port number of HTTP server

Question

I try to access the apache server on another machine (Even at localhost). I used

wireshark to get the port number of the packets which are random port number vs 80. This is correct.

But at the mean time, I tried to print out the port number at in the kernel myself at ip_rcv() which tcph->source and tcph->dest. It turned out that these two port numbers are also random.

Not sure what I am doing wrong, can anybody tell me where I can get the correct port number from kernel?

Answer 1

You can't get the port number from any kernel, to set the port number for a Linux web-server do the following if you have apache:

• If you have Apache , then go to /etc/apache2/ports.conf and change the 80 to a desired number of your choice
• Then restart your server with service apache2 restart
• Then in the web browser of your choice go to http://SERVER-IP:portnumber

NOTE: If you change the port number from 80 you must enter the new port number after the url/IP.