Visual TCPIP Trainer
Packet Flow Made Visible
Only for iPhone
$3.99 · Designed for iPhone. Not verified for macOS.
iPhone
See how packets travel. Understand ARP, TTL, and routing through animations. Step execution and 30 challenges make networking click.
Visual TCP/IP Trainer is an educational simulator that lets you see how network communication works. With a simple 4-node topology (PC1 → RT1 → RT2 → PC2) across three segments (172.160.0.0/28, 10.0.0.4/30, 192.168.100.0/28), you can visualize packet flows in real time. Track MAC, IP, TTL, and ICMP at each hop, while the ARP table updates dynamically.
Key Features
Network Topology View: 4 nodes and 3 segments at a glance
Simulation Control: Forward/Reverse, Start/Pause/Reset, Step execution
Detailed View: Frame details (MAC, IP, TTL, ICMP), hop table, real-time ARP table
Challenges (30 total): Beginner/Intermediate/Advanced. Each with Q → Answer → Key point/Field insight. Advanced includes real device command examples
Multilingual: Switch between Japanese and English (challenges included)
What You’ll Learn
TTL behavior: unchanged in L2, decreases only when passing through routers
ARP basics: Who has / is-at, Unknown Unicast handling, effects of Proxy ARP
ICMP and PMTUD: black-hole troubleshooting, MTU-related issues
Why ping fails but TCP works: ICMP control, MTU/PMTUD perspective
Challenge Examples
Same L2, PC-A → PC-B ping: what happens to TTL?
Why does ping fail but TCP works?
What is Proxy ARP? When should it be enabled or disabled?
Longest prefix match in routing (/8, /16, /24 coexistence)
Target Users
Junior engineers / networking beginners
Certification learners (CCNA / CCNP / CCIE)
Trainers or engineers who need demo/teaching tools
Use Cases
Step through from ARP resolution to ICMP reply
Observe MAC/IP/TTL changes via hop table
Reinforce understanding with challenge Q&A and field insights
Privacy
This is a standalone educational app. No personal data is collected.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, MASAHIRO HIRAIWA, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- MASAHIRO HIRAIWA
- Size
- 20.9 MB
- Category
- Utilities
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPod touch
Requires iOS 15.1 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2025 Hiraiwa
