mirror of
https://github.com/qdm12/gluetun.git
synced 2026-05-07 04:20:12 +02:00
Quentin McGaw
be92aa2ac4
- Existing option `WIREGUARD_MTU` , if set, disables PMTUD and is used - New option `PMTUD_ICMP_ADDRESSES=1.1.1.1,8.8.8.8` and `PMTUD_TCP_ADDRESSES=1.1.1.1:443,8.8.8.8:443` - ICMP PMTUD now targets external-by-default IP addresses - New TCP PMTUD (binary search only) as a second MTU confirmation and fallback mechanism. - Force set TCP MSS to MTU - IP header - TCP base header - "magic 20 bytes" 🎆 - Fix #3108
25 lines
853 B
Go
25 lines
853 B
Go
package constants
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const (
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MaxEthernetFrameSize uint32 = 1500
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// MinIPv4MTU is defined according to
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// https://en.wikipedia.org/wiki/Maximum_transmission_unit#MTUs_for_common_media
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MinIPv4MTU uint32 = 68
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MinIPv6MTU uint32 = 1280
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IPv4HeaderLength uint32 = 20
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IPv6HeaderLength uint32 = 40
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UDPHeaderLength uint32 = 8
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// BaseTCPHeaderLength is the TCP header length without options,
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// which is the minimum TCP header length.
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BaseTCPHeaderLength uint32 = 20
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// MaxTCPHeaderLength is the TCP header length with the maximum options length of 40 bytes.
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// Note this is a hard maximum because of the 4-bit data offset field in the TCP header (15x4=60).
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MaxTCPHeaderLength uint32 = 60
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WireguardHeaderLength uint32 = 32
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OpenVPNHeaderMaxLength uint32 = 1 + // opcode
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8 + // session id
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4 + // packet id
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28 // max possible auth tag/iv
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)
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