Ssh tunnel

Sep 30, 2019Download as PPTX, PDF1 like813 views

SSH tunneling creates an encrypted connection between a local computer and a remote computer through which network traffic can be relayed securely. There are three main types of SSH tunnels: dynamic port forwarding, local port forwarding, and remote port forwarding. Dynamic port forwarding makes remote resources accessible on the local system by creating a SOCKS proxy. Local port forwarding also makes remote resources accessible locally by binding a local port that redirects traffic to the remote server. Remote port forwarding exposes local resources on the remote system, allowing access from outside the local network. SSH tunnels provide strong authentication and encryption to securely access systems and resources over insecure networks.

Topics
● SSH
● SSH Tunnels
● Types of SSH Tunnels
● Practical
● Benefits & Alternatives

Secure Socket Shell (SSH)
SSH is a network protocol that provides administrators with a secure way to access a
remote computer.
Secure Shell provides strong authentication and secure encrypted data communications
between two computers connecting over an insecure network such as the Internet.
ssh username@ipaddress

Install SSH
In Debian System
sudo apt-get install openssh-server openssh-client

How SSH works
SSH
Client
SSH
Server
Terminal
Application
22
Local Machine
My Computer
Remote Machine
gitlab.xxx.com

Scenario
My System
Internet
Pub IP: 202.164.44.245
Pvt IP: 192.168.1.178
gitlab.xxx.com Internal System
Pvt IP: 192.168.1.18
Private Network

SSH tunneling (also called SSH port forwarding)
SSH has a feature called SSH tunnelling (or SSH port forwarding).
SSH Tunnel creates an encrypted connection between a local computer and a remote
computer through which you can relay traffic. It is very useful, and you can use it to
securely access unencrypted protocols such as VNC or firewalled resources like database
servers.

Types of SSH Tunneling
● Dynamic Port Forwarding
● Local Port Forwarding
● Remote Port Forwarding

Dynamic Port Forwarding(Make Remote Resources
Accessible on Your Local System)
● It creates SOCKS Proxy in Client side
● All client application(browser) are configured to SOCKS proxy settings
● What are the contents sent to that port is transparently redirected, encrypted to
remote server
● Response from remote machine is received in same way

Dynamic Tunnel
ssh -D 8080 amandeep@gitlab.xxx.com
In windows we can use open source software Putty to create tunnel
Local Port

Dynamic Port Forwarding
SSH
Client
SSH
Server
22
(Encrypted)
My Machine gitlab.xxx.com
SOCKS
Proxy
Any
Application
like browser
*
Any
Application
8080
http://localhost/
http://localhost/

Local Port Forwarding(Make Remote Resources
Accessible on Your Local System)
● In client side we bind one port
● What are the contents sent to that port is transparently redirected, encrypted to
remote server
● Response from remote machine is received in same way

Local port forwarding tunnel
ssh -L 8000:192.168.1.26:80 amandeep@gitlab.xxx.com
In windows we can use open source software Putty to create tunnel
Local Port Remote Port

Local Port Forwarding
SSH
Client
SSH
Server
22
(Encrypted)
My Machine gitlab.xxx.com
Any
Application
*
8000
http://localhost:8000
http://localhost/
192.168.1.26

Remote Port Forwarding: Make Local Resources
Accessible on a Remote System
● “Remote port forwarding” is the opposite of local forwarding, and isn’t used as
frequently.
● It allows you to make a resource on your local PC available on the SSH server.
● For example, let’s say you’re running a web server on the local PC you’re sitting in
front of. But your PC is behind a firewall that doesn’t allow incoming traffic to the
server software.

