receive the header before receiving the subsequent part ), this overhead is not large at all. If the length of your UDP data exceeds the upper limit, consider re-designing the packet structure.
The last article is a good one.:
During UDP programming, the most common question is how many bytes are sent at a time?
Of course, there is no unique answer. The answer is different from the requirements of different systems. Here I only analyze the situation of sending chat messages like ICQ, in ot
Use the Oracle analysis function ROW_NUMBER ()
1. row_number () over () sorting function:
(1) row_number () over () group sorting function:
When the row_number () over () function is used, the execution of grouping and sorting in over () is later than that of where group by order.
Partition by is used to group A result set. If it is not specified, it regards the entire result set as a group. What is different from the aggregate function is that it can return multiple records in a group, aggregat
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During UDP programming, the most common question is how many bytes are sent at a time?
Of course, there is no unique answer. The answer to this question varies with the requirements of different systems.For example, if you want to analyze the situation of sending chat messages like ICQ, you may also get some help in other situations:First, we know that TCP/IP is generally considered as a layer-4 protocol system, including the link layer, network layer, transport layer, and application layer.UDP
clause on the basis of the previous syntax to specify the qualification, at which point the syntax is as follows:
Copy Code code as follows:
SELECT [DISTINCT] * | field [Alias] [, Field [alias]]
from table name [alias]
[WHERE condition (S)];
More than one condition can be added after a WHERE clause, the most common condition being the basic relational operations:>, >=,
1. Relational operation
SELECT * from EMP where sal>1500
warmth of a day and the wind of a day of comfort, I wish "Good Morning"!
37. Finally know that there are many things, not to throw away the breakup no longer contact, you can solve. With worries, everything loses.
38. I have 1500 pieces, you also have 1500, I take this 1500 hoard goods, and you take this 15
Recently, I used an online music listening software, which has many good stories for children. However, online music often experiences intermittent disconnection, and the software requires more than 1500 credits to download the entire page. To meet the credit conditions, you need to manually install dozens of recommended applications. Therefore, the attack is decided. If the name of apkis mytest.apk, perform the following steps: Step 1: Obtain the res
Problem description Xiao Ming's company every month to pay Xiao Ming, and Xiao Ming received wages for the payment of personal income tax after the wages. Assuming that his one-month pre-tax salary (after deducting five of the risk of a gold, not withholding tax before the wages) is S-yuan, then he should pay the personal income tax according to the following formula calculation:1) Personal income tax threshold of 3500 yuan, if S not more than 3500, then do not pay taxes, more than 3500 yuan
Computer network summary
1. p110 indicates the MAC frame format in V2 format. The data field (that is, IP packet) length ranges from 46 bytes to 1500 bytes, which is defined for Ethernet, "1500 bytes" is also called the Ethernet MTU (maximum transmission unit, that is, Ethernet limits the maximum length of IP datagram to 1500 bytes ). P185 indicates the IP datag
= 1472 time = 2 ms TTL = 255
......
Ping-F-l 1473 10.1.70.1
Packet needs tobe fragmented but DF set.
Packet needs tobe fragmented but DF set.
......
This indicates that the maximum transmission unit MTU from the client machine to 10.1.70.1 is 1472 + 28 (the length of the packet header encapsulated in the Ethernet) = 1500, and all packets larger than 1500 need to be cut. The default MTU in Ethernet is
About the size of UDP data transmitted over the Internet, Post found on the Forum
Http://bbs.csdn.net/topics/20299532#new_post
Part of the post posted on Delphi monopoly. For details, see
Http://www.delphibbs.com/delphibbs/dispq.asp? Lid = 726166
Wheel learning Note 1: UDP programming in Ethernet
1. During UDP programming, the most common question is how many bytes are sent at a time?Of course, there is no unique answer. The answer to this question varies with the requirements of different syste
Recently in because of learning remoting, purely just to understand, found that remoting is really good things.
We usually have three ways to use remoting, one is
First type: Publishing a public objectExposed objects are created on-premisesSecond type: Remote creation of a public object (SAO)Object creation in the client requestThird type: Remote creation of a private object (CAO)object is created on the host, the client references the object on the server
I do not have a good understanding of
The maximum size of a UDP package can be larger. 1. When programming with UDP, we are most likely to think of the problem of how many bytes are sent at a time? Of course, there is no unique answer. The answer is different from the requirements of different systems. Here I only analyze the situation of sending chat messages like ICQ, in other cases, you may also get some help: First, we know that TCP/IP is generally considered a layer-4 protocol system, including the link layer, network layer, tr
~ 1500 bytes.
· FCS-this field contains a 32-bit Cyclic Redundancy Check (Cyclic Redundancy Check, CRC) value to verify damaged frames.
The initial Ethernet II frame format has some drawbacks. To allow conflict detection, 10 Mbits/s Ethernet requires the minimum group size to 64 bytes. This means that if the frame length does not reach the standard, 0 must be used to fill the short frame. Therefore, the upper-layer protocol must contain a "length" f
analyzing the data, we found that:The data forwarded by the customer on site is far greater than the data during local testing.
Analyze the messages sent by the MonitorServer and the messages received by monitord as follows:
1 // MonitorServer sends Code 2 3 esmonitor_assist_t m_monitord_prms; 4 5... 6 7 tmp = sock. createSock (pConf-> m_monitordServerList [I]. c_str (), ES_MONITOR_PORT, IPPROTO_TCP, CLIENT); 8 9... 10 11 if (sock. sendData (_ int8 *) m_monitord_prms, sizeof (m_monitord_prms)
Record a Multicast DNS (mdns) problem-(ifconfig in linux), mdnsifconfig
Preface:Recently, the problem of mdns query has been fixed. The problem can be summarized into three parts, which are basic issues:
1. Gateway ifconfig query address
2. encoding of multiple programs occupying one port at the same time
3. mdns protocol and source code
Mdns is a protocol used for LAN discovery. For the linux system mounted by the gateway, you must first determine the address used for communication and descri
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