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How To Setup Networking For KVM Guests

I have a server with CentOS 5.4 with 5 IPs. Now i want to spare 1 IP for the host, and create 4 virtual machines, each with 1 dedicated IP and has direct access to internet (virtual machines created with KVM come with NAT as default)

Anyone can point me to a tutorial or tell me how to setup networking for this ? Working over GUI is not possible since i only have ssh access and don't want to install X just to install things. Is it possible to use Xen networking scripts for KVM guests ? I have tested Xen on my server and its default networking setting worked ie with guests have direct connection to internet.

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Kernel Version: 2.6.9-22.ELsmp
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procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
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0 0 160 17132 6580 1930160 0 0 0 7 1020 589 0 1 99 0
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With this server I got 7 IPs.

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I just got a new server set up CL-T113-140CL. It was
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this is the reply I get back from their system adminstrator

The gateway to be used for your secondary IP addresses is the same as
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Jean-Francois Doucet [iWeb]
System Administrator / Administrateur Système
Support / Client Hub : [url]

Are they brain dead at iWEB? DO they understand basic TCP-IP networking at all?

Here is my last reply. I tried to make it real simple for them to understand.

This does not address the issues. Do you even know what a virtual
machine is? It is a virtual computer running on the host computer.
The host computer has a valid ip address of 70.xx.15.171, sm: gw: 70.xx.15.161. The virtual machines (or guest
operating systems) if I assign it the IP address of 70.xx.18.249 SM: with no gateway it is physically impossible for it to
reach the gateway of the host pc 70.xx.15.161. You have to understand
the Virtual Machine operates as a completely separate computer. It
requires its own gateway. with no gateway specified it has no way to
get out of its local subnet to get to the 70.xx.15.x subnet. What
happens if you put two physical computers on one hub. The computer on
port 1 of the hub has the IP info 70.xx.15.171 SM: GW
70.xx.15.161. The second computer is on port 2. It has the ip info
of: 70.xx.18.249 SM: GW: NONE.
How is the pc on port 2 going to communicate with the pc on port
1? This is the exact situation we are in. There has to be a
gateway to route the IP traffic from pc2 to pc1 to get onto the

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# up the log file. These ports are specifically blocked (applied to TCP and UDP
# protocols) for incoming connections
DROP_NOLOG = "67,68,111,113,135:139,445,513,520,1026,1027,1234,1433,1434,1524,3127"

# Enable packet filtering for unwanted or illegal packets

# Log packets dropped by the packet filtering option PACKET_FILTER. This will
# show packet drops that iptables has deemed INVALID (i.e. there is no
# established TCP connection in the state table), or if the TCP flags in the
# packet are out of sequence in the protocol exchange.
# If you see packets being dropped that you would rather allow then disable the
# PACKET_FILTER option above by setting it to "0"

# Enable verbose output of iptables commands

# If you wish to allow access from dynamic DNS records (for example if your IP
# address changes whenever you connect to the internet but you have a dedicated
# dynamic DNS record from the likes of then you can list the FQDN
# records in csf.dyndns and then set the following to the number of seconds to
# poll for a change in the IP address. If the IP address has changed iptables
# will be updated.
# A setting of 600 would check for IP updates every 10 minutes. Set the value
# to 0 to disable the feature
DYNDNS = "0"

# If you wish to allow access from all IP's that have authenticated using POP
# before SMTP (i.e. are valid clients) then you can whitelist them using this
# option which checks for IP addresses in /etc/relayhosts which last for 30
# minutes in that file after a successful POP authentication
# A setting of 60 would update IP's every 1 minute. Set the value
# to 0 to disable the feature

# Enable this option if you want to allow incoming connections from reserved
# ports. Normally, only DNS connections have the same SRC and DST port (53)
# and any other connections should have a SRC port > 1023. On *nix systems this
# rule is generally adhered to and reserved ports are not allocated as SRC
# ports. However, other notable OS's appear to ignore this and allocate them at
# will. This means it's possible that users may come in on reserved ports, so
# enable this option if you want to allow them to, or disable it if you want to
# be strict

