Do you observe fragmentation? If so, where does it occur? Explain your observation.
What will be an ideal response?
No. TCP exchange its MSS in connection setup phase so that fragmentation in IP layer can be avoided. Frame 1 and Frame 4 are the connection setup packets and it shows the proper MSS exchanged
.```
(74 bytes on wire, 74 bytes captured)
Arrival Time: Aug 23, 2003 03:21:29.155284000
Time delta from previous packet: 0.000000000 seconds
Time relative to first packet: 0.000000000 seconds
Frame Number: 1
Packet Length: 74 bytes
Capture Length: 74 bytes
Ethernet II, Src: 00:50:bf:90:7d:33, Dst: 00:50:bf:90:67:74
Destination: 00:50:bf:90:67:74 (10.0.1.33)
Source: 00:50:bf:90:7d:33 (10.0.1.11)
Type: IP (0x0800)
Internet Protocol, Src Addr: 10.0.1.11 (10.0.1.11), Dst Addr: 10.0.2.22 (10.0.2.22)
Version: 4
Header length: 20 bytes
Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
0000 00.. = Differentiated Services Codepoint: Default (0x00)
.... ..0. = ECN-Capable Transport (ECT): 0
.... ...0 = ECN-CE: 0
Total Length: 60
Identification: 0xa084 (41092)
Flags: 0x04
.1.. = Don't fragment: Set
..0. = More fragments: Not set
Fragment offset: 0
Time to live: 64
Protocol: TCP (0x06)
Header checksum: 0x8317 (correct)
Source: 10.0.1.11 (10.0.1.11)
Destination: 10.0.2.22 (10.0.2.22)
Transmission Control Protocol, Src Port: 3098 (3098), Dst Port: 4444 (4444), Seq:
1331640308, Ack: 0, Len: 0
Source port: 3098 (3098)
Destination port: 4444 (4444)
Sequence number: 1331640308
Header length: 40 bytes
Flags: 0x0002 (SYN)
0... .... = Congestion Window Reduced (CWR): Not set
.0.. .... = ECN-Echo: Not set
..0. .... = Urgent: Not set
...0 .... = Acknowledgment: Not set
.... 0... = Push: Not set
.... .0.. = Reset: Not set
.... ..1. = Syn: Set
.... ...0 = Fin: Not set
Window size: 5840
Checksum: 0xddca (correct)
Options: (20 bytes)
Maximum segment size: 1460 bytes
SACK permitted
Time stamp: tsval 1218416, tsecr 0
NOP Window scale: 0 (multiply by 1)
```
Frame 4
```
(74 bytes on wire, 74 bytes captured)
Arrival Time: Aug 23, 2003 03:21:29.156626000
Time delta from previous packet: 0.001342000 seconds
Time relative to first packet: 0.001342000 seconds
Frame Number: 4
Packet Length: 74 bytes
Capture Length: 74 bytes
Ethernet II, Src: 00:50:bf:90:67:74, Dst: 00:50:bf:90:7d:33
Destination: 00:50:bf:90:7d:33 (10.0.1.11)
Source: 00:50:bf:90:67:74 (10.0.1.33)
Type: IP (0x0800)
Internet Protocol, Src Addr: 10.0.2.22 (10.0.2.22), Dst Addr: 10.0.1.11 (10.0.1.11)
Version: 4
Header length: 20 bytes
Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
0000 00.. = Differentiated Services Codepoint: Default (0x00)
.... ..0. = ECN-Capable Transport (ECT): 0
.... ...0 = ECN-CE: 0
Total Length: 60
Identification: 0x0000 (0)
Flags: 0x04
.1.. = Don't fragment: Set
..0. = More fragments: Not set
Fragment offset: 0
Time to live: 63
Protocol: TCP (0x06)
Header checksum: 0x249c (correct)
Source: 10.0.2.22 (10.0.2.22)
Destination: 10.0.1.11 (10.0.1.11)
Transmission Control Protocol, Src Port: 4444 (4444), Dst Port: 3098 (3098), Seq:
1303493241, Ack: 1331640309, Len: 0
Source port: 4444 (4444)
Destination port: 3098 (3098)
Sequence number: 1303493241
Acknowledgement number: 1331640309
Header length: 40 bytes
Flags: 0x0012 (SYN, ACK)
0... .... = Congestion Window Reduced (CWR): Not set
.0.. .... = ECN-Echo: Not set
..0. .... = Urgent: Not set
...1 .... = Acknowledgment: Set
.... 0... = Push: Not set
.... .0.. = Reset: Not set
.... ..1. = Syn: Set
.... ...0 = Fin: Not set
Window size: 1792
Checksum: 0x528c (correct)
Options: (20 bytes)
Maximum segment size: 460 bytes
SACK permitted Time stamp: tsval 1218216, tsecr 1218416
NOP Window scale: 0 (multiply by 1)
```
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