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Learn the IP routing process step-by-step

(method: Start-run--cmd), and after the command prompt (>) enters ping 1.1.1.5 when the "ping" command is executed by the computer, the TCP/IP stack invokes the "ICMP" protocol encapsulation of the Internet layer of the Protocol stack Ping 1.1.1.5 "this request.The ICMP protocol is encapsulated as follows: ICMP header (Host a) Ping 1.1.1.5 Host A, to send a request encapsulated by this ICMP protocol to target Host B (Host B), the request must be "transported" using the I

Microsoft sync framework series (6): knowledge in the Microsoft synchronization framework)

In the previous section, we said that knowledge is the metadata (metadata) in Microsoft sync framework. This metadata is used to describe all changes applied to replica. These changes are either direct, or through synchronization. MSF uses knowledge to enumerate changes and conflict detection. Change enumeration and Conflict Detection generally compare the versions of the same item in two copies. A typical practice is that destination sends the ve

Cisco switch Port Mirroring configuration

Mirror Port configurationMost switches support mirroring technology, which allows for easy troubleshooting of the switch. We call it "mirroring" or "Spanning". Mirroring is the copying of traffic from one port on the switch to the other (mirror port) for monitoring.CISCO3550 can be configured with 2 mirror portsCase: Mirroring Port 2~5 to Port 61. Mirror Port configurationSwitch>enableSwitch#conf T STEP3: Configure the image source, either a port or a VLANSwitch (config) #monitor session 1 Sourc

FAT AP v200r005 Configuration Two layer transparent mode (web& command line, start)

-profile ID 0Service-set ID 1 Actual configuration: Command line configuration:[Huawei]dis current-Configuration # HTTP Secure-server ssl-Policy default_policy HTTP server enable# clock timezone Bei Jing time Add ,:xx:xx# DNS Resolve #vlan batch123 2001#lldp enable #pki Realm default enrollment self-SIGNED#SSL policy default_policy type server PKI-Realm DEFAULT#AAA Authentication-Scheme Default Authorization-Scheme default Accounting-scheme Default domain Default dom

Log4j output to system logs and emails

);Sync (0 );# The default action of syslog-ng 1.6.0 is to log a stats line# To the file every 10 minutes. That's pretty uugly after a while.# Change it to every 12 hours so you get a nice daily update# How many messages syslog-ng missed (0 ).Stats (43200 );Create_dirs (yes );};Source s_internal {internal ();};Destination d_syslognglog {file ("/var/log/syslog-ng.log ");};Log {source (s_internal); destination

Install syslog-ng management logs

: @ Version: 3.3.5 @ Include "SCL. conf" Options { # Long_hostnames (off ); Log_msg_size (8192 ); Flush_lines (1 ); Log_1_o_size (20480 ); Time_reopen (10 ); Use_dns (yes ); Dns_cache (yes ); Use_fqdn (yes ); Keep_hostname (yes ); Chain_hostnames (NO ); # Chain_hostnames (off ); Perm (0644 ); Stats_freq (43200 ); }; Source s_internal {internal ();}; Destination d_syslognglog {file ("/var/log/syslog-ng.log ");}; Log {source (s_internal);

Iptables Configuration Learning notes in Linux

preferred position in the netfilter processing process of the package, and there is a diagram that clearly depicts the processing process of the NetFilter package (which is excerpted from the Internet and who the author is, In this respect! In general, we do not use this mangle table, here we do not introduce. You can see, prerouting this chain at the front, when a packet came to the Linux network interface before the mangle prerouting, then Nat prerouting, from the name of the chain we can

Linux-iptables-route-rule

/etc/iproute2/rt_tables, you can manually edit the routing rules IP rule for routing, according to the routing rules to match, By priority (PREF) match from low to high until a suitable rule is found, it is necessary to configure the default route in the app.The IP rule show shows the routing rules.Add a route rule:# IP rule add from 192.168.1.10/32 table 1 pref 100If the pref value is not specified, it will be inserted before the existing rule minimum ordinalNote: After creating the routing rul

Optional attributes of the OracleDataGuardLOG_ARCHIVE_DEST_n Parameter

In the routine configuration process of oracledatabasepolicuard, set affsert, noaffrem, DB_UNIQUE_NAME, DELAY, L in the LOG_ARCHIVE_DEST_n initialization parameter. In the routine configuration process of Oracle Database Data Guard, set affsert, noaffrem, DB_UNIQUE_NAME, DELAY, L in the LOG_ARCHIVE_DEST_n initialization parameter. In the routine configuration process of Oracle Database Data Guard, set affsert, noaffrem, DB_UNIQUE_NAME, DELAY, LOCATION, SERVICE, SYNC, ASYNC in the LOG_ARCHIV

EJB _ message-driven bean Development

Develop message-driven Bean JavaJava messageservice) Java Message Service (JMS) is a developer-neutral API used to access enterprise message systems. The Enterprise message system can assist application software in message interaction over the network. The JMS programming process is very simple. In summary, application a sends a message to a certain destination of the Message Server, and then the Message Server forwards the message to application B. B

