NetDiag+
Where is the MTU setting on my router?
You measured the value — now it has to go somewhere. Open your router's admin page (the address is usually printed on the sticker on the router) and look for the MTU field. These are the paths on the boxes ISPs hand out most often.
| Router | Admin address and path |
|---|---|
| Huawei (HG / DG) | 192.168.100.1 · Advanced → WAN → MTU |
| ZTE (F-series) | 192.168.1.1 · Internet → WAN → MTU |
| TP-Link | 192.168.0.1 · Advanced → Network → Internet → MTU Size |
| Zyxel (LTE / NR) | 192.168.1.1 · Network Setting → Broadband → MTU |
| Nokia | 192.168.1.254 · Network → WAN → MTU |
Menu names vary by model and firmware version. Most consumer routers only accept values between 1280 and 1500 — 1280 is the minimum MTU required for IPv6.
If the field is greyed out or missing
Many ISP-supplied boxes lock the MTU field. You have three options: set the MTU on the device itself (macOS, Windows and Linux all expose it in network settings), set it in your VPN client instead (WireGuard: MTU, OpenVPN: tun-mtu), or ask your provider to change it — some will do it remotely. The heavy-handed option is bridge mode plus your own router.
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