# Limit the number of IP's kept in the /etc/csf/csf.deny file. This can be
# important as a large number of IP addresses create a large number of iptables
# rules (4 times the number of IP's) which can cause problems on some systems
# where either the the number of iptables entries has been limited (esp VPS's)
# or where resources are limited. This can result in slow network performance,
# or, in the case of iptables entry limits, can prevent your server from
# booting as not all the required iptables chain settings will be correctly
# configured. The value set here is the maximum number of IPs/CIDRs allowed
# if the limit is reached, the entries will be rotated so that the oldest
# entries (i.e. the ones at the top) will be removed and the latest is added.
# The limit is only checked when using csf -d (which is what lfd also uses)
# Set to 0 to disable limiting

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DNS Setup For VPS
initial WHM DNS setup i tryed at first with whm but it seems like it messes the nameservers IPs so i just put some entries manually I got all name servers IPs and shared IP setup right but i may be have some problems with DNS zones
here is my named config

view "internal"
/* This view will contain zones you want to serve only to "internal" clients
that connect via your directly attached LAN interfaces - "localnets" .
match-clients { localnets; };
match-destinations { localnets; };
recursion yes;

zone "." IN {
type hint;
file "/var/named/";

// include "/var/named/named.rfc1912.zones";
// you should not serve your rfc1912 names to non-localhost clients.

// These are your "authoritative" internal zones, and would probably
// also be included in the "localhost_resolver" view above :

zone "" {
type master;
file "/var/named/";

zone "" {
type master;
file "/var/named/";

zone "" {
type master;
file "/var/named/";

zone "" {
type master;
file "/var/named/";

view "external"
/* This view will contain zones you want to serve only to "external" clients
* that have addresses that are not on your directly attached LAN interface subnets:
match-clients { !localnets; !localhost; };
match-destinations { !localnets; !localhost; };

recursion no;
// you'd probably want to deny recursion to external clients, so you don't
// end up providing free DNS service to all takers

// all views must contain the root hints zone:
zone "." IN {
type hint;
file "/var/named/";

// These are your "authoritative" external zones, and would probably
// contain entries for just your web and mail servers:

// BEGIN external zone entries

zone "" {
type master;
file "/var/named/";

zone "" {
type master;
file "/var/named/";

-------------------------------------------------------------------------- is my hostname
I still can't ping or but my name servers are ok
what exactly the problem?

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DNS Setup
All the domains on my server are using my own hosted nameservers, but now I have a new domain where I need to use a 3rd party DNS (

The settings on wasn't a big deal, but what on my own server?

I created the domain through whm and it is set to use my own DNS just like the other domains. How do I change it to use the DNS from

This is how my zonefile looks like:


; Zone file for
$TTL 14400
@ 86400 IN SOA (
2007050801 ; serial, todays date+todays
86400 ; refresh, seconds
7200 ; retry, seconds
3600000 ; expire, seconds
86400 ) ; minimum, seconds 86400 IN NS 86400 IN NS IN A IN A IN MX 0

ftp IN A

I guess I don't need the A record and Cname here since I set that up at

How should it look and are there anything else I need to change on my server?

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DNS Setup
i 've tried to setup dns server. i configured dns as well. but it's not reachable by the domain. would you help me to setup this dns settings correctly. will my nameservers would be and if i set it up in windows server 2003?
i can't login through ftp programs. even when i type my login details. how to change the permission on the server.

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Setup DNS
Does anyone know of a tutorial that can teach me to setup a dns on my windows server for apache so instead of using an ip address i can use a domain and it would go to my website.

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Php Setup
I am trying to run my first PHP 5 application that I bought from SitePoint called "Using Ajax with your web applications" but am having lots of problems trying to configure it to run on Windows XP and IIS.

I have installed Apache2.2 and PHP php-5.2.3-win32-installer.msi

I have made some changes and the last error message I got yesterday was this:

No input file specified.