SSH Tunnel
Internet
gitlab.xxx.com Any SSH Client
SSH ServerSSH Client
This is what we have implemented on Bigrox to make Raspberry Pi accessible through SSH
server
Raspberry Pi

Remote port forwarding tunnel
ssh -R 5002:localhost:22 amandeep@gitlab.xxx.com
In windows we can use open source software Putty to create tunnel
Remote Port Local Port

Benefits
● Explore the resources which are behind the firewall.
● Expose local servers to the internet.
● System administrators and IT professionals use it for opening backdoors into the
internal network from their home machines.
● Other free alternatives
- Ngrok
- Serveo

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Artificial intelligence is changing how businesses operate. Companies are using AI agents to automate tasks, reduce time spent on repetitive work, and focus more on high-value activities. Noah Loul, an AI strategist and entrepreneur, has helped dozens of companies streamline their operations using smart automation. He believes AI agents aren't just tools—they're workers that take on repeatable tasks so your human team can focus on what matters. If you want to reduce time waste and increase output, AI agents are the next move.

Electronic_Mail_Attacks-1-35.pdf by xploitniftliyevhuseyn

How Can I use the AI Hype in my Business Context?Daniel Lehner

𝙄𝙨 𝘼𝙄 𝙟𝙪𝙨𝙩 𝙝𝙮𝙥𝙚? 𝙊𝙧 𝙞𝙨 𝙞𝙩 𝙩𝙝𝙚 𝙜𝙖𝙢𝙚 𝙘𝙝𝙖𝙣𝙜𝙚𝙧 𝙮𝙤𝙪𝙧 𝙗𝙪𝙨𝙞𝙣𝙚𝙨𝙨 𝙣𝙚𝙚𝙙𝙨? Everyone’s talking about AI but is anyone really using it to create real value? Most companies want to leverage AI. Few know 𝗵𝗼𝘄. ✅ What exactly should you ask to find real AI opportunities? ✅ Which AI techniques actually fit your business? ✅ Is your data even ready for AI? If you’re not sure, you’re not alone. This is a condensed version of the slides I presented at a Linkedin webinar for Tecnovy on 28.04.2025.

Special Meetup Edition - TDX Bengaluru Meetup #52.pptxshyamraj55

Manifest Pre-Seed Update | A Humanoid OEM Deeptech In Francechb3

HCL Nomad Web – Best Practices und Verwaltung von Multiuser-Umgebungenpanagenda

Webinar Recording: https://www.panagenda.com/webinars/hcl-nomad-web-best-practices-und-verwaltung-von-multiuser-umgebungen/ HCL Nomad Web wird als die nächste Generation des HCL Notes-Clients gefeiert und bietet zahlreiche Vorteile, wie die Beseitigung des Bedarfs an Paketierung, Verteilung und Installation. Nomad Web-Client-Updates werden “automatisch” im Hintergrund installiert, was den administrativen Aufwand im Vergleich zu traditionellen HCL Notes-Clients erheblich reduziert. Allerdings stellt die Fehlerbehebung in Nomad Web im Vergleich zum Notes-Client einzigartige Herausforderungen dar. Begleiten Sie Christoph und Marc, während sie demonstrieren, wie der Fehlerbehebungsprozess in HCL Nomad Web vereinfacht werden kann, um eine reibungslose und effiziente Benutzererfahrung zu gewährleisten. In diesem Webinar werden wir effektive Strategien zur Diagnose und Lösung häufiger Probleme in HCL Nomad Web untersuchen, einschließlich - Zugriff auf die Konsole - Auffinden und Interpretieren von Protokolldateien - Zugriff auf den Datenordner im Cache des Browsers (unter Verwendung von OPFS) - Verständnis der Unterschiede zwischen Einzel- und Mehrbenutzerszenarien - Nutzung der Client Clocking-Funktion

How analogue intelligence complements AIPaul Rowe

Artificial Intelligence is providing benefits in many areas of work within the heritage sector, from image analysis, to ideas generation, and new research tools. However, it is more critical than ever for people, with analogue intelligence, to ensure the integrity and ethical use of AI. Including real people can improve the use of AI by identifying potential biases, cross-checking results, refining workflows, and providing contextual relevance to AI-driven results. News about the impact of AI often paints a rosy picture. In practice, there are many potential pitfalls. This presentation discusses these issues and looks at the role of analogue intelligence and analogue interfaces in providing the best results to our audiences. How do we deal with factually incorrect results? How do we get content generated that better reflects the diversity of our communities? What roles are there for physical, in-person experiences in the digital world?