About proxy servers – IU KB
A proxy server, also known as a “proxy” or “application-level gateway”, is a computer that acts as a gateway between a local network (for example, all the computers at one company or in one building) and a larger-scale network such as the internet. Proxy servers provide increased performance and security. In some cases, they monitor employees’ use of outside resources.
A proxy server works by intercepting connections between sender and receiver. All incoming data enters through one port and is forwarded to the rest of the network via another port. By blocking direct access between two networks, proxy servers make it much more difficult for hackers to get internal addresses and details of a private network.
Some proxy servers are a group of applications or servers that block common internet services. For example, an HTTP proxy intercepts web access, and an SMTP proxy intercepts email. A proxy server uses a network addressing scheme to present one organization-wide IP address to the internet. The server funnels all user requests to the internet and returns responses to the appropriate users. In addition to restricting access from outside, this mechanism can prevent inside users from reaching specific internet resources (for example, certain websites). A proxy server can also be one of the components of a firewall.
Proxies may also cache web pages. Each time an internal user requests a URL from outside, a temporary copy is stored locally. The next time an internal user requests the same URL, the proxy can serve the local copy instead of retrieving the original across the network, improving performance.
Do not confuse a proxy server with a
NAT (Network Address Translation) device. A proxy server connects to, responds to, and receives traffic from the internet, acting on behalf of the client computer, while a NAT device transparently changes the origination address of traffic coming through it before passing it to the internet.
For those who understand the OSI (Open System Interconnection) model of networking, the technical difference between a proxy and a NAT is that the proxy server works on the transport layer (layer 4) or higher of the OSI model, whereas a NAT works on the network layer (layer 3).
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Last modified on 2018-11-15 11:25:00.
What Is A Proxy Server? | PCMag
A proxy server is a computer system or router that functions as a relay between client and server. It helps prevent an attacker from invading a private network and is one of several tools used to build a firewall.
The word proxy means “to act on behalf of another, ” and a proxy server acts on behalf of the user. All requests to the Internet go to the proxy server first, which evaluates the request and forwards it to the Internet. Likewise, responses come back to the proxy server and then to the user.
Proxy Servers Provide Anonymity
Like a virtual private network (VPN), a proxy server hides the user’s IP address when accessing the Internet. See VPN and TLS.
Address Translation and Caching
The proxy server is a dual-homed host with two network IP addresses. The address on the outbound side is the one the Internet sees. Proxies are often used in conjunction with network address translation (NAT), which hides the users’ IP addresses on the internal network. Proxy servers may also cache Web pages so that the next request for that page can be retrieved much faster. See NAT and proxy cache.
Anonymous proxy servers let users surf the Web and keep their IP address private (see anonymous proxy). Although not specifically called proxies, Internet email (SMTP) and the Usenet new system (NNTP) are somewhat similar because messages are relayed from sender to recipient. See firewall.
Application Level and Circuit Level
“Application-level” proxies or “application-level gateways” are dedicated to specific content such as HTTP (Web) and FTP (file transfer). In contrast, a “circuit-level” proxy supports every application (see SOCKS).
Forward and Reverse Proxies
In this definition, the proxy servers are “forward proxies” that hide the details of the clients from the servers. However, proxies can also reside at the website to hide details from the clients (see reverse proxy).
A Proxy Server in a LAN
In this example, the proxy server functions as a firewall in the public side of a company network, which is called the “demilitarized zone” (see DMZ).
Proxy vs. VPN: 4 differences you should know – Norton
Worried about your privacy when searching the Internet? Wondering if hackers, government agencies, or companies can track what sites you visit, files you download, or links you click?
You might be wondering if it’s time to sign up with a virtual private network (VPN) or proxy server to hide your location and internet-service-provider address from any snoops.
But be aware: There are significant differences between a proxy and a VPN. While both tools can protect your identity, only a VPN will encrypt your data as you browse the web.
This means that only a VPN can help hide your online activity from hackers, government agencies, and companies that might be looking to learn more about how you spend your time on the internet.
What VPNs and proxy servers are
Both VPNs and proxy servers are tools you can use to help keep your activity private when browsing the internet, sending emails, reading online message boards, streaming video, and downloading files. But both of these tools work in different ways.
A proxy server is a computer that sits between you and a server, acting as a gateway when you access the internet. When you connect to a specific website, video-streaming app, or file-sharing program from your laptop, tablet, smart phone, or any other device, you can first connect to a proxy. Once you do this, you’ll be connecting to the site or app through an outside host server.
There’s a clear benefit to this if you want to hide your identity. The website you are visiting — or the streaming service you are accessing or file-sharing site you are using — will only see the IP address belonging to the proxy server. It won’t see your address. This will keep your identity and true location hidden from these sites and apps.
There are different types of proxies. Here are three of the most common ones.
