Networking :: Redhat Lost It's Virtual IP Address?
Nov 1, 2010
had a box lose it's virtual IP address on the eth0 card. I rebooted the box but it just would not give the card the second IP address. We rebooted several times in fact.Today admin ran 'ifup ifcfg-eth0:1' and the virtual IP was there. Nothing was changed, just that command was ran.I thought there might be a problem with the automagical stuff so I rebooted the box again, virtual IP is there and happy.Anyone know why it would not have come back on reboot and why it now does?
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Aug 25, 2009
When I create virtual ethernet interface and do a ping -I <v_int> <host> the outgoing address is the one of the physical interface and NOT the virtual interface.Is there no chance that trafic will go out with virtual interface address??Incoming trafic is done well i.e. responds to the virtual interface have the virtual address.
My problem is that I have 2 modems and want to check both default gw behind the modems.
If I do a "normal" ping both are reachable over default route even the modem which is not the default route will not work because ping goes over the working modem.So I have 2 routing tables and want to route the virtual interface to one modem the other to the other modem
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Feb 21, 2009
I am using Fedora 10 and when I first installed my machine, I had a DHCP assigned address to my network card. Later on I decided that I wanted to give my machine more of a server role, so I switched to static IP using the system-config-network utility. What happened after that was that I did change the IP address and routing information, but DNS information gets lost at every reboot, so I need to type it back again.
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Nov 10, 2010
Is it possible to create virtual network adapter on the same physical network adapter? or How to give or have multiple MAC Address to the same adpater? I m working on centos 5.3.
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Oct 30, 2010
how to do a virtual interface under linux. I'm using for example eth0:1 so ifconfig eth0:1 192.168.0.20 netmask 255.255.255.0 for example.
However if i do eth0:1 hw ether 00:11:22:33:44:55 It changes eth0 as well. Where should i look into for creating a separate virtual interface that's simply bridged with one of the existing interfaces that has a separate ip and hw address that the os handles.
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Apr 6, 2011
I need a small shell based program that prints the mac address of physical ethernet adapter from it's firmware. I need this utility for license generation and appliance activation. I have tried several example but none of them is flawless, The easiest method I have found is to parse the output of "ifconfig" command but it has also some drawbacks.
1. Firstly program should differentiate between physical and virtual adapters. Physical means installed on board(wired or wireless) or installed additionally. Virtual adapters are those created by VPN or created by virtualization apps such as VirtualBox/VMWare etc. I am not interested in virtual ones.
2. In case of more them one physical adapters(wired and wireless), it should print the mac address and description(name & vendor) of both/all adapters.
3. If media is disconnected then also it should be able to read the mac address and description(name, vendor) of card.
4. This one is bit complex. I know that 'ethtool' can show you the universal mac address but it's limited to use only 2 types of drivers and won't work in all cases.
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Nov 18, 2009
I want to translate the virtual address to physical address in linux C application, how to do that?
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Apr 13, 2010
How can I get the physical address corresponding to a virtual address in linux by using /proc file system
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Feb 16, 2010
I've been trying to understand how Linux creates the network/interfaces on a machine (been reading the Linux admin guide), but as I'm pretty new to this subject, I've got lost in the forest.
To provide with my goal:
1.) Learn about network setups on Linux
2.) Be able to maintain my own (virtual) network
3.) Configure my (virtual) network
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Jan 17, 2011
[Code]....
What I want: multiple virtual hosts with ssl and only 1 ip address: In my example: server = 192.168.227.129
[Code]....
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Jan 30, 2011
I have installed virtual Redhat in Redhat using Xen virtualization. The ip of the virtual OS is 192.168.0.3 and of main OS is 192.168.0.2. But even then I apply "ping" command then "Destination unreachable" error occur. How to connect virtual and main Redhat!
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Jun 30, 2010
I am running RedHat 9.0 on a VMware on Window XP, I have bridged the network card eth0 such that
I can ping the host machine 192.168.45.67 and the Windows XP machines on my LAN.
I managed to set up the samba server on this Redhat 9.0, And I can see the netbios name on my WindowXP: Rhl machines. Now I want to reach the Windows machines vi sambaclient but I get an Ip address that is not on my network -192.168.24.1.I did not set this IP address.
