I started building two months ago — knowing I wouldn't get blazing fast internet connection — so I'm rather new to Debian. Is it possible to efficiently compress data over a private VPN?
I know some iPhone and Android apps like Onavo Extend can achieve that, and I was wondering how I could put this kind of system in place if it is indeed effective enough so that my 4G-data usage would be lighter. If you have any other suggestion on how I could speed up my school's WiFi.
I did some tests on it; ping www. What I found to be a good solution for me was Ziproxy. It's an http compression proxy that is able to compress big html assets, like images, so that webpages are lighter.
As it's a proxy, it works with or without a VPN. It's also very easy to configure. Sign up to join this community. The best answers are voted up and rise to the top.
Home Questions Tags Users Unanswered. Asked 5 years, 7 months ago. Active 1 month ago. Viewed 9k times. Background: I'm a student, and currently the Wi-Fi connection at my school is very slow dead slow.
How to setup and use OpenVPN Connect
I started building two months ago — knowing I wouldn't get blazing fast internet connection — so I'm rather new to Debian Here is my question: Is it possible to efficiently compress data over a private VPN? LaX LaX 2 2 silver badges 12 12 bronze badges. As far as I know l2tp ant pptp both provide compression. If it's not efficient enough for you, try openvpn instead.
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Maybe it can do better. ScylddeFraud Do you have any link on how their compression algorithms compare to each other?
Don't cross-post. LaX: Only this comparission. I don't know if this is the same: unix.Virtually all current web browsers are able to translate compressed HTTP data. The major benefits of compressed traffic include reduced bandwidth costs, WAN latency reduction, and better server performance. NetScaler compression can compress HTML data at a rate of aboutdepending on the type of data being compressed.
Data with heavy formatting compresses well. Compression ratios, however, are not linear with data size. You can see this in the preceding screen shot. Responses that are sent back to clients are compressed, not requests. Virtually all current NetScaler customers using the compression feature have compression enabled in Inline mode, which basically indicates that compression runs at the NetScaler server that is acting as a network traffic manager.
At the highest level, server responses are checked by the NetScaler traffic manager server to see if they contain data that can be compressed. If the data can be compressed, the NetScaler compression engine first compresses the data, and then modifies the response header to indicate the type of compression completed.
The data is then forwarded to the client. The following diagram is an example of an inline compression environment setup:. Alternatively, compression can be enabled on non traffic-manager NetScaler servers.
This method requires the customer to purchase several NetScaler servers. Therefore, the NetScaler traffic manager server forwards the compression work to NetScaler servers set up as pure compression accelerators. The compression engine s on these servers then handle compression duties.
The following diagram illustrates an example of this environment:. To set up this type of compression environment, compression is first configured on the NetScaler server acting as the traffic manager, and then it is set up on the NetScaler server acting as a pure accelerator.
You must enable the feature before configuring it. Run the following command to enable both compression and load balancing feature: enable ns feature lb cmp. Run the following command to bind the services to the load balancing virtual server.
When you want to configure a NetScaler appliance to perform compression on a dedicated NetScaler compression server, run the following commands from the CLI to complete the following tasks. The actual commands are dependent on SSL being configured or not.
This article focuses on SSL enabled virtual servers. Compression policies can be configured to set conditions under which compression is preformed. By default, NetScaler appliance enables several policies when you enable compression at a global level. These policies can also be set to specific virtual servers. Run the show cmp policy command to view all configured compression policies.
It is possible to also create custom policies using expressions and actions.In the past, enterprises have used leased lines over long distances for secure communication between two networks. Typically this is done in order to communicate data, voice, or other traffic between two geographically-separated sites of a company or with a valued business partner.
Leased lines provide dedicated bandwidth and a private link between the two locations. Running leased lines are not always possible or practical for all enterprises and everyday users due to cost, space, and time of installation [ Joha08 ]. Thus, an alternative solution is needed. Virtual Private Networks VPNs were created to address this problem by using the Internet to facilitate communications.
Internet access is cheap; however, it is insecure and often bandwidth limited. VPNs are designed to create secure, encrypted Internet Protocol IP tunnels to communicate between geographically-distant networks across the Internet.
This solution is cost-effective for and available to companies and individuals alike and provides secure access to resources on the remote network. The sections that follow give background information on VPNs, and describe the VPN solution and router used in this case study. Tunneling is a method by which data is transferred across a network between two endpoints. VPNs use tunnels to establish end-to-end connectivity.
