请教高手，一种奇怪的ping现象

shumu

myhost:/home/myuser # ping 192.168.1.15
PING 192.168.1.15 (192.168.1.15) 56(84) bytes of data.
From 61.152.xxx.xxx: icmp_seq=1 Time to live exceeded
From 61.152.xxx.xxx icmp_seq=1 Time to live exceeded
From 61.152.xxx.xxx icmp_seq=2 Time to live exceeded
From 61.152.xxx.xxx icmp_seq=3 Time to live exceeded
From 61.152.xxx.xxx icmp_seq=4 Time to live exceeded
From 61.152.xxx.xxx icmp_seq=5 Time to live exceeded
From 61.152.xxx.xxx icmp_seq=6 Time to live exceeded

--- 192.168.1.15 ping statistics ---
6 packets transmitted, 0 received, +7 errors, 100% packet loss, time 5006ms

接着ping该地址
PING 61.152.xxx.xxx (61.152.xxx.xxx) 56(84) bytes of data.
64 bytes from 61.152.xxx.xxx: icmp_seq=1 ttl=248 time=48.2 ms
64 bytes from 61.152.xxx.xxx: icmp_seq=2 ttl=248 time=49.8 ms
64 bytes from 61.152.xxx.xxx: icmp_seq=3 ttl=248 time=49.6 ms


接着扫描该地址Interesting ports on 61.152.xxx.xxx:
Not shown: 1655 closed ports
PORT     STATE    SERVICE
135/tcp  filtered msrpc
139/tcp  filtered netbios-ssn
198/tcp  filtered dls-mon
262/tcp  filtered arcisdms
337/tcp  filtered unknown
445/tcp  filtered microsoft-ds
540/tcp  filtered uucp
593/tcp  filtered http-rpc-epmap
717/tcp  filtered unknown
772/tcp  filtered cycleserv2
1022/tcp filtered unknown
1023/tcp filtered netvenuechat
1025/tcp filtered NFS-or-IIS
1068/tcp filtered instl_bootc
1506/tcp filtered utcd
1532/tcp filtered miroconnect
1761/tcp filtered landesk-rc
4444/tcp filtered krb524
4557/tcp filtered fax
4662/tcp filtered edonkey
5800/tcp filtered vnc-http
5900/tcp filtered vnc
6002/tcp filtered X11:2
6667/tcp filtered irc
6881/tcp filtered bittorent-tracker

Nmap finished: 1 IP address (1 host up) scanned in 20.755 seconds

shumu

本地是adsl,只有一台机子， 不是192.168.1.15，而且登录adsl的web管理界面后，查看记录里面有两个网卡地址是陌生的。很奇怪。。

shumu

原来本机地址是192.168.1.200 ／adsl猫 是192.168.1.1
Ping192.168.1.15 能够ping通,但不知道那是个什么东东，也不知道从哪里来，nmap -O 192.168.1.15识别显示是(realtek semiconductor)这么奇怪的东东到底是什么。
感觉不对劲以后我把地址改为192.168.2.200 ／adsl猫是192.168.2.1
ping 192.168.1.15后就出现了顶楼的效果。