SSH timing out

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kevindd992002

Member
Dec 20, 2023
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So the original setup of my pve was that it only had one Linux VLAN with the ff ip config:

vmbr.25
IP/CIDR: 192.168.25.2/24
Gateway IP: 192.168.25.1

When I SSH from a client in the 192.168.20.0/24 network to 192.168.25.2:22, obviously it goes through the router (opnsense) and everything is working fine.

Now, I decided to multi-home my pve with the ff Linux VLANs and ip config:

vmbr.20
IP/CIDR: 192.168.20.2/24
Gateway IP: NO GATEWAY

vmbr.21
IP/CIDR: 192.168.21.2/24
Gateway IP: NO GATEWAY

vmbr.23
IP/CIDR: 192.168.23.2/24
Gateway IP: NO GATEWAY

vmbr.25
IP/CIDR: 192.168.25.2/24
Gateway IP: 192.168.25.1

My problem is whenever I SSH from the same client in the 192.168.20.0/24 network to 192.168.25.2:22, it connects just fine but will timeout after maybe 30 seconds to 1 minute (I haven't timed it yet). I can reproduce this everytime.

When I SSH from the same client to 192.168.20.2:22 instead (source and destination in the same network), I have no issues. Obviously, this is not layer 3 so the router is out of the question in this case.

Thoughts?
 
if you use an Ubuntu 24.04 client and open a terminal to connect to a server and then the connection is terminated after an indefinite period of time.
Take a look at “sudo dmesg -w” in the other terminal on the client.
I have errors that are disconnecting me.
But I don't have that on an Ubuntu 22.04.
Could therefore also be a client problem.
 
apreussner said:
if you use an Ubuntu 24.04 client and open a terminal to connect to a server and then the connection is terminated after an indefinite period of time.
Take a look at “sudo dmesg -w” in the other terminal on the client.
I have errors that are disconnecting me.
But I don't have that on an Ubuntu 22.04.
Could therefore also be a client problem.
Click to expand...
I actually use Putty in Windows. The timeout happens literally a few seconds after logging in. When this happens and I key in any input from the keyboard, I get this:

Network Error: Software caused connection abort​


While I'm trying to recreate this issue, I have a cmd window open and a continuous ping to the same 192.168.25.2 address. I don't see any disconnects. So this problem is isolated to SSH and not the whole network of the pve.
 
You can install mtr on windows and use it to create a live traceroute to your IP.
mtr -t 192.168.xx
To me it sounds like a response packet is not being sent over the same route or network connection. and then the connection is terminated.
 
apreussner said:
You can install mtr on windows and use it to create a live traceroute to your IP.
mtr -t 192.168.xx
To me it sounds like a response packet is not being sent over the same route or network connection. and then the connection is terminated.
Click to expand...
If it was asymmetric routing, why would ping not drop?
 
I just found out that the Linux VLAN's that I added is what's causing the issue. Maybe because of the asymmetric routing that you were saying but don't understand why. Any ideas?
 
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