2023-01-27 21:37:20 +00:00
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// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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2022-05-31 22:35:01 +00:00
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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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