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