// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. package tstun // DefaultMTU is the Tailscale default MTU for now. // // wireguard-go defaults to 1420 bytes, which only works if the // "outer" MTU is 1500 bytes. This breaks on DSL connections // (typically 1492 MTU) and on GCE (1460 MTU?!). // // 1280 is the smallest MTU allowed for IPv6, which is a sensible // "probably works everywhere" setting until we develop proper PMTU // discovery. const DefaultMTU = 1280