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Figure 53. Work with TCP/IP Interfaces Display, Multihoming
Type of Service (TOS)
Type of Service (TOS) is a parameter defined to indicate a quality of the service
desired by an application program. It is specified within a single octet of the IP
datagram header, and it is used to select Internet service. It denotes how the
Internet hosts and routers should make trade-offs between throughput, delay,
reliability, and cost.
TOS is used to identify and select the actual transmission characteristics for a
particular network, the interface, and the route to be used when routing an
Internet datagram. The TOS values are mapped into the actual TOS value of the
particular network a datagram is going through. All of the values are mutually
exclusive.
The TOS values are defined through the Add TCP/IP Interface (ADDTCPIFC) and
Add TCP/IP Route (ADDTCPRTE) commands. The possible selections are as
follows:
*NORMAL
*MINDELAY
*MAXTHRPUT
*MAXRLB
*MINCOST
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OS/400 TCP/IP Configuration and Reference V5R1
Normal service is used for delivery of datagrams.
Minimize delay means that prompt delivery is important for datagrams with
this indication.
Maximize throughput means that high data rate is important for datagrams
with this indication.
Maximize reliability means that a higher level of effort to ensure delivery is
important for datagrams with this indication.
Minimize monetary cost means that lower cost is important for datagrams with
this indication.
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