# 0.2.7
* **Dependency**: Updated netflow_parser from 0.8.0 to 0.9.0
# 0.2.6
* **Feature**: Template caching for NetFlow v9 and IPFIX
- Templates are now built once at startup and cached for reuse across iterations
- Eliminates template regeneration overhead in continuous mode
- Ensures template consistency - same template bytes sent every time
- Validates template_id uniqueness at startup - detects collisions where same template_id is used with different field definitions
- Cached templates are reused instead of regenerated, improving performance and reliability
* **Feature**: Enhanced startup template delivery for better collector reliability
- Templates now sent in first 3 iterations (previously only iteration 1)
- Provides redundancy for unreliable networks or collector startup timing
- After iteration 3, reverts to 30-second refresh interval per RFC recommendations
- Reduces likelihood of data packets arriving before templates
* **Performance**: Maximum parallelization for packet generation
- Restored and enhanced parallel processing using rayon (reverts limitation from v0.2.4)
- Flows are now processed in parallel at multiple levels:
1. Different exporters process completely in parallel (existing behavior)
2. Flows within same exporter now also process in parallel (new optimization)
- Sequence numbers pre-calculated sequentially then packets generated concurrently
- Maintains correct sequence number ordering while maximizing CPU utilization
- Significant performance improvement for configs with multiple flows per exporter
* **Internal**: New template_cache module for centralized template management
* **Internal**: Added PartialEq derives to template field structs for validation
# 0.2.5
* **Fix**: Updated Docker Rust to 1.90 to fix compilation issues.
# 0.2.4
* **Fix**: NetFlow v9 and IPFIX sequence numbers now properly increment across iterations in continuous mode
- Previous behavior reset sequence numbers to 0 on each iteration, causing parsers to detect collisions
- Sequence numbers are now tracked per exporter (source_id for V9, observation_domain_id for IPFIX)
- Each exporter maintains independent sequence counters that increment across iterations
- Prevents "sequence number collision" errors in RFC-compliant parsers
- Single-shot mode (--once) behavior unchanged - still starts from 0 each run
* **Fix**: Removed parallel processing (rayon) for V9/IPFIX flows to maintain proper sequence number ordering
- V5 and V7 flows are processed sequentially for consistency
- Sequential processing ensures correct sequence number tracking
* **Fix**: UDP socket now uses fixed source port 2056 instead of ephemeral ports
- Matches real NetFlow exporter behavior where routers use consistent source ports
- Fixes template collision issues with RFC-compliant collectors (AutoScopedParser, RouterScopedParser)
- RFC 7011 (IPFIX) and RFC 3954 (NetFlow v9) specify scoping by (source_address, observation_domain_id/source_id)
- Previous ephemeral port behavior caused each packet to be treated as a different source
- Port 2056 avoids conflicts with NetFlow collectors typically running on port 2055
* **Dependency**: Updated netflow_parser from 0.7.0 to 0.8.0
* **Documentation**: Added "Sequence Number Tracking" section to README explaining behavior in continuous mode
* **Documentation**: Added "Network Behavior" section to README explaining fixed source port rationale
# 0.2.3
* Bump release for cargo publish and README updates.
# 0.2.2
* **Fix**: Continuous mode with `--output` now appends to a single pcap file instead of creating multiple files
- First iteration creates the pcap file with header
- Subsequent iterations append packets to the same file
- Eliminates the previous behavior of creating `output.pcap`, `output_2.pcap`, `output_3.pcap`, etc.
- Results in one consolidated pcap file for the entire continuous run
* **Fix**: Graceful shutdown handling prevents pcap file corruption when using Ctrl+C
- Added signal handler to intercept Ctrl+C (SIGINT) in continuous mode
- Program now exits cleanly, properly flushing and closing pcap files
- Prevents corrupted pcap files that were unreadable by Wireshark/tcpdump
- Shutdown flag is checked during loop iterations and sleep intervals for responsive exit
# 0.2.1
- Added multi-threading support for parallel packet generation
- New `--threads` CLI option to configure thread pool size (default: 4)
- Flows from configuration files are now generated in parallel using rayon
- Significant performance improvement when processing multiple flows
- Thread pool is configurable from 1 to any desired number of threads
- Added Configuration error variant for thread pool setup errors
# 0.2.0
* **BREAKING**: File output now exports to PCAP format instead of raw binary
- Generated pcap files include proper Ethernet/IP/UDP headers
- Files can be analyzed with Wireshark, tcpdump, and other pcap tools
- Destination IP/port from `--dest` argument is used in pcap headers
* **Safety**: Complete rewrite of all type conversions and arithmetic to use safe operations
- Replaced all `as` casts with `try_from()` with proper error handling
- Replaced all arithmetic (`+`, `-`, `*`, `/`) with checked operations (`checked_add()`, etc.)
- Prevents silent overflow, truncation, and potential panics
- Added comprehensive error messages for invalid packet sizes and overflows
* **Dependencies**: Added `pcap-file` v2.0 for pcap file generation
* **Quality**: Zero clippy warnings, all tests passing
# 0.1.0
* Initial public release
* Support for NetFlow v5, v7, v9, and IPFIX
* YAML configuration support
* Continuous and single-shot modes
* UDP transmission support
* File output (raw binary format)
# 0.0.1
* Initial development release