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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...
> It's simple: I have <pc1> and <pc2> (it's 192.168.1.30 and 192.168.1.2
> but what's the point ?).
It's _not_ simple. As I always say, "Everything's complicated."
> From a shell prompt in <pc1>, ssh <pc2> [...]
Which part of "actual actions (commands)" was unclear? What, exactly
is "<pc2>"?
> [...] Especially when using a command-line program, copy+paste is your
> friend.
Still true.
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.
Even if only network interface is active at a time, if it gets its
address (and other parameters) using DHCP, then I'd expect each
interface to get a unique IP address, because each interface has its own
unique MAC address.
I still know nothing about the XR500, but its User Manual suggests
that the Device Manager in its management web site will report on the
attached devices. I'd look closely at that report when you switch
between Ethernet and wireless on one of your <pcX> systems.
> [...] it's just stuck [...]
How long did you wait? Give it a few minutes, not only a few
seconds?
> [...] I don't know why. [...]
I knew that. That's why we're here.
> [...] What else can I say ? [...]
You could answer the questions as asked, with "actual actions
(commands) with their actual results (error messages, [...]", and not
simplify, generalize, or pre-analyze anything.
> [...] And by the way, that did not solve the problem either.
I doubt that the "NetDuma Partner" fellow in that other thread
actually believed that that setting made any difference...
> [...] I would not have guessed that would have affected it but happy
> you managed to resolve it!
...but if the user is happy, it's easier to stop troubleshooting than to
try to find out what actually happened. Few people have the patience
and discipline to change only one thing at a time, so a statement like
"I did X, and now it works" can be misleading.
Everything's complicated.
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).
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
There is no solution. The wifi blocks the ssh connections (from outside, it's normal) but even on the local network between local computers, for security reasons. It's the answer of the technical support. It's quite ridiculous : the ISP boxes allow ssh connections even by wifi on the local network between local computers. Nothing can be changed in the configuration menu. I have to use another firmware if I want to unlock the problem.
Well, it's not the solution because by configuring the NightHawk XR5000 like a wifi access point plugged in my box, I can use ssh connexions by wifi without problems... Like just right now...
I don't use an XR router with DumaOS, but on my R7800 and smartphone on WiFi I don't have issues connecting Smartphone -> Local Server and Desktop over SSH -- all run on openSUSE Linux. There must be something in DumaOS that blocks this
