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HVAC Systems: A Beginner's Quick Handbook to Essential Success

Posted by Rick Taylor on May 10, 2024 at 10:46pm 0 Comments

Heating, ventilation, and air conditioning (HVAC) systems play a pivotal role in maintaining comfort and air quality in residential, commercial, and industrial settings. From regulating temperature and humidity to ensuring proper airflow, HVAC systems are complex networks of components working together seamlessly. In this article, we delve into the intricacies of HVAC systems, exploring their functionality, components,… Continue

 

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PC --- PPPoE Server (Ubuntu) --- Internet.
Step #4: Set PPPoE Scripts.
How to create a PPPoE Server on Ubuntu?
Step #5: Automatically start/stop PPPoE Server.
That’s it! Once that’s completed, then the PPPoE Server will boot up automatically and start handling traffic.
Step #3: Setup PPPoE Settings.
Last of all, setup the IP addresses to lease for the PPPoE Server. We’re giving IP addresses 172.32.50.2 to 172.32.50.30:
Step #2: Install PPP and RP-PPPoE.
One note: make sure that the file has the correct permissions. Sometimes the PPPoE Server won’t start if the file isn’t restricted enough. A simple chmod command will do here:

First of all, the topology needs to be setup as followed:
> sudo apt-get install ppp.
For complete purposes, below is a stop script to nicely tear down the PPPoE Server and revert any changes.
> sudo chmod 600 /etc/ppp/chap-secrets.
You will need to install these components to get the PPPoE Server working. The first one is simple: just grab the ppp package from Ubuntu:
Step #1: Topology Setup.
We are ready to start PPPoE Server. Several things to worry about: the firewall needs to be set properly so that the PPPoE Server will be able to transfer traffic from one interface to the other, and IP forwarding needs to be enabled. Since these options will have to set every time Ubuntu reboots, they’re part of the start PPPoE script. It’s placed under /etc/ppp/start_pppoe.
The second package (rp-pppoe) requires you to build it on your own. Start by grabbing the package from this website (Roaring Penguin)
If you cannot access this, check your interface. Most likely something is misconfigured there. There are several guides on how to enable your interface properly: – Network Configuration.
Troubleshooting.
Usually, there’s always some sort of issue getting the PPPoE Server working. I found that using wireshark makes it easier to debug the situation. However, usually the interface (eth1) isn’t up for wireshark to sniff. Make the modifications below to bring up the interface without assigning an IP address to it:
You can add your typical cable modem and/or router into the mix. The main issue here is to ensure that your PPPoE Server can access the Internet without any problems. To verify this, just do a quick ping test to google.com or yahoo.com.
Several files need to be created before we can start PPPoE Server. First, modify the /etc/ppp/pppoe-server-options and change it to the following:
All we have to do is add them into the /etc/network/interfaces so that once the computer boots and detects the interface is connected, it’ll boot up the PPPoE Server. The PPPoE Server resides in eth1 in this example below:
Next, add a username into the correct secrets file. Since we’re using require-chap, we will add it into /etc/ppp/chap-secrets. The syntax is simple: follow the example below to add a user (alice) with a simple password (1234).
#comment: code snippets.
The -m option for pppoe-server is needed so that the packets don’t go beyond MTU size after the PPPoE header is attached.
For one reason or another, I needed to setup a PPPoE Server on my Ubuntu machine. Unfortunately almost all the guides found were talking about setting a PPPoE client connected to a PPPoE Server. So I spend a few days testing and trying out different configurations, until I finally found how to set it up from scratch. The below instructions will look similar to the guide I referenced, but there are some extra steps to ensure that your connection will be able to access Internet properly.
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