A packet or frame destined to a remote network is first encapsulated by adding additional header information and is then sent across the network to the remote endpoint. At the endpoint, the header information is removed and the packet is sent out onto the remote network [ Joha08 ]. This process is shown in Figure 1. Figure 1: VPN tunnel between two endpoints across an network [ Joha08 ]. There are tradeoffs to using a VPN solution compared to dedicated lines.
A VPN offers benefits such as flexibility, transparency, security, and cost. However, it has some drawbacks such as availability and bandwidth [ Kolesnikov02 ].
Are there any kernel changes I could make? This is a CentOS 6. I found some stuff for BSD based but nothing that worked for Linux. I had tried everything, adjusting the MTU, changing the snd and rcv buffers, mss clamping, you name it. CPU load was negligible. On a whim, I disabled compression removed comp-lzo from the client and the server and performance increased x.
Server is a Xeon E, client is Core iM. Both running OpenVPN 2. My Intel Chromebook also maxed out my internet speed. But you've said that's not an option. You could also try the mtu-disc option to automatically discover the optimal MTU settings for your connection. Your tun-mtu setting is massive, as a 65KB packet is going to have a lot of latency issues going through the internet IPv4 jumbo packets are around bytes in size, and mostly work on local networks.
Try something under instead, liketo see if MTU is your issue. Add these lines to your server config ref here. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Asked 6 years, 6 months ago. Active 3 years, 4 months ago. Viewed 64k times. Other ideas? Pinging EDIT: Would setting the fragmentation setting help some? Why not ask your network administrator to open the openvpn port at work?
Theres nothing illegal about it. It's just the only way to access my own systems remotely. I was talking more about bypassing the firewall policy at wherever you are.
Why can't you ask the network administrator to open the port? I was not really talking about the legality, more about circumventing security policy. Active Oldest Votes. Short answer: disable comp-lzo. Will 1, 10 10 silver badges 23 23 bronze badges. Ingenium Ingenium 1 1 silver badge 3 3 bronze badges.
Thanks, that solved my problem with getting a postgresql-query to work over OpenVPN. It worked when querying over a single column, but not for the whole column. Apparently that was caused by the default MTU-Size of GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.
Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. Since OpenVPN 2. Switch to compress option and allow to select alternative compression algorithms.
Note This issue should be tested using a 7. Before starting the testing:. Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Sign up. New issue. Jump to bottom. Labels verified.
Projects NethServer 7. Milestone 7.
Copy link Quote reply. From the man openvpn : --compress [algorithm] Enable a compression algorithm. The algorithm parameter may be "lzo", "lz4", or empty. For backwards compatibility with OpenVPN versions before v2. If the algorithm parameter is empty, compression will be turned off, but the packet framing for compression will still be enabled, allowing a different setting to be pushed later.
Use the newer --compress instead. Proposed solution Switch to compress option and allow to select alternative compression algorithms. Use new 'compression' option This commit was created on GitHub. This comment has been minimized. Sign in to view. Member Author. Before starting the testing: install a clean NethServer 7.
DavidePrincipi closed this Dec 3, Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment. Linked pull requests. You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window.The port number can be configured as well, but port is the official one.
And it is only using that single port for all communication. The PKI consists of:. OpenVPN supports bidirectional authentication based on certificates, meaning that the client must authenticate the server certificate and the server must authenticate the client certificate before mutual trust is established. Both server and client will authenticate the other by first verifying that the presented certificate was signed by the master certificate authority CAand then by testing information in the now-authenticated certificate header, such as the certificate common name or certificate type client or server.
This will ensure that any changes to the scripts will not be lost when the package is updated. From a terminal change to user root and:. Enter the following to generate the master Certificate Authority CA certificate and key:. As in the previous step, most parameters can be defaulted. Two other queries require positive responses, "Sign the certificate? The VPN client will also need a certificate to authenticate itself to the server.
Usually you create a different certificate for each client. To create the certificate, enter the following in a terminal while being user root:. As the client certificates and keys are only required on the client machine, you should remove them from the server.
Along with your OpenVPN installation you got these sample config files and many more if if you check :. That is the minimum you have to configure to get a working OpenVPN server. You can use all the default settings in the sample server. Now start the server. You will find logging and error messages in your via journal.
Server Fault is a question and answer site for system and network administrators. It only takes a minute to sign up. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Asked 11 months ago. Active 11 days ago. Viewed 2k times. I want to enable OpenVPN compression lz4-v2 in server configuration file server. Active Oldest Votes.
Put compress lz4-v2 in client. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Socializing with co-workers while social distancing. Podcast Programming tutorials can be a real drag.