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23 lines
887 B
Go
23 lines
887 B
Go
package network
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import "log/slog"
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// DetectMTU returns the optimal MTU for the WireGuard interface based on the machine's egress network.
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// The egress MTU is capped at MaxWireGuardMTU to not overestimate the path MTU between machines which can go over
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// the public internet. If the egress MTU cannot be detected, it falls back to MaxWireGuardMTU.
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func DetectMTU() int {
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egressMTU, err := detectEgressMTU()
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if err != nil {
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slog.Warn("Failed to detect egress network MTU, falling back to the default WireGuard MTU.",
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"mtu", MaxWireGuardMTU, "err", err)
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return MaxWireGuardMTU
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}
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mtu := egressMTU - wireGuardEncapOverhead
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// Clamp the computed MTU to the range [MinWireGuardMTU, MaxWireGuardMTU].
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mtu = min(max(mtu, MinWireGuardMTU), MaxWireGuardMTU)
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slog.Info("Detected optimal WireGuard MTU from the egress network.", "mtu", mtu, "egress_mtu", egressMTU)
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return mtu
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}
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