Elvis Woo

For example: 
[user@linuxos ~]# ping 172.30.30.0 -b
WARNING: pinging broadcast address
PING 172.30.30.0 (172.30.30.0) 56(84) bytes of data.
64 bytes from 172.30.30.123: icmp_seq=1 ttl=255 time=0.805 ms
64 bytes from 172.30.30.2: icmp_seq=1 ttl=255 time=1.30 ms (DUP!)
64 bytes from 172.30.30.15: icmp_seq=1 ttl=64 time=33.0 ms (DUP!)
64 bytes from 172.30.30.11: icmp_seq=1 ttl=64 time=35.0 ms (DUP!)
64 bytes from 172.30.30.14: icmp_seq=1 ttl=64 time=37.2 ms (DUP!)
64 bytes [...]

The R&D LAN of Lenovo Research Institute Shanghai Branch
(Nov. 6, 2005)
Four Catalyst 3550-24:
3550-001(vtp server)
3550-002
3550-003
3550-lab
 
Detail: http://www.elviswoo.com/?page_id=23
 
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switchport mode access
switchport port-security
switchport port-security violation shutdown
switchport port-security mac-address sticky
switchport port-security aging static
switchport port-security mac-address sticky XXXX.XXXX.XXXX
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