~ # ntpdate -d 172.20.0.119 Jul 15:48:25 ntpdate[18134]: ntpdate 4.2.8p4@1.3265-o Wed Jun 28 18:08:13 UTC 2017 (1)Looking for host 172.20.0.1 and service ntp172.20.0.1 reversed to firewall.xxxxxxxx.lanhost found : firewall.xxxxxxxxxxxx.lantransmit(172.20.0.1)transmit(172.20.0.1)transmit(172.20.0.1)transmit(172.20.0.1)transmit(172.20.0.1)172.20.0.1: Server dropped: no dataserver 172.20.0.1, port 123stratum 0, precision 0, leap 00, trust 000refid [172.20.0.1], delay 0.00000, dispersion 64.00000transmitted 4, in filter 4reference time: 00000000.00000000 Thu, Feb 7 2036 2:28:16.000originate timestamp: 00000000.00000000 Thu, Feb 7 2036 2:28:16.000transmit timestamp: dd1a360f.7528ae0e Wed, Jul 19 2017 15:48:31.457filter delay: 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 filter offset: 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000delay 0.00000, dispersion 64.00000offset 0.00000019 Jul 15:48:33 ntpdate[18134]: no server suitable for synchronization found
IPv4 UDP 172.20.0.42 * This Firewall 123 (NTP) *
root@firewall:~ # netstat -lnActive Internet connectionsProto Recv-Q Send-Q Local Address Foreign Address (state)tcp4 0 0 172.20.0.1.22 172.20.0.42.53592 ESTABLISHEDudp4 0 0 127.0.0.1.123 *.* udp6 0 0 ::1.123 *.* udp6 0 0 fe80::7271:bcff:fee8:2e1%re0.123 *.* udp4 0 0 172.20.0.1.123 *.*