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BIND: no more. Since the invention of Paul Mockapetris in 1983, it has become the de facto standard of DNS in the Internet. ISC (Internet Software Consortium) is responsible for maintenance. Nominum (www.nominum.com) company to complete, BIND 9. x is a free software, Solaris standard configuration, even in China Telecom, most of the use of bind8.x/9.x. However, in October 21, 2002, The Denial-of-Service (DoS) attack against 13 DNS Root-domain servers

number is 14. What if it is 20000 elements? Up to 15 times. As you can see, when the data size doubles, the number of searches is only one more time, and the search time is 1/14 more. After you understand this truth, you can put elements in it with peace of mind. Finally, for map and set winter, we need to mention their efficiency comparison with a C language packaging library. On many UNIX and Linux platforms, there is a library named ISC, which pro

routers 192.168.1.254;Option subnet-mask limit 255.0;Option broadcast-address 192.168.1.255;Option domain-name-servers 192.168.1.3;Option domain-name "www.cao.com"; # DNS name #Option domain-name-servers 192.168.1.3;Option time-offset-18000;Range dynamic-BOOTP 192.168.1.128 192.168.1.255;Default-lease-time 21600;Max-lease-time 43200;Host NS {Hardware Ethernet 52: 54: AB: 34: 5b: 09; # MAC address of the network interface running DHCP #Fixed-address 192.168.1.9;}} Ii. Create a customer Lea

, including forward and reverse zone files# D. Configure the parsing file resolv. conf# E. Start the dns Service[Root @ node1 ~] # Cd/var/named/chroot/etc/# Use the following method to copy and modify two new copies. The parameter-p indicates that the two copies are copied together with the permission and owner and the group. Do not ignore the parameter-p[Root @ node1 etc] # cp-p named. caching-nameserver.conf named. conf[Root @ node1 etc] # cp-p named. rfc1912.zones named. zones# Modify the nam

. Configure the named. conf file # C. Configure the zone file, including forward and reverse zone files # D. Configure the parsing file resolv. conf # E. Start the dns Service [Root @ node1 ~] # Cd/var/named/chroot/etc/ # Use the following method to copy and modify two new copies. The parameter-p indicates that the two copies are copied together with the permission and owner and the group. Do not ignore the parameter-p [Root @ node1 etc] # cp-p named. caching-nameserver.conf named. conf [Root @

D. We need to perform different operations based on different combinations of permissions. Public static final int PASS_BY_A = 1; // 0001 public static final int PASS_BY_ B = 2; // 0010 public static final int PASS_BY_C = 4; // 0100 public static final int PASS_BY_D = 8; // 1000 public static final int PASS_BY_ABCD = PASS_BY_A | PASS_BY_ B | PASS_BY_C | PASS_BY_D; // 1111/*** @ param args */public static void main (String [] args) {boolean isA = false; boolean isB = false; boolean

Document directory Set the workspace location to the current working directory Use-data to set a specific workspace location Use-VM to set Java VM Run eclipse on j9 Run eclipse on IBM developer kit, Java (TM) technology edition VM Eclipse.exe-vmargs-xverify: None-XX: + useparallelgc-XX: permsize = 20 m-xms64m-xmx256mSet the workspace location to the current working directory In this solution, the workspace location is calledWorkspaceDirectory. The easiest way to achieve this is to use t

D. We need to perform different operations based on different combinations of permissions. Public static final int pass_by_a = 1; // 0001 public static final int pass_by_ B = 2; // 0010 public static final int pass_by_c = 4; // 0100 public static final int pass_by_d = 8; // 1000 public static final int pass_by_abcd = pass_by_a | pass_by_ B | pass_by_c | pass_by_d; // 1111/*** @ Param ARGs */public static void main (string [] ARGs) {Boolean ISA = false; Boolean ISB = false; Boolean

:\Windows\Sysnative\test.txt 0x06 Summary When a 32-bit program is executed in a 64-system, if you have operations on the registry and files, the redirection details must be considered. Registry operation: AccessHKLM\Software\The actual path isHKLM\Software\Wow6432Node\ File Operations: Accessc:\windows\Sysnative\The actual path isc:\windows\system32\Accessc:\windows\system32\The actual path isc:\wind

total number of all la S isC (M-12N-1) * C (4,1)The total number of mines in point A is 0. Scenario 2: The total number of all la S isC (M-12N-2) * C (3,1)*C (3,1)Type, where the total number of mines on point A isM-12,N-2 )*C (1,1)* C (3,1)Type. So P (A) =M-12,N-2 )*C (1,1)* C (3,1)/[C (M-12N-2) * C (3,1)*C (3,1)] From the above formula, we can see that P (a) has a relationship with total number N, wh

