A botnet port scanning my network?

I have a ton of these log entries in my syslog. The interface is a wireguard tunnel to a VPN/cloud provider which provides a public IPv4 via wireguard, that I use to run an experimental email server on my home server. I have never seen it before, what can this be? Port scanning? I tested setting the firewall rule to drop instead of reject, it continues.

I checked the origin on some of those addresses and int seems like coming from Palo Alto networks, Microsoft, Linode, some Indian and Hong Kong ISPs etc. Seems coordinated and targeted.

I suspect since I have reverse DNS entries/PTR set to this IP and other email server protection mechanisms it may be other mail servers spam checking my server?

Is it a misconfiguration of my firewall? Botnet port scanning? They are probing a lot of different ports.

Sun Oct 27 08:09:48 2024 kern.warn kernel: [6348136.035480] drop wg2 in: IN=wg2 OUT= MAC= SRC=139.144.239.72 DST=<tunnel's-public-IP> LEN=44 TOS=0x00 PREC=0x00 TTL=239 ID=54321 PROTO=TCP SPT=38943 DPT=2222 WINDOW=65535 RES=0x00 SYN URGP=0
Sun Oct 27 08:09:54 2024 kern.warn kernel: [6348142.573277] drop wg2 in: IN=wg2 OUT= MAC= SRC=45.148.10.230 DST=<tunnel's-public-IP> LEN=40 TOS=0x00 PREC=0x00 TTL=247 ID=54321 PROTO=TCP SPT=37282 DPT=56575 WINDOW=65535 RES=0x00 SYN URGP=0
Sun Oct 27 08:10:08 2024 kern.warn kernel: [6348156.722507] drop wg2 in: IN=wg2 OUT= MAC= SRC=205.185.124.254 DST=<tunnel's-public-IP> LEN=44 TOS=0x00 PREC=0x00 TTL=239 ID=54321 PROTO=TCP SPT=36893 DPT=8080 WINDOW=65535 RES=0x00 SYN URGP=0
Sun Oct 27 08:10:15 2024 kern.warn kernel: [6348163.630032] drop wg2 in: IN=wg2 OUT= MAC= SRC=199.195.252.239 DST=<tunnel's-public-IP> LEN=44 TOS=0x00 PREC=0x00 TTL=244 ID=54321 PROTO=TCP SPT=54292 DPT=8080 WINDOW=65535 RES=0x00 SYN URGP=0
Sun Oct 27 08:10:29 2024 kern.warn kernel: [6348177.451661] drop wg2 in: IN=wg2 OUT= MAC= SRC=87.121.86.115 DST=<tunnel's-public-IP> LEN=40 TOS=0x00 PREC=0x20 TTL=244 ID=34096 PROTO=TCP SPT=60000 DPT=7031 WINDOW=1024 RES=0x00 SYN URGP=0
Sun Oct 27 08:10:42 2024 kern.warn kernel: [6348190.401152] drop wg2 in: IN=wg2 OUT= MAC= SRC=194.127.179.3 DST=<tunnel's-public-IP> LEN=40 TOS=0x00 PREC=0x00 TTL=247 ID=54321 PROTO=TCP SPT=56792 DPT=123 WINDOW=65535 RES=0x00 SYN URGP=0
Sun Oct 27 08:10:51 2024 kern.warn kernel: [6348199.619444] drop wg2 in: IN=wg2 OUT= MAC= SRC=154.213.184.18 DST=<tunnel's-public-IP> LEN=40 TOS=0x00 PREC=0x00 TTL=246 ID=54321 PROTO=TCP SPT=49217 DPT=1085 WINDOW=65535 RES=0x00 SYN URGP=0
