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Philippe2021's avatar
Philippe2021
Guide
Jun 11, 2021

Connecting two linux PCs by ssh

Hello,   I have two Ubuntu PCs on my network. I can use ssh from one PC to the other one if they are connected by ethernet to the router. I can't if one of the two PCs is connected by wifi.   I r...
Philippe2021's avatar
Philippe2021
Guide
Jun 12, 2021
A _computer_ does not have an IP address; a network _interface_ has
an IP address.  If a computer has more than one active network
interface, then each one must have its own IP address.  If you're trying
to reach a computer's wireless interface at the IP address of that
computer's (disconnected) Ethernet interface, then I'd expect problems.

I pick the IP adress in the Web interface of the router of course.

What, exactly
is "<pc2>"

<pc2> is an IP adress. Right now, my laptop computer is on wifi, and my desktop computer always on ethernet, and I have that from my desktop (mars):

XXX@mars:~$ ssh 192.168.1.4
^C
XXX@mars:~$ ping 192.168.1.4
PING 192.168.1.4 (192.168.1.4) 56(84) bytes of data.
64 octets de 192.168.1.4 : icmp_seq=1 ttl=64 temps=198 ms
64 octets de 192.168.1.4 : icmp_seq=2 ttl=64 temps=16.4 ms
^C
--- statistiques ping 192.168.1.4 ---
2 paquets transmis, 2 reçus, 0 % paquets perdus, temps 1002 ms
rtt min/avg/max/mdev = 16.434/107.459/198.484/91.025 ms

My desktop computer can ping 192.168.1.4 which is my laptop on wifi but not get a ssh connection.

Even a

dmesg

does not give any information, not even a timeout message. The wifi blocks ssh for some reason (the port 22 is blocked maybe for some reason).

 

 

 

 

 

 

Philippe2021's avatar
Philippe2021
Guide
Jun 12, 2021

I can give the logs of the router but that won't help I guess.

 

