all of a sudden only UDP checksum errors on tunnel packets

[magerorg]

All of a sudden I do get only UDP checksum errors on my tunnel that did work fine for some time. A tcpdump on the tunnel interface looks like this:

Code Select Expand

tcpdump: listening on he-ipv6, link-type RAW (Raw IP), snapshot length 262144 bytes
20:42:58.198739 IP6 (flowlabel 0xd55fa, hlim 64, next-header TCP (6) payload length: 40) tunnel783682-pt.tunnel.tserv6.fra1.ipv6.he.net.58198 > fra07s64-in-x200a.1e100.net.https: Flags [S], cksum 0xef0c (incorrect -> 0xa65a), seq 4134613256, win 65320, options [mss 1420,sackOK,TS val 1442402625 ecr 0,nop,wscale 7], length 0
20:43:11.797944 IP6 (flowlabel 0x05cb6, hlim 64, next-header UDP (17) payload length: 48) tunnel783682-pt.tunnel.tserv6.fra1.ipv6.he.net.41641 > derp18d.tailscale.com.3478: [bad udp cksum 0x5fa2 -> 0x495a!] UDP, length 40
20:43:11.797981 IP6 (flowlabel 0x3760e, hlim 64, next-header UDP (17) payload length: 48) tunnel783682-pt.tunnel.tserv6.fra1.ipv6.he.net.41641 > derp8g.tailscale.com.3478: [bad udp cksum 0x515d -> 0xb6d7!] UDP, length 40
20:43:25.033529 IP6 (flowlabel 0xe1e69, hlim 64, next-header TCP (6) payload length: 40) tunnel783682-pt.tunnel.tserv6.fra1.ipv6.he.net.32866 > fra15s17-in-x0a.1e100.net.https: Flags [S], cksum 0xef19 (incorrect -> 0xfc5b), seq 3240943780, win 65320, options [mss 1420,sackOK,TS val 2096282838 ecr 0,nop,wscale 7], length 0

Anyone having a clue what might be going wrong?

[magerorg]

Ok, must have been a problem at my provider, problem fixed.