tcpd p2c

@ deep] # chmod 600/etc/inetd. conf Step 2: Make sure that the file owner is root. [Root @ deep] # stat/etc/inetd. conf Step 3: edit the "inetd. conf" file(Vi/etc/inetd. conf). disable all unnecessary services, such as ftp, telnet, shell, login, exec, talk, ntalk, imap, pop-2, pop-3, finger, and auth, and so on. If you find some services useful, do not disable them. However, if these services are disabled, the system may be more vulnerable to attacks. The content of the changed "inetd. conf" fi

@ deep] # stat/etc/inetd. confStep 3: edit "inetd. conf file (vi/etc/inetd. conf). Disable all unnecessary services, such as ftp, telnet, shell, login, exec, talk, ntalk, imap, pop-2, pop-3, finger, and auth, and so on.If you find some services useful, do not disable them. However, if these services are disabled, the system may be more vulnerable to attacks. The content of the changed "inetd. conf" file is shown below: the content is from www.chinahtml.com)# To re-read this file

Wait root internal #chargen Stream TCP nowait root internal #chargen dgram UDP Wait root internal #time Stream TCP nowait root internal #time dgram UDP Wait root internal # # These are standard services. # #ftp Stream TCP nowait ROOT/USR/SBIN/TCPD in.ftpd-l-A #telnet Stream TCP nowait ROOT/USR/SBIN/TCPD in.telnetd # # Shell, login, exec, Comsat and talk are BSD protocols. # #shell Stream TCP n

to 600. [root@deep]# chmod 600/etc/inetd.conf Step two: Be sure that the file owner is root. [root@deep]# stat/etc/inetd.conf Step three: Edit the "inetd.conf" file (vi/etc/inetd.conf) to prohibit all unwanted services, such as FTP, Telnet, shell, login, exec, talk, Ntalk, IMAP, POP-2, pop-3, Finger, auth, and so on. If you feel that some services are useful, you may not ban these services. However, by banning these services, the system is less likely to be attacked. The contents of the cha

node downtime recovery and message packet loss considerations?Assuming acceptor c is down for a period of time, the other acceptor has passed a resolution of V in the C outage period, but C is not known because of the outage; c if there is a proposer immediately after the resumption of the proposed value is not V, because the conditions P1,c will accept the proposal, This contradicts with the P2A. In order to avoid this situation, we are further constrained by the proposer:p2b. If a proposal wi

Refer to the previous article: paxos algorithm 1. 1. Number Processing According to P2c, Proposer will first consult the acceptor to view the maximum number and value it approves before deciding which value to submit. Previously, we have been emphasizing higher-numbered proposal without explaining how to handle low-numbered Proposal. | -------- Low number (L The correctness of P2c is guaranteed by the hig

allows you to parse your program to know which part of the program is most time-consuming during execution.Gprof will tell you the number of calls to each function in the program and the percentage of time each function is executed. This information is useful if you want to improve the performance of your program.To use gprof in your program, you must add the-pg option when compiling the program. this will make the program generate a gmon every execution. out file. gprof uses this file to gener

. -------------------------------------------------------------------------------- Tip: gprof generates a large amount of profiling data. If you want to check the data, you 'd better redirect the output to a file. -------------------------------------------------------------------------------- F2c and p2c F2c and

function. This information is useful if you want to improve your program's performance.In order to use GPROF on your program, you must add the-PG option when compiling the program. This causes the program to produce a file called gmon.out each time it is executed. Gprof Use this file to generate profiling information.After you run your program and generate a Gmon.out file, you can get profiling information using the following command:GprofParameter program_name is the name of the program that p

--turn from: {Old yards ' column}1. Numbering processingAccording to P2C, proposer will consult acceptor before the proposal to see the largest number and value of its approval before deciding which value to submit. We have previously emphasized the higher numbered proposal, without stating what to do with the low-numbered proposal.|--------low Number (lThe correctness of the P2C is by the current number n

Refer to the previous article: paxos algorithm 1. 1. Number Processing According to P2c , Proposer will first consult the acceptor to view the maximum number and value it approves before deciding which value to submit. Previously, we have been emphasizing higher-numbered proposal without explaining how to handle low-numbered Proposal. | -------- Low number (L P2c The correctness is guaranteed by the higher

Vsftpd:118.126.3.222:allow Indicates that a 118.126.3.222VSFTP connection is allowed Input Vim/etc/hosts.deny Edit Vsftpd:all Indicates that all VSFTP connections are denied In general, Linux will first Judge/etc/hosts.allow this file, if the remote login computer to meet the file/etc/hosts.allow settings, it will not be used/etc/ Hosts.deny file, on the contrary, if you do not meet the rules of Hosts.allow file set, you will use the Hosts.deny file, if the Hosts.deny rules, this host is limit

service process. On the contrary, if it is a single process, you can set it to wait. User identity indicates the uid/euid used when the service process starts. Because telnet can be issued by any user and any command can be executed through telnet, the root user identity is used. /Usr/sbin/tcpd is the program actually started. This program is actually a common TCP connection processing program. The parameter uses in. when telnetd is connected to a co