Question about Red Hat Linux 6.1

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Nfs files if we updates files in nfs server(redhat6.1) , it will reflect after 5 min in clients.(redhat 6.1)

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What are your mount options, particularly on the update side. Try adding sync, it should update immediately but it will cause more load

Posted on May 01, 2014

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Upgrade log: ---------- HWK Update Client v


Authentication stage error: Error: Server returned unrecognized reply
ufs 3

Oct 06, 2013 | Lantronix CoBox-FL-IAP (COBOXFLIAP11)...

Tip

How to Setup Linux Mail Server


<p><span>Email is an important part of any Web site that you create. In a home environment, a free web based email service may be sufficient, but if you are running a business, then a dedicated mail server will be required. <span>A mail server is an application that receives incoming e-mail from local users (people within the same</span><span> </span><span><span>domain)</span> and remote senders and forwards outgoing e-mail for delivery, as example Microsoft</span><span> </span><span><span>Exchange</span>, Gmail,</span><span> </span><span><span>etc.</span></span></span><span> <span> </span></span><span><span>The system uses</span></span><span><span> </span></span><span><span>SMTP </span></span><span><span>(Simple Mail Transfer Protocol) or <span>ESMTP </span>(extended SMTP) for sending e-mail, and either</span></span><span><span> </span></span><span><span>POP3</span></span><span><span> </span></span><span><span>(Post Office Protocol 3) or <span>IMAP</span></span></span><span><span> </span></span><span><span>(Internet Message Access Protocol) for receiving e-mail</span></span><span><span>. </span></span><span><span>In windows forum</span></span><span><span> most of workstations are use Microsoft Exchange server or outlook express. In Linux forum there have also an easiest option to send and receive mail. In Linux configuration of mail server is easy flexible too.</span></span><span></SPAN><br> <p><span><span> </SPAN>In most of Linux workstation RedHat Linux are used for their Server. In RedHat Linux we use sendmail to create a mail server that will relay your mail to a remote user's mailbox or incoming mail to a local mail box. On our RedHat we will find sendmail's configuration file as /etc/sendmail.cf. If you download and compile sendmail you would find it in /etc/mail/sendmail.cf. To configure sendmail you have basically 2 options. Either you edit the sendmail.cf file directly or you create the sendmail.cf from an m4 file such as sendmail.mc. Here to explain the process I will list the steps to produce a custom sendmail.mc file.</SPAN><br> <p><span></SPAN> <br> <p><span><span><b>SendMail Configuration:</b></SPAN></SPAN><span> </SPAN><span><span> </SPAN>In Redhat Linux dovecot and sendmail packages are used as service demon for Mail server. At first I install the available sendmail RPM package by YUM and also the dovecot RPM. After installation first I have edit the sendmail .mc file. After installation of sendmail package it locates as sendmail.mc in /etc/mail. In the sendmail.mc file I have find the line DAEMON_OPTION and edit it with # before the line to uncheck it. Then I find Local Domain and edit it also with the system FQDN. After editing save the sendmail.mc file. After exiting from sendmail.mc I moved this .mc file to sendmail.cf with m4. Here the SendMail configuration is complete. Then I go to the /etc/dovecot.conf file and edit it. I just find the protocol line and uncheck this line. After that I save this .conf file. After all configurations I have start the service demons with chkconfig command and restart the both services. And the mail server was going on swiftly.</SPAN><br> <p><span><span> </SPAN>So it is very easiest job to configure a mail server in RedHat Linux enterprise server.</SPAN>

on Mar 21, 2011 | Computers & Internet

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

1 Answer

Ufs update


Check with your SYSTEM ADMINISTRATOR... for possible PASSWORD LOGIN CHANGE or for admin. configuration(s) changes

Jun 14, 2013 | Computers & Internet

1 Answer

1. My 2008 MacBook Pro rejects most cd's and dvd's, has a Intel 2.5 GHz Intel core 2 processor. 2. When I downloading or streaming movies they keep re-buffering


Solving Problems with Streaming Services

If the Server Does Not Start Up or Quits Unexpectedly:

  • Check the error log.
  • Make sure the QuickTimeStreamingServer file is in the /usr/sbin/ folder.

    You must be logged in to the server computer as Administrator (root) to see the QuickTimeStreamingServer file in the Workspace Manager.
  • Use the Mac OS X Server Setup Assistant to reconfigure the Ethernet ports.
If Media Files Do Not Stream Properly:
  • Check the error log.
  • Make sure the movie file is supported by the QuickTime Streaming Server. Check the list of compatible file formats.
  • Try streaming a sample movie to see if the server can stream it. You can download a sample prehinted movie from the Apple Software Updates Web site: http://www.apple.com/swupdates

    If the server streams the sample movie, the problem you're having may be with the way your movie file is prepared. Recreate the movie.

