로컬 네트워크에서 Linux 서버에 액세스 할 수 없습니다.

문제 : 새 라우터 (TP-Link AX11000)를 변경 한 후 Windows PC에서 Linux Mint 20.1 PC에 액세스 할 수 없음

라우터 : TP-Link AX11000

컴퓨터 1 : Windows 10 PC

머신 2 : Linux Mint 20.1 PC

새 라우터로 변경하고 모든 장치에 새 IP가 할당 될 때까지 Windows 10 PC에서 Linux Mint 20.1 PC로 winscp / nomachine / ssh를 사용할 수있었습니다. 문제의 원인이 다음과 같은지 잘 모르겠습니다.

1. 연결을 차단하는 ax11000
2. 새로운 IP로 인해 오래된 PC 구성
3. Linux Mint 20.1의 방화벽 (방화벽을 비활성화 sudo ufw disable하고 아래에 언급 된 방법으로 연결을 시도했는데 작동하지 않습니다. 따라서 방화벽이 문제라고 생각하지 않습니다.)
4. 다른 것

WinSCP 오류 :

Network error: Connection to "192.168.0.231" timed out

NoMachine 오류 :

A connection timeout has occurred while trying to connect to '192.168.0.231' on port '4000'. The issue could either be caused by a networking problem, by a firewall or NAT blocking incoming traffic or by a wrong server address. Please verify your configuration and try again.

• UPnP (Universal Plug and Play)가 활성화되고 NoMachine에서 생성 한 포트 4000이 있습니다.

SSH 오류 :

# standard ssh to my linux mint don't work as expected
$ ssh -v [email protected]
OpenSSH_8.2p1 Ubuntu-4ubuntu0.1, OpenSSL 1.1.1f  31 Mar 2020
debug1: Reading configuration data /home/USER/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: include /etc/ssh/ssh_config.d/*.conf matched no files
debug1: /etc/ssh/ssh_config line 21: Applying options for *
debug1: Connecting to 192.168.0.231 [192.168.0.231] port 22.
debug1: connect to address 192.168.0.231 port 22: No route to host
ssh: connect to host 192.168.0.231 port 22: No route to host

# ping the IP address to ensure linux mint pc is up (it's because I am looking at the mint pc), from my Windows to my Linux
ping 192.168.0.231
PING 192.168.0.231 (192.168.0.231) 56(84) bytes of data.
From 192.168.0.194 icmp_seq=7 Destination Host Unreachable
From 192.168.0.194 icmp_seq=10 Destination Host Unreachable
From 192.168.0.194 icmp_seq=13 Destination Host Unreachable
From 192.168.0.194 icmp_seq=16 Destination Host Unreachable
From 192.168.0.194 icmp_seq=19 Destination Host Unreachable
From 192.168.0.194 icmp_seq=22 Destination Host Unreachable
From 192.168.0.194 icmp_seq=25 Destination Host Unreachable
^C
--- 192.168.0.231 ping statistics ---
25 packets transmitted, 0 received, +7 errors, 100% packet loss, time 24778ms

IP 정보 :

$ sudo netstat -anutp | grep :22
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      64417/sshd: /usr/sb 
tcp6       0      0 :::22                   :::*                    LISTEN      64417/sshd: /usr/sb

$ ip addr
...
    inet 192.168.0.231/24 brd 192.168.0.255 scope global dynamic noprefixroute wlp59s0
...

$ hostname -I
192.168.0.231

$ ip r
192.168.0.0/24 dev wlp59s0 proto kernel scope link src 192.168.0.231 metric 600

라우터 설정 방법 : https://www.tp-link.com/us/user-guides/archer-ax11000_v1/chapter-4-set-up-internet-connection#ug-sub-title-1

AX11000 시스템 진단 출력 :

# Windows 10 PC ping
PING 192.168.0.194 (192.168.0.194): 64 data bytes
Reply from 192.168.0.194: bytes=64 ttl=128 seq=1 time=1.632 ms
Reply from 192.168.0.194: bytes=64 ttl=128 seq=2 time=1.620 ms
Reply from 192.168.0.194: bytes=64 ttl=128 seq=3 time=1.327 ms
Reply from 192.168.0.194: bytes=64 ttl=128 seq=4 time=1.722 ms
--- Ping Statistic "192.168.0.194" ---
Packets: Sent=4, Received=4, Lost=0 (0.00% loss)
Round-trip min/avg/max = 1.327/1.575/1.722 ms
ping is stopped. 

# Windows 10 PC traceroute
traceroute to 192.168.0.194, 5 hops max, 38 byte packets
1 * * *
2 * * *
3 * * *
4 * * *
5 * * *
Trace Complete.
traceroute is stopped. 

# Linux Mint 20.1 PC ping
PING 192.168.0.231 (192.168.0.231): 64 data bytes
Reply from 192.168.0.231: bytes=64 ttl=64 seq=1 time=7.350 ms
Reply from 192.168.0.231: bytes=64 ttl=64 seq=2 time=1.145 ms
Reply from 192.168.0.231: bytes=64 ttl=64 seq=3 time=1.307 ms
Reply from 192.168.0.231: bytes=64 ttl=64 seq=4 time=2.178 ms
--- Ping Statistic "192.168.0.231" ---
Packets: Sent=4, Received=4, Lost=0 (0.00% loss)
Round-trip min/avg/max = 1.145/2.995/7.350 ms
ping is stopped. 

# Linux Mint 20.1 PC traceroute
traceroute to 192.168.0.231, 5 hops max, 38 byte packets
1 192.168.0.231 (192.168.0.231) 35.597 ms 35.319 ms 1.242 ms
Trace Complete.
traceroute is stopped. 

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