line error:
seudo = new unsigned char(sizeof P_HDR + strlen(dump));

correct:

seudo = new unsigned char[sizeof P_HDR + strlen(dump)]; // type *p = new type[ size ];

seudo = new unsigned char(sizeof P_HDR + strlen(dump));

correct:
seudo = new unsigned char[sizeof P_HDR + strlen(dump)];

thank you!!!

HINSTANCE hDll = LoadLibrary((LPCWSTR)”iphlpapi.dll”);

hDll == NULL and then
GetAdaptersInfo = (pgetadaptersinfo)GetProcAddress(hDll,”GetAdaptersInfo”);

GetAdaptersInfo = NULL too!!!

Suggestions?Thanks

the port 8000 is not open. i check it with open ports 139 and 445. but again don’t receive SYN/ACK. i check wireshark report on both client and server. (also firewall and anti virus is disabled on both.)

the packet is being sent to destination port 8000
check if port 8000 is open on the remote server. this can be done using telnet
telnet server_name 8000

If the remote port is not open, no syn+ack reply would come.

the syn packet is sent and ip and tcp checksums are correct. here is the output and the wireshark report on this packet:

verify the syn packet sent out using wireshark.
ensure that the ip and tcp checksum of the packet is correct as reported by wireshark.

I run it. it send syn flood to my server. But server does not send back any SYN/ACK. Any idea? Please…

unsigned char *seudo;
seudo = new unsigned char(sizeof P_HDR + strlen(dump));
memcpy(seudo, &pseudo_header, sizeof P_HDR);
memcpy(seudo + sizeof P_HDR , data , strlen(dump));

I hope somebody can help me out?

Is there any firewall like zonealarm running ? Firewalls will tend to block such packets.

source code link is now working.