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← Revision 4 as of 2021-09-23 13:23:35 ⇥
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| Deletions are marked like this. | Additions are marked like this. |
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| === Using Nmap === If Nmap is available: {{{#!bash sudo nmap -sU -Pn -p 123 pool.ntp.org --script=ntp-info }}} Otherwise: === Using Netcat === |
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| === GNU Linux === | ==== GNU Linux ==== |
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| date -d@$((0x`printf c%47s|nc -uw1 10.254.253.201 123|xxd -s40 -l4 -p`-64#23GDW0)) | date -d@$((0x`printf c%47s|nc -uw1 pool.ntp.org 123|xxd -s40 -l4 -p`-64#23GDW0)) |
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| === BSD === | This doesn't work for autistic NTP servers like the one in Foritigate routers, because they dont understand that a space is the same as a NULL byte.. The longer, but more solid version: |
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| date -r$((0x`printf c%47s|nc -uw1 ntp.metas.ch 123|xxd -s40 -l4 -p`-64#23GDW0)) | date -d@$((0x`(printf "\x93"; printf '\0%.0s' {1..47}) |nc -uw1 192.168.9.1 123|xxd -s40 -l4 -p`-64#23GDW0)) |
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| For servers that don't accept ntpv2, but do ntpv4, try to replace `x93` with `xe3` ==== BSD ==== {{{#!bash date -r$((0x`printf c%47s|nc -uw1 pool.ntp.org 123|xxd -s40 -l4 -p`-64#23GDW0)) }}} |
Testing an ntp server without ntpd
Using Nmap
If Nmap is available:
sudo nmap -sU -Pn -p 123 pool.ntp.org --script=ntp-info
Otherwise:
Using Netcat
Source: http://seriot.ch/ntp.php
GNU Linux
date -d@$((0x`printf c%47s|nc -uw1 pool.ntp.org 123|xxd -s40 -l4 -p`-64#23GDW0))
This doesn't work for autistic NTP servers like the one in Foritigate routers, because they dont understand that a space is the same as a NULL byte.. The longer, but more solid version:
date -d@$((0x`(printf "\x93"; printf '\0%.0s' {1..47}) |nc -uw1 192.168.9.1 123|xxd -s40 -l4 -p`-64#23GDW0))For servers that don't accept ntpv2, but do ntpv4, try to replace x93 with xe3
BSD
date -r$((0x`printf c%47s|nc -uw1 pool.ntp.org 123|xxd -s40 -l4 -p`-64#23GDW0))