Thread: Connect to Internet on demand & disconnect automatically, particularly for GPRS?
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mclarson is offline mclarson
2010-02-14 , 01:27
Posts: 17 | Thanked: 14 times | Joined on Jan 2010 @ London, UK
#135
Originally Posted by azstunt View Post
Code:
$ tcpdump -i wlan0
tcpdump: WARNING: can't create rx ring on packet socket 3: 92-Protocol not avalaible
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
tcpdump: listening on wlan0, link-type EN10MB (Ethernet), capture size 96 bytes
15:43:40.320800 ARP, Request who-has 192.168.1.68 (Broadcast) tell 192.168.1.254, length 28
15.43.40.321075 ARP, Reply 192.168.1.68 is-at c0:38:f9:b3:07:02 (oui Unknown), length 28
15:44:00.404540 ARP, Request who-has 192.168.1.68 (Broadcast) tell 192.168.1.254, length 28
15.44.00.404815 ARP, Reply 192.168.1.68 is-at c0:38:f9:b3:07:02 (oui Unknown), length 28
15:44:21.500182 ARP, Request who-has 192.168.1.68 (Broadcast) tell 192.168.1.254, length 28
15.44.21.500457 ARP, Reply 192.168.1.68 is-at c0:38:f9:b3:07:02 (oui Unknown), length 28
15:44:40.444274 ARP, Request who-has 192.168.1.68 (Broadcast) tell 192.168.1.254, length 28
15.44.40.444549 ARP, Reply 192.168.1.68 is-at c0:38:f9:b3:07:02 (oui Unknown), length 28
It's your access point at .254 address checking that you're still there every 20s, like you said before. These will be 28 byte rx and tx packets. A very quiet connection for the sample period.