| 10 Feb 2026 |
 kdn | that seems useful (from Kagi Assistant):
Why 1468 Bytes?
Normal MTU: 1500 bytes
Your effective MTU: 1468 + 28 (ICMP/IP headers) = 1496 bytes
Missing: 4 bytes = exactly the size of a VLAN 802.1Q tag
1
When VLAN tagging is added, frames grow from 1500 to 1504 bytes. If any device in the path doesn't account for this, it causes fragmentation or drops. | 13:51:23 |
| kdn | doh, increasing MTU on the router to 1504 didn't help | 13:53:24 |
| kdn | pinging another device plugged in directly to Mikrotik works fine with whatever MTU, so if I'm correct it must be some issue with the router? | 14:03:58 |
| kdn | yeah, wired 1469 to the router doesn't work either | 14:05:02 |
| kdn | and ipv6 ping stops working at 1449 (20 more bytes), I guess I should move the discussion to #OpenWrt:matrix.org | 14:11:18 |
| kdn | that's curious, I removed some customized configs for devices/links (no idea what I put there, definitely nothing needed), that made me lose internet completely until I rebooted the OpenWRT, now it's functioning correctly all around | 14:40:16 |
| kdn | * that's curious, I removed some customized configs for devices/links (no idea what I put there, definitely nothing needed), that made me lose internet completely until I rebooted the OpenWRT, now it's functioning correctly all around without any custom MTU | 14:40:25 |
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