This is the message I get when I run smbclient so that I can reach windows machine when I am on Redhat:
# smbclient //machine name/name of user on windows machine
added interface ip=192.168.45.90 bcast=192.168.45.255 nmask=255.255.255.0
Got a positive name query response from 192.168.45.21 (192.168.24.1 192.168.249.1 192.168.45.21
error connecting to 192.168.24.1:139 (Network unreachable)
Error connecting to 192.168.24.1 (Network is unreachable)
Connection to machine name failed
#
My question is Where does 192.168.24.1 IP address come from. Where must I look in order to remove it ( in Linux or Windowx Xp.
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Dec 11, 2010
I have just joined this respective forum and I have a issue with website hosted on Virtual Redhat Server. Scenario is like this I have three virtual redhat server(R1,R2,R3) 5.0 on VMware workstation 7.0 installed on window 7(physical machine), on R1 I have DNS server , On R2 I have Apache web server and I have hosted a website called "geekgadget.com" just for testing purpose, R3 is just a normal server nothing installed on it yet..
Problem : I can access my website [URL] from all of my three virtual redhat server but when I try to access it from some of my physical XP,window 7 machines as well as from virtual XP machine present on my local LAN, website cannot be accessed so I am not getting the point why it happens because I checked that my port 80 is listening.
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Jul 11, 2010
I seem to have lost my Address book in Evolution somehow !! All my addresses have disappeared. Is there some way that I can recover these ?Also how can copy/move/import all my Evolution data over to Thunderbird.
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Jul 2, 2010
What is the (officially) proper way to configure Apache so that a given IP address can have two or more virtual host names, each going to different distinct configurations (e.g. with different DocumentRoot, Alias, etc), and also do this for the IP address so that it goes to a designated configuration rather than defaulting to the first or a random host name?
Apache documentation does not appear to address this. If so, it has it hidden in a non-obvious place.
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Jul 15, 2010
I am interested to know memory layout in linux os.What are the differences between physical address and virtual address?
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Mar 31, 2011
I'm lost I can't get past the 403 forbidden errorI have a directory /home/russ/public_html with a single index.html file
HTML Code:
<html>
<body>
[code]...
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Apr 21, 2010
I have millions of small chunks of new's and delete's in my program. Even though no memory leak is detected through valgrind or purify, memory grows. But the growth is degrading over the number of times of the execution of the tasks. Can i think that fragmentation plays a role in this?
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Feb 21, 2010
A process is trying one access to memory, for example through an array (ex.: vect[0]=123. What happens?
Here below what I guess but I'm not sure and accept any comment (please, distinguish between "the system" and "the CPU" in case).
Let's suppose swapping to disk disbled.
We have two scenarios: without and with cache.
If no cache is present in the system:
1. The CPU must discover the phys addr of vect[0] virtual addr. To do that, has to read from 3 (or 2 depending on the system?) pages tables, stored in memory as well.
2. The CPU writes to the final address.
These mean 4 memory accesses.
If cache is present:
1. Like above but, if the pages tables are in cache, we have 3 accesses to that.
2. If the req. page is not in cache, it's reads from ram and transferred to it. Afterwards, cache is written.
In the best case we have 4 cache accesses.
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Mar 20, 2010
I lost the password for root on a ubuntu virtual machine. Is there any way to restore it or I need to install a new virtual machine with ubuntu again?
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Feb 22, 2011
I am trying to run two web servers (Virtual Hosts) on a single Linux Centos 5.5 box with a single IP address 192.168.0.182. I did all the pre-installation requirements such yum install mysql, yum install mysqladmin, service httpd start, service mysqld start etc etc.In /var/www/html directory, I have two folder called server1 and server2. These two folders have the necessary web server php script files and folders. I opened the browser and managed to install the script on one web server successfully. When I put the IP address 192.168.0.182 on the browser address bar, the page loads without any problem. Now I would like to be able to install the other web server script and I don't know how to?Here is my httpd configuration;
<VirtualHost *>
DocumentRoot /var/www/html/server1
ServerName development.mysite.com
[code]....
