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.
