 0 associd 53930
peer_clear: at 0 next 3 associd 53930 refid INIT
event at 0 5.249.146.81 8011 81 mobilize assoc 53930
newpeer: 77.72.24.73->5.249.146.81 mode 3 vers 4 poll 6 10 flags 0x1 0x1 ttl 0 key 00000000
key_expire: at 0 associd 53931
peer_clear: at 0 next 4 associd 53931 refid INIT
event at 0 212.45.144.16 8011 81 mobilize assoc 53931
newpeer: 77.72.24.73->212.45.144.16 mode 3 vers 4 poll 6 10 flags 0x1 0x1 ttl 0 key 00000000
event at 0 0.0.0.0 c016 06 restart
event at 0 0.0.0.0 c012 02 freq_set kernel -17.527 PPM
transmit: at 1 77.72.24.73->212.121.88.250 mode 3 len 48
auth_agekeys: at 1 keys 1 expired 0
transmit: at 2 77.72.24.73->84.38.50.20 mode 3 len 48
transmit: at 3 77.72.24.73->5.249.146.81 mode 3 len 48
transmit: at 4 77.72.24.73->212.45.144.16 mode 3 len 48
transmit: at 130 77.72.24.73->212.121.88.250 mode 3 len 48
transmit: at 134 77.72.24.73->84.38.50.20 mode 3 len 48
transmit: at 136 77.72.24.73->5.249.146.81 mode 3 len 48
transmit: at 137 77.72.24.73->212.45.144.16 mode 3 len 48
.......


Code:


ntpq -pn
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
 84.38.50.20     .INIT.          16 u    -   64    0    0.000    0.000   0.000
 194.116.87.4    .INIT.          16 u    -   64    0    0.000    0.000   0.000
 212.45.144.88   .INIT.          16 u    -   64    0    0.000    0.000   0.000
 37.247.50.70    .INIT.          16 u    -   64    0    0.000    0.000   0.000


the ntpd server not receive and not reach peers, but btp-client still work well through the port 123

Code:

ntpdate -d -u -v 2.it.pool.ntp.org
 3 Nov 10:18:58 ntpdate[3194]: ntpdate 4.2.6p5@1.2349-o Mon Nov  3 08:59:28 UTC 2014 (1)
Looking for host 2.it.pool.ntp.org and service ntp
host found : tucano.isti.cnr.it
transmit(146.48.81.102)
receive(146.48.81.102)
transmit(212.45.144.88)
receive(212.45.144.88)
transmit(212.121.88.250)
receive(212.121.88.250)
transmit(146.48.81.102)
receive(146.48.81.102)
transmit(212.45.144.88)
receive(212.45.144.88)
transmit(212.121.88.250)
receive(212.121.88.250)
transmit(146.48.81.102)
receive(146.48.81.102)
transmit(212.45.144.88)
receive(212.45.144.88)
transmit(212.121.88.250)
receive(212.121.88.250)
transmit(146.48.81.102)
receive(146.48.81.102)
transmit(212.45.144.88)
receive(212.45.144.88)
transmit(212.121.88.250)
receive(212.121.88.250)
server 146.48.81.102, port 123
stratum 2, precision -22, leap 00, trust 000
refid [146.48.81.102], delay 0.04733, dispersion 0.00008
transmitted 4, in filter 4
reference time:    d801c559.9d37cacd  Mon, Nov  3 2014 10:11:53.614
originate timestamp: d801c708.c4e91aa6  Mon, Nov  3 2014 10:19:04.769
transmit timestamp:  d801c708.c1e8c6ca  Mon, Nov  3 2014 10:19:04.757
filter delay:  0.04851  0.04733  0.04767  0.04753
         0.00000  0.00000  0.00000  0.00000
filter offset: 0.001236 0.000821 0.000848 0.000744
         0.000000 0.000000 0.000000 0.000000
delay 0.04733, dispersion 0.00008
offset 0.000821

server 212.45.144.88, port 123
stratum 2, precision -19, leap 00, trust 000
refid [212.45.144.88], delay 0.04108, dispersion 0.00070
transmitted 4, in filter 4
reference time:    d801bfb4.bfb217a3  Mon, Nov  3 2014  9:47:48.748
originate timestamp: d801c708.f7542061  Mon, Nov  3 2014 10:19:04.966
transmit timestamp:  d801c708.f51be89c  Mon, Nov  3 2014 10:19:04.957
filter delay:  0.04361  0.04477  0.04108  0.04166
         0.00000  0.00000  0.00000  0.00000
filter offset: 0.001596 0.002033 0.000263 0.000613
         0.000000 0.000000 0.000000 0.000000
delay 0.04108, dispersion 0.00070
offset 0.000263

server 212.121.88.250, port 123
stratum 3, precision -20, leap 00, trust 000
refid [212.121.88.250], delay 0.04106, dispersion 0.00050
transmitted 4, in filter 4
reference time:    d801c4ea.46631158  Mon, Nov  3 2014 10:10:02.274
originate timestamp: d801c709.2ad0dd69  Mon, Nov  3 2014 10:19:05.167
transmit timestamp:  d801c709.284f1db9  Mon, Nov  3 2014 10:19:05.157
filter delay:  0.04602  0.04239  0.04123  0.04106
         0.00000  0.00000  0.00000  0.00000
filter offset: 0.004312 0.002646 0.002241 0.002046
         0.000000 0.000000 0.000000 0.000000
delay 0.04106, dispersion 0.00050
offset 0.002046

 3 Nov 10:19:05 ntpdate[3194]: adjust time server 212.45.144.88 offset 0.000263 sec
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gerdesj
l33t
l33t


Joined: 29 Sep 2005
Posts: 621
Location: Yeovil, Somerset, UK

PostPosted: Fri Nov 14, 2014 11:11 pm    Post subject: Reply with quote

Where to start 8)

You have several external IP addresses on this system so be careful with using the default config - it is designed for a system behind a NAT router and not the router itself.