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Feb 8, 2010
I have read a couple of articles on how dynamic linking works (those stuff about got, plt and lazy binding), and I am still not sure why you need to do dynamic linking in such a complicated way.Suppose your program uses a function in a shared library that needs to be linked dynamically at run time (like a printf). Why can't you statically decide the virtual address of the function at compile time? After all, all you need to do is to enter the page table entry corresponding to the address of the function if the library has been already loaded to a physical page frame.
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Sep 8, 2010
I setup a virtual server with these configurations:
1. Mail server: POSTFIX / DOVECOT
2. Webmin / Virtualmin
I am getting email to desired folders locally but I am not getting email from outside to desired users. Emails are bounced back with message "Address not found in virtual alias table".
Recent log errors are:
Sep 8 04:25:49 server1 postfix/smtpd[28002]: cannot load Certificate Authority data
Sep 8 04:25:49 server1 postfix/smtpd[28002]: warning: TLS library problem: 28002:error:02001002:system library:fopen:No such file or directory:bss_file.c:122:fopen('/etc/pki/postfix/root.crt','r'):
[code].....
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Feb 24, 2010
Currently my OS is Ubuntu 9.04 Jaunty Jackalope Desktop OS and my web server is Apache2. I have a public address 60.x.y.z and my pc local address is 10.x.y.z. I have a web app in my Apache2 which currently run in localhost(10.x.y.z).
I would like to enable the web app so that it could be browse from outside. I know there maybe some port forwarding process and some commands involved in order to do that. But I have no idea on the steps to do that.
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May 12, 2011
I am working on implementing a protocol on NS2.34 .I really need help to solve this problem . Actually , I don't now whether the problem is generated by the tcl code or the c++ code when I run the simulation, I get this result :
Code:
num_nodes is set 64
INITIALIZE THE LIST xListHead
34
45
channel.cc:sendUp - Calc highestAntennaZ_ and distCST_
highestAntennaZ_ = 1.5, distCST_ = 550.0
SORTING LISTS ...DONE!
code....
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Apr 24, 2010
Consider the following program:
Code:
#include <stdio.h>
#include <stdint.h>
[code]...
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Dec 16, 2010
Version 10.04 LTS. Installed desktop version and network worked but I needed a static IP address and the install configures for a DHCP configured address. I tried changing to static address using the System->Preferences->Network Connections application but was unable to get the system to come up with the network up.
So I manually modified the /etc/network/interfaces and the /etc/resolv.conf files. I restart the system but when I do an ifconfig, I don't see a configured IP address on eth0 (only the loopback address). If I run /sbin/ifup eth0 everything then works fine and ifconfig shows the correct address bound to eth0.
My files are as follows:
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Mar 12, 2011
I'm running Ubuntu 10.10 and I'm having problems trying to assign it a static IP address. No matter what I put in the Preferences->Networking area (identifying the interface as Manual)... it still will query DHCP for an address if I run the dhclient command. I'm using to using ubuntu server where I just set the IP in the interfaces config file.
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May 7, 2010
I am running my own Postfix mail server. Some time ago I noticed that most email was rejected because of the server's dynamic IP address. So I got a fixed IP address. However then I noticed that some mails got rejected due to failing the reverse DNS check. So my ISP told me to get a range of IP addresses and they could then create a PTR record for one of those addresses. That is now running but it turns out that the IP address used for the PTR record is a ... dynamic IP address. So Spamhaus PBL rejects my emails again.
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Nov 4, 2010
As i undertsand - out of 1GB of the virtual Address space for Kernel from 3GB to 4GB of the process address space, Kernel image (code, data, bss, stack, heap) resides staring @0x0 address. Vmalloc area starts either at the end of Physical ram size or at 896M. This 896M cap is mandated to ensure that minimum of 128MB is reserved as vmalloc_reserve for vmalloc,kmap etc.
Is the understanding correct? Now trying to map Physical Zones into this 1GB address space
Initial 16MB is mapped to ZONE_DMA
16MB - 896MB is mapped to ZONE_NORMAL
896MB - 1024MB is mapped to ZONE_HIGHMEM
Does this mean that Kernel image is residing in ZONE_DMA area? Any call to vmalloc() in kernel code will return address beyond 896M? insmod of any LKM will internally invoke vmalloc() to obtain contiguous area - where will this code physically located along with rest of kernel code in ZONE_DMA or in ZONE_HIGHMEM?
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