 can receive and send data faster.
Saves Bandwidth – No error correction is involved with UDP. Even if the data packets are lost on the way, retransmission isn’t done. This saves you a lot of bandwidth.
Having high speed is good, but at what cost? Now let’s check the disadvantages of UDP.
Unreliable Connection – There are no handshaking dialogs done here either prior to establishing a connection or in managing the connection. So, the connection is unreliable, and you’re exposed to threats in the underlying network.
Loss of data packets – Successful delivery of the datagrams and ordering isn’t guaranteed in UDP. This is why we say that there are no error-correction facilities. You may experience data loss, but they won’t be retransmitted as they are in TCP.
Less Compatibility – In internet-censoring countries, VPN traffic is blocked. The OpenVPN connections over UDP may fail, as they’re restricted, and it won’t be easy to bypass firewalls with it.
As should now be apparent, there are consequences of going with a speedy connection with UDP. Unless you’re looking for higher performance and a fast protocol, it might be better to go with TCP.
Unlike TCP datagrams, UDP datagrams contain no sequence number to order the packets received. So users are likely to use other applications and UDP to reorder the data packets.
However, if you’re interacting with real-time services such as gaming, live conferences, and VoIP, switching to UDP is better. That way, it won’t process delayed data, ensuring that you enjoy high performance.
Again, it depends on your requirements.
There’s a tradeoff between reliability and speed. For instance, if speed is your primary concern, UDP is your best option. Streaming HD movies and playing games online are much more manageable with UDP.
If you prefer reliability, then go with TCP. You may experience slower data transmission, but TCP is used with many internet services and therefore trusted by many.
You can also switch to TCP, abandoning the default UDP configurations when you experience connection problems.
However, change ports before hitting your protocol, as the connection type doesn’t cause many connectivity problems but because the ISP is blocking the VPN ports.
The slow transmission in TCP may also depend on how far you are from the VPN server. If you select the VPN server nearest you, the slow connections will drop considerably.
2. Select your preferred protocol.
Running OpenVPN over TCP brings extra advantages as well. This is about how to defeat government censorship with TCP port 443.
Many of us know that some countries, such as China, love to censor the internet and track citizens’ internet traffic. These governments block sites that don’t abide by their policies or share their beliefs.
Fortunately, if you use OpenVPN over TCP, it would be nearly impossible for the government to stop you. This is why many people use VPNs: to bypass government firewalls. As these governments are aware of this countermeasure, they block VPNs, too.
You may have seen that secure websites start their URLs with HTTPS://. They use SSL or Secure Socket Layer, a standard security technology, to encrypt the data transmitted between a server and a user. Nowadays, almost all websites use SSL.
Due to the high prevalence of SSL, websites that use this technology are believed to be unblockable. Even China may find it challenging to block them.
As OpenSSL libraries are used in building OpenVPN, configuring TCP to run with port 443 is a piece of cake. But this isn’t the most exciting part. The best part is that SSL uses not just any protocol and port but the TCP protocol on port 443.
So, when the VPN uses OpenVPN over TCP on port 443, your VPN traffic seems like regular SSL traffic. There’s no way to identify the data, as they’re encrypted.
Running OpenVPN over TCP port 443 will significantly increase your overall security and the strength of your digital defense.
TCP is the dominant protocol for as long as it provides guaranteed delivery of data packets, reliability, error correction, and much more.
But keep in mind the costs: latency and additional overhead. Even VPN providers use UDP as their default configuration, although unreliable and connectionless.
Choosing what’s ideal for you doesn’t have to be complicated. It just depends on whether you prioritize speed or whether you prioritize reliability.
I so enjoyed your words and ability to talk to the “common human”. For me, it is overwhelming to try to find a logical choice as so many sites just leave me flummoxed on what to do. I could or wish I could ask a few questions but I will try and just ask one. I started my research thinking I would get a mobile VPN, like Express VPN or Proton etc. I fell down a rabbit hole learning about DD-wrt home routers. Why? My reading just kept saying this protects my data, my phones, computers in the best way. I live in Seattle, Wa and currently use the router provided by Comcast. Can you imagine a scenario where I have a home VPN and then when I walk out the door I am using ExpressVPN? Is that the gold standard. Also, while I am deeply fascinated by cyber security, I am fearful of not having the mental acumen to make all this merge together. I am willing to pay for the breadth of security, but need the software/hardware to be user friendly 🙁 or maybe I can find a support group or online tech to talk with. This may not reach you and I understand. I also know the answer to everything in life is often, “ it depends :).” Thanks for your work to help all of us security 101 folks! Best to you and your team.
The HVAC Salesperson is a highly motivated and self-driven individual who is responsible for the overall success and sales of the company. This position will estimate and sell residential HVAC Services and Equipment in the Central Arkansas and surrounding areas. This Salesperson will work in conjunction with the Sales Manager/Department.
Must be able to perform estimates and sell HVAC Systems and Services.
Must be able to troubleshoot HVAC jobs.
Follow sales objectives and goals including sales targets, margin requirements, and business development.
Produce business growth by presenting HVAC products and services either through customer leads or self-generated leads.
Perform load calculations and other technical requirements in support of equipment recommendations and utility rebate requirements.
Participate in on-going training and education programs for the Sales Team.
Process sales agreements and job paperwork, including permits for jobs and utility rebates.
Maintain a competitive advantage by learning about competitors’ activities and share with the Sales Team.
Run heat loads.
Have a general understanding of the different sizes and pricing of HVAC equipment.
Be familiar with the Arkansas State Mechanical Code.
Provide follow-up visits with customers as needed.
Generate leads while in the home and periodically attending Lead Generator groups/events.
Be in constant communication with the Residential Installers to ensure excellent customer service is achieved.
Perform all printed and digital paperwork.
Be familiar with how to use an iPad, Tablet, etc.
Work in accordance with Federal, State, and Local Requirements.
Perform other duties as assigned by Sales Manager.
5+ years of outside sales experience.
5+ Years of estimating/selling HVAC equipment and services is mandatory.
Extensive face-to-face selling experience.
Excellent track record of securing and maintaining new business.
Strong negotiation skills with the ability to influence and drive decisions to finalize the sale.
Excellent customer service skills, a positive attitude, great people skills, and excellent communicator.
Must be able to lift 50 pounds regularly and up to 75 pounds occasionally.
Q: Initializing a constant structure I would like to create a constant structure in flash. This structure would consist of various sized elements including string arrays, shorts, bytes, etc. Strings should be null terminated, but may not entirely fill the array storage area allocated for it. The code shown below is what I have, but the compiler gives the following error.
../Source/flash_constants.h:1025:33: error: expected ':', ',', ';', '}' or '__attribute__' before '=' token
   const unsigned char Reg00[32] = "My String 1";

The       const unsigned char Reg00[32] = "My String 1"; is a valid statement outside of the struct definition, but fails inside the struct definition.
Thanks.
struct
{
  const unsigned char Reg00[32] = "My String 1";
  const unsigned char Reg01[32] = "My String 2";
  const unsigned char Reg02[32] = "My String 3";
  const unsigned short Reg03 = 0;
  const unsigned short Reg04 = 0;
} ModBusIDReg;


A: You can not do inline initialization of structures in C.
You need to define the structure, define the variable, and then initialize the variable:
struct
{
  const unsigned char Reg00[32];
  const unsigned char Reg01[32];
  const unsigned char Reg02[32];
  const unsigned short Reg03;
  const unsigned short Reg04;
} const ModBusIDReg = {
    "My String 1",
    "My String 2",
    "My String 3",
    0,
    0
};


A: You can also use the designated initializers(C99) which don't