[FS#1541] Invalid Kernel logspam : sit: non-ECT from <various IPs, Invalid IPs>

[LEDE Bugs]

The following task has a new comment added:

FS#1541 - Invalid Kernel logspam : sit: non-ECT from 
User who did this - plntyk (plntyk)

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found https://forum.freifunk.net/t/kernel-ip-tunnel-non-ect-from-185-66-194-0-with-tos-0x/6149/5

But there the problem vanished after some random updates
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=1541#comment4708