Since you are sending a UDP packet the "Client Data" field will contain an IP packet with UDP embedded. An IP header with no options is 20 bytes long, a UDP header is 8 bytes long, data is 5 bytes long. The UDP datagram is going to be 13bytes long, the IP packet will be a minimum of 33 bytes long and the ethernet frame will come out to 59 bytes.
SG :: Advanced Tweaking - SpeedGuide UDP Packet Size UDP over IP has a total header length of 32 bytes (12 bytes for UDP, and 20 bytes for IP). To change the UDP packet size, in the Windows Registry: Analysis of UDP packet loss problem in Linux system For a large number of systems receiving or transmitting UDP packets, you can reduce the probability of packet loss by adjusting the socket buffer size of the system and program. When processing UDP packets, the application should be asynchronous and not have too much processing logic between the two received packets.
net-snmp / RE: Maximum responsePdu packet size
UDP.read() - UDP_TX_PACKET_MAX_SIZE Feb 03, 2015
networking - What is the largest Safe UDP Packet Size on
UDP payload size for DNS messages Aug 28, 2015 Configure the network packet size Server Configuration The maximum network packet size for encrypted connections is 16,383 bytes. Note. If MARS is enabled, the SMUX provider will add a 16-byte header to the packet before TLS encryption, reducing the maximum network packet size to 16368 bytes. Recommendations. UDP message size? - Networking and Multiplayer - GameDev.net Mar 15, 2004 F1® 2020 | UDP Specification