June 2004
Intermediate to advanced
840 pages
39h 47m
English
Content preview from The Internet and Its Protocols
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364 Chapter 7 Transport Over IP
IP Header
UDP
Header
RTP Header Payload Data
......
iw,~ -,q ;i,~ -,~ p,-- --~ v
20 bytes 8 bytes 12 bytes
40 bytes of overhead
Figure
7.39 RTP over UDP and IP imposes at least a 40-byte overhead in IPv4
But the worst case is far worse. The IP header might have a few extra bytes
for IP options, and the RTP header might include one or more CSRCs. Then
security might be adding to the header size, and the IP addresses might use
IPv6. Further, there may be considerable overhead from the lower-layer network
protocols such as ATM or Ethernet--in fact, the overhead
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