I have tried to set the doc_root path in the .ini file to C:inetpub/wwwroot/finance/www and also delete it as I saw in some forums but to no avail.

I have set my IIS alias to the "www" folder since it contains the index.php file. It also contains another file I do not know what it is used for (.htaccess) and I left it alone.


Today, when I tried to open the file again in IE,


I got the following error:

Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.

I would appreciate very much if someone could help me to sort this problem out. What do I have to do to get the server back and running and get it to work with this PHP application?

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IIS 7 Setup And Use
I am having some trouble correctly setting up IIS 7 on Vista Business.

I have used the standard resources and web casts from Microsoft to get IIS set up to run asp/ applications. When I run them from the localhost they run perfectly and everything seems to be fine. What I am having trouble with is editing and updating websites based in the inetpub>wwwroot folder.

I keep getting security messages and am unable to save edited file directly from studio.

Is there a plain English (yes I am new to server management) tutorial to getting IIS 7 to work fully so that I can develop ASP.NET applications at home.

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There are a lot of tense people here lately..and I'll withhold the name the guilty party in this until I see when my next billing date is..should be interesting indeed. It is clear some of you need a good laugh.

Silly me..I was always under the impression when a "VPS has been setup" message via was actually setup. Nope.

Actually..the vps is *NOT* setup. I have to wait another 24-48 hours for it to actually work. Mind you..I'm not talking about DNS at all..the fact remains..I have a setup email..and it ain't setup at all. No placeholder page via power remote desktop..all tried with a raw ip address. The DNS has been setup, though. I'm going to keep a close eye on these folks for further fun. experience has been deplorable with people that play games like this on day one. In fact..I've never had day 30 with any of them.

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SSL Setup
I have a dedicated server, Windows Box using IIS and Plesk.

I purchased an SSL from comodo and have installed the cert without any problems.

I have read the many plesk tutorials without any success.


[url]works as it should

[url] automatically re-directs the the browser and displays the index page found in the /httpdocs/ folder

[url] not found even though the file is there and in the /httpsdocs/ folder, however the SSL is working and is indeed my SSL that I purchased.

It would appear to me that for some reason the /httpsdocs/ folder is not accessible and if no specific file is requested it re directs to the /httpdocs/index.html file and thus breaking the SSL.

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DNS Setup
I have just finished setting up another dedicated server of mine and this one is located in a different data center than the others, after i set it up i received this message from c-Panel to my root e-mail address:

The hostname ( resolves to
It should resolve to Please be sure to correct /etc/hosts as well as the 'A' entry in zone file for the domain. Some are all of these problems can be caused by /etc/resolv.conf being setup incorrectly. Please check this file if you believe everything else is correct. You may be able to automaticly correct this problem by using the ' Add an A entry for your hostname ' under ' Dns Functions ' in your Web Host Manager is where the server is located in the data center. i wish to have my own nameservers and on the same server, i want my nameservers to be and how can this be fixed? any one that can help me resolve this problem there will be a remote backup offer to claim from us

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New Setup
I've been using reseller accounts for a while but a major customer has decided their needs have grown to the point they want the server to be local for faster access and other things. Since they have been quite happy with my services so far, they want to let me carry on for them even though I've admitted to them I've never done the things they want before.

So now I need to setup the Linux servers in a local datacenter and would appreciate some real ground advise on certain things.

1. Redundancy if the server fails
So far my research indicates that this is known as a failover arrangement. It seems that the software to use are Heartbeat which monitors if the primary server's alive and DBRD which synchronizes changes to the drive data. Am I correct or missing something crucial in the middle somewhere?

2. Backup Website
If for some reason the server is totally inaccessible, such as network failure, is there a way for visitors to be redirected to a site hosted on my current reseller account informing them that the site is currently unavailable and giving some basic contact information?

3. Bandwidth control
The server is provided with a 5mbps connection. My client runs several web applications and would like to ensure speeds on certain applications for some customers.