You’d use these proxies to access websites. You can also use this type of proxy to access geo-restricted content. For instance, maybe an online video is restricted in your region. You can use a proxy server to log onto the site hosting the video, hiding the fact that your original IP address is restricted from watching it. Keep in mind, this may violate the user agreement with your content provider.
These proxies don’t work only on websites. You can use a SOCKS5 proxy to access video streaming services, file-sharing sites, or online games. Be aware, though, that connecting to an app through a SOCKS5 proxy might be slower because free proxies can have less configuration options, support, and slower infrastructure.
You might have used a transparent proxy without realizing that. That’s the whole point. Employers — or parents, schools or libraries — might set up a transparent proxy as a way to filter user’s content when they connect to the internet or block users from accessing certain websites.
A VPN is similar to a proxy, but instead of working with single apps or websites, it works with every site you visit or app you access.
Like a proxy, when you visit a website after first logging into a VPN, your IP address is hidden and replaced with the IP address of your VPN provider. This keeps your identity shielded. But unlike a proxy, this protection will remain in place as you surf to new websites, visit online streaming sites, or send emails or download files.
You can access the internet through free VPN providers. But providers that charge for VPN access are less likely to share data with third parties.
How VPNs and proxies differ
Here are four ways VPNs and proxies are different.
1. VPNs encrypt your information
The biggest benefit of a VPN over a proxy server? With VPN enabled, your browsing and any data you send or receive, will be encrypted. This is important: It means that hackers, government agencies, businesses, or anyone else won’t be able to see what you’re doing when online.
Say you access your online bank account while using a VPN. Because your information is encrypted, hackers won’t be able to access your bank account numbers. The same is true if you log onto your credit card provider’s online portal: Because your data is encrypted, criminals won’t be able to snag your credit card number or the password you use to log onto the portal.
2. VPN providers promote online privacy
If you want total privacy, work with a VPN provider that has a no-log policy. “No log” means the providers pledge not to track and store your activity while you are using the service to connect to the internet. This means that these providers won’t have any data to give to anyone else who wants information about what sites you browse or files you share. On the other hand, a free proxy may monitor traffic and sell data to third-parties.
3. Free proxy connections can be slower
Both proxy servers and VPNs can slow down your browsing, depending on how many users are accessing these services. Free proxy connections however can be slower and less secure because of less support, less configuration options, and slower infrastructure.
4. You may spend more with a VPN
You can connect through free VPNs. However, many tech experts recommend going with a VPN provider that charges a fee because paid services often offer more data privacy, more secure connections, and more reliable performance. Security of free VPN can be unreliable, as many providers use only one VPN connection, called point-to-point tunneling protocol (PTTP). A paid VPN service, on the other hand, can offer users data encryption which is more secure.
Do you need a proxy if you have a VPN?
No. A VPN and proxy server both mask your IP address. But a VPN will also encrypt the data you send and receive, something that a proxy server doesn’t do. If you are already using a VPN, then, connecting to a website or app through a proxy server would be an unnecessary step.
What should you use, a VPN or proxy server?
When it comes to proxy vs. VPN and which one to use, the differences between the two might help you decide what’s the best choice for you.
If you want to hide your IP address, using either a proxy server or VPN will work. And if you’re worried about browsing speed, and you’re only worried about hiding your IP address from a single site or app, then a free proxy server will do the job.
If cost is an issue, then connecting to single sites, apps, or file-sharing services through a proxy server might be the smart move. It’s easy to find free proxy servers that will hide your IP address.
But if you want to keep your browsing activity hidden from snoops, logging onto the internet through a VPN is the better choice. Again, it comes down to encryption: VPNs encrypt your data while online. Proxy servers don’t.
If you plan to access several sites while online, especially if you’re connecting to sites such as your bank account or credit card portal, a VPN provides more security.
And while many of the preferred VPN providers will charge for their services, this price might be a small one to pay if it means that your most sensitive personal and financial information is shielded from the eyes of online snoops.
Frequently Asked Questions about proxies meaning
What proxy means?
1. Proxy is a stand-in for someone else, the authority to stand-in for or represent someone else, or a document giving permission for someone else to vote on your behalf. An example of proxy is someone who is named to make health care decisions for you if you are unable to do so.
What is proxy example?
Some proxy servers are a group of applications or servers that block common internet services. For example, an HTTP proxy intercepts web access, and an SMTP proxy intercepts email. A proxy server uses a network addressing scheme to present one organization-wide IP address to the internet.Nov 15, 2018
What does proxy mean in software?
P. A proxy server is a computer system or router that functions as a relay between client and server. It helps prevent an attacker from invading a private network and is one of several tools used to build a firewall. The word proxy means “to act on behalf of another,” and a proxy server acts on behalf of the user.