Do incoming LAN UDP packets create an entry containing senders MAC in receivers ARP table in Linux?

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When Linux receives a UDP packet originating from a sender having a LAN source IP, will Linux put the source MAC address of this packet along the source IP address into the ARP cache table?






linux udp arp







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  • Have you tried it?
    – Stephen Kitt
    Sep 25 '17 at 14:58










  • I'm about to try it.
    – thomas
    Sep 25 '17 at 15:00















up vote
0
down vote

favorite












When Linux receives a UDP packet originating from a sender having a LAN source IP, will Linux put the source MAC address of this packet along the source IP address into the ARP cache table?






linux udp arp







share|improve this question





















  • Have you tried it?
    – Stephen Kitt
    Sep 25 '17 at 14:58










  • I'm about to try it.
    – thomas
    Sep 25 '17 at 15:00













up vote
0
down vote

favorite









up vote
0
down vote

favorite











When Linux receives a UDP packet originating from a sender having a LAN source IP, will Linux put the source MAC address of this packet along the source IP address into the ARP cache table?






linux udp arp







share|improve this question













When Linux receives a UDP packet originating from a sender having a LAN source IP, will Linux put the source MAC address of this packet along the source IP address into the ARP cache table?






linux udp arp




linux udp arp






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Sep 25 '17 at 14:56









thomas

26527




26527











  • Have you tried it?
    – Stephen Kitt
    Sep 25 '17 at 14:58










  • I'm about to try it.
    – thomas
    Sep 25 '17 at 15:00

















  • Have you tried it?
    – Stephen Kitt
    Sep 25 '17 at 14:58










  • I'm about to try it.
    – thomas
    Sep 25 '17 at 15:00
















Have you tried it?
– Stephen Kitt
Sep 25 '17 at 14:58




Have you tried it?
– Stephen Kitt
Sep 25 '17 at 14:58












I'm about to try it.
– thomas
Sep 25 '17 at 15:00





I'm about to try it.
– thomas
Sep 25 '17 at 15:00











1 Answer
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I tried Linux 4.9 and the answer in this case is no. I crafted an UDP packet with an artificial IP address and MAC address combo, which was received by the Linux-under-Test and displayed correctly by netcat. No ARP entry was created (also no incomplete one) and Linux did not send any ARP request regarding the artificial IP address.






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    1 Answer
    1






    active

    oldest

    votes








    1 Answer
    1






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes








    up vote
    1
    down vote



    accepted










    I tried Linux 4.9 and the answer in this case is no. I crafted an UDP packet with an artificial IP address and MAC address combo, which was received by the Linux-under-Test and displayed correctly by netcat. No ARP entry was created (also no incomplete one) and Linux did not send any ARP request regarding the artificial IP address.






    share|improve this answer
























      up vote
      1
      down vote



      accepted










      I tried Linux 4.9 and the answer in this case is no. I crafted an UDP packet with an artificial IP address and MAC address combo, which was received by the Linux-under-Test and displayed correctly by netcat. No ARP entry was created (also no incomplete one) and Linux did not send any ARP request regarding the artificial IP address.






      share|improve this answer






















        up vote
        1
        down vote



        accepted







        up vote
        1
        down vote



        accepted






        I tried Linux 4.9 and the answer in this case is no. I crafted an UDP packet with an artificial IP address and MAC address combo, which was received by the Linux-under-Test and displayed correctly by netcat. No ARP entry was created (also no incomplete one) and Linux did not send any ARP request regarding the artificial IP address.






        share|improve this answer












        I tried Linux 4.9 and the answer in this case is no. I crafted an UDP packet with an artificial IP address and MAC address combo, which was received by the Linux-under-Test and displayed correctly by netcat. No ARP entry was created (also no incomplete one) and Linux did not send any ARP request regarding the artificial IP address.







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered Sep 25 '17 at 15:32









        thomas

        26527




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