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

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