Hi @trendy!
Please find the following output:
Client:
root@OpenWrt:~# tcpdump -i eth1 -evn udp port 51515
tcpdump: listening on eth1, link-type EN10MB (Ethernet), capture size 262144 bytes
^C
0 packets captured
22 packets received by filter
0 packets dropped by kernel
Server:
sudo tcpdump -i ens4 -env udp port 51515
sudo: unable to resolve host pihole: Name or service not known
tcpdump: listening on ens4, link-type EN10MB (Ethernet), capture size 262144 bytes
12:23:11.549058 42:01:0a:8a:00:01 > 42:01:0a:8a:00:0c, ethertype IPv4 (0x0800), length 190: (tos 0x0, ttl 48, id 2062, offset 0, flags [none], proto UDP (17), length 176)
103.216.145.93.16813 > 10.138.0.12.51515: UDP, length 148
12:23:16.836671 42:01:0a:8a:00:01 > 42:01:0a:8a:00:0c, ethertype IPv4 (0x0800), length 74: (tos 0x0, ttl 47, id 63404, offset 0, flags [DF], proto UDP (17), length 60)
103.216.145.93.16703 > 10.138.0.12.51515: UDP, length 32
12:23:17.249502 42:01:0a:8a:00:01 > 42:01:0a:8a:00:0c, ethertype IPv4 (0x0800), length 190: (tos 0x0, ttl 48, id 2261, offset 0, flags [none], proto UDP (17), length 176)
103.216.145.93.16813 > 10.138.0.12.51515: UDP, length 148
12:23:22.346708 42:01:0a:8a:00:01 > 42:01:0a:8a:00:0c, ethertype IPv4 (0x0800), length 190: (tos 0x0, ttl 48, id 2486, offset 0, flags [none], proto UDP (17), length 176)
103.216.145.93.16813 > 10.138.0.12.51515: UDP, length 148
12:23:28.129462 42:01:0a:8a:00:01 > 42:01:0a:8a:00:0c, ethertype IPv4 (0x0800), length 190: (tos 0x0, ttl 48, id 3049, offset 0, flags [none], proto UDP (17), length 176)
103.216.145.93.16813 > 10.138.0.12.51515: UDP, length 148
12:23:33.895429 42:01:0a:8a:00:01 > 42:01:0a:8a:00:0c, ethertype IPv4 (0x0800), length 190: (tos 0x0, ttl 48, id 3068, offset 0, flags [none], proto UDP (17), length 176)
103.216.145.93.16813 > 10.138.0.12.51515: UDP, length 148
12:23:38.058161 42:01:0a:8a:00:01 > 42:01:0a:8a:00:0c, ethertype IPv4 (0x0800), length 154: (tos 0x0, ttl 47, id 4320, offset 0, flags [none], proto UDP (17), length 140)
103.216.145.93.15954 > 10.138.0.12.51515: UDP, length 112
12:23:38.058633 42:01:0a:8a:00:0c > 42:01:0a:8a:00:01, ethertype IPv4 (0x0800), length 186: (tos 0x0, ttl 64, id 62058, offset 0, flags [none], proto UDP (17), length 172)
10.138.0.12.51515 > 103.216.145.93.15954: UDP, length 144
12:23:38.058777 42:01:0a:8a:00:0c > 42:01:0a:8a:00:01, ethertype IPv4 (0x0800), length 190: (tos 0x88, ttl 64, id 62059, offset 0, flags [none], proto UDP (17), length 176)
10.138.0.12.51515 > 103.216.145.93.15954: UDP, length 148
12:23:38.382430 42:01:0a:8a:00:01 > 42:01:0a:8a:00:0c, ethertype IPv4 (0x0800), length 154: (tos 0x0, ttl 47, id 4360, offset 0, flags [none], proto UDP (17), length 140)
103.216.145.93.15954 > 10.138.0.12.51515: UDP, length 112
12:23:38.382806 42:01:0a:8a:00:0c > 42:01:0a:8a:00:01, ethertype IPv4 (0x0800), length 170: (tos 0x0, ttl 64, id 62092, offset 0, flags [none], proto UDP (17), length 156)
10.138.0.12.51515 > 103.216.145.93.15954: UDP, length 128
12:23:38.383225 42:01:0a:8a:00:01 > 42:01:0a:8a:00:0c, ethertype IPv4 (0x0800), length 134: (tos 0x0, ttl 47, id 4361, offset 0, flags [none], proto UDP (17), length 120)
103.216.145.93.15954 > 10.138.0.12.51515: UDP, length 92
12:23:38.383376 42:01:0a:8a:00:0c > 42:01:0a:8a:00:01, ethertype IPv4 (0x0800), length 74: (tos 0x0, ttl 64, id 62093, offset 0, flags [none], proto UDP (17), length 60)
10.138.0.12.51515 > 103.216.145.93.15954: UDP, length 32
12:23:39.650934 42:01:0a:8a:00:01 > 42:01:0a:8a:00:0c, ethertype IPv4 (0x0800), length 190: (tos 0x0, ttl 48, id 3502, offset 0, flags [none], proto UDP (17), length 176)
103.216.145.93.16813 > 10.138.0.12.51515: UDP, length 148
^C
14 packets captured
14 packets received by filter
0 packets dropped by kernel