ActiveMQ Run case

Javax.jms.messageproducer;import javax.jms.Session; Import Javax.jms.textmessage;import Org.apache.activemq.activemqconnection;import org.apache.activemq.activemqconnectionfactory;/** * Message producer * * @author Babylon * 2016-5-9 */public class JMSProducer {Priv Ate static final string USERNAME = activemqconnection.default_user;//Default connection user name private static final String PASSWORD = Activ emqconnection.default_password;//default connection password private static final String

Ejb_ message-Driven development bean

Message-Driven Development beansJava Information Services (Java Messageservice)Java Information Services (Java Message Service, referred to as JMS) is a developer-neutral API for visiting enterprise messaging systems.The Enterprise messaging system can assist the application software to interact with the message over the network.The programming process for JMS is very easy to summarize: Application A sends a message to a message server's target (Destination

NAT basic IP address conversion Principle

NAT basic IP address conversion PrincipleIn general, the NAT address translation process is the conversion process between the "local address" and "Global Address", whether the packets are sent from the internal network to the external network, or from the external network to the internal network. The difference is that the network corresponding to the local address and global address is different, and the source and destination addresses of data pack

[FAQ series] How to Prevent Network Attacks through traffic control

processing. Mem: 548524 K used, 485956 K free, 0 K shrd, 0 K buff, 308564 K cachedCPU: 3.8% USR 3.6% sys 0.0% nice 0.0% idle 0.0% Io 8.0% IRQ 84.5% softirqLoad average: 4.05 2.96 1.41PID ppid user stat vsz % mem % CPU command3 2 root RW 1004 974 root s 493 m 48.7 5.1 swch936 2 root SW 0 0.0 3.0 [dispatch_timer]946 944 root s 5176 0.5 1.7 nets988 963 root s 37668 3.6 0.7 mpmo1490 Timer: delayed Timer issued. evid = FFFF, Rec = 10bf, dups = 7852 root R 3060 0.3 0.7 top973 960 root s 62568 6.0 0.5

Netanalyzer Note ii. Simple protocol analysis

information monitoring sign of the physical layer at any time, understanding the busy situation of the channel and realizing the management of the data link.The Ethernet header format, shown in 2.3, has a total of 14 bytes in the header of 112 bits and five fields.Figure 2.3Ethernet Header FormatDescription of the Ethernet frame field Field Length (bit) Description Destination hardware addresses (

Front-end Learning HTTP data transfer

xdirectory [1] client processing [2] hub processing [3] Router 1 processing [4] Router 2 processing [5] switch handling [6] server processing [7] Reverse transfer frontIn the previous article, the Network Foundation was introduced. This article will detail the transfer process of the data in the network when the client browses the Web abc.com.For example, PC1 accesses a Web page located on the server through the HTTP protocol. So, how does the Web data be transmitted in the network? Here are the

Syslog-ng Detailed installation configuration

[Root@server2 syslog-ng-3.0.5]# Mkdir/usr/local/syslog-ng/var [root@server2 syslog-ng-3.0.5]# CP contrib/syslog-ng.conf.redhat/usr/local/syslog-ng/etc/[Root@server2 syslog-ng-3.0.5]# CP modules.conf scl.conf/usr/local/syslog-ng/etc/[Root@server2 syslog-ng-3.0.5]# CP Contrib/init.d.redhat/etc/init.d/syslog-ng [Root@server2 syslog-ng-3.0.5]# cd/usr/local/syslog-ng/etc/[ Root@server2 etc]# mv Syslog-ng.conf.redhat syslog-ng.conf [root@server2 etc]# cat syslog-ng.conf @version: 3.0 Options {L Ong_h

Detailed routing Table

Routing Table description------------------------------------------------------------------------Source:------------------------------------ -----------------------------Active Routes:Network Destination Netmask Gateway Interface Metric0.0.0.0 0.0.0.0 192.168.123.254 192.168.123.88 10.0.0.0 0.0.0.0 192.168.123.254 192.168.123.68 1127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1192.168.123.0 255.255.255.0 192.168.123.68 192.168.123.68 1192.168.123.0 255.255.2

JMS (Java Messaging service) learns a

. This way, even if the Subscriber is not activated (running), it can receive the message from the publisher.(4), publish/Subscribe message Model Diagram:V. Receive messagesIn JMS, the receipt of a message can be used in the following two ways:1. Synchronous mode: The message Subscriber calls the receive () method when the message is received synchronously. In receive (), the message does not arrive or until the specified time is reached, and the method blocks until the message is available.(1),

Iptables firewall,

) [!] -- Destination-d address [/mask] [...] destination specification [!] -- In-interface-I input name [+] network interface name ([+] for wildcard) network interface name (followed by network interface, such as eth0) -- jump-j targettarget for rule (may load target extension) target rule -- goto-g chain jump to chain with no return -- match-m matchextended match (may load extension) -- numeric-nnumeric ou

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