MTU settings for PPPoE — by moeller0 on OpenWrt Forum

advancedforumLink only (©)

A thread on PPPoE and MTU. The answer: keep the WAN and LAN MTU at 1500 because lowering it only shrinks the PPPoE payload further, and rely on the default MSS clamping on the WAN zone to handle the overhead.

Read the full thread on forum.openwrt.org

Source: MTU settings for PPPoE by moeller0 on OpenWrt Forum. Licence: Link only (©).

Source reviewed: 2026-11-02
Link checked: 2026-11-02
Tested hands-on: Not by Oddbyte.Me

mtupppoemss clampingopenwrt

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