DHCPD is a DHCP server in Linux ,:Https://www.isc.org/software/dhcp After the download is completeTar-zxvf dhcp-4.2.1-P1.tar.gz./ConfigureMakeMake install Edit the/etc/DHCPD. conf fileDdns-Update-style none;Subnet 192.168.66.0 netmask 255.255.255.0 {Option routers 192.168.66.1;Option subnet-mask limit 255.0;Option domain-name "wayos ";Option domain-name-servers 61.139.2.69;Range 192.168.66.2 192.168.66.254;Default-lease-time 600;Max-lease-time 7200;} 192.168.66.0 is the network segment of the ho

?If you know the relationship between log2, you should thoroughly understand this answer. In map and set, binary lookup is used. That is to say, if there are 16 elements, you can find the result by comparing up to 4 times. There are 32 elements, up to 5 times. What about 10000? The maximum number of comparisons is log10000, and the maximum number is 14. What if it is 20000 elements? Up to 15 times. As you can see, when the data size doubles, the number of searches is only one more time, and the

etc] # cp-P named. caching-nameserver.conf named. conf[Root @ Server etc] # cp-P named. rfc1912.zones named. rfc1912.zones. BakNote: In addition to copying the source file content, the CP parameter-P also copies the modification time and access permissions to the new file.Here, the owner of most configuration files is root and the group is named. If it is only CP, it will be reported when the named service is started.Error.[Root @ Server etc] # vi named. conf//// Named. caching-nameserver.conf/

cached. Step 4-install msysgit and tortisegit 1. The next step is to install msysgit. Assume that your path isC: \ msysgit 2. Install tortisegit. 1. Click tortisegit-settings on the right of any website and set the git.exe path to c: \ msysgit \ bin, that is, the msysgit installation path. 2) Select network from the menu on the left, and set SSH clientto plink.exe in putty( for example, my path is c: \ Program Files \ putty \ plink.exe) 3. copy the f

There are three ways: 1, through $scope binding (not recommended) 2, through the object array binding 3, through the Key/value key value pair Binding implementation method: 1, through the $scope binding (not recommended): function Ctrl ($scope) {$ Scope.classname = "selected"; } 2, binding through an array of objects: function Ctrl ($scope) {$scope. isSelected = true;} When isSelected is true, the selected style is added, and when isSelected is false, the Add unselected style. 3. Bind by Key/val

Server queriesiterative queries: For DNS servers to query to other DNS serversDNS Query Flowchart:installation Bind Service program: [Email protected] ~]# yum-y install bind-chroot installed:bind:9.9. 4-el7 Dependency installed :9.9. 4-el7 complete!Domain Name Resolution service BIND 's program is called named .

At work, C、C++Inseparable and do our embedded aspect of course more isC, but sometimes they don't.C++, but isC、C++Mix-and-match (Mixed Programming) Together, for example,RtpVideo transmission,live555Multimedia playback, etc. areC++Under which he needed to callJrtplibLibrary, and then, for example, I sent that email, and I usedC++Written, defines an EMailObject that contains theMember:Send and receive email

1.tns-00525:insufficient Privilege for operation Started with pid=30869 listening on: (Description= (Address= (protocol=tcp) (host=ora11g) (port=1521)) Error Listening on: (Description= (Address= (PROTOCOL=IPC) (key=extproc1521)) Tns-12555:tns:permission denied Tns-12560:tns:protocol Adapter Error tns-00525:insufficient privilege for Operation Linux Error:1: Operation N OT permitted No longer listening on: (Description= (Address= (protocol=tcp) (host=ora11g) (port=1521 )) 2014-07-10 14:17:

look at the file directly and the contents are consistent with the crontab-l displayed by the corresponding user. [Root@dave cron]# Cat Oracle 6 * * */u02/scripts/del_st_archive.sh >/u02/scripts/del_st_arch.log 2>1 [Root@dave cron]# Cat Root 0 * * * */root/bin/sync-clock.sh [Root@dave cron]# Second, Crontab use instructions 2.1 Crontab Grammar Usage:crontab [-u user] File crontab [-u user] [-e |-l |-r] (default operation is replace, per 1003.2) -E (Edit user ' s crontab) -L (list us

Use of List The use of the list must include the header file #include 1), how to define a list object #include int main (void) { 　　list } 2, using the member functions of the list push_back and Push_front inserts an element into the list cList. push_back(‘a’); //把一个对象放到一个list的后面 cList. push_front (‘b’); //把一个对象放到一个list的前面 3, using the member function of list empty () to determine whether the list is empty if (cList.empty()) { 　　printf(“this list is empty”); } 4), using list list for(c