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wgengine/netstack: make netstack MTU be 1280 also

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Updates #3878

Change-Id: I1850085b32c8a40d85607b4ad433622c97d96a8d
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2022-05-31 15:35:01 -07:00
committed by Brad Fitzpatrick
parent 81487169f0
commit 1336fb740b
3 changed files with 19 additions and 11 deletions
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16
net/tstun/constants.go Normal file
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@@ -0,0 +1,16 @@
// 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

10
net/tstun/tun.go
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@@ -20,15 +20,7 @@ import (
"tailscale.com/types/logger"
)
// tunMTU is the MTU we set on tailscale's TUN interface. 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.
var tunMTU = 1280
var tunMTU = DefaultMTU
func init() {
if mtu, ok := envknob.LookupInt("TS_DEBUG_MTU"); ok {