Consider a Ping Request packet arriving on a computer with 2 NICs (multi-homed PC). The packet is received on 1 of the interfaces. Now the computer has to send the Ping Response packet. To fill the source IP and source MAC address the computer does which of the following? - Computer first determines which interface should be used as the egress interface by looking at the Destination IP address. Destination IP address was taken from source IP address field of Ping Request packet. Once it determines egress port, it will enter that interface’s IP and MAC address in the Ping Response packet. - Computer takes the destination IP and MAC address of the Ping Request packet and just flips them over to fill source IP and MAC address in Ping Response packet.

Reposting here since want to know how a Linux computer handles this scenario.

  • Bitrot@lemmy.sdf.orgEnglish
    71·
    2 months ago

    These are standards. If it worked differently it would be using a different networking protocol.

    • driftWood@infosec.pubOP
      2·
      2 months ago

      Standards are set of rules. But still different vendors implement them separately. For e.g. TCP/IP stack implementation is a bit different in Windows and Linux but end user generally never realises this because it’s close enough that things still work. I want to know what is the sequence of events when Linux creates a Response packet for a ping Request it received.