Don't Fragment (DF) bit
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Bit in the IP header that instructs routers not to fragment
a packet. You might set this bit if the destination host cannot reassemble
the packet or if you want to test the path maximum transmission unit
(MTU) for a destination host.
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routing instance
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Collection of routing tables, interfaces, and routing protocol
interfaces. The set of interfaces belongs to the routing tables, and
the routing protocol parameters control the information in the routing
tables.
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loose source routing
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Option in the IP header used to route a packet based on information
supplied by the source. A gateway or host must route the packet using
the routers specified by this information, but the packet can use
other routers along the way.
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strict source routing
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Option in the IP header used to route a packet based on information
supplied by the source. A gateway or host must route the packet exactly
as specified by this information.
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time to live (TTL)
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Value (octet) in the IP header that is (usually) decremented
by 1 for each hop the packet passes through. If the field reaches
zero, the packet is discarded and a corresponding error message is
sent to the source of the packet.
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type of service (TOS)
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Value (octet) in the IP header that defines the service the
source host requests, such as the packet's priority and the preferred
delay, throughput, and reliability.
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