On Fri, Oct 06, 2023 at 05:52:16PM +0530, Balaji G wrote: > Hi, > I am using "Debian GNU/Linux 11 (bullseye)" with kernel version 5.16.12. > When i do a link up/down i don't see any Gratuitous ARP being sent.
ARP > # echo 1 > /proc/sys/net/ipv4/conf/eno5np0/arp_notify Probably transmitted "I tried to enforce ARP notification" > # ip link set down dev eno5np0 > # ip link set up dev eno5np0 link > Captured all the packets via tcpdump & the tcpdump is not showing any > Gratuitous ARP packets. Why should it? (Yes, that is a serious question.) > But, with the same commands i could see the Gratuitous ARP being sent in > Red hat.9.0 (Plow). I think more factors have been change as kernel. > So, please let me know if this is a specific scenario in Debian 11 ?? I state that the OP, Original Poster, is the specific scenario. Yeah, that is a blunt statement. Now hear me out. Gratuitous ARP is "linking" MAC-address and IP-address. During `ip link set down dev eno5np0` and `ip link set up dev eno5np0` are NO IP-addresses involved. So there is no need for ARP. I do hope to see a follow-up message like: Re-did the test with a static IP-address on the interface and indeed see a gratuitous ARP or some thing like To reproduce the missing gratuitous ARP do ... Yeah, that might reveal more information about dev eno5np0. > Thanks, > Balaji Groeten Geert Stappers -- Silence is hard to parse
