Updated kernel to version 6.9.7+bpo and iproute2 package to version 6.9.0-1~bpo12+1 on both servers, the bug is still reproduced:
user@potok2:~$ sudo tcpdump -e -n -v -xx -i ens5f0 tcpdump: listening on ens5f0, link-type EN10MB (Ethernet), snapshot length 262144 bytes <RSTP packet removed> 18:59:58.207520 b4:96:91:94:3a:74 > b4:96:91:94:36:1c, ethertype IPv4 (0x0800), length 140: (tos 0x0, ttl 64, id 50867, offset 0, flags [DF], proto GRE (47), length 126) 172.16.1.1 > 172.16.1.2: GREv0, Flags [checksum present], sum 0x940b, off 0x0, proto TEB (0x6558), length 106 66:bf:5e:2c:c1:8e > 3e:a5:93:79:26:02, ethertype IPv4 (0x0800), length 98: (tos 0x0, ttl 64, id 53099, offset 0, flags [DF], proto ICMP (1), length 84) 192.168.0.1 > 172.16.4.2: ICMP echo request, id 61963, seq 1, length 64 0x0000: b496 9194 361c b496 9194 3a74 0800 4500 0x0010: 007e c6b3 4000 402f 197a ac10 0101 ac10 0x0020: 0102 8000 6558 940b 0000 3ea5 9379 2602 0x0030: 66bf 5e2c c18e 0800 4500 0054 cf6b 4000 0x0040: 4001 fa81 c0a8 0001 ac10 0402 0800 dcde 0x0050: f20b 0001 7ea6 cc66 0000 0000 1c34 0300 0x0060: 0000 0000 1011 1213 1415 1617 1819 1a1b 0x0070: 1c1d 1e1f 2021 2223 2425 2627 2829 2a2b 0x0080: 2c2d 2e2f 3031 3233 3435 3637 18:59:58.207552 b4:96:91:94:36:1c > b4:96:91:94:3a:74, ethertype IPv4 (0x0800), length 140: (tos 0x0, ttl 64, id 5001, offset 0, flags [DF], proto GRE (47), length 126) 172.16.1.2 > 172.16.1.1: GREv0, Flags [checksum present], sum 0x0, off 0x0, proto TEB (0x6558), length 106 3e:a5:93:79:26:02 > 66:bf:5e:2c:c1:8e, ethertype IPv4 (0x0800), length 98: (tos 0x0, ttl 64, id 24156, offset 0, flags [none], proto ICMP (1), length 84) 172.16.4.2 > 192.168.0.1: ICMP echo reply, id 61963, seq 1, length 64 0x0000: b496 9194 3a74 b496 9194 361c 0800 4500 0x0010: 007e 1389 4000 402f cca4 ac10 0102 ac10 0x0020: 0101 8000 6558 0000 0000 66bf 5e2c c18e 0x0030: 3ea5 9379 2602 0800 4500 0054 5e5c 0000 0x0040: 4001 ab91 ac10 0402 c0a8 0001 0000 e4de 0x0050: f20b 0001 7ea6 cc66 0000 0000 1c34 0300 0x0060: 0000 0000 1011 1213 1415 1617 1819 1a1b 0x0070: 1c1d 1e1f 2021 2223 2425 2627 2829 2a2b 0x0080: 2c2d 2e2f 3031 3233 3435 3637 <RSTP packet removed> ^C 4 packets captured 4 packets received by filter 0 packets dropped by kernel user@potok2:~$ uname -r 6.9.7+bpo-amd64 user@potok2:~$ sudo apt show iproute2 Package: iproute2 Version: 6.9.0-1~bpo12+1 > Both kernel and iproute2, backports is fine too > > On Mon, 19 Aug 2024 at 21:15, Роман Мещеряков > <romanmescherya...@yandex.ru> wrote: > >> Luca, sorry if my question is silly. Do you mean "testing or unstable" >> iproute2 package, Debian kernel or complete fresh Debian installation? >> -- >> Kind regards, Roman Mescheryakov >> >> 19.08.2024, 17:48, "Luca Boccassi" <bl...@debian.org>: >> >> Control: tags -1 moreinfo >> >> On Sun, 18 Aug 2024 21:07:10 +0300 =?utf- >> 8?B?0KDQvtC80LDQvSDQnNC10YnQtdGA0Y/QutC+0LI=?= >> <romanmescherya...@yandex.ru> wrote: >> >> Package: iproute2 >> Version: 6.1.0-3 >> >> Hi, >> >> Can you reproduce the same issue on testing or unstable? >> >> -- >> Kind regards, >> Luca Boccassi