Raw socket captures only first 96 bytes of packet

Hi,
I am trying to use raw socket interface to caputre packets on wire.
I am getting only first 96 bytes of packets. Wondering is there any
ioctl or setsocket option to set packet length.

Here is the code snippet ...






int recvSize = 8192;




if ( (sock=socket(PF_INET, SOCK_PACKET,
htons(ETH_P_IP)))<0) {
perror("socket");
exit(1);
}

/* Set the network card in promiscuos mode */
strncpy(ethreq.ifr_name,"eth0",IFNAMSIZ);
if (ioctl(sock,SIOCGIFFLAGS,&ethreq)==-1) {
perror("ioctl");
close(sock);
exit(1);
}
ethreq.ifr_flags|=IFF_PROMISC;
if (ioctl(sock,SIOCSIFFLAGS,&ethreq)==-1) {
perror("ioctl");
close(sock);
exit(1);
}

if(setsockopt(sock, SOL_SOCKET, SO_RCVBUF,
&recvSize, sizeof(recvSize))<0){
perror("setsockopt");
close(sock);
exit(1);
}


while (1) {
printf("----------\n");
n = recvfrom(sock,buffer,2048,0,NULL,NULL);
printf("%d bytes read\n",n);


}

}

Thanks,
Satish

What is the size of buffer in recvfrom call?. Are you trying to capture
any kind of N/W packets or you have server on other side and try to
write?.