c# raw socket ip header total length -

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i using udp raw sockets.

i wish read first, example, 64 bytes of every packet.

ipaddr = ipaddress.parse( "10.1.2.3" );  sock = new socket(addressfamily.internetwork, sockettype.raw, protocoltype.ip); sock.bind(new ipendpoint(ipaddr, 0)); sock.setsocketoption(socketoptionlevel.ip, socketoptionname.headerincluded, true); sock.iocontrol(iocontrolcode.receiveall, bitconverter.getbytes(rcvall_iplevel), null); sock.receivebuffersize = 32768;  byte[] buffer = new byte[64];   // max ip header, plus tcp/udp ports while (!btheend ) {     int ret = sock.receive(buffer, buffer.length, socketflags.none);     ... }

i receive packets, ip header' "total length" <= 64.

if use bigger buffer ( byte[] buffer = new byte[32768] ), got right "total length" ( value <= 32768 ).

the goal packets, ip header, corret packet length; routine doesn't have cause packet fragmentation tcp/ip stack.

socketflags.peek means data returned left intact subsequent read - that's why same data after reading again. read subsequent packets don't want use peek, perform regular read no special flags.

according documentation:

if datagram receive larger size of buffer parameter, buffer gets filled first part of message, excess data lost , socketexception thrown.

is behavior you're after?


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