today i would like to ask about the difference between src. address and dst .address
what is actually the differnce between them . what is the purpose of each one
another question ..
the word out interface mean lingually the place which something go out from it .scientifically the port which internet service go out but her in mikrotike the matter is on the contrary as i understand the out interface= internet input port
see the image above
i would like to know what is exactly difference between out/in interface
Each TCP/IP packet contains a header. That header has several fields in it. One contains the IP address of the device that sent the packet (the source address), and another contains the IP address of the device that the packet is being sent to (the destination address). Once the packets gets to its destination and a reply is sent the content of those fields will be swapped.
The in-interface is the interface through which the packet entered the router. When a local client sends a packet to the Internet the in-interface will be the LAN interface. The out-interface is the interface through which the packet leaves the router. When a local client sends a packet to the Internet the out-interface will be the WAN interface. For the return packet the in-interface will be the WAN interface, and the out-interface will be the LAN interface.
You may want to find some book or online guide to TCP/IP - those questions really are a little to basic for this forum.