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What is a gateway?,what is a file server?,what is system opertor?

What is the difference between RAMand ROM ? What is UPS and it's uses?

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Goto http://www.wikipedia.com/ and express your doubts. This will helps you alot..

Posted on Mar 10, 2009

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Dear experts; We have a HP R3000xr UPS, inetend to install the power management software on a server runs windows server 2008 R2 OS. Installed the power manager server software, the following messages...


Is the cable USB or SERIAL?
make sure serial port IRQ is enabled in BIOS
ALso make sure you are using x64 and not x32 drivers for UPS
ALso try getting a USB cable to connect to your UPS device

Feb 17, 2011 | HP R3000 UPS System

Tip

DHCP Server configuration in Linux


Linux is a UNIX based operating system. It is a server operating system. REDHAT Linux is Enterprise version of Linux. Now a day's Most of corporate sectors use red hat Linux as server in their company because it is secure very much.

Full form of DHCP "Dynamic Host Configuration Protocol. DHCP server assigns IP addresses and other network configuration information like subnet mask, broadcast address, etc to computers on a network. The DHCP assignments are the following.

Lease Request: Client broadcasts their request to DHCP server with a source address of 0.0.0.0 and a destination address of 255.255.255.255.
IP lease offer: DHCP server replies with an IP address, subnet mask, network gateway, name of the domain, name servers, duration of the lease and the IP address of the DHCP server.

Lease Selection: Client receives offer and broadcasts to al DHCP servers that will accept given offer so that other DHCP server need not make an offer.

The DHCP server then sends an ack to the client. The client is configured to use TCP/IP. Lease Renewal: When half of the lease time has expired, the client will issue a new request to the DHCP server.

Installation of DHCP server: First of all while install the RedHat Linux enterprise version server be careful about the ports and the services must be turned on. To create DHCP server in Linux first download DHCP RPM package and install with "rpm-ivh" command. Where I have done it there I have create YUM server, so easily I have download and install it by YUM (yum install dhcp version). DHCP package will locate in /usr/share/doc/at Linux file system. I copied the DHCP's files from /usr/share/doc/ to /etc/dhcpd.conf.. Then I started to configure the dhcpd.conf file to route the DHCP server in there local network. I have open the configuration file with "vi" command. Then commented out the lines from "default gateway to option netbios" because system don't read the commented lines. After that I set the range of IP address in dynamic- bootp of their local assumption of system. I have change the "next-server" with the dhcp server name and have also change the fixed address with the dhcp server IP address (end range of dynamic IP). It is very easy job to configure DHCP server. After configure the .conf file of dhcp just turn on the service with "chkconfig" command and restart the dhcp service. After that entire job I reboot the system. And after rebooting of server I turned on the other client system. While startup the client system without static IP address all of those picked up IP from dhcp server and going on successfully. I have prefer the command line mode to do the total job.
The DHCP server configure file is following:

ddns-update-style interim
ignore client-updates

subnet 192.168.1.0 netmask 255.255.255.0 {
# The range of IP addresses the server
# will issue to DHCP enabled PC clients
# booting up on the network

range 192.168.1.201 192.168.1.220;
# Set the amount of time in seconds that
# a client may keep the IP address

default-lease-time 86400;
max-lease-time 86400;

# Set the default gateway to be used by
# the PC clients

option routers 192.168.1.1;
# Don't forward DHCP requests from this
# NIC interface to any other NIC
# interfaces

option ip-forwarding off;

# Set the broadcast address and subnet mask
# to be used by the DHCP clients

option broadcast-address 192.168.1.255;
option subnet-mask 255.255.255.0;

# Set the NTP server to be used by the
# DHCP clients

option ntp-servers 192.168.1.100;

# Set the DNS server to be used by the
# DHCP clients

option domain-name-servers 192.168.1.100;

# If you specify a WINS server for your Windows clients,
# you need to include the following option in the dhcpd.conf file:

option netbios-name-servers 192.168.1.100;

# You can also assign specific IP addresses based on the clients'
# ethernet MAC address as follows (Host's name is "laser-printer":

host laser-printer {
hardware ethernet 08:00:2b:4c:59:23;
fixed-address 192.168.1.222;
}
}
#
# List an unused interface here
#
subnet 192.168.2.0 netmask 255.255.255.0 {
}

