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and multiple options can be carried at the same time. The first byte of each option is the Information Code, the last byte is the Data Length of the item, and finally the project content. Code Len value this field is fully compatible with BOOTP, and more options are expanded. DHCP packets can be encoded as 0x53 to set the encapsulation category: item value category.1 DHCP discover2 DHCP offer3 DHCP Request4 DHCPDECLINE5 dhcpack6 dhcpnack7 dhcprelease DHCP has many options. For more information,
characters and binary format attachments. This standard is defined in;RFC 2045,; RFC 2046,; RFC 2047,; RFC 2048, and RFC 2049. By RFCRFC 8222822. It is stipulated that the email standard does not allow the use of characters other than the 7-bit ASCII character set in mail m
HTTP Status Management The original HTTP is designed as a stateless request/response-oriented protocol. It does not have special provisions and is stateful and runs through some logically related request/response exchange sessions. As HTTP protocol is becoming increasingly popular and popular, more and more systems that have never intended to use it have begun to use it for applications, such as transmission methods for e-commerce applications. Therefore, it is necessary to support status manag
A long time ago, I took a rough look at Osip, exosip, ortp and quickly "encapsulate" a Windows-based vc6-based mfc sip Soft Phone (all source code vc6 project files and Lib libraries can be found in this blog shared folder ), due to time constraints, I can only analyze the code of Osip, exosip, and other development libraries in a pure "application" manner. As a matter of interest, I can refer to the working principles of the SIP Phone, but as a reference for commercial product development, it i
Specification"[Iec62455] IEC, IEC 62455, "Internet Protocol (IP) and transport stream (TS) based service access"[Rfc1321] IETF, RFC 1321, "the MD5 message-Digest algorithm", limit l 1992.[Rfc2119] IETF, RFC 2119, "Key Words for use in rfcs To Indicate Requirement Levels", March[Rfc2326] IETF, RFC 2326, "Real Time Streaming Protocol (RTSP)", limit l 1998.[Rfc2616
1 Description 2 Concepts of drilling and traversing... 1 3. Drilling and traversing in P2P... 2 4. Features of protocol traversal using stun series... 2 5 relationship between stun/turn/ice protocols... 3 6 STUN Protocol (RFC 5389) 3 6.1 Why stun protocol is used... 3 6.2 how stun works... 4 7 TURN protocol... 4 7.1 why the TURN protocol is used... 4 7.2 how the TURN protocol works... 5 7.2.1 allocate request... 5 7.2.2 relay port message forwarding..
In the use of the Internet, the most basic protocol stack is the TCP/IP protocol stack. The basic protocols are TCP transmission control protocol and IP Internet protocol. Next, we will introduce the concept and basic structure of the two parties, as well as their functions. TCP: Transmission Control Protocol TCP is a connection-oriented) Reliable, byte stream-based Transport layer (Transport layer) communication protocol, defined by RFC 793 of IETF )
assignment Authority (internet Assigned Numbers Authority, IANA).5. Encapsulation and SeparationEncapsulation: When the application sends data, the data goes from top to bottom through each layer in the protocol hierarchy, each layer adds some header or trailer information to the data, as shown in the data unit passed to the network layer by the transport layer called the TCP Packet segment (TCP segment) or the UDP datagram (UDP Datagram). The data unit that the network layer passes to the link
Kerberos (or Cerberus), a ferocious three-head guardian dog in Greek mythology, Hades. There are some versions of the agreement, and version 1-3 is only available at MIT. Steve Miller and Clifford Neuman, the main designer for Kerberos version 4, released this version at the end of 1980. This version is primarily for project Athena. Version 5, designed by John Kohl and Clifford Neuman, was enacted in 1993 as RFC 1510 (replaced by
Transferred from Wiki Multi-purpose Internet Mail Extension (MIME,Multipurpose Internet Mail Extensions) Is an internet standard that extends the email standard to support mail messages in multiple formats such as non-ASCII characters and binary format attachments. This standard is defined in RFC 2045, RFC 2046, RFC 2047, R
