NixOS Networking - Public Room Timeline

	NixOS Networking	900 Members
	on your Router! Declaratively manage your switching, routing, wireless, tunneling and more.	270 Servers

Sender	Message	Time
18 Jan 2026
	magic_rb joined the room.	13:00:53
magic_rb	hi, im here from a different account cause my HS is down	13:01:22
magic_rb	im seeing a very weird issue with wireguard, my network topology is `server -- managed l3 switch -- banana pi r4 -- pppoe -- internet`. for some reason if the `pppoe` link drops then wireguard cant reach my VPS on the internet. The packets from the VPS arrive to my server, but then my server's responses get lost to the void	13:02:57
magic_rb	ive ran `tcpdump` and `nft monitor trace` confirming that my server does send out the packets, yet my banana pi r4 doesn't see them...	13:03:31
magic_rb	on my server i see `12:58:44.828966 00:25:90:85:56:3e > 2e:2c:64:a9:08:37, ethertype IPv4 (0x0800), length 134: (tos 0x88, ttl 64, id 5539, offset 0, flags [none], proto UDP (17), length 120) 192.168.11.21.6666 > 167.235.230.162.6666: [bad udp cksum 0x5ac1 -> 0x97d9!] UDP, length 92` but no such packet can be seen on my banana pi. I do see other packets from the same server, same port, same wireguard, toward different devices (both LAN and WAN), but this specific `192.168.11.21.6666 > 167.235.230.162.6666` packet is lost to the void somewhere between by server and banana pi	13:04:46
magic_rb	i can also ping my VPS no problem, so it seems like the specific UDP state table entry is fucked somehow?	13:06:17