Question about Computers & Internet
I am facing network connectivity problem with few of the pc's in my office wherein it can ping one system and cannot ping the other. I ensured whether problem with the switch / lan cable through cable tester the connectivity is fine . All the pc's fall under the same work group...This problem keeps killing me..
suggestions at the earliest are most welcomed...
Thanks in advance
Most likely issue is no common server on the network to specify which computer has what IP address and associate that with a name. Bob's computer gets a different IP address each time he turns it on, and the same happens with Sally. But Joe's always seems to get the same IP, so everybody can always find Joe. Specifying static IP addresses on all computers is a beginning to solving this, then I would edit the hosts file on each computer to specify that Bob is at IP x.x.x.x, and Sally is x.x.x.x, and Joe is x.x.x.x, copy this hosts file to all computers, and edit it when new computers are added. Another solution would be to get a Windows Server that is doing both the DHCP (Assigning Addresses) and DNS (A computer program running on a server, translating names into IP addresses), all computers will ask the DNS server where Bob is, and get a response from an internal server that says bob is x.x.x.x
The issue you are having is the number one reason to get away from a peer-to-peer network.
Posted on Mar 19, 2008
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Posted on Jan 02, 2017
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Network administration is a serious job. This is especially true for companies that rely on computers to input, process and share data. The more computers or nodes in the network, the harder it gets to manage them. Fortunately, there are several tools can greatly simplify your job. They are called network monitoring tools. Many of them are open-source programs, and they are ready for download and installation.
Don't mistake these programs as simple tools for just monitoring if a device is turned on or off. They are full-pledged remote access programs that allow an administrator to view all devices that are connected to the network (routers, modems, servers, printers etc.) and all the processes being run in each node. If you are a network administrator, you'll need specific programs for different jobs.
Network Monitoring Utilities
Network Ping and Softperfect Network Scanner are the tools for the job. Network Ping gives you a visual overview of all the computers connected to your network. It checks the network status by sending each device a ping. If the device is down an email alert can be sent to an administrator.
Softperfect Network Scanner or NetScan is popular lightweight software that detects all devices attached to your router or access point. It pings all possible IP addresses to determine which computers are currently being used. It is also integrated into the Windows Explorer, allowing you to view all shared files and folders through the NetScan interface.
Intrusion Prevention System (IPS)
The most popular IPS worldwide is Snort. In real time, it analyzes packet capturing and network traffic on IP networks. With its analysis of protocols, Snort can identify network attacks and attempts to perform unauthorized actions such as fingerprinting, buffer overflows and port scanning. With this software running, you are guaranteed that your office network is safe from intrusions. Snort can record packets and generate human-readable reports.
Remote PC and Server Management
Putty and the "Dude" are network monitoring programs for the Windows platform. They track all devices in your network and they can generate a network map or inventory depending on the nodes currently online. Putty, in particular, is very light at 450 kb because of its UNIX-based interface. It allows you to set administrator privileges in remotely controlling computers. Putty can also manage bandwidth allocation or block IPs from using DSL internet.
Having the right network monitoring tools for the job helps network administrators automate many of the day to day operations that take up time and resources to complete.
Nov 16, 2011 | Sony Computers & Internet
The following networking job I have done in this Lab. It is enough for a small office to access or transfer file Printing and access of shared Internet in different type of operating system.
We have recently set up a home office (small laboratory) LAN. All the computers access the internet through a USB wireless (CMDA) dongle. The USB stick is Huawei EC168C and internet service provider is Reliance Infocom (India). But any USB internet dongle can be use to share internet in a LAN in the following way. And you don't need a router for that. In the areas where ISP cannot give wire line internet connection this type of USB wireless sticks are really helpful for home office.
Basic LAN Connection:
Here this lab has 4 PCs. One Windows XP, another Windows Vista starter and two RedHat Linux server systems. Here in this lab I have done the basic LAN connection using cat5 cable & RJ45 connector and an 8 port hub. I have connect the two windows based OS. Using cross cable I have connected two windows system with the hub. Then I put static IP address in Ipv4 of TCP/IP. After that I set workgroup name to join in a workgroup in windows PCs. Then I tried to ping the systems, and it was pinging. Then I have setup a home or small office network in both windows system. That I have enabled the Printer sharing. After that I can share file, data and printer through the system gateway.
Now I have to connect other two Linux PCs in this network. With same cross cable I have joined the both Linux system with the hub. Then to detect the Ethernet device I have put down "DEVICE=eth0" entry in /etc/sysconfig/network-scripts/ifcfg-eth0 file. Then I set IP address in Ethernet device in network configuration in graphical mode (or System-config-network in text mode).After doing this job I restart the network service with "service network restart" command. Then I am trying to ping the systems to one another, And It was pinging.
Now Linux system can access with each other and files also shared through SSH, Telnet,FTP using process and command.
I have configured the Linux system in the following way. First I have set the host name in /etc/sysconfig/network file by VI editor. Next I have edit /etc/sysconfig/network-scripts/ifcfg-eth0 file with "Device=eth0" to detect the Ethernet device. After that I have put the IP add in network configuration file and Restart the network service. To keep the eth0 on permanently I also use the chkconfig command.
After doing this job File sharing can be possible through network file sharing (Nfs). I have install Nfs package & shared the nfs dir by editing exports file. Then I am trying to automount the NFS dir by automounting process. So that I put automounting entry of nfs file in fstab file. After that it's automounted in other system's mount location.
Windows & Linux Networking:
Through basic LAN both OS can only ping each other. To share file or data samba server (a client server in Linux) must be configured in Linux system. So I Install smb rpm package from yum repository. Then I have Configure the samba/smb.conf file. I put the Workgroup name on Workgroup column of samba/smb.conf file. Then I Set the network IP without host to route in network in Host allow column. At last I put down all details of Samba dir, users at the end of the configuration file set the samba password. After that I restart the samba demon to up the samba server. Now files can shared through samba server. In windows I Set the workgroup name pairs with samba server and also set username and password same as samba server. Now I trying to send or access file through samba in both OS and it happened.
USB Net Connect:
Here in this lab workers are use internet from an Usb net connect. So it must be shared in Network. It is too fast so shared internet can be access easily. In Windows XP system I connect the USB netconnect & share it in network. IF all the network setting is ok then all the systems can access shared internet through gateway. Here all users use this shared internet now.
Access of Another System:
VNC Server & Viewer is software through which we can access of another system easily. I just install the software & set the password. Then I run the vnc server. After that I Put the IP add of vncserver from vncviewer of another system and type the password & start access the vnc server system. It can be access form WAN also. I just Run the Vnc server and connect the internet and I got a Wan IP add provided by ISP.
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