Re: Does the debian kernel sends the gratuitous arp ?
Hi Groeten, The IP address is already assigned to this interface device eno5np0. Please find my reply mail below. Thanks, Balaji On Mon, 9 Oct 2023 at 20:39, Balaji G wrote: > Hi Geert, > > >>> During `ip link set down dev eno5np0` and `ip link set up dev eno5np0` > > >>>>> are NO IP-addresses involved. > > This interface eno5np0 is configured with the ip addresses(10.45.10.4 ). > > # ifconfig > > eno5np0: flags=4163 mtu 1500 > inet 10.45.10.4 netmask 255.255.255.0 broadcast 10.45.10.255 > ether 88:e9:a4:49:18:48 txqueuelen 1000 (Ethernet) > RX packets 2967346895 bytes 4417546189260 (4.0 TiB) > RX errors 0 dropped 1 overruns 0 frame 0 > TX packets 1634521866 bytes 2220475762246 (2.0 TiB) > TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 > > > > Thanks, > > Balaji > > > > On Sun, 8 Oct 2023 at 20:58, Jeffrey Walton wrote: > >> On Sun, Oct 8, 2023 at 4:58 AM Geert Stappers >> wrote: >> > >> > On Sun, Oct 08, 2023 at 11:21:10AM +0530, Balaji G wrote: >> > > On Sat, 7 Oct 2023 at 02:50, Jeffrey Walton wrote: >> > > > On Fri, Oct 6, 2023 at 2:04 PM 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. >> > > > > >> > > > > # echo 1 > /proc/sys/net/ipv4/conf/eno5np0/arp_notify >> > > > > # ip link set down dev eno5np0 >> > > > > # ip link set up dev eno5np0 >> > > > > >> > > > > Captured all the packets via tcpdump & the tcpdump is not showing >> any >> > > > > Gratuitous ARP packets. >> > > > > >> > > > > But, with the same commands i could see the Gratuitous ARP being >> sent in >> > > > > Red hat.9.0 (Plow). >> > > > > >> > > > > So, please let me know if this is a specific scenario in Debian >> 11 ?? >> > > > >> > > > I think that's now Poettering: >> > > > >> > > > >> https://github.com/systemd/systemd/blob/main/src/libsystemd-network/sd-ipv4acd.c#L302 >> > > > >> > > >> > > Do you mean this is a known issue & will be fixed in the future >> releases ? >> > >> > Here not Jeff. What I do understand from Jeff message is >> > something like: "I can bitch on systemd, so I do" >> > Time will tell how much Jeff contributes in solving >> > the interesting problem of the invisible gratuitous ARP. >> >> Nope, not that. >> >> I learned a long time ago to answer the question that was asked in the >> body of the post. >> >> You're welcome to complain about Systemd all you like. You won't get >> any complaints from me. It's not a discussion I will engage in. >> >> Jeff >> >
Re: Does the debian kernel sends the gratuitous arp ?
Hi Geert, >>> During `ip link set down dev eno5np0` and `ip link set up dev eno5np0` >>>>> are NO IP-addresses involved. This interface eno5np0 is configured with the ip addresses(10.45.10.4 ). # ifconfig eno5np0: flags=4163 mtu 1500 inet 10.45.10.4 netmask 255.255.255.0 broadcast 10.45.10.255 ether 88:e9:a4:49:18:48 txqueuelen 1000 (Ethernet) RX packets 2967346895 bytes 4417546189260 (4.0 TiB) RX errors 0 dropped 1 overruns 0 frame 0 TX packets 1634521866 bytes 2220475762246 (2.0 TiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 Thanks, Balaji On Sun, 8 Oct 2023 at 20:58, Jeffrey Walton wrote: > On Sun, Oct 8, 2023 at 4:58 AM Geert Stappers wrote: > > > > On Sun, Oct 08, 2023 at 11:21:10AM +0530, Balaji G wrote: > > > On Sat, 7 Oct 2023 at 02:50, Jeffrey Walton wrote: > > > > On Fri, Oct 6, 2023 at 2:04 PM 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. > > > > > > > > > > # echo 1 > /proc/sys/net/ipv4/conf/eno5np0/arp_notify > > > > > # ip link set down dev eno5np0 > > > > > # ip link set up dev eno5np0 > > > > > > > > > > Captured all the packets via tcpdump & the tcpdump is not showing > any > > > > > Gratuitous ARP packets. > > > > > > > > > > But, with the same commands i could see the Gratuitous ARP being > sent in > > > > > Red hat.9.0 (Plow). > > > > > > > > > > So, please let me know if this is a specific scenario in Debian 11 > ?? > > > > > > > > I think that's now Poettering: > > > > > > > > > https://github.com/systemd/systemd/blob/main/src/libsystemd-network/sd-ipv4acd.c#L302 > > > > > > > > > > Do you mean this is a known issue & will be fixed in the future > releases ? > > > > Here not Jeff. What I do understand from Jeff message is > > something like: "I can bitch on systemd, so I do" > > Time will tell how much Jeff contributes in solving > > the interesting problem of the invisible gratuitous ARP. > > Nope, not that. > > I learned a long time ago to answer the question that was asked in the > body of the post. > > You're welcome to complain about Systemd all you like. You won't get > any complaints from me. It's not a discussion I will engage in. > > Jeff >
Re: Does the debian kernel sends the gratuitous arp ?
Hi Jeff, Do you mean this is a known issue & will be fixed in the future releases ? Thanks, Balaji On Sat, 7 Oct 2023 at 02:50, Jeffrey Walton wrote: > On Fri, Oct 6, 2023 at 2:04 PM 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. > > > > # echo 1 > /proc/sys/net/ipv4/conf/eno5np0/arp_notify > > # ip link set down dev eno5np0 > > # ip link set up dev eno5np0 > > > > Captured all the packets via tcpdump & the tcpdump is not showing any > Gratuitous ARP packets. > > > > But, with the same commands i could see the Gratuitous ARP being sent in > Red hat.9.0 (Plow). > > So, please let me know if this is a specific scenario in Debian 11 ?? > > I think that's now Poettering: > > https://github.com/systemd/systemd/blob/main/src/libsystemd-network/sd-ipv4acd.c#L302 > > Jeff >
Does the debian kernel sends the gratuitous arp ?
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. # echo 1 > /proc/sys/net/ipv4/conf/eno5np0/arp_notify # ip link set down dev eno5np0 # ip link set up dev eno5np0 Captured all the packets via tcpdump & the tcpdump is not showing any Gratuitous ARP packets. But, with the same commands i could see the Gratuitous ARP being sent in Red hat.9.0 (Plow). So, please let me know if this is a specific scenario in Debian 11 ?? Thanks, Balaji
