| 10 Feb 2026 |
 kdn | yeah, it's the same for router's IP | 13:46:48 |
 magic_rb | Yeah last time i did it its just trial and error seeing what mtu works or not | 13:47:39 |
| magic_rb | If you know its 1468 then increase your routers uplink mtu to 1532 | 13:47:58 |
| magic_rb | Do you happen to be going over pppoe? That number seems familiar to me (i am going over pppoe) | 13:48:15 |
| magic_rb | Ideally your internal network mtu remains at 1500 | 13:48:31 |
| kdn | no, I'm not going over PPPoE, the connectivity fails over LAN address space too (from Wifi AP to the router over 2 switches) | 13:50:19 |
| kdn | I'm trying to find some MTU settings on AP (EAP773) or zyxel XGS1250-12, but so far no luck | 13:50:42 |
| 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 |
|  dadada (er/ihm) changed their display name from dadada to dadada (er/ihm). | 20:02:31 |
|  @Geezus42:matrix.org removed their profile picture. | 22:22:34 |
| @Geezus42:matrix.org left the room. | 22:23:57 |
| 12 Feb 2026 |
|  antifuchs | 02:26:35 |
| antifuchs left the room. | 02:27:44 |
|  @rungmc:matrix.org removed their display name rungmc. | 05:54:51 |
| @rungmc:matrix.org left the room. | 05:54:59 |
|  @sdvohet:matrix.org changed their display name from Sdvohet to Dsig. | 15:16:21 |
| @sdvohet:matrix.org left the room. | 16:55:00 |
|  GrizzlT joined the room. | 20:35:42 |
|  elisaado [moved to @elisaado:elisaado.com] changed their display name from elisaado to elisaado [moved to @elisaado:elisaado.com]. | 21:04:28 |
| 13 Feb 2026 |
|  Autiboy removed their profile picture. | 00:21:14 |
| Autiboy set a profile picture. | 00:23:05 |
|  dent joined the room. | 05:12:24 |
|  hoplopf joined the room. | 10:19:39 |
|  @ximnoise:infosec.exchange left the room. | 11:42:25 |
