Sean Fisk
Lab 6 Report
1. 148.61.112.115
2. 0x01 (ICMP)
3. IP Header: 20b
Payload: 36b, I clicked on the layer title line (Internet Control Message Protocol), and looked at
the size in the "status bar".
4. The datagram is not fragmented; the "More fragments" flag is clear (0), meaning that the data
was sent in one packet.
5. ID and TTL
6. All the others stay constant. Protocol, Source, and Destination must stay constant. ID must
change because it is the identifier, it must be unique. TTL must change for the packet to hit and die
at the next router.
7. It goes up by 1-4 for each packet.
8. ID: 0x8622 (34338)
TTL: 255
9. TTL remains the same, but ID changes because it is the unique identifier.
10. Yes, it has been fragmented.
11. Flag "More fragments" is set. Fragment offset is 0, indicating that this is the first fragment.
This IP datagram is 1500 bytes in size.
12. A nonzero Fragment Offset indicates that this is not the first fragment. There are no more
fragments as evidenced by a clear More Fragments flag.
13. Total Length, More Fragments flag, Fragment Offset, and the IP Payload (ICMP vs. just Data)
14. 3 fragments
15. Same as 13: Total Length, More Fragments flag, Fragment Offset, and the IP Payload (ICMP
vs. just Data).
1.
No.
Time
Source
Protocol Info
20 4.233723
148.61.112.115
ICMP
Echo (ping) request
Destination
71.205.181.166
Frame 20 (70 bytes on wire, 70 bytes captured)
Ethernet II, Src: Intel_bc:97:b3 (00:0e:0c:bc:97:b3), Dst:
Cisco_4d:bc:56 (00:1e:be:4d:bc:56)
Internet Protocol, Src: 148.61.112.115 (148.61.112.115), Dst:
71.205.181.166 (71.205.181.166)
Version: 4
Header length: 20 bytes
Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN:
0x00)
Total Length: 56
Identification: 0x575b (22363)
Flags: 0x00
0... = Reserved bit: Not set
.0.. = Don't fragment: Not set
..0. = More fragments: Not set
Fragment offset: 0
Time to live: 1
Protocol: ICMP (0x01)
Header checksum: 0x0000 [incorrect, should be 0x6046]
Source: 148.61.112.115 (148.61.112.115)
Destination: 71.205.181.166 (71.205.181.166)
Internet Control Message Protocol
8.
No.
Time
Source
Destination
Protocol Info
21 4.235492
148.61.112.254
148.61.112.115
ICMP
Time-to-live exceeded (Time to live exceeded in transit)
Frame 21 (70 bytes on wire, 70 bytes captured)
Ethernet II, Src: Cisco_4d:bc:56 (00:1e:be:4d:bc:56), Dst:
Intel_bc:97:b3 (00:0e:0c:bc:97:b3)
Internet Protocol, Src: 148.61.112.254 (148.61.112.254), Dst:
148.61.112.115 (148.61.112.115)
Version: 4
Header length: 20 bytes
Differentiated Services Field: 0xc0 (DSCP 0x30: Class Selector
6; ECN: 0x00)
Total Length: 56
Identification: 0x1cbe (7358)
Flags: 0x00
0... = Reserved bit: Not set
.0.. = Don't fragment: Not set
..0. = More fragments: Not set
Fragment offset: 0
Time to live: 255
Protocol: ICMP (0x01)
Header checksum: 0x945a [correct]
Source: 148.61.112.254 (148.61.112.254)
Destination: 148.61.112.115 (148.61.112.115)
Internet Control Message Protocol
11.
No.
Time
Source
Protocol Info
350 52.419199
148.61.112.115
ICMP
Echo (ping) request
Destination
71.205.181.166
Frame 350 (1514 bytes on wire, 1514 bytes captured)
Ethernet II, Src: Intel_bc:97:b3 (00:0e:0c:bc:97:b3), Dst:
Cisco_4d:bc:56 (00:1e:be:4d:bc:56)
Internet Protocol, Src: 148.61.112.115 (148.61.112.115), Dst:
71.205.181.166 (71.205.181.166)
Version: 4
Header length: 20 bytes
Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN:
0x00)
Total Length: 1500
Identification: 0x57ea (22506)
Flags: 0x02 (More Fragments)
0... = Reserved bit: Not set
.0.. = Don't fragment: Not set
..1. = More fragments: Set
Fragment offset: 0
Time to live: 1
Protocol: ICMP (0x01)
Header checksum: 0x0000 [incorrect, should be 0x3a13]
Source: 148.61.112.115 (148.61.112.115)
Destination: 71.205.181.166 (71.205.181.166)
Internet Control Message Protocol
Type: 8 (Echo (ping) request)
Code: 0 ()
Checksum: 0x67a5
Identifier: 0x0001
Sequence number: 106 (0x006a)
Data (1472 bytes)
12.
No.
Time
Source
Destination
Protocol Info
351 52.419210
148.61.112.115
71.205.181.166
Fragmented IP protocol (proto=ICMP 0x01, off=1480)
IP
Frame 351 (534 bytes on wire, 534 bytes captured)
Ethernet II, Src: Intel_bc:97:b3 (00:0e:0c:bc:97:b3), Dst:
Cisco_4d:bc:56 (00:1e:be:4d:bc:56)
Internet Protocol, Src: 148.61.112.115 (148.61.112.115), Dst:
71.205.181.166 (71.205.181.166)
Version: 4
Header length: 20 bytes
Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN:
0x00)
Total Length: 520
Identification: 0x57ea (22506)
Flags: 0x00
0... = Reserved bit: Not set
.0.. = Don't fragment: Not set
..0. = More fragments: Not set
Fragment offset: 1480
Time to live: 1
Protocol: ICMP (0x01)
Header checksum: 0x0000 [incorrect, should be 0x5d2e]
Source: 148.61.112.115 (148.61.112.115)
Destination: 71.205.181.166 (71.205.181.166)
Data (500 bytes)