[admin login] from source 192.168.1.30, Saturday, June 12, 2021 08:16:44
[DoS Attack: SYN/ACK Scan] from source: 52.162.107.6, port 443, Saturday, June 12, 2021 08:11:20
[DumaOS] Marking device that is marked 192.168.1.3 11 10., Saturday, June 12, 2021 07:49:19
[DumaOS] DHCP lease change., Saturday, June 12, 2021 07:48:39
[DumaOS] DHCP new event., Saturday, June 12, 2021 07:48:39
[DHCP IP: 192.168.1.3] to MAC address 24:20:c7:1c:42:c9, Saturday, June 12, 2021 07:48:39
[DumaOS] Marking device that is marked 192.168.1.3 11 10., Saturday, June 12, 2021 07:48:28
[DumaOS] Marking device that is marked 192.168.1.3 11 10., Saturday, June 12, 2021 07:46:58
[DumaOS] Marking device that is marked 192.168.1.3 11 10., Saturday, June 12, 2021 07:46:29
[DumaOS] Marking device that is marked 192.168.1.3 11 10., Saturday, June 12, 2021 07:46:14
[DumaOS] Marking device that is marked 192.168.1.3 11 10., Saturday, June 12, 2021 07:45:28
[DumaOS] DHCP lease change., Saturday, June 12, 2021 07:44:53
[DumaOS] DHCP new event., Saturday, June 12, 2021 07:44:53
[DHCP IP: 192.168.1.3] to MAC address 24:20:c7:1c:42:c9, Saturday, June 12, 2021 07:44:53
[DumaOS] DHCP lease change., Saturday, June 12, 2021 07:44:27
[DumaOS] DHCP new event., Saturday, June 12, 2021 07:44:27
[DHCP IP: 192.168.1.3] to MAC address 24:20:c7:1c:42:c9, Saturday, June 12, 2021 07:44:27
[DumaOS] Using disabled(NOP) QoS subclass, Saturday, June 12, 2021 07:44:26
[DumaOS] Using disabled(NOP) QoS subclass, Saturday, June 12, 2021 07:44:26
[DumaOS] Using disabled(NOP) QoS subclass, Saturday, June 12, 2021 07:44:25
[DumaOS] Using disabled(NOP) QoS subclass, Saturday, June 12, 2021 07:44:25
[DumaOS] Using disabled(NOP) QoS subclass, Saturday, June 12, 2021 07:44:24
[DumaOS] DHCP lease change., Saturday, June 12, 2021 07:43:28
[DHCP IP: 192.168.1.3] to MAC address 24:20:c7:1c:42:c9, Saturday, June 12, 2021 07:43:28
[DumaOS] Marking device that is marked 192.168.1.3 11 10., Saturday, June 12, 2021 07:42:36
[DumaOS] DHCP lease change., Saturday, June 12, 2021 07:42:04
[DumaOS] DHCP new event., Saturday, June 12, 2021 07:42:04
[DHCP IP: 192.168.1.3] to MAC address 24:20:c7:1c:42:c9, Saturday, June 12, 2021 07:42:04
[DumaOS] Marking device that is marked 192.168.1.3 11 10., Saturday, June 12, 2021 07:41:06
[DumaOS] Marking device that is marked 192.168.1.3 11 10., Saturday, June 12, 2021 07:40:25
[DumaOS] Marking device that is marked 192.168.1.3 11 10., Saturday, June 12, 2021 07:40:14
[admin login] from source 192.168.1.30, Saturday, June 12, 2021 07:39:21
[DumaOS] Marking device that is marked 192.168.1.3 11 10., Saturday, June 12, 2021 07:39:16
[DumaOS] DHCP lease change., Saturday, June 12, 2021 07:39:15
[DumaOS] DHCP new event., Saturday, June 12, 2021 07:39:15
[DHCP IP: 192.168.1.3] to MAC address 24:20:c7:1c:42:c9, Saturday, June 12, 2021 07:39:15
[DumaOS] Marking device that is marked 192.168.1.3 11 10., Saturday, June 12, 2021 07:38:59
[DumaOS] Marking device that is marked 192.168.1.3 11 10., Saturday, June 12, 2021 07:38:53
[DumaOS] DHCP lease change., Saturday, June 12, 2021 07:38:47
[DumaOS] DHCP new event., Saturday, June 12, 2021 07:38:47
[DHCP IP: 192.168.1.4] to MAC address 9c:b6:d0:8d:a5:3f, Saturday, June 12, 2021 07:38:47
[DumaOS] DHCP lease change., Saturday, June 12, 2021 07:38:47
[DumaOS] DHCP new event., Saturday, June 12, 2021 07:38:47
[DHCP IP: 192.168.1.4] to MAC address 9c:b6:d0:8d:a5:3f, Saturday, June 12, 2021 07:38:47
[DumaOS] Marking device that is marked 192.168.1.3 11 10., Saturday, June 12, 2021 07:38:16
[DumaOS] Marking device that is marked 192.168.1.3 11 10., Saturday, June 12, 2021 07:37:46
[admin login] from source 192.168.1.4, Saturday, June 12, 2021 07:36:53
[DumaOS] Marking device that is marked 192.168.1.3 11 10., Saturday, June 12, 2021 07:36:46
[DumaOS] Marking device that is marked 192.168.1.3 11 10., Saturday, June 12, 2021 07:36:16
[DumaOS] DHCP new lease allocated., Saturday, June 12, 2021 07:35:44
[DumaOS] DHCP new event., Saturday, June 12, 2021 07:35:44
[DHCP IP: 192.168.1.4] to MAC address 9c:b6:d0:8d:a5:3f, Saturday, June 12, 2021 07:35:44
[DumaOS] Marking device that is marked 192.168.1.3 11 10., Saturday, June 12, 2021 07:35:20
[DumaOS] Marking device that is marked 192.168.1.3 11 10., Saturday, June 12, 2021 07:34:46
[DumaOS] DHCP lease change., Saturday, June 12, 2021 07:33:38
[DumaOS] DHCP new event., Saturday, June 12, 2021 07:33:38
[DHCP IP: 192.168.1.3] to MAC address 24:20:c7:1c:42:c9, Saturday, June 12, 2021 07:33:38
[DumaOS] Marking device that is marked 192.168.1.3 11 10., Saturday, June 12, 2021 07:33:12
[DumaOS] Marking device that is marked 192.168.1.3 11 10., Saturday, June 12, 2021 07:32:54
[DoS Attack: SYN/ACK Scan] from source: 52.162.107.6, port 443, Saturday, June 12, 2021 07:32:49
[DumaOS] Marking device that is marked 192.168.1.3 11 10., Saturday, June 12, 2021 07:32:47
[DumaOS] Marking device that is marked 192.168.1.3 11 10., Saturday, June 12, 2021 07:32:22
[DumaOS] Marking device that is marked 192.168.1.3 11 10., Saturday, June 12, 2021 07:31:42
[DumaOS] Marking device that is marked 192.168.1.3 11 10., Saturday, June 12, 2021 07:30:42
[DumaOS] Marking device that is marked 192.168.1.3 11 10., Saturday, June 12, 2021 07:30:12
[DumaOS] Marking device that is marked 192.168.1.3 11 10., Saturday, June 12, 2021 07:29:38
[DumaOS] Marking device that is marked 192.168.1.3 11 10., Saturday, June 12, 2021 07:28:55
[DumaOS] Marking device that is marked 192.168.1.3 11 10., Saturday, June 12, 2021 07:28:29
[DumaOS] Marking device that is marked 192.168.1.3 11 10., Saturday, June 12, 2021 07:28:13
[DumaOS] Marking device that is marked 192.168.1.3 11 10., Saturday, June 12, 2021 07:27:25
[DumaOS] Marking device that is marked 192.168.1.3 11 10., Saturday, June 12, 2021 07:25:55
[DumaOS] Marking device that is marked 192.168.1.3 11 10., Saturday, June 12, 2021 07:24:34
[DumaOS] DHCP new lease allocated., Saturday, June 12, 2021 07:24:12
[DumaOS] DHCP new event., Saturday, June 12, 2021 07:24:12
[DHCP IP: 192.168.1.11] to MAC address 48:b0:2d:09:8a:35, Saturday, June 12, 2021 07:24:12
[DumaOS] Marking device that is marked 192.168.1.3 11 10., Saturday, June 12, 2021 07:23:53
[admin login] from source 192.168.1.30, Saturday, June 12, 2021 07:23:51
[DumaOS] Marking device that is marked 192.168.1.3 11 10., Saturday, June 12, 2021 07:22:59
[DumaOS] Marking device that is marked 192.168.1.3 11 10., Saturday, June 12, 2021 07:22:28
[DumaOS] DHCP lease change., Saturday, June 12, 2021 07:22:25
[DumaOS] DHCP new event., Saturday, June 12, 2021 07:22:25
[DHCP IP: 192.168.1.3] to MAC address 24:20:c7:1c:42:c9, Saturday, June 12, 2021 07:22:25
[DumaOS] Marking device that is marked 192.168.1.3 11 10., Saturday, June 12, 2021 07:22:13
[DumaOS] Marking device that is marked 192.168.1.3 11 10., Saturday, June 12, 2021 07:21:29
[DumaOS] Marking device that is marked 192.168.1.3 11 10., Saturday, June 12, 2021 07:19:59