Sun Oct 27 08:10:51 2024 kern.warn kernel: [6348199.655352] drop wg2 in: IN=wg2 OUT= MAC= SRC=95.214.27.40 DST=<tunnel's-public-IP> LEN=62 TOS=0x00 PREC=0x00 TTL=247 ID=54321 PROTO=UDP SPT=25481 DPT=161 LEN=42
Sun Oct 27 08:11:08 2024 kern.warn kernel: [6348216.807155] drop wg2 in: IN=wg2 OUT= MAC= SRC=162.62.58.193 DST=<tunnel's-public-IP> LEN=48 TOS=0x00 PREC=0x00 TTL=240 ID=54321 PROTO=ICMP TYPE=8 CODE=0 ID=29767 SEQ=50194
Sun Oct 27 08:11:13 2024 kern.warn kernel: [6348221.478291] drop wg2 in: IN=wg2 OUT= MAC= SRC=80.75.212.9 DST=<tunnel's-public-IP> LEN=40 TOS=0x00 PREC=0x00 TTL=247 ID=54321 PROTO=TCP SPT=40213 DPT=40046 WINDOW=65535 RES=0x00 SYN URGP=0
Sun Oct 27 08:11:48 2024 kern.warn kernel: [6348256.585577] drop wg2 in: IN=wg2 OUT= MAC= SRC=95.214.27.170 DST=<tunnel's-public-IP> LEN=40 TOS=0x00 PREC=0x00 TTL=247 ID=54321 PROTO=TCP SPT=56626 DPT=3128 WINDOW=65535 RES=0x00 SYN URGP=0
Sun Oct 27 08:11:52 2024 kern.warn kernel: [6348260.810732] drop wg2 in: IN=wg2 OUT= MAC= SRC=104.209.35.59 DST=<tunnel's-public-IP> LEN=40 TOS=0x00 PREC=0x00 TTL=230 ID=54321 PROTO=TCP SPT=46517 DPT=3306 WINDOW=65535 RES=0x00 SYN URGP=0
Sun Oct 27 08:11:54 2024 kern.warn kernel: [6348262.285611] drop wg2 in: IN=wg2 OUT= MAC= SRC=95.214.55.43 DST=<tunnel's-public-IP> LEN=40 TOS=0x08 PREC=0x20 TTL=243 ID=54321 PROTO=TCP SPT=50647 DPT=85 WINDOW=65535 RES=0x00 SYN URGP=0
Sun Oct 27 08:12:04 2024 kern.warn kernel: [6348272.607818] drop wg2 in: IN=wg2 OUT= MAC= SRC=88.80.20.86 DST=<tunnel's-public-IP> LEN=40 TOS=0x00 PREC=0x00 TTL=246 ID=52875 PROTO=TCP SPT=53695 DPT=5440 WINDOW=1024 RES=0x00 SYN URGP=0
Sun Oct 27 08:12:10 2024 kern.warn kernel: [6348278.646104] drop wg2 in: IN=wg2 OUT= MAC= SRC=78.29.29.126 DST=<tunnel's-public-IP> LEN=60 TOS=0x00 PREC=0x00 TTL=55 ID=15634 DF PROTO=TCP SPT=43538 DPT=23 WINDOW=5840 RES=0x00 SYN URGP=0
Sun Oct 27 08:12:18 2024 kern.warn kernel: [6348286.096778] drop wg2 in: IN=wg2 OUT= MAC= SRC=185.200.116.82 DST=<tunnel's-public-IP> LEN=40 TOS=0x00 PREC=0x00 TTL=232 ID=54321 PROTO=TCP SPT=51840 DPT=1080 WINDOW=65535 RES=0x00 SYN URGP=0
Sun Oct 27 08:12:21 2024 kern.warn kernel: [6348288.932767] drop wg2 in: IN=wg2 OUT= MAC= SRC=103.102.230.3 DST=<tunnel's-public-IP> LEN=40 TOS=0x08 PREC=0x20 TTL=241 ID=54321 PROTO=TCP SPT=55916 DPT=8728 WINDOW=65535 RES=0x00 SYN URGP=0
Sun Oct 27 08:12:31 2024 kern.warn kernel: [6348299.220691] drop wg2 in: IN=wg2 OUT= MAC= SRC=162.216.149.247 DST=<tunnel's-public-IP> LEN=44 TOS=0x00 PREC=0x60 TTL=249 ID=54321 PROTO=TCP SPT=53700 DPT=9992 WINDOW=65535 RES=0x00 SYN URGP=0
