whether the problem is resolved. If the problem persists, continue until the fault disappears.
Layered Network diagnosis technology
Physical Layer faults mainly occur when the physical connection mode of the device is correct, the connection cable is correct, and the configurations and operations of devices such as Modem, CSU, and DSU are correct. The best way to determine whether the physical connection of a vro port is intact is to use the show int
from the host to the local router.2. Check two wide-area network ports.3. Check whether the host is connected to the WAN port of the Peer router.4. Check the Ethernet port of the host to the peer router.Use the telnet command to remotely log on to the peer vro, and check the LAN connection of the peer by checking the Ethernet port from the local host to the local vro.5. Repeat 3 and 4 to check the recipient's local location.6. After the above steps, the problem persists. Please contact your age
requirement. However, even if the download speed is 8 Mbits/s and the upload speed is 1 Mbits/s, our online on-demand movies, software downloads, and online chats will feel fast (hundreds of times more than normal dial-up Modem )! More importantly, using ADSL to access the Internet does not interfere with each other, and there is no need to make phone calls to access the Internet. Of course, the cost of ADSL is also very low (1). You do not need to p
difficulty in understanding SRP is in the case of a multifunctional class, which is not easy to understand the contradiction between versatility and single change. Let's take a look at a modem class example, modem has 4 functions: dial-up, hang up, send data, receive data:
class Modem { public void Dial(string aPno) {…} public void Hangup() {…} p
of a building, with the main function of accommodating a computer room and its maintenance area. The computer room is an important part of the data room, and the core data processing equipment is placed. Typical data center telecommunications spaces include: entry sites (ENTRANCE room), main distribution (MDA), horizontal distributions (HDA), regional distributions (ZDA), device distributions (EDA).
The following figure is a basic data center and a d
Let your parallel hard drive work under UltraDMA100 and UltraDMA133-Linux Enterprise Application-Linux server application information. The following is a detailed description. Author: BOBO123
The current motherboard and hard disk support UltraDMA 100, the old motherboard such as VIA 693, Intel 810 chipset motherboard only support UltraDMA 66, however, after VIA 694 and Intel 815, both chip boards support UltraDMA 100, and some VIA chip boards even support UltraDMA 133. When the motherboard, har
Signature method:
[Root @ test/root] # hdparm [-cdmxtt] [Register by name]
Data Description:
-C: provides an Access Mode of 32 bits. The supported regions include:
-C0: 32-bit Access Mode
-C1: Enable the 32-bit metadata access mode.
-C3: Enable the 32-bit meta access mode in sync mode (recommended value)
-D: whether to enable the DMA mode of the drive. The value 0 indicates the drive mode and the value 1 indicates the drive mode.
-M: Set the multiple sector I/O mode. Generally,
1. df command;
DF comes from the coreutils software package and comes with it during system installation. We can use this command to view the disk usage and the location where the file system is mounted;
Example:
[Root @ localhost beinan] # DF-lH
Filesystem capacity in use available % mount point
/Dev/hda8 11g 6.0g 4.4g 58%/
/Dev/SHM 236 M 0 236 m 0%/dev/SHM
/Dev/sda1 56G 22g 35g 39%/mnt/sda1
We can see that the system is installed in/dev/hda8; there is also a 56 GB disk partition/dev/sda1 m
manipulation tool from the Util-linux software package, and we'll just say how he looks at the partition table and the partition structure; parameter-l, which can get the partition of all the hard disks in the machine through the-l parameter;Code:
[Email protected] beinan]# fdisk-ldisk/dev/hda:80.0 GB, 80026361856 bytes255 heads, $ sectors/track, 9729 Cylindersun its = cylinders of 16065 * 8225280 = bytes Device Boot Start
I. Device Files
Linux follows the Unix style and treats all devices as a file.
There are two types of device files:
Block Device Files (B): such as hard disks and optical drives
Character device file (c): such as serial port, keyboard
Device Files are generally stored in the/dev directory.
Ii. Common block Device Files
/Dev/hd [a-t]: IDE Device
/Dev/sd [a-z]: SCSI devices include SATA devices and USB disks.
/Dev/fd [0-7]: Standard soft drive
/Dev/md [0-31]: soft raid device
Loop [0-15]: Visit th
these specific devices, we need to use the Mount command to hang the external device from the/dev directory. Here you may see there is a win directory, this is my machine above a window to the Windows file system to the point of contact, so I access this directory can access my Windows under the file. But if your Windows file system is in NTFS format, this is not the way to go.
8. / tmp and/ var: these two directories are used to store temporary files and frequently changing files.
of the file is root, the group that belongs to is root, and the file access is drwxr-xr-x. For files and directories, each file and directory has a set of permission flags that are combined with them, in the above example, the contents of the first domain. Here's a closer look at the meanings of each symbol in this field:The field consists of 10 characters, which can be divided into four groups, with the following meanings:D rwx R-x R-xFile type Owner permission Flag Group permission flag other
more difficult to decipher the password, which increases the security of the system./etc/login.defs.:The configuration file for the login command./etc/printcap.:Similar to/etc/termcap, but for printers. syntax is different./etc/profile.,/etc/csh.login,/ETC/CSH.CSHRC:Files that are executed by Bourne or Cshells at logon or startup. This allows the system administrator to establish a global default environment for all users./etc/securetty.:Confirm the security terminal, that is, which terminal al
The following content from: http://www.aikko.com/bbs/viewthread.php? Tid = 13417 extra = page % 3D1
With the popularity of ADSL, people enjoy the speed of broadband, and network security has been paid more and more attention. Have you ever thought that your ADSL account and password are actually exposed on the Internet? Using some tools and techniques, you can easily obtain your account and password to access the Internet, and even purchase products such as QQ coins, lianzhong monthly card, and
problem is resolved. If the problem persists, continue until the fault disappears.Layered Network diagnosis technologyPhysical Layer faults mainly occur when the physical connection mode of the device is correct, the connection cable is correct, and the configurations and operations of devices such as Modem, CSU, and DSU are correct. The best way to determine whether the physical connection of a vro port is intact is to use the show interface command
Broadband routers in China are developing very rapidly. Here we mainly introduce the access to ADSL Modem with routing functions, including the access to ADSL Modem + Broadband Router. At present, ADSL permeate every corner of our lives, whether it is enterprises, Internet cafes, or home users using ADSL to access the Internet, usually, an ADSL line can only support one computer to access the Internet, howe
Small-sized enterprise office networks use ADSL shared Internet access, which is cost-effective. Upgrading ADSL Modem is a highly technical task. If you are not careful, the device may not work properly. Therefore, please think twice before you start!
The general practice is to use the hub with the proxy server software, using a computer as the proxy server, other computers share the Internet through this proxy. Without such Internet sharing, there ha
dial-up Internet access
To facilitate the management and maintenance of the ADSL Modem device during Internet access in the future, many manufacturers often set the "80" port of the ADSL Modem device to its backend Management port, however, if an attacker or hacker knows the default IP address of the ADSL Modem, the administrator password of the ADSL device may
ADSL is a very common broadband access method. However, since one user has only one ADSL account, how can we achieve multi-user sharing of ADSL? Here we will introduce the implementation method. ADSL is an affordable broadband access solution. Currently, it is billed on a monthly basis. if a user uses an account to access the Internet, it will be a bit uneconomical. How can one ADSL user access the Internet? The following are some experiences.
Sharing principle: in view of the current mainstream
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