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Analysis of University campus network implementation in Linux

eth0.13 up       IV. configure dialing 1. create a cqs dial-up network:    (1) create a dialing script file:/etc/ppp/dialisp1    #! /Bin/sh    /Usr/sbin/pppd/dev/ttyS0 115200 connect '/usr/sbin/chat-f/etc/ppp/chat95788 'login user 95788 mru 1500 mtu 1500 crtscts file/etc/ ppp/options. pstn_isp1    (2) create a session file for dialing:/etc/ppp/chat95788    "" OK ate1v1 OK atdt95788 CONNECT

Dynamic Loading Mechanism in Android

showBanner () {Toast. makeText (mActivity, "I'm the ShowBannber method", 1500 ). show () ;}@ Overridepublic void showDialog () {Toast. makeText (mActivity, "I'm the ShowDialog method", 1500 ). show () ;}@ Overridepublic void showFullScreen () {Toast. makeText (mActivity, "I'm the ShowFullScreen method", 1500 ). show () ;}@ Overridepublic void showAppWall () {Toa

The WEB Front-end allows you to crop and upload images.

the original readImgFile. doReadImgFile (file, $ img, $ container, rotateDeg);} // else use canvas to rotate else {RotateDeg = orientation === 6? 90 * Math. PI/180: orientation = 8? -90 * Math. PI/180: orientation = 3? 180 * Math. PI/180: 0; handler. doReadImgFile (file, $ img, $ container, rotateDeg );}});} After knowing the angle, you can use canvas for processing. The following compressed image is described, because canvas is also used for compression. 2. compress the image You can use canva

Linux NIC advanced commands, IP aliases, and multi-NIC bindings

Link encap:local Loopback inet addr:127.0.0.1 mask:255.0.0.0 inet6 addr:.: 1/128 Scope:host Up LOOPBACK RUNNING mtu:16436 metric:1 RX packets:167 errors:0 dropped:0 overruns:0 frame:0 TX packets:167 errors:0 dropped : 0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:14861 (14.5 KiB) TX bytes:14861 (14.5 KiB)At this point our eth0 network card information will be displayed, we at this time through the IP comman

The size of the packet sent by the TCP and UDP protocols

Reproduced from: http://blog.chinaunix.net/uid-20180960-id-2998594.html, thank the author. When it comes to UDP programming, the easiest question we can think about is how many bytes are sent at a time? Of course, this does not have the only answer, compared to different systems, different requirements, the answer is not the same, here just like the ICQ type of sending chat messages to analyze, for other cases, may also get a little help:First, we know that TCP/IP is often considered a four-lay

"Go" a Linux command per day (round): ifconfig command

:192.168.120.255 mask: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 d

A Linux command (per day): Ifconfig command

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

UDP Baochang Advice _ Learning Notes

In the UDP programming, we are most likely to think of the problem is how many bytes to send a good? Of course, this does not have the only answer, compared to different systems, different requirements, the answer is not the same, I am here only for Like the ICQ type of sending chat messages to analyze the situation, for other situations, you may also be able to get a little help: First of all, we know that TCP/IP is usually considered to be a four-layer protocol system, including link layer, ne

IP Address Configuration of RHEL in VLANTrunk Mode

Today, we got our two-cage Blade Machine and installed the RHEL6U3 system. After installing the First Blade, we planned to configure it as a KICKSTART server to install other blades over the network. Read more: RHEL network-based Blade Server Installation. 1. First, check the number of NICs [root @ blog01 Today, we got our two-cage Blade Machine and installed the RHEL6U3 system. After installing the First Blade, we planned to configure it as a KICKSTART server to install other blades over the ne

Ws-c3550-24-emi Configuration

ip address!Interface GigabitEthernet0/1No ip address!Interface GigabitEthernet0/2No ip address!Interface Vlan1Ip address 172.16.160.1 255.255.255.128!Interface Vlan2Ip address 172.16.161.1 255.255.255.128!Interface Vlan3Ip address 172.16.162.1 255.255.255.128!Interface Vlan4Ip address 172.16.163.1 255.255.255.255.128!Router ripVersion 2Network 172.16.0.0!Ip default-gateway 172.16.160.246Ip classlessIp route 0.0.0.0 0.0.0.0 172.16.160.246No ip http server!!!!Line con 0LoginLine vty 0 4Password c

