passing acls

(Forbidden) Protocol Source IP address/network segment Anti-mask destination IP address/network segment anti-mask eq Port ****** Prohibit a network segment (source network segment) under a protocol (or a port) access to the B segment (destination network segment) router (config) #access-list table number permit ip any Any note: Extended ACLs By default all networks are also set to prohibit, so other network segments should be released. ro

Concept first from the concept of the various functions of the method and the difference: 1, the value of the transfer: The parameter is a copy of the argument, changing the value of the function parameter does not affect the value of the external argument, this is the most commonly used as a method of communication, but also the simplest method of transfer, only need to pass parameters, return value that is , pointer passing: A pointer

Set what permissions a user has on the fileGetfacl[[email protected] ~]$ getfacl mic/ View ACL for this file# file:mic/# Owner:job# Group:jobUser::rwxuser:tom:rw-Group::---mask::rw-Other::---[[email protected] ~]$ Setfacl-xu:tom mic Cancel all permissions for this user[Email protected] ~]$ Getfacl mic/# file:mic/# Owner:job# Group:jobUser::rwxGroup::---Mask::---Other::---[email protected] ~]$ setfacl-mg:admin:rwx mic/ Setting the group's ACL[Email protected] ~]$ Getfacl mic/# file:mic/# Owner:j

A = 5 System. out. println ("first output:" + System. out. println ("third output:" + swap (a = 10 System. out. println ("second output:" +} Third output: 5 Check that, although the value of a is changed in the swap method, the value of variable a in the main method remains unchanged. This verifies the above, if the basic data type is passed, the parameter value is changed in the method, but the actual parameter value cannot be changed... Here I also want to explain that the String type does no

There are three parameters passed in C + +: Passing the parameter value, passing the parameter address, and passing the reference to the parameter.First, concept decomposition1. Value2. PointersA pointer is essentially a variable that holds the address of a variable, logically independent, and can be changed, including the change in the address it points to and t

the value of the reference can not be changed)The reference cannot be null, the pointer can be empty;The "sizeof reference" gets the size of the variable (object) to which it is pointed, and the "sizeof pointer" gets the size of the pointer itself;The value of the pointer and the reference of the self increment (+ +) operation is different;is type-safe, and pointers are not (references have more type checks than pointers) about references: References introduce a synonym for an object. The prese

Original link: http://www.cnblogs.com/yanlingyin/Value Passing :The parameter is a copy of the argument, and changing the value of the parameter does not affect the value of the external argument. From the point of view of the called function, the value pass is one-way (argument-and-parameter), the value of the argument can only be passed in,cannot be outgoing. The value is passed when the parameter needs to be modified inside the function and you do

To understand the difference between value passing, pointer passing, and reference passing, the main purpose is to understand the arguments and parameters of the function, the scope of the function (automatic variables, stacks), the layout of the memory, and the characteristics of pointers and references. Here the main summary of the three kinds of parameter tran

Tag: Operation returns TOR tool processing source Address object calling function resRecently wrote several deep-seated articles on arrays and pointers, which referred to "C, where all non-array formal parameter passes are in value-passed form"Semantic "traps"---arrays and pointersThere will be misunderstandings about value passing, pointer passing, and reference passin