I am using Puppet PE 2017.3.5.0-1 on a CentOS7 AWS instance. When I SSH into this machine, to a default installation, I am getting limited to two connections only. When I try to connect again (from a 3rd terminal) the connection is closed automatically. I’m not able to connect more than twice at the same … Read more
I’m trying to create a setup where one could “ssh” to a specific port on localhost and then get forwarded to a remote server and into a shell, without the need to enter credentials (nope, secret key is not an option, unfortunately). So far I have set up ssh multiplexing, with ControlMaster, so I can … Read more
I am connecting to a VPN whose gateway is sufficiently misconfigured that basically the only useful thing I can do with it is to ssh to a specific Linux host set up for my usage inside the VPN, and then use that host as a terminal. (Neither scp nor ssh port forwarding nor ssh proxying … Read more
Starting a few weeks ago, at seemingly random intervals, 3 of 5 PCs will lag at the same time for a few seconds to the extent where mouse and keyboard input is delayed and VoIP calls are dropped. After ruling out a few potential root causes, I suspected that something on the network was causing … Read more
I am reading this article and it talks about Multiplexing at the Transport Layer of the OSI model. I can’t seem to find out what it means with ‘multiplexing’ at that layer? As multiplexing is a signal process, and at the Transport Layer, we’re not concerned directly with signals. Can anybody provide me with an … Read more
How is frequency multiplexing implemented? I understand that in time division multiplexing the feed of each channel just uses its own time interval for sending out data over the same medium. But how can you mix different frequencies into a single medium? Wouldn’t that just cause static ie: “white-noise”. Answer Assuming this is in the … Read more
I have a list of nodes, that are accessible only through a bastion server. On these nodes, I would like to execute commands in parallel. So, I had been trying to use ssh -J flag or, respectively, the ssh_config ProxyJump option in combination with parallel ssh pssh. To speed up re-connections, I am using ssh … Read more
Background: ssh (client) allows the re-use of active connections via multiplexing ControlPaths … Host * ControlMaster auto ControlPath /home/username/.ssh/%r@%h:%p the TL;DR is the first connection will authenticate like any other, subsequent connections will use the controlpath and not perform any additional authentication. Now my question; is it possible to limit the use of such connections … Read more
I have a situation where a large batch of servers (X), on demand, need to request data from a smaller set of web servers (Y). The worst case scenario is if all servers in X decide to fetch different requests to one server in Y. That would be X amount of connections, which could be … Read more
I’m trying to create multiplexed ssh connections for a series of commands that run in succession, then after the series of commands is finished, close the multiplex session. According to the documentation, the first connection should start the control master: ssh -o “ControlMaster=auto” -S /home/justin/.ssh/sockets/multiplex_ssh.sock justin@1.2.3.4 “uptime” Then the rest of the commands just need … Read more
