Question

I can send a UDP packet of 15,750 bytes(15K bytes).When i send a packet beyond this limit from my Android client application i cant receive it at server.I cant receive even 1 byte of data at server that i sent from client.Is this maximum limit?Theoritically UDP packet supports 65,535 bytes.I want to know what is the practical limit? Is this limitation of Android or Mobile or Mobile network carrier?

Answer 1

我知道这个问题是老的,但当你把问题与乌戈普切普切片的交付联系起来时,这个问题就显示出了第一线。如果任何人存在同样的问题,我就认为:

The problem is described here: RFC 1191 - Path MTU Discovery. 65,535 is theoretical size: this is a max value that can be stored in Length field in UDP Header (16 bits). In practice not all network members can handle that big packets.

There is also nice explanation here: Path MTU discovery in practice

One commonly used workaround is to reduce the MTU for all of the outgoing packets. The minimal required MTU for all IPv6 hosts is 1,280, which is fair. Unfortunately for IPv4 the value is 576 bytes. On the other hand RFC4821 suggests that it s "probably safe enough" to assume minimal MTU of 1,024. [...] Forcing a reduced packet size is not an optimal solution though.

There are also more advanced techniques described later in this article.

Answer 2

我猜想你正在使用 Java。 http://docs.oracle.com/javase/6/docs/api/java/net/DatagramSocket.html#getSendBufferSize”rel=“nofollow”http://docs.oracle.com/javase/6/docs/api/java/net/DatagramSocket.html#getSendBufferSize(a)

在我的Oracle Java 6 JVM上,SO_SNUFDB是4097个 by子,但实施时至少处理在Windows上的大型.。我不相信安会的实施。

你们至少知道最少500件事。我忘记了这一提法。

友情链接