The relationship between MSS and MTU

The relationship between MSS and MTUTu:maximum transmission Unit, the maximum transmission unit, is specified by hardware, such as an Ethernet MTU of 1500 bytes.Mss:maximum segment size, the maximum section size, is the maximum data fragment size for each transmission of a TCP packet, typically by sending end-to-end TCP to notify the peer to the maximum TCP data that can be sent in each subsection. The MSS value is the MTU value minus the IPv4 header

802.3 and Ethernet frame structure-routing switching principle 1-"Hcna notes"

1. RAW 802.3 frame Format leading field Frame start character Length Data FCS 7 bytes 1 bytes 6 bytes 6 bytes 2 bytes 46-1500 bytes 4 bytes Leading fields: each frame begins with a 7-byte leading field, consisting of 0-, 1-spaced code that notifies the target to receive preparation (10101010 10101010 10101010 10101010 1010

Animation effect (i)-gradient animation

from transparent to opaque.2.1.1 XML defining transparent animationsDefines transparent animations through XML, resCreate a new one under anim目录 this directory, and xml文件 Define animation effects,set xmlns:android="http://schemas.android.com/apk/res/android"> alpha android:fromAlpha="0.0" android:toAlpha="1.0" android:duration="1500" android:interpolator="@android:anim/linear_interpolator"/>set> The various prope

FFmpeg parameter description

small, if you want to hear high-quality sound, we recommend that you set it to 160 kbps (80) or above -Vol to set the volume. For some DVDRip, the AC3 track volume is very small, this can be used to increase the volume during conversion. For example, 200 is twice the original volume. to get a high-definition MP4 with low-volume sound quality, it is best not to use a fixed bit rate for the image first, the VBR parameter is used to determine the

Data Mining notes (III)-data preprocessing

value. That is, the interval range of each box is a constant called the box width. User-defined intervals: You can customize intervals as needed. This method can be used to help you easily observe the data distribution within certain intervals. For example, the value of the customer's income attribute income after sorting (RMB): 800 1000 1200 1500 1500 1800 2000 2300 2500 2800 3000 3500 4000 4500. The binn

Size of data packets sent by TCP and UDP protocols

During UDP programming, the most common question is how many bytes are sent at a time? Of course, there is no unique answer. The answer is different from the requirements of different systems. Here we only analyze the situation of sending chat messages like ICQ, in other cases, you may be able to get some help: First, we know that TCP/IP is generally considered as a layer-4 protocol system, including the link layer, network layer, transport layer, and application layer. UDP belong to the transp

Modify the Ubuntu Nic name

[Email protected]:/sys/class/net$ ifconfigENP0S25 Link encap:ethernet HWaddr f0:de:f1:16:a4:98Up broadcast multicast mtu:1500 metric:1RX packets:0 errors:0 dropped:0 overruns:0 frame:0TX packets:0 errors:0 dropped:0 overruns:0 carrier:0collisions:0 txqueuelen:1000RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)Interrupt:20 memory:f2500000-f2520000Lo Link encap:local Loopbackinet addr:127.0.0.1 mask:255.0.0.0Inet6 addr::: 1/128 scope:hostUp LOOPBACK RUNNING mtu:6

Introduction to oracle11g online redefinition (onlineredefinition)

on users; User created. SQL> GRANT CREATE SESSION, CREATE ANY TABLE, ALTER ANY TABLE, 2 drop any table, lock any table, select any table, 3 create any index, CREATE ANY TRIGGER 4 to tj; Grant succeeded. SQL> GRANT EXECUTE_CATALOG_ROLE TO TJ; Grant succeeded. 2. Log On with the TJ user and create a table DEMO. As the original table for online redefinition, add a primary key and an index to the table. SQL> conn tj/tj Connected. SQL> create table demo as select empno, ename, sal, deptno from scott

PHP timestamp using instance code

We 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 router VLAN configuration (1)

enablepass $1 $ FMFQ $ HfZR5DUszVHIRhrz4h6V70Set prompt Console>Set length 24 defaultSet logout 20Set banner motd ^ C!# SystemSet system baud 9600Set system modem disableSet system name 5500CSet system locationSet system contact!# IpSet interface sc0 1 10.230.4.240 255.255.255.0 10.230.4.255 Set interface sc0 upSet interface sl0 0.0.0.0 0.0.0.0Set interface sl0 upSet arp agingtime 1200Set ip redirect enableSet ip unreachable enableSet ip fragmentation enableSet ip route 0.0.0.0 10.230.4.15 1Set

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