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Configure jumbo frame for RAC optimization and jumboframe for rac Optimization

Configure jumbo frame for RAC optimization and jumboframe for rac Optimization Configure jumbo frame for RAC Optimization) First, let's talk about the concept of MTU: in network communication, there is a concept of MTU (Max Transmission Unit), that is, the maximum frame size in network Transmission, the default value is 1500 bytes (the Ethernet Variable frame size is 46-1500Byte ). [Root @ node1 ~] # Ifconfig bond0 Bond0 Link encap: Ethernet HWaddr C8

PHP timestamp example

ForWe will surely encounter this situation: Bank A and Bank B open your account almost simultaneously and see the original 1000 yuan deposit in your account, then both banks want to add a deposit of 500 yuan to your account. Then, Bank A will change 1000 yuan to 1500 Yuan, and Bank B will also change 1000 yuan to 1500 yuan. This is terrible! In the end, your bank account has only

CISCO technology set 6

24 default Set logout 20 Set banner motd ^ C ! # System Set system baud 9600 Set system modem disable Set system name 5500C Set system location Set system contact ! # Ip Set interface sc0 1 10.230.4.240 255.255.255.0 10.230.4.255 Set interface sc0 up Set interface sl0 0.0.0.0 0.0.0.0 Set interface sl0 up Set arp agingtime 1200 Set ip redirect enable Set ip unreachable enable Set ip fragmentation enable Set ip route 0.0.0.0 10.230.4.15 1 Set ip alias default 0.0.0.0 ! # Command alias ! # Vtp Set

UDP (packet length, packet collection capability, packet loss and process structure selection)

determined by the physical characteristics of the Ethernet. This 1500 byte is called the MTU (maximum transmission unit) of the link layer ). The Internet Protocol allows IP sharding so that data packets can be divided into small fragments to pass through links with the maximum transmission unit smaller than the original size of the data packet. This fragment process occurs at the network layer. It uses the value of the maximum transmission unit that

Introduction to Internet protocols

counted as a group? What's the point of each signal bit? This is the function of the "link layer", which determines how 0 and 1 are grouped above the "solid layer". 3.2 Ethernet Protocol In the early days, each company had its own way of grouping electrical signals. Gradually, a protocol called "Ethernet"(Ethernet) occupies a dominant position. Ethernet requires that a set of electrical signals constitute a packet called "frame". Each frame is divided into two parts: header (head) and data.

Python Learning day3--Network-based network protocol chapter

sectionsHead contains: (fixed 18 bytes) Sender/Source Address, 6 bytes Recipient/Destination Address, 6 bytes Data type, 6 bytes Data contains: (minimum 46 bytes, maximum 1500 bytes) Details of the packet Head length +data length = Shortest 64 bytes, up to 1518 bytes, over maximum limit on shard send MAC Address: Ethernet Specifies that devices that are connected to the Internet

One Linux command per day (ifconfig): command

:255.255.255.0#p# page title #e#Up broadcast RUNNING multicast mtu:1500 metric:1RX packets:8700857 errors:0 dropped:0 overruns:0 frame:0TX packets:31533 errors:0 dropped:0 overruns:0 carrier:0collisions:0 txqueuelen:1000RX bytes:596390239 (568.7 MiB) TX bytes:2886956 (2.7 MiB)Lo Link encap:local Loopbackinet addr:127.0.0.1 mask:255.0.0.0Up LOOPBACK RUNNING mtu:16436 metric:1RX packets:68 errors:0 dropped:0 overruns:0 frame:0TX packets:68 errors:0 drop

Ifconfig detailed explanation of Linux commands

will receive all multicast packets in the network-A displays all interface information-S Display summary information (similar to netstat-i)Add to configure the IPV6 address for the specified NICDel deletes the IPV6 address of the specified network cardmtunetmaskTunel establishing a tunnelDSTADDR set a remote address to establish point-to-point communication-broadcast-pointtopointMulticast setting the multicast flag for the network cardAddress sets IPV4 addresses for network cardstxqueuelen4. Us

Linux command--52 ifconfig (GO)

interface.The ARP setting specifies whether the NIC supports the ARP protocol.-promisc sets whether the promiscuous mode of the NIC is supported, and if this parameter is selected, the NIC will receive all packets sent to it in the network-allmulti Settings Support multicast mode, if you select this parameter, the NIC will receive all multicast packets in the network-A displays all interface information-S Display summary information (similar to netstat-i)Add to configure the IPV6 address for th

PHP Timestamp uses instance code _php basics

We are bound to encounter a situation where Bank A and bank B open your account almost at the same time and see the original 1000 Yuan deposit on your account, and both banks want to add a 500 yuan deposit to your account. Then, bank A will change 1000 yuan to 1500 yuan, at the same time, Bank B will also change 1000 yuan to 1500 yuan. This is going to be a bad thing! Finally, your bank account at the end o

Java Exercises 2

1. Enter your own salary to calculate the personal income tax: according to the current tax rate (find your own tax rate) public static void Main (string[] args) {System.out.println ("Please enter your salary:");Scanner sc=new Scanner (system.in);Double money=sc.nextdouble ();Double total=0.0;total=money-3500;Double revenue=0.0;if (totalSystem.out.println ("Congratulations, no watering");}else if (totalrevenue=total*0.03;}else if (total>1500totalrevenue=1500

How to Invest. CN earn 10 Tens of thousands of (Blind kan) but must see!!

