Addresses & Boundary

Destination Address

The destination address is another checked fixed-header field.

highlighted = computed this step

The destination is another wide address

The destination address field is also 128 bits wide.

destination bits=128\text{destination bits}=128
Destination addressThe source and destination addresses are decoded from the fixed header.Destination address320 bits / 40 bytes0x600123450004114020010db800000000000000000000000120010db8000000000000000000000002byte 0byte 1byte 2byte 301100000000000010010001101000101byte 4byte 5byte 6byte 700000000000001000001000101000000byte 8byte 9byte 10byte 1100100000000000010000110110111000byte 12byte 13byte 14byte 1500000000000000000000000000000000byte 16byte 17byte 18byte 1900000000000000000000000000000000byte 20byte 21byte 22byte 2300000000000000000000000000000001byte 24byte 25byte 26byte 2700100000000000010000110110111000byte 28byte 29byte 30byte 3100000000000000000000000000000000byte 32byte 33byte 34byte 3500000000000000000000000000000000byte 36byte 37byte 38byte 3900000000000000000000000000000010version6traffic-class0flow-label0x12345payload-length4next-header17->UDPhop-limit64source2001:db8::1(cont.)(cont.)(cont.)destination2001:db8::2(cont.)(cont.)(cont.)

Destination is pinned as exact bits

The displayed destination comes from exact integer 0x20010db8000000000000000000000002.

dst=0x20010db8000000000000000000000002\text{dst}=0x20010db8000000000000000000000002
Destination addressThe source and destination addresses are decoded from the fixed header.Destination address320 bits / 40 bytes0x600123450004114020010db800000000000000000000000120010db8000000000000000000000002byte 0byte 1byte 2byte 301100000000000010010001101000101byte 4byte 5byte 6byte 700000000000001000001000101000000byte 8byte 9byte 10byte 1100100000000000010000110110111000byte 12byte 13byte 14byte 1500000000000000000000000000000000byte 16byte 17byte 18byte 1900000000000000000000000000000000byte 20byte 21byte 22byte 2300000000000000000000000000000001byte 24byte 25byte 26byte 2700100000000000010000110110111000byte 28byte 29byte 30byte 3100000000000000000000000000000000byte 32byte 33byte 34byte 3500000000000000000000000000000000byte 36byte 37byte 38byte 3900000000000000000000000000000010version6traffic-class0flow-label0x12345payload-length4next-header17->UDPhop-limit64source2001:db8::1(cont.)(cont.)(cont.)destination2001:db8::2(cont.)(cont.)(cont.)

The pair stays in the header

Source and destination are both part of the fixed header, not the payload marker.

128+128128+128
Destination addressThe source and destination addresses are decoded from the fixed header.Destination address320 bits / 40 bytes0x600123450004114020010db800000000000000000000000120010db8000000000000000000000002byte 0byte 1byte 2byte 301100000000000010010001101000101byte 4byte 5byte 6byte 700000000000001000001000101000000byte 8byte 9byte 10byte 1100100000000000010000110110111000byte 12byte 13byte 14byte 1500000000000000000000000000000000byte 16byte 17byte 18byte 1900000000000000000000000000000000byte 20byte 21byte 22byte 2300000000000000000000000000000001byte 24byte 25byte 26byte 2700100000000000010000110110111000byte 28byte 29byte 30byte 3100000000000000000000000000000000byte 32byte 33byte 34byte 3500000000000000000000000000000000byte 36byte 37byte 38byte 3900000000000000000000000000000010version6traffic-class0flow-label0x12345payload-length4next-header17->UDPhop-limit64source2001:db8::1(cont.)(cont.)(cont.)destination2001:db8::2(cont.)(cont.)(cont.)

Summary

Both addresses are checked as exact field values from the pinned header bytes.

dst=0x20010db8000000000000000000000002\text{dst}=0x20010db8000000000000000000000002
Destination addressThe source and destination addresses are decoded from the fixed header.Destination address320 bits / 40 bytes0x600123450004114020010db800000000000000000000000120010db8000000000000000000000002byte 0byte 1byte 2byte 301100000000000010010001101000101byte 4byte 5byte 6byte 700000000000001000001000101000000byte 8byte 9byte 10byte 1100100000000000010000110110111000byte 12byte 13byte 14byte 1500000000000000000000000000000000byte 16byte 17byte 18byte 1900000000000000000000000000000000byte 20byte 21byte 22byte 2300000000000000000000000000000001byte 24byte 25byte 26byte 2700100000000000010000110110111000byte 28byte 29byte 30byte 3100000000000000000000000000000000byte 32byte 33byte 34byte 3500000000000000000000000000000000byte 36byte 37byte 38byte 3900000000000000000000000000000010version6traffic-class0flow-label0x12345payload-length4next-header17->UDPhop-limit64source2001:db8::1(cont.)(cont.)(cont.)destination2001:db8::2(cont.)(cont.)(cont.)