its not possible to use raw sockets on windows.
you need to use a packet library winpcap. its available in python via wrappers like pcapy.

Would this have an impact on other connections on the server? Will other connections have problem closing/resetting because of this?

Is there any other way I can check if the code is working fine?
and also to check if the website is attacked or not?

Thank you.

Hi Ben

Did you find out the reason for this error, I am facing the same error

the error is for sendto(packet,(dest_ip,0))

I am using raw sockets to send HTTP request to a remote server.I am trying to send initial SYN request to set TCP connection(I have built IP and TCP headers ). I get the above error while trying to send out a SYN packet initially.

anyone has been through this issue and has gotten it to work?

https://en.wikipedia.org/wiki/IPv4_header_checksum

becuse the cheak sum is only 16 bits and you need to add the cerry
for exaple 0x12345 so 0x2345 + 0x1 = 0x2346

can you plz explain why the following step is performed it the above code:

s = (s>>16) + (s & 0xffff);

if attackers platform is linux then we can configure kernel to drop all outgoing rst flag packets by following rules :-

iptables –A OUTPUT –p tcp –s 192.168.56.101 –tcp-flags RST RST –j DROP

iptables –A OUTPUT –p tcp –s 192.168.56.103 –tcp-flags RST RST –j DROP

for further reference follow this link:-

http://www.linuxforu.com/2011/10/syn-flooding-using-scapy-and-prevention-using-iptables/

the syn packet is send by the program, but the syn+ack packet is received by the kernel.
now the kernel is unaware of any syn packets send, since it did not send the syn packet. in such a case it finds the syn+ack packet unexpected and so replies with a rst server to tell the remote server that this is not a valid connection and should be closed down.

this is the default behaviour on both windows and linux. and there is no easy way to prevent the kernel from sending the rst packets.

when I use this to connect a socket server in other pc in linux pc， when I send a syn packet then the server send me a syn+ack packet，But, at the same time, linuc pc send the server a rst packet, but this packet is not sent by my program，why？ I change my port， but it nothing