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最近公司上网不正常，有时打不打网页，过几分钟又正常了。电信来人检查说没问题，但偶尔会丢包，有
时PING DNS（202.96.134.134）的反应时间大于200ms,正常情况是15ms左右,PING内网的每一台电脑都是
1ms左右.设备提供商说是深圳电信质量太差,但在长沙很少出现这样的情况.请大家帮忙看看,谢谢!
网络情况：
接入方式：2条独立的2M ADSL线路（地点:深圳市区）。
接入设备：每条线路都是一个ADSL猫加一个宽带路由器。
电脑数量：30左右，含一台域控制器。
用IP包分析工具查出的本机数据包:
发现每隔一段时间路由器(192.168.123.253)就会发送一个广播,都是10个数据包,且总大小一致,都是从路
由器的1901端口发给239.255.255.250的1900端口,而另一个路由器没这种现象,并且用这个路由器作为网
关,就会出现偶尔的丢包,且用TRACERT跟踪路由全部超时.
SN Type Source IP Port Source Mac Destination IP Port Destionation Mac Data Length
1 UDP 192.168.123.113 138 000D61E868EB 192.168.123.255 138 FFFFFFFFFFFF 266
2 UDP 192.168.123.253 1901 0040A2000648 239.255.255.250 1900 01005E7FFFFA 273
3 UDP 192.168.123.253 1901 0040A2000648 239.255.255.250 1900 01005E7FFFFA 329
4 UDP 192.168.123.253 1901 0040A2000648 239.255.255.250 1900 01005E7FFFFA 257
5 UDP 192.168.123.253 1901 0040A2000648 239.255.255.250 1900 01005E7FFFFA 249
6 UDP 192.168.123.253 1901 0040A2000648 239.255.255.250 1900 01005E7FFFFA 293
7 UDP 192.168.123.253 1901 0040A2000648 239.255.255.250 1900 01005E7FFFFA 269
8 UDP 192.168.123.253 1901 0040A2000648 239.255.255.250 1900 01005E7FFFFA 323
9 UDP 192.168.123.253 1901 0040A2000648 239.255.255.250 1900 01005E7FFFFA 321
10 UDP 192.168.123.253 1901 0040A2000648 239.255.255.250 1900 01005E7FFFFA 325
11 UDP 192.168.123.253 1901 0040A2000648 239.255.255.250 1900 01005E7FFFFA 317
12 UDP 192.168.123.101 137 000D61605D11 192.168.123.255 137 FFFFFFFFFFFF 50
13 UDP 192.168.123.101 137 000D61605D11 192.168.123.255 137 FFFFFFFFFFFF 50
14 UDP 192.168.123.101 137 000D61605D11 192.168.123.255 137 FFFFFFFFFFFF 50
15 UDP 192.168.123.110 138 0020ED2D3F2C 192.168.123.255 138 FFFFFFFFFFFF 201
16 UDP 192.168.123.253 1901 0040A2000648 239.255.255.250 1900 01005E7FFFFA 273
17 UDP 192.168.123.253 1901 0040A2000648 239.255.255.250 1900 01005E7FFFFA 329
18 UDP 192.168.123.253 1901 0040A2000648 239.255.255.250 1900 01005E7FFFFA 257
19 UDP 192.168.123.253 1901 0040A2000648 239.255.255.250 1900 01005E7FFFFA 249
20 UDP 192.168.123.253 1901 0040A2000648 239.255.255.250 1900 01005E7FFFFA 293
21 UDP 192.168.123.253 1901 0040A2000648 239.255.255.250 1900 01005E7FFFFA 269
22 UDP 192.168.123.253 1901 0040A2000648 239.255.255.250 1900 01005E7FFFFA 323
23 UDP 192.168.123.253 1901 0040A2000648 239.255.255.250 1900 01005E7FFFFA 321
24 UDP 192.168.123.253 1901 0040A2000648 239.255.255.250 1900 01005E7FFFFA 325
25 UDP 192.168.123.253 1901 0040A2000648 239.255.255.250 1900 01005E7FFFFA 317
26 UDP 192.168.123.111 137 0020ED2EFBFC 192.168.123.255 137 FFFFFFFFFFFF 50
27 UDP 192.168.123.111 138 0020ED2EFBFC 192.168.123.255 138 FFFFFFFFFFFF 282
28 UDP 192.168.123.111 138 0020ED2EFBFC 192.168.123.255 138 FFFFFFFFFFFF 282
29 UDP 192.168.123.111 138 0020ED2EFBFC 192.168.123.255 138 FFFFFFFFFFFF 282
30 TCP 192.168.123.112 1950 0010DCF44753 207.46.4.64 1863 00304F224DAE 5
31 TCP 207.46.4.64 1863 00304F224DAE 192.168.123.112 1950 0010DCF44753 8
32 TCP 192.168.123.112 1950 0010DCF44753 207.46.4.64 1863 00304F224DAE 0
33 UDP 192.168.123.253 1901 0040A2000648 239.255.255.250 1900 01005E7FFFFA 273
34 UDP 192.168.123.253 1901 0040A2000648 239.255.255.250 1900 01005E7FFFFA 329
35 UDP 192.168.123.253 1901 0040A2000648 239.255.255.250 1900 01005E7FFFFA 257
36 UDP 192.168.123.253 1901 0040A2000648 239.255.255.250 1900 01005E7FFFFA 249
37 UDP 192.168.123.253 1901 0040A2000648 239.255.255.250 1900 01005E7FFFFA 293
38 UDP 192.168.123.253 1901 0040A2000648 239.255.255.250 1900 01005E7FFFFA 269
39 UDP 192.168.123.253 1901 0040A2000648 239.255.255.250 1900 01005E7FFFFA 323
40 UDP 192.168.123.253 1901 0040A2000648 239.255.255.250 1900 01005E7FFFFA 321
41 UDP 192.168.123.253 1901 0040A2000648 239.255.255.250 1900 01005E7FFFFA 325
42 UDP 192.168.123.253 1901 0040A2000648 239.255.255.250 1900 01005E7FFFFA 317
43 UDP 192.168.123.102 137 00E04CC2FAC0 192.168.123.255 137 FFFFFFFFFFFF 50
44 UDP 192.168.123.106 138 000D6171292F 192.168.123.255 138 FFFFFFFFFFFF 201
