一个简单的问题，通常在INTERNET上，UDP的丢包率大概是多少？？？

COOKER 2003-06-20 10:37:03

假设包的大小在1K之内.

1秒钟发3-5个包的话。

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Fly1980 2003-07-30

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Oghma 2003-07-30

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udp在localhost上传输也会有丢包，这是因为缓存空间问题引起，你发的越快，丢包越多,虽然你可以用setsockopt设置一个很大的缓存区，但是不能保证操作系统将实际分配那么多内存，如果只是每秒向本机发3个1k的包，一般而言应该没有丢包。在Internet上由于没有可靠性控制，还与网络状况有关,因此，没有办法给出具体概率.

bossd 2003-07-29

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执行 netstat -s 就可以

twinkle007 2003-07-29

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我有测试,根据网络环境不同,概率也不同,
同一网络也会不一样的.差别比较大
顺便说一下,我自己的程序测试的.

cypher111 2003-07-26

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请教：怎么用SNMP协议查啊？

jigsawpuzzle 2003-07-22

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SNMP协议查一下就知道了，如下：
IP Statistics

Packets Received = 19681
Received Header Errors = 0
Received Address Errors = 0
Datagrams Forwarded = 0
Unknown Protocols Received = 0
Received Packets Discarded = 0
Received Packets Delivered = 19681
Output Requests = 19400
Routing Discards = 0
Discarded Output Packets = 0
Output Packet No Route = 0
Reassembly Required = 0
Reassembly Successful = 0
Reassembly Failures = 0
Datagrams Successfully Fragmented = 0
Datagrams Failing Fragmentation = 0
Fragments Created = 0

ICMP Statistics

Received Sent
Messages 1 2
Errors 0 0
Destination Unreachable 0 1
Time Exceeded 0 0
Parameter Problems 0 0
Source Quenches 0 0
Redirects 0 0
Echos 1 0
Echo Replies 0 1
Timestamps 0 0
Timestamp Replies 0 0
Address Masks 0 0
Address Mask Replies 0 0

TCP Statistics

Active Opens = 990
Passive Opens = 2
Failed Connection Attempts = 2
Reset Connections = 870
Current Connections = 0
Segments Received = 12815
Segments Sent = 12474
Segments Retransmitted = 3

UDP Statistics

Datagrams Received = 6796
No Ports = 69
Receive Errors = 0
Datagrams Sent = 6921