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54 lines
1.1 KiB
Markdown
54 lines
1.1 KiB
Markdown
---
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title: "cosc203-lab20"
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aliases:
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tags:
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- lab
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- cosc203
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---
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1. header
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1. 4 fields
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1. source port
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2. dest port
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3. length
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4. checksum
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2. each field is 2 bytes
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2. payload is 980 bytes
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1. max is 65536-8 = 65528
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3. 17 
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4. the source port of the first message is the destination port of the second and the destination port of the first is the destination port of the second
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5. source port 61958, ip 10.112.120.171,
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6. cosc ip is 10.66.8.42, using port 80
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7. syn
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1. seq number: 0 
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2. idetified by the syn flag 
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8. syn ack
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1. seq num: 0 
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2. value of ack field: 1 
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3. how did cosc get this value? not sure
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4. identified by flag field 
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9. get [](https://i.imgur.com/LZOuVK9.png)
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1. seq num: 1
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10. ack segments
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1. rtt average 4ms
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2. numbers
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1. |