Sun Oct 27 08:12:40 2024 kern.warn kernel: [6348308.062431] drop wg2 in: IN=wg2 OUT= MAC= SRC=211.38.185.112 DST=<tunnel's-public-IP> LEN=40 TOS=0x00 PREC=0x00 TTL=50 ID=22288 PROTO=TCP SPT=37196 DPT=34567 WINDOW=28504 RES=0x00 SYN URGP=0
Sun Oct 27 08:12:51 2024 kern.warn kernel: [6348318.927115] drop wg2 in: IN=wg2 OUT= MAC= SRC=179.43.149.122 DST=<tunnel's-public-IP> LEN=52 TOS=0x00 PREC=0x00 TTL=54 ID=14535 PROTO=TCP SPT=32816 DPT=1510 WINDOW=65535 RES=0x00 SYN URGP=0
Sun Oct 27 08:12:53 2024 kern.warn kernel: [6348321.786885] drop wg2 in: IN=wg2 OUT= MAC= SRC=45.33.112.95 DST=<tunnel's-public-IP> LEN=40 TOS=0x00 PREC=0x00 TTL=236 ID=14619 PROTO=TCP SPT=60000 DPT=22055 WINDOW=1024 RES=0x00 SYN URGP=0
Sun Oct 27 08:12:56 2024 kern.warn kernel: [6348324.714496] drop wg2 in: IN=wg2 OUT= MAC= SRC=205.210.31.217 DST=<tunnel's-public-IP> LEN=44 TOS=0x00 PREC=0x60 TTL=249 ID=54321 PROTO=TCP SPT=54459 DPT=2443 WINDOW=65535 RES=0x00 SYN URGP=0
Sun Oct 27 08:12:58 2024 kern.warn kernel: [6348326.588617] drop wg2 in: IN=wg2 OUT= MAC= SRC=185.234.216.91 DST=<tunnel's-public-IP> LEN=40 TOS=0x00 PREC=0x00 TTL=242 ID=36960 PROTO=TCP SPT=49936 DPT=3047 WINDOW=1024 RES=0x00 SYN URGP=0
Sun Oct 27 08:13:00 2024 kern.warn kernel: [6348328.419419] drop wg2 in: IN=wg2 OUT= MAC= SRC=117.200.205.175 DST=<tunnel's-public-IP> LEN=40 TOS=0x00 PREC=0x00 TTL=51 ID=9823 PROTO=TCP SPT=40993 DPT=9000 WINDOW=65433 RES=0x00 SYN URGP=0
Sun Oct 27 08:13:03 2024 kern.warn kernel: [6348331.281992] drop wg2 in: IN=wg2 OUT= MAC= SRC=147.185.133.173 DST=<tunnel's-public-IP> LEN=44 TOS=0x00 PREC=0x60 TTL=249 ID=54321 PROTO=TCP SPT=51126 DPT=47170 WINDOW=65535 RES=0x00 SYN URGP=0
Sun Oct 27 08:13:14 2024 kern.warn kernel: [6348342.145334] drop wg2 in: IN=wg2 OUT= MAC= SRC=205.185.124.254 DST=<tunnel's-public-IP> LEN=44 TOS=0x00 PREC=0x00 TTL=239 ID=54321 PROTO=TCP SPT=41278 DPT=8080 WINDOW=65535 RES=0x00 SYN URGP=0
Sun Oct 27 08:13:17 2024 kern.warn kernel: [6348345.474924] drop wg2 in: IN=wg2 OUT= MAC= SRC=92.63.197.210 DST=<tunnel's-public-IP> LEN=40 TOS=0x00 PREC=0x00 TTL=247 ID=34952 PROTO=TCP SPT=40612 DPT=7793 WINDOW=1024 RES=0x00 SYN URGP=0
Sun Oct 27 08:13:25 2024 kern.warn kernel: [6348353.358882] drop wg2 in: IN=wg2 OUT= MAC= SRC=146.88.241.38 DST=<tunnel's-public-IP> LEN=74 TOS=0x00 PREC=0x00 TTL=234 ID=54321 PROTO=UDP SPT=33397 DPT=5353 LEN=54
Sun Oct 27 08:13:30 2024 kern.warn kernel: [6348357.947598] drop wg2 in: IN=wg2 OUT= MAC= SRC=83.222.190.122 DST=<tunnel's-public-IP> LEN=40 TOS=0x00 PREC=0x00 TTL=245 ID=20355 PROTO=TCP SPT=61000 DPT=7402 WINDOW=1024 RES=0x00 SYN URGP=0
