Incorrect OS scanning by using inside docker

[vladimircape]

(base) vladimir@vladimir2-desktop:~/work$ nmap --version Nmap version 7.80 ( https://nmap.org ) Platform: x86_64-pc-linux-gnu Compiled with: liblua-5.3.3 openssl-1.1.1d nmap-libssh2-1.8.2 libz-1.2.11 libpcre-8.39 libpcap-1.9.1 nmap-libdnet-1.12 ipv6 Compiled without: Available nsock engines: epoll poll select
when i tried on my machine

sudo nmap 192.168.100.9 -O
or
sudo nmap 192.168.100.9 -O --osscan-guess

I received very closed results

Starting Nmap 7.80 ( https://nmap.org ) at 2024-02-26 21:12 +03 Nmap scan report for vladimir2-desktop (192.168.100.9) Host is up (0.000048s latency). Not shown: 996 closed ports PORT STATE SERVICE 22/tcp open ssh 3389/tcp open ms-wbt-server 3689/tcp open rendezvous 7070/tcp open realserver Device type: general purpose Running: Linux 2.6.X OS CPE: cpe:/o:linux:linux_kernel:2.6.32 OS details: Linux 2.6.32 Network Distance: 0 hops OS detection performed. Please report any incorrect results at https://nmap.org/submit/ . Nmap done: 1 IP address (1 host up) scanned in 1.60 seconds

but when i execute same command inside docker, result a bad. And also i found that nmap in docker execute much faster rather then on localhost

`base) vladimir@vladimir2-desktop:~/work$ docker run --rm -it instrumentisto/nmap -A -T4 192.168.100.9
Starting Nmap 7.94 ( https://nmap.org ) at 2024-02-26 18:18 UTC
Nmap scan report for 192.168.100.9
Host is up (0.000057s latency).
Not shown: 996 closed tcp ports (reset)
PORT STATE SERVICE VERSION
22/tcp open ssh OpenSSH 8.2p1 Ubuntu 4ubuntu0.11 (Ubuntu Linux; protocol 2.0)
| ssh-hostkey:
| 3072 11:05:82:dd:3f:e9:69:55:e8:9e:12:5b:7c:33:6f:fb (RSA)
| 256 11:15:c3:1e:de:fd:e9:5d:d6:93:89:6c:bb:e9:c7:f8 (ECDSA)
|_ 256 04:4d:0c:31:11:5c:52:42:a2:2a:45:e5:cf:52:af:50 (ED25519)
3389/tcp open ms-wbt-server xrdp
3689/tcp open daap mt-daapd DAAP
7070/tcp open ssl/realserver?
| ssl-cert: Subject: commonName=AnyDesk Client
| Not valid before: 2023-08-03T05:43:28
|_Not valid after: 2073-07-21T05:43:28
|_ssl-date: TLS randomness does not represent time
Device type: general purpose
Running: Linux 4.X|5.X
OS CPE: cpe:/o:linux:linux_kernel:4 cpe:/o:linux:linux_kernel:5
OS details: Linux 4.15 - 5.8
Network Distance: 1 hop
Service Info: OS: Linux; CPE: cpe:/o:linux:linux_kernel

TRACEROUTE (using port 587/tcp)
HOP RTT ADDRESS
1 0.08 ms 192.168.100.9

OS and Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 13.33 seconds
`