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送交者: JJZ 于 2008-12-05, 12:21:11:

回答: mac address doesn't propagate through IP network. 由 steven 于 2008-12-05, 12:04:28:

C:\Documents>ping yahoo.com

Pinging yahoo.com [68.180.206.184] with 32 bytes of data:

Reply from 68.180.206.184: bytes=32 time=72ms TTL=53
Reply from 68.180.206.184: bytes=32 time=74ms TTL=53
Reply from 68.180.206.184: bytes=32 time=78ms TTL=53
Reply from 68.180.206.184: bytes=32 time=70ms TTL=53

Ping statistics for 68.180.206.184:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 70ms, Maximum = 78ms, Average = 73ms
C:\Documents>arp -a 68.180.206.184

Interface: 68.121.12.148 --- 0x2b0005
Internet Address Physical Address Type
68.180.206.184 00-19-e4-86-4c-69 dynamic

that mac address will be stripped by the router. (无内容) - steven (0 bytes) 2008-12-05, 12:23:51 (281468)
- you are right, - JJZ (104 bytes) 2008-12-05, 13:10:42 (281505)
  - that functionality provided by the gateway router. - steven (33 bytes) 2008-12-05, 14:11:23 (281541)
    - you are right, L2 Tunneling is part of the TCP/IP family now. (无内容) - steven (0 bytes) 2008-12-05, 16:09:17 (281601)
    - well, L2TP (Layer 2 Tunnel Protocol) supports encrypted tunnels over IP network. - JJZ (38 bytes) 2008-12-05, 15:40:55 (281591)