Sun Oct 27 08:13:51 2024 kern.warn kernel: [6348379.224508] drop wg2 in: IN=wg2 OUT= MAC= SRC=79.124.58.222 DST=<tunnel's-public-IP> LEN=40 TOS=0x00 PREC=0x00 TTL=246 ID=59717 PROTO=TCP SPT=43158 DPT=33817 WINDOW=1024 RES=0x00 SYN URGP=0
Sun Oct 27 08:14:23 2024 kern.warn kernel: [6348411.764952] drop wg2 in: IN=wg2 OUT= MAC= SRC=45.156.130.38 DST=<tunnel's-public-IP> LEN=40 TOS=0x00 PREC=0x00 TTL=235 ID=64136 PROTO=TCP SPT=17849 DPT=2018 WINDOW=1024 RES=0x00 SYN URGP=0
Sun Oct 27 08:14:29 2024 kern.warn kernel: [6348417.279173] drop wg2 in: IN=wg2 OUT= MAC= SRC=143.42.173.101 DST=<tunnel's-public-IP> LEN=44 TOS=0x00 PREC=0x00 TTL=237 ID=54321 PROTO=TCP SPT=37177 DPT=8081 WINDOW=65535 RES=0x00 SYN URGP=0
Sun Oct 27 08:14:36 2024 kern.warn kernel: [6348423.998478] drop wg2 in: IN=wg2 OUT= MAC= SRC=195.246.120.122 DST=<tunnel's-public-IP> LEN=28 TOS=0x00 PREC=0x00 TTL=246 ID=61797 PROTO=UDP SPT=61000 DPT=33281 LEN=8
Sun Oct 27 08:14:44 2024 kern.warn kernel: [6348432.593437] drop wg2 in: IN=wg2 OUT= MAC= SRC=193.41.206.142 DST=<tunnel's-public-IP> LEN=40 TOS=0x00 PREC=0x00 TTL=244 ID=54321 PROTO=TCP SPT=43854 DPT=8728 WINDOW=65535 RES=0x00 SYN URGP=0
Sun Oct 27 08:14:50 2024 kern.warn kernel: [6348438.649190] drop wg2 in: IN=wg2 OUT= MAC= SRC=74.91.127.86 DST=<tunnel's-public-IP> LEN=40 TOS=0x00 PREC=0x00 TTL=234 ID=42284 PROTO=TCP SPT=18968 DPT=27021 WINDOW=53270 RES=0x00 SYN URGP=0
Sun Oct 27 08:14:51 2024 kern.warn kernel: [6348439.672508] drop wg2 in: IN=wg2 OUT= MAC= SRC=64.62.156.112 DST=<tunnel's-public-IP> LEN=40 TOS=0x00 PREC=0x00 TTL=241 ID=54321 PROTO=TCP SPT=35483 DPT=9990 WINDOW=65535 RES=0x00 SYN URGP=0
Sun Oct 27 08:14:52 2024 kern.warn kernel: [6348439.929177] drop wg2 in: IN=wg2 OUT= MAC= SRC=74.91.127.86 DST=<tunnel's-public-IP> LEN=40 TOS=0x00 PREC=0x00 TTL=234 ID=47814 PROTO=TCP SPT=41558 DPT=27021 WINDOW=53270 RES=0x00 SYN URGP=0
Sun Oct 27 08:14:52 2024 kern.warn kernel: [6348440.141660] drop wg2 in: IN=wg2 OUT= MAC= SRC=13.59.91.49 DST=<tunnel's-public-IP> LEN=52 TOS=0x08 PREC=0x20 TTL=43 ID=28904 PROTO=TCP SPT=58441 DPT=8092 WINDOW=65535 RES=0x00 SYN URGP=0
Sun Oct 27 08:14:53 2024 kern.warn kernel: [6348441.148175] drop wg2 in: IN=wg2 OUT= MAC= SRC=74.91.127.86 DST=<tunnel's-public-IP> LEN=40 TOS=0x00 PREC=0x00 TTL=234 ID=47814 PROTO=TCP SPT=41558 DPT=27021 WINDOW=53270 RES=0x00 SYN URGP=0
Sun Oct 27 08:14:58 2024 kern.warn kernel: [6348445.915719] drop wg2 in: IN=wg2 OUT= MAC= SRC=74.91.127.86 DST=<tunnel's-public-IP> LEN=40 TOS=0x00 PREC=0x00 TTL=234 ID=32208 PROTO=TCP SPT=19127 DPT=27021 WINDOW=53270 RES=0x00 SYN URGP=0
