How recognize these two different packets?
Hi I have some problems with 4 questions:
1) i have to find the source and destination address in the ip and ethernet headers of a packet that go from my machine to the router. 2) Then i have to do the same for the packet that goes from the router to my partner's machine. Then I have to answer the above questions but now for the echo replay. How could i see these address? The result could be found in the output of a tcpdump? [guest@shakti guest]$ sudo tcpdump -en host 128.238.62.101 and 128.238.61.101 tcpdump: listening on eth0 20:27:36.662737 0:4:75:b5:20:bc 0:3:e3:2a:4a:60 ip 42: 128.238.61.101 > 128.238.62.101: icmp: echo request (DF) 20:27:36.664179 0:3:e3:2a:4a:60 0:4:75:b5:20:bc ip 60: 128.238.62.101 > 128.238.61.101: icmp: echo reply 20:27:37.668885 0:4:75:b5:20:bc 0:3:e3:2a:4a:60 ip 42: 128.238.61.101 > 128.238.62.101: icmp: echo request (DF) 20:27:37.669478 0:3:e3:2a:4a:60 0:4:75:b5:20:bc ip 60: 128.238.62.101 > 128.238.61.101: icmp: echo reply 20:27:38.668890 0:4:75:b5:20:bc 0:3:e3:2a:4a:60 ip 42: 128.238.61.101 > and [guest@shakti guest]$ sudo tcpdump -en Password: tcpdump: listening on eth0 20:26:03.530859 0:3:e3:2a:4a:60 0:3:e3:2a:4a:60 loopback 60: 0000 0100 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 20:26:04.450793 0:3:e3:2a:4a:60 1:80:c2:0:0:0 0026 60: 802.1d config 8000.00:03:e3:2a:4a:60.8003 root 8000.00:03:e3:2a:4a:60 pathcost 0 age 0 max 20 hello 2 fdelay 15 20:26:06.450872 0:3:e3:2a:4a:60 1:80:c2:0:0:0 0026 60: 802.1d config 8000.00:03:e3:2a:4a:60.8003 root 8000.00:03:e3:2a:4a:60 pathcost 0 age 0 max 20 hello 2 fdelay 15 20:26:08.450937 0:3:e3:2a:4a:60 1:80:c2:0:0:0 0026 60: 802.1d config 8000.00:03:e3:2a:4a:60.8003 root 8000.00:03:e3:2a:4a:60 pathcost 0 age 0 max 20 hello 2 fdelay 15 20:26:10.451018 0:3:e3:2a:4a:60 1:80:c2:0:0:0 0026 60: 802.1d config 8000.00:03:e3:2a:4a:60.8003 root 8000.00:03:e3:2a:4a:60 pathcost 0 age 0 max 20 hello 2 fdelay 15 20:26:12.451056 0:3:e3:2a:4a:60 1:80:c2:0:0:0 0026 60: 802.1d config 8000.00:03:e3:2a:4a:60.8003 root 8000.00:03:e3:2a:4a:60 pathcost 0 age 0 max 20 hello 2 fdelay 15 20:26:13.531155 0:3:e3:2a:4a:60 0:3:e3:2a:4a:60 loopback 60: |
someone could help me? it is very important! is the question incomplete?
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