Networking Error

Jun 22, 2023

Each layer has its own error detection: the end-to-end principle

# Checksum

• IP prepend a checksum
• IP, UDP, TCP use one’s complement checksum

• Ethernet append a CRC
• Good for detection, catch any 2 bits error, odd number of bit error or any burst $\leq$ c bits long.

• TLS append MAC
• Robust to malicious modifications, but not errors

• Wireless network error handling?

Based on the size of the receiving buffer size.

If one failed, retransmit the entire window.

Retransmit only the packet that is lost.

• Exponential backoff