Sun Oct 27 08:15:19 2024 kern.warn kernel: [6348467.762672] drop wg2 in: IN=wg2 OUT= MAC= SRC=154.213.185.224 DST=<tunnel's-public-IP> LEN=40 TOS=0x00 PREC=0x00 TTL=246 ID=3575 PROTO=TCP SPT=40581 DPT=5006 WINDOW=1024 RES=0x00 SYN URGP=0
Sun Oct 27 08:15:37 2024 kern.warn kernel: [6348485.665451] drop wg2 in: IN=wg2 OUT= MAC= SRC=205.210.31.55 DST=<tunnel's-public-IP> LEN=44 TOS=0x00 PREC=0x60 TTL=249 ID=54321 PROTO=TCP SPT=57265 DPT=11553 WINDOW=65535 RES=0x00 SYN URGP=0
Sun Oct 27 08:15:38 2024 kern.warn kernel: [6348486.311061] drop wg2 in: IN=wg2 OUT= MAC= SRC=178.211.139.105 DST=<tunnel's-public-IP> LEN=40 TOS=0x08 PREC=0x20 TTL=243 ID=54321 PROTO=TCP SPT=57180 DPT=8088 WINDOW=65535 RES=0x00 SYN URGP=0
Sun Oct 27 08:15:40 2024 kern.warn kernel: [6348488.663699] drop wg2 in: IN=wg2 OUT= MAC= SRC=85.209.11.79 DST=<tunnel's-public-IP> LEN=40 TOS=0x00 PREC=0x00 TTL=244 ID=46415 PROTO=TCP SPT=51286 DPT=3166 WINDOW=1024 RES=0x00 SYN URGP=0
Sun Oct 27 08:15:46 2024 kern.warn kernel: [6348494.671241] drop wg2 in: IN=wg2 OUT= MAC= SRC=162.216.150.222 DST=<tunnel's-public-IP> LEN=44 TOS=0x00 PREC=0x00 TTL=58 ID=54321 PROTO=TCP SPT=56882 DPT=463 WINDOW=65535 RES=0x00 SYN URGP=0
Sun Oct 27 08:16:10 2024 kern.warn kernel: [6348518.659873] drop wg2 in: IN=wg2 OUT= MAC= SRC=64.62.156.23 DST=<tunnel's-public-IP> LEN=74 TOS=0x00 PREC=0x00 TTL=50 ID=44498 DF PROTO=UDP SPT=16083 DPT=34980 LEN=54
Sun Oct 27 08:16:11 2024 kern.warn kernel: [6348519.772997] drop wg2 in: IN=wg2 OUT= MAC= SRC=52.226.0.37 DST=<tunnel's-public-IP> LEN=40 TOS=0x00 PREC=0x00 TTL=235 ID=54321 PROTO=TCP SPT=43294 DPT=2304 WINDOW=65535 RES=0x00 SYN URGP=0
Sun Oct 27 08:16:15 2024 kern.warn kernel: [6348523.233665] drop wg2 in: IN=wg2 OUT= MAC= SRC=162.142.125.88 DST=<tunnel's-public-IP> LEN=60 TOS=0x00 PREC=0x00 TTL=53 ID=20808 PROTO=TCP SPT=52301 DPT=2087 WINDOW=42340 RES=0x00 SYN URGP=0
Sun Oct 27 08:16:15 2024 kern.warn kernel: [6348523.710178] drop wg2 in: IN=wg2 OUT= MAC= SRC=74.91.127.86 DST=<tunnel's-public-IP> LEN=40 TOS=0x00 PREC=0x00 TTL=234 ID=43747 PROTO=TCP SPT=34709 DPT=27021 WINDOW=53270 RES=0x00 SYN URGP=0
Sun Oct 27 08:16:18 2024 kern.warn kernel: [6348526.182845] drop wg2 in: IN=wg2 OUT= MAC= SRC=74.91.127.86 DST=<tunnel's-public-IP> LEN=40 TOS=0x00 PREC=0x00 TTL=234 ID=3842 PROTO=TCP SPT=19880 DPT=27021 WINDOW=53270 RES=0x00 SYN URGP=0
Sun Oct 27 08:16:28 2024 kern.warn kernel: [6348536.764328] drop wg2 in: IN=wg2 OUT= MAC= SRC=74.91.127.86 DST=<tunnel's-public-IP> LEN=40 TOS=0x00 PREC=0x00 TTL=234 ID=43747 PROTO=TCP SPT=34709 DPT=27021 WINDOW=53270 RES=0x00 SYN URGP=0