    If the sample movie doesn't stream, the problem you're having may be with the server computer or the network.
  • Try hinting the movie again with the Optimize Hints For Server option selected.
  • Check streaming server activity and if necessary, reduce the number of connections or throughput.
  • If the problem occurs on a Mac OS client computer, open the TCP/IP control panel on the client computer and make sure MacIP is not selected.
  • If the problem occurs on a client computer, make sure the user has the appropriate settings in the Streaming Proxy and Streaming Transport panels of the QuickTime Settings control panel. The administrator for the client computer's network should be able to provide the correct settings.
  • If the problem occurs for media streamed using PlaylistBroadcaster, try hinting the movies again with the RTP Payload Encoding set to QuickTime and Smooth Data Rate enabled.
  • If you are reflecting more than one live stream, make sure each stream uses a separate UDP port. Otherwise client computers will show a message with error 500. You set up ports in the relay configuration file.

If Streaming Service is Slow:
  • If you are streaming QuickTime movies, make the movies self-contained using your authoring application, and make sure hinting is optimized for streaming services.
  • Reduce the maximum number of connections or the throughput.
  • Turn off other services.
  • Place media files on other hard disks to improve server performance.

    Because QuickTime Streaming Server can use only one media folder, you need to create links from the folder you have selected in QuickTime Streaming Admin to the media files on other hard disks. To do so:

    In the Workspace Manager, press the Control key and drag the folders that contain the media from the other disks to the folder you have selected as the media folder.

Aug 04, 2011 | Computers & Internet

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)...

6 Answers

Upgrade log: ---------- HWK Update Client v 2.1.0.0 ---------- ---------- HWK upgrade started:6/11/2011 7:02:40 AM ---------- -- Target Id : 62 CF 1 10 -- UFSx Boot : UFxBoot V2.2 (c) SarasSoft...


Upgrade log:
---------- HWK Update Client v 2.2.0.0 ----------
---------- HWK upgrade started:8/1/2013 6:34:25 PM ----------
-- Target Id : 62 CF 1 10
-- UFSx Boot : UFxBoot V2.2 (c) SarasSoft 2003.
-- UFSx Firmw.: UFS_USB V2.8 (c) SarasSoft 2007.
-- UFSx S/N : 56512
-- Features : 00000001
-- Licence 5 : True
-- UFSx Vendor: TORNADO
-- HWK ID : A1.04-PRO1-DA0064A542600069
-- HWK Status : 1, DL: 0
----------
Locating HWK Upgrade server...
HWK Upgrade server found!
Preparing connection to server...
Connecting to HWKUpgrade server...
Server connection successfully established.
Authenticating on server...
Authentication stage error: Error: Server returned unrecognized reply

Jun 11, 2011 | Lantronix CoBox-FL-IAP (COBOXFLIAP11)...

6 Answers

How to download hwk update client v 2.1.0


Upgrade log:
---------- HWK Update Client v 2.1.0.0 ----------
---------- HWK upgrade started:6/2/2011 6:35:55 AM ----------
-- Target Id : 62 CF 1 10
-- UFSx Boot : UFxBoot V2.2 (c) SarasSoft 2003.
-- UFSx Firmw.: UFS_USB V2.8 (c) SarasSoft 2007.
-- UFSx S/N : 78650
-- Features : 00000001
-- Licence 5 : True
-- UFSx Vendor: TORNADO
-- HWK ID : A1.04-PRO1-DE6985914260006D
-- HWK Status : 1, DL: 0
----------
Locating HWK Upgrade server...
HWK Upgrade server found!
Preparing connection to server...
Connecting to HWKUpgrade server...
Server connection successfully established.
Authenticating on server...
Authentication stage error: Error: Server returned unrecognized reply

Oct 07, 2010 | Lantronix CoBox-FL-IAP (COBOXFLIAP11)...

2 Answers

Compaq PE2160 with LINUX OS


Check to make sure all of your paths in the mount command are right. I had this issue a week ago and after putzing with it for a few days I noticed I was trying to mount a non-existent share. Fixed my ***** command and it worked right away. Other things to look at: Check your /etc/exports on the server and make sure the shares are in there. Also make sure that they are active by restarting nfs (/etc/init.d/nfsd restart (may be different now, that worked years ago)). Last, double check your mount command on the client. Make sure the share exists and the server is pingable. If this doesn't help, you may want to try searching on some linux specific forums. linuxquestions.org is good, or if you have ubuntu, ubuntuforums.com.

May 26, 2008 | Compaq Presario Desktop with Intel Pentium...

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