on Mar 17, 2011 | Computers & Internet

Tip

Firewall Software Types


Viruses, worms, bacteria, rabbits, etc. are the different types of unwanted programs that infect computers and cause obstruction in normal operation. To avoid this and to protect your computer against infection and to ensure proper operation, install good antivirus software to detect viruses and remove or repair the damaged files virus. Software acts as a gateway firewall; the firewall is four different types. The gateway packet filtering, circuit gateway and proxy server level.The firewall is the firewall packet filters most basic. Packet filtering firewall filters incoming and outgoing packets of the machine based on user configuration. For example, the package contains information on the package. So if the user has blocked a port number or IP address of all packets from that port number or IP address will be removed. A firewall in the safety circuit when recording with TCP or UDP protocol is established between the host and network. At the level of the application firewall works at the application level. A proxy server is a type of relay server.The proxy server forwards this request to a server which in turn looks for the IP address and sends the appropriate proxy server. A proxy acts as a firewall between the machine and the network. You can adjust the proxy settings for their own purposes. And 'one of the most powerful desktop security mechanisms available for security. In addition, the firewall provides the security system can also be used to guide the installation of backup software. For a LAN or network packet's internal filter can be ideal. external networks, application gateways and proxy servers are a must. Prevents unwanted packets of data and content. So if safety is a concern not forget to install the latest firewall software keeps your computer from viruses and fully functional.

on Feb 08, 2011 | Computers & Internet

3 Answers

What to do for support now that MPC went out of business


As owners of multiple MPC and Gateway systems, we are currently mirroring the entire MPC support site and will have ALL files necessary for updating any MPC and MPC/Gateway systems. All owners manuals, device drivers, setup files, etc. will be available in the very near future. This is an ongoing procedure and is taking up over 100 gigabytes of storage space and a great deal of strain on our servers.
All files from the former MPC support site will be on our server as of 3/26/09.
We are still unsure of which of our websites will be hosting the downloads but will email all those interested when the site is up and running.
Obviously, this is an enormous undertaking to construct a site of this magnitude so please allow us time to get it up and running.
For the time being, we can process a limited number of requests for drivers, manuals, etc through our email system. You can contact us with a serial number and we will email back with all of the files we have available for your particular pc.
Contact available through the following email address. xodusss@cox.net

Jan 15, 2009 | Gateway 920 Series (gtwy920) Server

Tip

Set up a home office LAN which access internet through USB wireless gadget


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.

Linux Configuration:

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.

on Jan 12, 2011 | Network Computing Devices (NSH800S/A)...

Tip

FAIL-SAFE FILE SERVER AND COMPUTER SYSTEMS If your data is very important, you...


FAIL-SAFE FILE SERVER AND COMPUTER SYSTEMS

If your data is very important, you should consider doing regular data backups because hard disk will fail at some at some stage in the future. This is especially true when you get an error message"hard drive is about to fail".

Depending upon how critical your computer or files server to you or your business, you should consider building a fail-safe computer or file server system using RAID technology. RAID means "A Redundant Array of Inexpensive Disks" and there are several levels of RAID.

For details of different RAID levels - click on this link -
http://searchstorage.techtarget.com/sDefinition/0,,sid5_gci214332,00.html

The most common of the fault redundant RAID systems are -

RAID 0 + RAID 1 provides fastest data transfer Mirrored hard drives.

RAID 5 is one of the most popular system, it data striping across hard drives with error correction. It has excellent performance with fail-safe system and allows for hot swappable hard drives.

There should be redundant powers supply inside the computer or file server in the event of a power supply failing.
Another consideration is to install a UPS (uninterruptible power supply) to prevent a computer or server shut down from power outages, as this will corrupt your data.

These systems do not mean you should not back up your data on a regular basis.

on Oct 20, 2010 | Computers & Internet

2 Answers

I cannot use utoorent to download


By using the proxy gateway you havce not cracked the forti guard, you just found a loophole, that is different from cracking or hacking the system.

You can use freely the Internet and bypass proxyguard by using freegate proxy, but you wont be able to use a torrent fileshare , as this needs opening a port directly on the server, and you do not have access to server.

I have done daministration on a system protected By Bess system, and I can assure you there is noway to access to the gateway and change permissions if you are not an administrator.

Dec 12, 2008 | Fortinet, Inc. FortiGate 3000 (fg-3000-us)...

1 Answer

The server shutdown approxmatly every day


if the log says that the shutdown was unexpected, then I'd suspect a power outage at that time. If you're using a managed PDU, check to see if that outlet (or the whole pdu) is set to power cycle. If you have more then one power supply, I'd recommend plugging them into different pdu circuits. If you're pluged in to a UPS, suspect that the UPS is cycling and that there's no UPS management service running. If you're plugged into (yikes) the wall, suspect building power.

Mar 25, 2008 | Dell PowerEdge 1800 Server

1 Answer

File transfer:old computer to new


If your UPS has both a Serial and USB port uallly only one may be used - since this is generally ment to go to a server to signal a shut down is required to the operating system. if you have both PC's on the LAN use one as the "server" since the UPS utility will allow you to send commands to shut down other PC's that are sharing your UPS on your LAN.

Dec 11, 2007 | Belkin (F6C800-UNV-PL) UPS System

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