Sun Oct 27 08:16:28 2024 kern.warn kernel: [6348536.834649] drop wg2 in: IN=wg2 OUT= MAC= SRC=217.64.141.68 DST=<tunnel's-public-IP> LEN=40 TOS=0x00 PREC=0x00 TTL=246 ID=31041 DF PROTO=TCP SPT=26800 DPT=8291 WINDOW=14600 RES=0x00 SYN URGP=0
Sun Oct 27 08:16:38 2024 kern.warn kernel: [6348546.442397] drop wg2 in: IN=wg2 OUT= MAC= SRC=83.222.190.122 DST=<tunnel's-public-IP> LEN=40 TOS=0x00 PREC=0x00 TTL=245 ID=7719 PROTO=TCP SPT=61000 DPT=49155 WINDOW=1024 RES=0x00 SYN URGP=0
Sun Oct 27 08:16:41 2024 kern.warn kernel: [6348549.033579] drop wg2 in: IN=wg2 OUT= MAC= SRC=52.81.208.164 DST=<tunnel's-public-IP> LEN=40 TOS=0x00 PREC=0x00 TTL=233 ID=54321 PROTO=ICMP TYPE=8 CODE=0 ID=64554 SEQ=0
Sun Oct 27 08:17:17 2024 kern.warn kernel: [6348585.013355] drop wg2 in: IN=wg2 OUT= MAC= SRC=167.94.145.92 DST=<tunnel's-public-IP> LEN=60 TOS=0x00 PREC=0x00 TTL=51 ID=14012 PROTO=TCP SPT=58861 DPT=3584 WINDOW=42340 RES=0x00 SYN URGP=0
Sun Oct 27 08:17:22 2024 kern.warn kernel: [6348590.738208] drop wg2 in: IN=wg2 OUT= MAC= SRC=198.235.24.90 DST=<tunnel's-public-IP> LEN=44 TOS=0x00 PREC=0x60 TTL=249 ID=54321 PROTO=TCP SPT=53425 DPT=56222 WINDOW=65535 RES=0x00 SYN URGP=0
Sun Oct 27 08:17:29 2024 kern.warn kernel: [6348597.508893] drop wg2 in: IN=wg2 OUT= MAC= SRC=195.251.255.69 DST=<tunnel's-public-IP> LEN=32 TOS=0x08 PREC=0x20 TTL=44 ID=41677 DF PROTO=ICMP TYPE=8 CODE=0 ID=30477 SEQ=4794
Sun Oct 27 08:17:54 2024 kern.warn kernel: [6348622.587994] drop wg2 in: IN=wg2 OUT= MAC= SRC=156.234.200.240 DST=<tunnel's-public-IP> LEN=40 TOS=0x00 PREC=0x00 TTL=234 ID=36474 PROTO=TCP SPT=22597 DPT=30445 WINDOW=53270 RES=0x00 SYN URGP=0
Sun Oct 27 08:17:55 2024 kern.warn kernel: [6348623.193256] drop wg2 in: IN=wg2 OUT= MAC= SRC=156.234.200.240 DST=<tunnel's-public-IP> LEN=40 TOS=0x00 PREC=0x00 TTL=234 ID=34051 PROTO=TCP SPT=53247 DPT=30445 WINDOW=53270 RES=0x00 SYN URGP=0
Sun Oct 27 08:18:17 2024 kern.warn kernel: [6348645.443127] drop wg2 in: IN=wg2 OUT= MAC= SRC=218.161.95.98 DST=<tunnel's-public-IP> LEN=40 TOS=0x00 PREC=0x00 TTL=50 ID=28690 PROTO=TCP SPT=48738 DPT=88 WINDOW=56637 RES=0x00 SYN URGP=0
Sun Oct 27 08:18:21 2024 kern.warn kernel: [6348648.885264] drop wg2 in: IN=wg2 OUT= MAC= SRC=198.235.24.88 DST=<tunnel's-public-IP> LEN=44 TOS=0x00 PREC=0x60 TTL=249 ID=57406 PROTO=TCP SPT=54555 DPT=179 WINDOW=1024 RES=0x00 SYN URGP=0
Sun Oct 27 08:18:27 2024 kern.warn kernel: [6348655.418734] drop wg2 in: IN=wg2 OUT= MAC= SRC=108.165.46.206 DST=<tunnel's-public-IP> LEN=444 TOS=0x00 PREC=0x00 TTL=51 ID=15226 DF PROTO=UDP SPT=5213 DPT=5060 LEN=424
