No, message boundaries have nothing to do with destinations or ports. A “message boundary” is the separation between two messages being sent over a protocol. UDP preserves message boundaries. If you send “FOO” and then “BAR” over UDP, the other end will receive two datagrams, one containing “FOO” and the other containing “BAR”. If you … Read more
Message Oriented protocols send data in distinct chunks or groups. The receiver of data can determine where one message ends and another begins. Stream protocols send a continuous flow of data. Here is an example with mobile phones. Text messages would be a message oriented protocol as each text message is distinct from the other … Read more
The UDP checksum is performed over the entire payload, and the other fields in the header, and some fields from the IP header. A pseudo-header is constructed from the IP header in order to perform the calculation (which is done over this pseudo-header, the UDP header and the payload). The reason the pseudo-header is included … Read more
the function int inet_pton(int af, const char *src, void *dst); is declared in header file: #include <arpa/inet.h> if this is Windows (Vista or later) there is Winsock analog to this ANSI version: INT WSAAPI InetPton( _In_ INT Family, _In_ PCTSTR pszAddrString, _Out_ PVOID pAddrBuf ); try #include <Ws2tcpip.h> add Ws2_32.lib
Changed: client.addMembership(‘230.185.192.108’); to client.addMembership(‘230.185.192.108’,HOST); //Local IP Address
Some operating systems (eg. Linux kernel after 2.6.20) support a second protocol for SOCK_DGRAM, called UDP-Lite. If supported by your system, it would be enabled by providing IPPROTO_UDPLITE as the third argument to the socket() call. It is differentiated from normal UDP by allowing checksumming to be applied to only a portion of the datagram. … Read more
No. I have been bitten by this before. You may wonder how it can possibly fail, but you’ll run into issues of buffers of pending packets filling up, and consequently packets will be dropped. How the network subsystem drops packets is implementation-dependent and not specified anywhere.
Try binding to the default address: s.bind((”,12345))
The maximum size of UDP payload that, most of the time, will not cause ip fragmentation is MTU size of the host handling the PDU (most of the case it will be 1500) – size of the IP header (20 bytes) – size of UDP header (8 bytes) 1500 MTU – 20 IP hdr – … Read more
Overview What is causing the inability to send/receive data locally? Mostly buffer space. Imagine sending a constant 10MB/second while only able to consume 5MB/second. The operating system and network stack can’t keep up, so packets are dropped. (This differs from TCP, which provides flow control and re-transmission to handle such a situation.) Even when data … Read more