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Path MTU discovery fixes and improvements (#3109)

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- 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
This commit is contained in:
Quentin McGaw
2026-02-15 01:40:34 +01:00
committed by GitHub
parent 8f1fda7646
commit be92aa2ac4
59 changed files with 2050 additions and 376 deletions
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internal/configuration/settings/settings_test.go
+11 -8
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@@ -29,14 +29,17 @@ func Test_Settings_String(t *testing.T) {
| | └── OpenVPN server selection settings:
| | ├── Protocol: UDP
| | └── Private Internet Access encryption preset: strong
| └── OpenVPN settings:
| ├── OpenVPN version: 2.6
| ├── User: [not set]
| ├── Password: [not set]
| ├── Private Internet Access encryption preset: strong
| ├── Network interface: tun0
| ├── Run OpenVPN as: root
| └── Verbosity level: 1
| ├── OpenVPN settings:
| | ├── OpenVPN version: 2.6
| | ├── User: [not set]
| | ├── Password: [not set]
| | ├── Private Internet Access encryption preset: strong
| | ├── Network interface: tun0
| | ├── Run OpenVPN as: root
| | └── Verbosity level: 1
| └── Path MTU discovery:
| ├── ICMP addresses: 1.1.1.1, 8.8.8.8
| └── TCP addresses: 1.1.1.1:443, 8.8.8.8:443
├── DNS settings:
| ├── Keep existing nameserver(s): no
| ├── DNS server address to use: 127.0.0.1