On Fri, Oct 06, 2023 at 09:19:32PM +0200, Geert Stappers wrote: > 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
Address Resolution Protocol > > # 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 As in "the link layer" > > Captured all the packets via tcpdump & the tcpdump is not showing any > > Gratuitous ARP packets. > > Why should it? (Yes, that is a serious question.) As opening question for further discussion. Because I like the question Does the Debian kernel sends the gratuitous ARP ? I think the answer is YES and I very curious when gratuitous ARP is ommitted. > > 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. As invitation for telling how the comparsion was done. > > 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 Because in https://lists.debian.org/debian-user/2023/10/msg00212.html I wrote "Lets follow-up https://lists.debian.org/debian-user/2023/10/msg00181.html " Groeten Geert Stappers -- Silence is hard to parse
