It is fairly common for implementations to use 576-byte datagrams whenever they can’t verify that the entire path is able to handle larger packets. This rather conservative strategy is used because of the number of implementations with bugs in the code to reassemble fragments. Implementers often try to avoid ever having fragmentation occur. Different implementers take different approaches to deciding when it is safe to use large datagrams. Others will use them for any network on the same campus. 576 bytes is a “safe” size, which every implementation must support.
- It also makes sure that the data arrives, resending datagrams where necessary.
- When TCP/IP is used on top of X.25, the X.25 interface breaks the datagrams up into 128-byte packets.
- The older model of a number of large, self-sufficient computers is beginning to change.
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