Search Results

I'm sending a SYN packet and now I want to specify the MSS (The maximum segment size option in a TCP packet ) through it.

How can I do that? Also, I'm not getting a SYN-ACK back from the remote...

Yes. I'm using gcc.

Btw, I'm getting a very strange error with sendto. Here's my code. I have compiled it with gcc and I get error :

sendto:invalid argument.

int main(int argc, char *argv[])...

#include <stdio.h>
#include <string.h> // for access
#include <fcntl.h>
#include <dirent.h> // for struct dirent
#include <sys/stat.h> //for struct stat and the functions related to it

int...

Even after that, the problem remains.

Can you tell me what's the problem in this code of mine. I have used your checksum code. I'm not entirely sure, if it's correct or not.

Thanks.

#include<stdlib.h>
#include <stdio.h>
#include...

Andryk, thanks for your reply.

Please post the checksum portion of the pseudo header.

Haha, I'm not trying to implement anything like DoS or Man-in-the-middle, but if happens accidenly, I won't...

Thanks for the reply. Here is the complete code, with all the includes and accessory functions.

This code compiles on Linux machines on which I'm working.

I can't use struct tcphdr and iphdr,...

It's Linux on i686.

Please detail the procedure I have to do.

Thanks.

I was the root on this occasion.

Thanks.

Hi,

I'm trying to use tcpdump for the first time. I installed tcpdump from the rpm. Now when I issue the command tcpdump port 6666, I get an error

tcpdump: no suitable device found

Can you...

Hi,

I'm trying to use tcpdump for the first time. I installed tcpdump from the rpm. Now when I issue the command tcpdump port 6666, I get an error

tcpdump: no suitable device found

Can you...

typedef struct ip_header_t {
unsigned char ihl:4,
version:4;
unsigned char tos;
unsigned short tot_len;
unsigned short id;
unsigned short frag_off;
unsigned char ttl;
unsigned...

>I can't see how this guarantees that your packet is ``well-formed''. Maybe we have differing definitions of ``well-formed'' on this issue, but I mean a packet with valid TCP >content too, not just...

>How do you know this?
I know this, since when I do a revcfrom on the peer, I receive the exact no. of bytes I sent.. If my packet was malformed, I should have got an ICMP error message, which I...

Hi,

I'm trying to create a RAW TCP SYN packet and send it from one Linux machine to another. I know the packet I have created is well formed and is received by the peer.

Now what I want is to...