b4 Files

[1.26.1] - 2025-12-24

• ADDED: Upload Custom Payloads - upload your own binary payload files instead of capturing from live traffic (avilable in the Settings -> Capture tab).
• ADDED: Use Captured Payloads - new My own Payload file option in Faking settings lets you use previously captured or uploaded payload binaries.
• ADDED: When adding a configuration from Discovery, B4 automatically finds and includes matching geosite categories (e.g., discovering youtube.com will also add the youtube category with related domains from it).
• ADDED: Custom UDP port filtering - configure specific ports per set using the UDP port filter option, and B4 will automatically listen only on those ports.
• ADDED: Live firewall rule updates - changing UDP ports, connection limits, or other core settings in the web UI now takes effect immediately without restarting the service.
• ADDED: Discovery now accepts full URLs. Paste a complete URL like https://youtube.com/watch?v=xyz or https://cdn.example.com/large-file.js instead of just a domain name.
• ADDED: Sequence Overlap Pattern - seqovl. Configure a custom byte pattern in Fragmentation settings that gets mixed into TCP segments to confuse deep packet inspection systems while your real data reaches the server intact. Works with disorder and combo strategies.
• CHANGED: UDP traffic now only listens on port 443 (QUIC) by default instead of all UDP ports, reducing unnecessary packet processing.
• CHANGED: Device names in Connections tab now only appear when Device Filtering is enabled in Settings.
• FIXED: B4 no longer crashes on startup when geodat files (geosite.dat/geoip.dat) were manually deleted.
• FIXED: Re-downloading geodat files now properly reloads all domain and IP targets without requiring a service restart.
• FIXED: IPv6 bypass settings now work correctly - disabling IPv6 in config actually disables IPv6 packet processing.

Full Changelog: https://github.com/DanielLavrushin/b4/compare/v1.26.0...v1.26.1