quartz/content/notes/cosc203-lab20.md

title	aliases	tags
cosc203-lab20		lab cosc203

1. header

   1. 4 fields
      1. source port
      2. dest port
      3. length
      4. checksum
   2. each field is 2 bytes

2. payload is 980 bytes

   1. max is 65536-8 = 65528

3. 17

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

5. source port 61958, ip 10.112.120.171,

6. cosc ip is 10.66.8.42, using port 80

7. syn

   1. seq number: 0

   2. idetified by the syn flag

8. syn ack

   1. seq num: 0

   2. value of ack field: 1

   3. how did cosc get this value? not sure

   4. identified by flag field

9. get

   1. seq num: 1

10. ack segments

    1. rtt average 4ms
    2. numbers
       1. 1
       2. 1
       3. 1
       4. 1
       5. 1461
       6. 2921

11. buffer space: ?

12. ?

13. 0 - maybe i stopped tracing too early?

14. bytes per second

average size of segment is 1514 bytes. there were (155-32 = 123 segments). so 186222 bytes were sent in 0.049 secs = 3800448.98 bytes per second

15. 0.0034 seconds