Lab · Mission Tech
Learn by doing.
Every tool Mission Tech has built, grouped by what they teach. Path tools tell a story in order. Lab tools stand alone.
Signal Path I tools
In-order, tell the packet's journey.
Networking · DNS
DNS Resolver
Follow a DNS query: browser to root to TLD to authoritative and back. Watch the recursive resolver walk the full hierarchy step by step. Includes live lookups via Google's public resolver.
Open tool → Path INetworking · IP Routing
Routing Table
Type a destination. Watch your host pick the longest-prefix match and send the packet out the winning interface. Delete the default route. Take an interface down. Watch the packet die.
Open tool → Path INetworking · Layer 2
ARP
Watch your host broadcast "Who has this IP?" to the entire LAN. One device answers with its MAC. See the ARP cache fill. Try an IP nobody owns and watch it fail.
Open tool → Path INetworking · TCP · Visualizer
TCP Handshake
Watch the 3-way handshake form and tear down. Real sequence numbers, every state transition. Chaos mode: drop a SYN, trigger a RST, kill a connection mid-flight.
Open tool → Path INetworking · NAT
NAT Visualizer
Watch your router rewrite packets so many devices share one public IP. See the NAT table fill live. Understand why inbound traffic blocks by default, and how port forwarding punches through. Four scenarios.
Open tool → Path INetworking · OSI Model
Packet Journey
Follow a packet from browser to server and back. Every header added and stripped. NAT rewrites your IP. MAC addresses change at every hop while IP stays constant. 18 steps, all of them real.
Open tool →Layer 2
How Ethernet frames cross a local network.
Signal Path II tools
In-order, tell how trust is proved.
Security · TLS
TLS Handshake
Watch client and server agree on keys. Every flight: ClientHello, ServerHello, certificate, key exchange. Break it with a mismatched cipher.
Open tool → Path IISecurity · Trust
Certificate Trust
Follow a cert chain from leaf to root. See what browsers check before they trust. Flip a byte, expire a cert, watch the chain fail.
Open tool → Path IISecurity · Identity
SSO & OAuth
Sign in with Google. Trace the redirects, the tokens, the trust handoff between identity provider and app.
Open tool → Path IISecurity · State
Session vs. Token
HTTP forgets you. An opaque cookie points at server memory. A signed JWT carries the truth with it. Try both, see the wire traffic, see what each one costs at revocation time.
Open tool →Signal Path III tools
In-order, one server becomes an internet.
Infrastructure · One machine
Servers
What actually is a server. Watch the kernel accept a connection, a worker do the job, and the whole thing fall over when the load climbs. Blocking, prefork, epoll, and four real failure modes.
Open tool → Path IIIInfrastructure · Front door
Load Balancers
One address, a fleet of backends. L4 at packet level, L7 with HTTP awareness, health checks that notice a sick server, and four balancing algorithms side by side with their failure modes.
Open tool → Path IIIInfrastructure · Deny by default
Firewalls
What netfilter actually does to a packet. Stateless rule walks, stateful conntrack, zoned policy with default-deny, and the five quiet failure modes every SRE has hit once.
Open tool → Path IIIInfrastructure · Capstone · Inter-AS
BGP
Twelve real autonomous systems on a canvas. Pick a source and destination, watch the best-path decision tree pick a winner, tune LOCAL_PREF and MED and AS_PATH, then flip Hijack Mode and see the route get stolen.
Open tool →Arcade
Same journey. Chiptune. Canvas and WebAudio, no frameworks.
DNS cluster
How names become addresses.
Networking · DNS · Engine
DNS Visualizer
Step through recursive DNS resolution one state at a time. Cache lookup, root referral, TLD delegation, authoritative answer, CNAME chasing. Watch the resolver's state machine drive the full walk.
Open tool →Networking · DNS
DoH Race
Race DNS-over-HTTPS providers against each other. See which resolver is fastest from your location.
Open tool →TCP cluster
How reliable delivery is negotiated.
Addressing cluster
How addresses are planned.
NAT cluster
What your router hides from the internet.
Measurement
What the browser knows about the network.
Diagnostic
What breaks, and where to look.
Drills
Short challenges. No sandbox. Answer fast.