The Everything Feed - All Packet Pushers Pods N4N027: Tunneling Quirks & Features
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May 22, 2025 Dive into the quirks of networking tunnels, exploring concepts like maximum transmission units and packet fragmentation. Discover the vital role of ICMP in handling oversized packets and the differences in fragmentation management between IPv4 and IPv6. Learn how UDP and TCP work for real-time communication while uncovering the challenges of implementing new RFCs. The discussion even touches on the influence of firewalls on ICMP messages and emphasizes the importance of community engagement in the networking world.
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Tunnels Increase Packet Size
- Tunnels add headers that increase packet size, potentially exceeding MTU limits.
- This encapsulation overhead must be considered to avoid packet dropping or fragmentation.
IPv6 Drops Fragments No Reassembly
- IPv4 allows IP fragmentation but it is generally discouraged due to performance and security concerns.
- IPv6 removes fragmentation, requiring packets larger than MTU to be dropped instead.
Fragments Pose Security Risks
- Firewalls often block fragments because they hinder security inspection of packet headers.
- Many secure environments discard fragments to prevent evasion of detection.