Please post the output from:

#ip r
#ip a
#cat /etc/resolv.conf

Restart ntpd whilst this is running in a terminal:
#tcpdump -i eth0 "udp and port 123"

Change eth0 in the above to the external interface if I have got your logs wrong.

You have a sit0 interface - shut it down and restart ntpd and see if that helps.

You have the same version of ntpd as I do and it works flawlessly on my laptop despite hibernation, sleeping and changing networks, sometimes on wifi and sometimes on ethernet We will get to the bottom of the problem eventually.

Cheers
Jon
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pigreco
Apprentice
Apprentice


Joined: 16 Nov 2005
Posts: 223
Location: Italia

PostPosted: Wed Nov 19, 2014 9:13 am    Post subject: Reply with quote

hi, thanks for reply
I had to change the server for hardware issues, so I have a different ip

Code:
~ # ip r
default via 77.72.24.65 dev eth1  metric 3
77.72.24.64/27 dev eth1  proto kernel  scope link  src 77.72.24.78
127.0.0.0/8 dev lo  scope host
127.0.0.0/8 via 127.0.0.1 dev lo
192.168.1.0/24 dev eth0  proto kernel  scope link  src 192.168.1.20

Code:
 ~ # ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 brd 127.255.255.255 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:13:72:5a:03:aa brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.20/24 brd 192.168.1.255 scope global eth0
       valid_lft forever preferred_lft forever
    inet6 fe80::213:72ff:fe5a:3aa/64 scope link
       valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:13:72:5a:03:ab brd ff:ff:ff:ff:ff:ff
    inet 77.72.24.78/27 brd 77.72.24.95 scope global eth1
       valid_lft forever preferred_lft forever
    inet6 fe80::213:72ff:fe5a:3ab/64 scope link
       valid_lft forever preferred_lft forever


Code:
~ # cat /etc/resolv.dnsmasq
# Generated by net-scripts for interface eth0
nameserver 77.72.24.233
nameserver 77.72.24.234
nameserver 208.67.222.222
nameserver 208.67.220.220
nameserver 195.186.1.11


Code:
~ # tcpdump -i eth1 "udp and port 123"
error : ret -1
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth1, link-type EN10MB (Ethernet), capture size 65535 bytes
10:06:44.626469 IP etaromcinque.etarom.com.ntp > terminus.develer.net.ntp: NTPv4, Client, length 48
10:06:45.626413 IP etaromcinque.etarom.com.ntp > 93-62-184-77.ip23.fastwebnet.it.ntp: NTPv4, Client, length 48
10:06:46.626421 IP etaromcinque.etarom.com.ntp > ntp.ngi.it.ntp: NTPv4, Client, length 48
10:06:47.626428 IP etaromcinque.etarom.com.ntp > gate.evil.systems.ntp: NTPv4, Client, length 48
10:07:50.626414 IP etaromcinque.etarom.com.ntp > terminus.develer.net.ntp: NTPv4, Client, length 48
10:07:51.626401 IP etaromcinque.etarom.com.ntp > 93-62-184-77.ip23.fastwebnet.it.ntp: NTPv4, Client, length 48
10:07:52.626405 IP etaromcinque.etarom.com.ntp > ntp.ngi.it.ntp: NTPv4, Client, length 48
10:07:54.626406 IP etaromcinque.etarom.com.ntp > gate.evil.systems.ntp: NTPv4, Client, length 48
10:08:54.626378 IP etaromcinque.etarom.com.ntp > terminus.develer.net.ntp: NTPv4, Client, length 48
10:08:55.626385 IP etaromcinque.etarom.com.ntp > 93-62-184-77.ip23.fastwebnet.it.ntp: NTPv4, Client, length 48
10:08:56.626387 IP etaromcinque.etarom.com.ntp > ntp.ngi.it.ntp: NTPv4, Client, length 48
10:09:01.626374 IP etaromcinque.etarom.com.ntp > gate.evil.systems.ntp: NTPv4, Client, length 48
10:09:59.626381 IP etaromcinque.etarom.com.ntp > terminus.develer.net.ntp: NTPv4, Client, length 48
10:10:00.626388 IP etaromcinque.etarom.com.ntp > 93-62-184-77.ip23.fastwebnet.it.ntp: NTPv4, Client, length 48
10:10:03.626377 IP etaromcinque.etarom.com.ntp > ntp.ngi.it.ntp: NTPv4, Client, length 48
10:10:06.626371 IP etaromcinque.etarom.com.ntp > gate.evil.systems.ntp: NTPv4, Client, length 48



firewall check from my office
Code:
~ $ sudo nmap -sU -P0 -p 123 etaromcinque.etarom.com

Starting Nmap 6.46 ( http://nmap.org ) at 2014-11-19 10:12 CET
Nmap scan report for etaromcinque.etarom.com (77.72.24.78)
Host is up (0.031s latency).
PORT    STATE SERVICE
123/udp open  ntp

Nmap done: 1 IP address (1 host up) scanned in 0.06 seconds
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