Sun Oct 27 08:18:28 2024 kern.warn kernel: [6348656.573406] drop wg2 in: IN=wg2 OUT= MAC= SRC=46.101.145.169 DST=<tunnel's-public-IP> LEN=40 TOS=0x00 PREC=0x00 TTL=239 ID=24299 PROTO=TCP SPT=47917 DPT=58002 WINDOW=1024 RES=0x00 SYN URGP=0
Sun Oct 27 08:18:29 2024 kern.warn kernel: [6348657.830985] drop wg2 in: IN=wg2 OUT= MAC= SRC=199.45.154.190 DST=<tunnel's-public-IP> LEN=60 TOS=0x00 PREC=0x00 TTL=47 ID=60238 PROTO=TCP SPT=42272 DPT=1883 WINDOW=42340 RES=0x00 SYN URGP=0
Sun Oct 27 08:18:34 2024 kern.warn kernel: [6348662.207928] drop wg2 in: IN=wg2 OUT= MAC= SRC=206.168.34.132 DST=<tunnel's-public-IP> LEN=60 TOS=0x00 PREC=0x00 TTL=50 ID=34532 PROTO=TCP SPT=3081 DPT=6499 WINDOW=42340 RES=0x00 SYN URGP=0
Sun Oct 27 08:18:44 2024 kern.warn kernel: [6348672.069801] drop wg2 in: IN=wg2 OUT= MAC= SRC=87.120.116.167 DST=<tunnel's-public-IP> LEN=40 TOS=0x00 PREC=0x20 TTL=244 ID=31574 PROTO=TCP SPT=53833 DPT=1209 WINDOW=1024 RES=0x00 SYN URGP=0
Sun Oct 27 08:19:05 2024 kern.warn kernel: [6348693.115732] drop wg2 in: IN=wg2 OUT= MAC= SRC=167.94.138.134 DST=<tunnel's-public-IP> LEN=46 TOS=0x00 PREC=0x00 TTL=34 ID=38406 PROTO=UDP SPT=61897 DPT=10001 LEN=26
Sun Oct 27 08:19:16 2024 kern.warn kernel: [6348704.426286] drop wg2 in: IN=wg2 OUT= MAC= SRC=162.216.149.153 DST=<tunnel's-public-IP> LEN=44 TOS=0x00 PREC=0x00 TTL=58 ID=54321 PROTO=TCP SPT=54399 DPT=13389 WINDOW=65535 RES=0x00 SYN URGP=0
Sun Oct 27 08:19:20 2024 kern.warn kernel: [6348708.781679] drop wg2 in: IN=wg2 OUT= MAC= SRC=198.235.24.182 DST=<tunnel's-public-IP> LEN=44 TOS=0x00 PREC=0x00 TTL=58 ID=54321 PROTO=TCP SPT=56713 DPT=9080 WINDOW=65535 RES=0x00 SYN URGP=0

Yes, this looks like port scans from bots, they are probing the most common ports.

That is normal everyday internet noise.

Ok, thanks. Can I change the log level to not include these entries in my syslog?

ubus call system board

You have rule called "in" with explicit logging, logging all is not default. Better log what hits end of in/out/forward chains.

?

@GasGas277,

Just to be clear, this email server on your Wireguard connection isn't configured to be an Open SMTP Relay - correct?

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No, it is not configured as an open SMTP relay.

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Please elaborate on system version, and probably config/firewall content. The log is added by you, it is not there by default.

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