quartz/content/notes/cosc203-lab24.md
2022-10-12 11:44:45 +13:00

2.2 KiB

title aliases tags
cosc203-lab24
cosc203
lab
  1. 20 bytes in header - 1480 bytes in payload

  2. The more fragments flag is set. the size of the packet is 1500 bytes. Its the first because the id ends with a zero

  3. The id field indicates that it is the second fragment. There are more because the more fragments flag is set printout

  4. the time to live and the id have changed second fragment first fragment

  5. the pattern is tll = 255, 252, 1, 2, 3, 4, 252. first sends a probe with tll=255 (max) maybe to check if it exists? then 4 probes with increasing tll to trace the route. I dont know about the 252 ones

get - packet 76 res - 78

  1. bc:54:2f:5e:83:d7

  2. (00:00:0c:9f:f0:04) - the router i'm connected to

  3. 0800 - ipv4

  4. the G is the 41st byte. Before this is the TCP information

  5. Source: Cisco_65:34:42 (00:2a:6a:65:34:42). the address of the router

  6. bc:54:2f:5e:83:d7 - yes this is my computer

  7. 10.66.8.42

  8. its different not sure why

  9. Destination: Broadcast (ff:ff:ff:ff:ff:ff) this is the default gateway

  10. Opcode: request (1)

  11. yes - needed so that people can reply without also having to send an ARP

a. Sender MAC address: Cisco_9f:f0:04 (00:00:0c:9f:f0:04) the router i am connected to b. Target MAC address: IntelCor_5e:83:d7 (bc:54:2f:5e:83:d7) my computer

  1. default time is 20mins source