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Packet debugging

Tools for decoding Reticulum on the wire and correlating silent drops.

Wireshark / tshark dissector

Lua plugin: T383838tools/wireshark/rns.lua

Load for one capture:

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tshark -X lua_script:tools/wireshark/rns.lua -r capture.pcap -Y rns -V

Or copy T383838rns.lua into your Wireshark plugins directory.

The dissector registers a UDP heuristic and also binds ports 4242 and 7822 on UDP and TCP. Field names match T383838pkg/packet.DecodeFrame (T383838rns.packet_type, T383838rns.context_name, destination hash, hops).

Capture recipes

Loopback UDP between two local stacks:

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# Linux example. Adjust ports to your interface listen/forward pair.
sudo tcpdump -i lo -w loopback.pcap udp portrange 40000-50000

Public mesh TCP uplink:

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sudo tcpdump -i any -w mesh.pcap host rns.example and tcp port 4242

Before sharing captures, redact or omit payloads that may contain private app_data. Prefer posting rgodump JSONL summaries when possible.

rgodump

Decode hex or pcap UDP payloads to JSON lines:

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make build
./bin/reticulum-go dump -hex <packethex>
./bin/reticulum-go dump -pcap capture.pcap
rgodump -pcap capture.pcap | head

Each line includes a frame object with packettypename, context_name, hashes, and sizes. The same decoder backs handshake vector replay tests under T383838pkg/packet.

Path and link health snapshot

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./bin/reticulum-go snapshot -config ~/.reticulum-go
# or
rgosnap -config ~/.reticulum

JSON includes interface stats, path table rows, active link count, and transport health counters (including announce and path drop reasons). Requires shared-instance RPC like rgostatus.

Drop counters

New health kinds (also under each interface in interface_stats):

┌────────────────────────┬─────────────────────────────────────────────────────┐
│ Name │ Meaning │
├────────────────────────┼─────────────────────────────────────────────────────┤
│ announce_dup │ Duplicate announce ignored within TTL │
│ pathrespsuppressed │ PATH_RESPONSE skipped because next hop is requestor │
│ pathreqdup │ Duplicate path request tag ignored │
│ pathreqno_cache │ Known path but no cached announce to answer with │
│ pathrespqueued_skip │ PATH_RESPONSE already queued for same iface │
│ linkrelayunknown_iface │ Link relay dropped for unknown source iface │
└────────────────────────┴─────────────────────────────────────────────────────┘

Exposed in rgosnap as health and per-interface fields on T383838rgostatus -json.

Handshake reference vectors

T383838pkg/packet/testdata/handshake_vectors.json is regenerated by TestHandshakeVectorPackAndReplay. It stores raw hex plus expected decode trees for announce, PATH_RESPONSE, and LINKREQUEST frames.

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go test ./pkg/packet/ -run TestHandshakeVectorPackAndReplay

Cross-stack timeline

See interop-timeline.md for T383838INTEROP_EVENT names shared with Python and other ports.

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