Overview Shaping is a basic and fundamental function in any network. Shaping means control and management of traffic in a network. In IP network, data and information can be sent from one point of network to another points of network using internet framework, which consists of numerous routers, cables, radio resources and many more resources … Continue reading Shaping function in IP network →

Reference http://galsagie.github.io/2015/02/26/dpdk-tips-1/ https://www.ndsl.kaist.edu/~kyoungsoo/papers/TR-symRSS.pdf What is RSS? Receive side scaling (RSS) is a network driver technology that enables the efficient distribution of network receive processing across multiple CPUs in multiprocessor systems. What it does is issue a hash function with a predefined hash key on every packet coming in. The hash function takes the packet IP … Continue reading Receive side scaling (RSS) →

IP packet dump typedef std::basic_string<uint8_t> Packet; void hexdump(const Packet& pkt) { unsigned j=0; for(Packet::const_iterator i=pkt.begin(); i != pkt.end(); ++i) { printf("%02x ", *i); ++j; if(j==8) { printf(" "); } else if(j==16) { j=0; printf("\n"); } } printf("\n"); } ///////////////Alternate///////////////void hexdump(buf, size){ unsigned i; unsigned j=0; for (i=0; i< size; i++) { printf("%02x ", data_pkt[i]); j++; … Continue reading IP Packet dump and related utilities →

Reference https://stackoverflow.com/questions/21411851/how-to-send-data-over-a-raw-ethernet-socket-using-sendto-without-using-sockaddr Example #include <stdlib.h> #include <ctype.h> #include <unistd.h> #include <string.h> #include <sys/socket.h> #include <sys/ioctl.h> #include <linux/if.h> #include <linux/if_packet.h> #include <linux/if_ether.h> #include <stdio.h> #include <arpa/inet.h> int main() { char* ifname = "enp2s0"; unsigned char srcMac[6]; //unsigned char dstMac[6] = {0, 0xDE, 0xAD, 0xBE, 0xEF, 0}; //00:e0:4c:68:3c:3b (enp3s0, 192.168.0.113) unsigned char dstMac[6] = {0, 0xE0, 0x4C, … Continue reading Raw packet program →