For now, there are 3 main ways that SAP interacts with other systems, namely, the intermediate table, the RfC, and the Web service approach. The 1th intermediate table, that is, the use of intermediate database as an interactive way. The SAP system uses DBCO to establish an association with an intermediary database, using SQL or TSQL to manipulate the database directly. The other system also operates on the intermediate table. The most important adva
be a mid-range router specification. However, because the mid-range router is not specific, you can refer to low-end routers or high-end routers, so no longer separate standards. Iii. Basis of standard setting Router standards are based primarily on RFC documents. Because of the complexity of the routers, the relevant RFC documents are more than hundreds. In addition to a large number of routing protoco
mail server server documentation domain login command Directory (?) [+] SMTP Protocol Analysis1th Chapter.SMTP Overview 1.1. The location of SMTP in mail communication SMTP, the Simple Mail delivery protocol, corresponds to the RFC document RFC821. As with most application layer protocols like HTTP, it works in C/S mode and is used to deliver mail on the Internet. The location of SMTP in the entire e-mail communication is shown in Figure 1. Figure 1
digits in the number of years, that is, "century number"; YY for the latter two digits of the number of years, That is, the number of years in a century. If the value of CC is not given, the touch command parameter in Linux limits the number of years Ccyy to 1969--2068. MM is the number of months, DD for the day will be the number of years Ccyy limited to 1969--2068. MM is the number of months, DD is the n
2051 2072 2084 2101 2112 2131 2133 21382148 2153 2156 2160 2164 2172 2178 2184 2185 2187 2189 2193 2196 2201 2204 2208 2211 2212 2220 2229 2233 2239 2240 2261 2262 2269 2277 2288 2301 2309 2311 2312 2316 2320 2321 2322 2328 2330 2350 2389 2405 2410 2414 2420 2421 2483 2508 2560 2569 2572 2593 26132617 2680 2681 2731 2732 2743 Dynamic Planning: 1013 1022 1025 1027 1074 1076 1093 1094 1100 1107 1108 1136 1149 1183 1196 1200 1206 1227 1234 1245 1249 1250 1276 1303 1346 1353 1366 1368 1387 1424 142
] # ll-rw-r--r--. 1root Root 0 11:11 test1.txt-rw-r--r--. 1 root root 0 may 11:22 Test2.txt-rw-r--r--. 1 root root 0 may 11:22 test.txt[[email protected] test] # touch-t 201605171210.20 test.txt[[email protected] test] # ll-rw-r--r--. 1 Rootroot 0 11:11 test1.txt-rw-r--r--. 1 root root 0 may 11:22 Test2.txt-rw-r--r--. 1 root root 0 may 12:10 test.txt650) this.width=650; "src=" Http://s2.51cto.com/wyfs02/M01/80/3E/wKiom1c8AGyRIBV8AABFOXJqlUM509.png "title=" 111. PNG "style=" float:left; "al
root 0 10-28 14:48 log.log[Email protected] test]# touch-t 201211142234.50 log.log[email protected] test]# LL-rw-r--r--1 root root 0 10-28 14:48 log2012.log-rw-r--r--1 root root 0 10-28 16:01 log2013.log-rw-r--r--1 root root 0 2012-11-14 log.log Description-T time uses the value specified as a new value for the corresponding time stamp of the specified file. The time specified here is a decimal number in the following form:[[Cc]yy] mmddhhmm[. SS]Here, CC is the first two digits of the numb
Log2013.log-rw-r--r--1 root root 0 2012-11-14 log.logDescription-T time uses the value specified as a new value for the corresponding time stamp of the specified file. The time specified here is a decimal number in the following form:[[Cc]yy] mmddhhmm[. SS]Here, CC is the first two digits of the number of years, that is, "century"; yy is the last two digits of the number of years, that is, the number of years in a century. If the value of CC is not given, touch will limit the number of years Cc
compatibility with other UNIX systems.R uses the time record of the reference document, as with the--file effect.D Set the time and date, you can use a variety of different formats.T sets the file's time record in the same format as the date instruction. [[Cc]yy] mmddhhmm[. SS],CC is the first two digits in the number of years, that is, "century number"; YY for the latter two digits of the number of years, That is, the number of years in a century. If the value of CC is not given, the touch com
Describe Create an empty file or update the file timestampCommon Command Parameters-R Sets the date and time of the specified document or directory to the same date and time as the reference document or directory.-T uses the specified date time instead of the current time.Watch out.-T time uses the value specified as a new value for the corresponding time stamp of the specified file. The time specified here is a decimal number in the following form:[[Cc]yy] mmddhhmm[. SS]Here, CC is the first tw
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