Since Python 3.3 there is an ipaddress module in the stdlib that you can use. >>> import ipaddress >>> ipaddress.ip_address(‘192.168.0.1’).is_private True If using Python 2.6 or higher I would strongly recommend to use a backport of this module.
const char *opt; opt = “eth0”; const len = strnlen(opt, IFNAMSIZ); if (len == IFNAMSIZ) { fprintf(stderr, “Too long iface name”); return 1; } setsockopt(sd, SOL_SOCKET, SO_BINDTODEVICE, opt, len); First line: set up your variable Second line: tell the program which interface to bind to Lines 3-5: get length of interface name and check if … Read more
It will be split when it hits a network device with a lower MTU than the packet’s size. Most ethernet devices are 1500, but it can often be smaller, like 1492 if that ethernet is going over PPPoE (DSL) because of the extra routing information, even lower if a second layer is added like Windows … Read more
This means the other side is using another version of TLS and you are using an older version. Set up security attribute to TLS12 before making the connection. This is a widely known problem, as many providers start using TLS12 (e.g. paypal,amazon and so on). ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
Looks like this was added in Kernel 2.6.37. Commit diff from kernel Git and Excerpt from change log below; commit dca43c75e7e545694a9dd6288553f55c53e2a3a3 Author: Jerry Chu Date: Fri Aug 27 19:13:28 2010 +0000 tcp: Add TCP_USER_TIMEOUT socket option. This patch provides a “user timeout” support as described in RFC793. The socket option is also needed for the … Read more
What is the difference between “zero-copy networking” and “kernel bypass”? Are they two phrases meaning the same thing, or different? Is kernel bypass a technique used within “zero copy networking” and this is the relationship? TL;DR – They are different concepts, but it is quite likely that zero copy is supported within kernel bypass API/framework. … Read more
The “SO_” prefix is for “socket option”, so yes, these are per-socket settings for the per-socket buffers. There are usually system-wide defaults and maximum values. SO_RCVBUF is simpler to understand: it is the size of the buffer the kernel allocates to hold the data arriving into the given socket during the time between it arrives … Read more
HTTP is an application protocol. It basically means that HTTP itself can’t be used to transport information to/from a remote end point. Instead it relies on an underlying protocol which in HTTP’s case is TCP. You can read more about OSI layers if you are interested. Sockets on the other hand are an API that … Read more
The problem with sleeping a constant amount of 1 second after each transfer is that you will have choppy network performance. Let BandwidthMaxThreshold be the desired bandwidth threshold. Let TransferRate be the current transfer rate of the connection. Then… If you detect your TransferRate > BandwidthMaxThreshold then you do a SleepTime = 1 + SleepTime … Read more
Use the other encode method in URLEncoder: URLEncoder.encode(String, String) The first parameter is the text to encode; the second is the name of the character encoding to use (e.g., UTF-8). For example: System.out.println( URLEncoder.encode( “urlParameterString”, java.nio.charset.StandardCharsets.UTF_8.toString() ) );