I understand it's possible to set up domains like www-client_normal_customers-com, www-client_premium_customers-com, www-client_staff_updaters-com using 3 different IP pointing to the same server. (using dashes because wht won't let me post urls...)

Then is it possible to set things in such a way that premium IP and staff IP will always at least have 1mbps of bandwidth to use.

E.g. 20 normal customers banging away at the server using the full 5mbps.
2 premium customers connects, the rest are automatically cap to 4mbps, giving the premium customers 1mbps to share.

Then a staff logs in to update the database, normal customers get cap to 3mbps giving the staff 1 mbps to use and not affecting the premium customers.

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DNS Setup With 2 Different IP Addresses
i have two different ip addresses from two hosting providers free and bind in running both of them. will i be able to setup ns1 and ns2 with those IPs for my new domain.

will it work?

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WSUS Setup
I want to setup WSUS for automatic updates for our servers. Can I setup WSUS on a VPS created in Virtuozzo? What should be the ideal server configuration for the WSUS. Also, I want to know if I can update any server using the WSUS server or the servers should be in the same network.

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RAID Setup
We have a client that has a mail server with two drives. One hard disk is devoted for OS/Application (C and one is devoted for mail storage only (D

The goal is to make the D: drive which is a SATA 320GB drive to be made into a mirror, i.e. add another drive and a RAID Card and make D has a RAID Mirror drive.

My understanding is that when a RAID is configured for drives, the drive will lose whatever data it has on it ? Is there no other way to construct a singular environment into a RAID mirror environment (by adding a drive and Card) without losing drive on one of the primary drives?

Is this possible or am I SOL?

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NY NOC Setup Times
I have just come here to see if anyone else has experienced long setup times with the NY NOC?

It has been 4.5 days now and still no welcome email.

I emailed sales asking for an ETA and they just said due to the public holiday your server will be setup tomorrow (that was 2 days ago)

I emailed sales again and got no reply. NOCANDY replied on here saying yes things got delayed your server will be up shortly. (that was yesterday)

I have asked for a full refund lets see what happens

I recently took the AMD opteron special they had going for $69/m which i thought was pretty good but i wont even get to try it

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Lxadmin Setup
I saw a vps plan without any control panel.

Virtuozzo based VPS comes with no control panel. I am wondering if it is easy to install Lxadmin or not? and is it all the same as lxadmin preinstalled by providers for operating?

I used a vps for several months with lxadmin, can deal with lxadmin well. so still want to have it.

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How Many Amps Will This Setup Take
I've got a 1U case and i was wondering what i could fit in there to get the most out of it. I'm looking at colocation and i'm allowed 0.4amps.

Will i be able to run a

2 x quad core xeon
4x2GB FB-DIMMs or 8x1GB FB-DIMMs

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Web Server Setup VPS
I've registered a new domain name and 'hired' a Virtual Private Server (not managed) to host it. I know 'some things' in php and web design but I'm newbie with configuring servers (especially remotely on a Linux server.... )...

This is what I've done so far :

1. registered domain name at and set up DNS there (my VPS server names)

2. I've installed Linux Ubuntu 8.04 on my VPS

3. I've downloaded and installed XAMPP 1.7.1 on my VPS

I've registered my domain name yesterday and it is still 'invisible' when I type in the address... BUT when I type in my VPS's IP address, the XAMPP welcome screen appears (MySql isn't running though...).

I know this is a child's play for a Linux expert, please if someone knows a good tutorial, step-by-step guide on how do I set up everything to work properly....

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Gigenet Setup
We have servers in many DC's FDC, Singlehop, DedicatedNOW, ThePlanet, but no one set up our servers faster than Gigenet. I placed the order and 2 hours later I get my server login details and all the plugins I needed were also installed. I also read on their website that 95% of the servers get deployed within 2 hours which is great! I have contacted support 2 times and they replied quickly and they did exactly what I asked for. So far so good and will update everyone in a couple of months on how everything goes.

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VPS Instant Setup
which provider does instant setup of vps, basic linux, with decent limits like at least a 128MB memory 200gb bandwidth like $10 around

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