I feel the same way, but. cn domain name has been cnnic do rotten, in fact, it seems that this is not a personal webmaster anything, in the end, in fact, or cinnic! OK, back to the theme, talk about my investment in some ideas, I have done Oh! Did you have a note today? Oh please look down I have been crazy registering more than 1500 these days is not very bad. cn Domain Name purpose is to do garbage station! Oh, I now have more than 10 servers on e

Linux Common commands: ifconfig command

:255.255.255.0Up broadcast RUNNING multicast mtu:1500 metric:1RX packets:8700857 errors:0 dropped:0 overruns:0 frame:0TX packets:31533 errors:0 dropped:0 overruns:0 carrier:0collisions:0 txqueuelen:1000RX bytes:596390239 (568.7 MiB) TX bytes:2886956 (2.7 MiB)Lo Link encap:local Loopbackinet addr:127.0.0.1 mask:255.0.0.0Up LOOPBACK RUNNING mtu:16436 metric:1RX packets:68 errors:0 dropped:0 overruns:0 frame:0TX packets:68 errors:0 dropped:0 overruns:0 c

Java implementation of network monitoring

Network//Tcpserver.java by Fpont 3/2000 //Usage:java tcpserver //default port is 1500. //connection to is closed by client. //This server handles only 1 connection. import java.net.*; import java.io.*; public class TCPServer { public static void Main (String args[]) { int port; ServerSocket Server_socket; BufferedReader input; try { port = integer.parseint (Args[0]); } catch (Exception e) { System.out.println ("port =

Linux platform Dual-NIC binding technology for load balancing (NIC aggregation) bonding

Up interface Bond0 OKBringing Up interface eth0 OKBringing Upnbsp;interface eth1 OK................Below we discuss the following mode for 0, 1 o'clock, respectively.mode=1 operation in the main standby mode, then eth1 as the Backup network card is no ARP[email protected] network-scripts]# ifconfig Verify the configuration information of the NICBond0 Link encap:ethernet HWaddr 00:0e:7f:25:d9:8binet addr:172.31.0.13 bcast:172.31.3.255 mask:255.255.252.0Up broadcast RUNNING MASTER multicast mtu:

Xen Virtualization Advanced real-time migration of virtual machines under Xen platform _xen

network card device: # VIM Ifcfg-eth0 device= "eth0" bootproto= "static" Hwaddr= "08:00:27:6a:9d:57" nm_controlled= " No" onboot= "Yes" Bridge= "Xenbr0" type= "Ethernet" userctl= "No" 3. Configuring bridging mode requires the NetworkManager service to be turned off: All two nodes need to operate #chkconfig NetworkManager off #service Restart the Network service after NetworkManager stop configuration: #service Network Restart 4). Login terminal to view bridge status: #

Use of Xen virtual machines: Start, close, pause, reply, reboot, enter terminal, etc.

Use of Xen virtual machines (i) using virtual machine profiles and disk files to manually start the virtual machine system After the virtual machine system is created, the virtual system will start up and use the XM List command to see all the virtual machines that are started , but the next time we restart the system, we will not see the virtual machines created with the XM list . the network device for the virtual machine is not visible in the network device . At this point we need to manua

Cisco router configuration manual Virtual LAN (VLAN) routing

system modem disableset system name 5500 Cset system locationset system contact! # Ipset interface sc0 1 route 255.255.255.0 255.set interface sc0 upset interface sl0 0.0.0.0 255.interface sl0 upset arp agingtime 1200 set ip redirect enableset ip route enableset ip fragmentation enableset ip route 0.0.0.0 255.1 set ip alias default 0.0.0.0! # Command alias! # Vtpset vtp domain hneset vtp mode serverset vtp v2 disableset vtp pruning disableset vtp pruneeligible 2-1000clear vtp limit 1001-1005 se

Android APK credit limit cracking instance

Recently, I used an online music listening software, which has many good stories for children. However, online music often experiences intermittent disconnection, and the software requires more than 1500 credits to download the entire page. To meet the credit conditions, you need to manually install dozens of recommended applications. Therefore, the attack is decided. If the name of apkis mytest.apk, perform the following steps: Step 1: Obtain the res

CCF 201612-2 Payroll calculation Java Problem solving

  Problem description   Xiao Ming's company every month to pay Xiao Ming, and Xiao Ming received wages for the payment of personal income tax after the wages. Assuming that his one-month pre-tax salary (after deducting five of the risk of a gold, not withholding tax before the wages) is S-yuan, then he should pay the personal income tax according to the following formula calculation:1) Personal income tax threshold of 3500 yuan, if S not more than 3500, then do not pay taxes, more than 3500 yuan

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