Networking :: Hosts Not Able To Resolve IP Address?

May 28, 2010

I have to build a netwrok for small lab and office setup.Setup as belowI have a PC running with Centos 5.4 and has 4 NIC cards. eth0, eth1, eth2 and eth3

View 3 Replies


Networking :: ARP Does Not Resolve MAC Address Of Hosts On The Same Subnet?

Jul 26, 2011

I just changed my CentOS server from DHCP to static IP address. After the change, I cannot ping other hosts on the same subnet. (I can ping the CentOS itself).The IP address of CentOS is pinging (106 is on and other host can ping it), arp -a shows? ( at <incomplete> on eth0 It looks ARP cannot resolve MAC address of hosts

View 1 Replies View Related

Ubuntu Networking :: Resolve Hosts By Name On SOHO

Aug 24, 2010

I bought a network printer, gave it a host name, address should be assigned by my cable or DSL router. Thats what DHCP and DNS is made for right?Now I will print to that printer from my (Lucid) Kubuntu box and resolve it by it's hostname.I can't ping it by printername, I can't ping it by printername.local.It works when I login my router, read out the IP address and hostname the printer registered at the routers DHCP-table and use that address.What can be done that a router transfers the hostnames it has in it's IP-table to clients upon DHCP resolve AND whenever a client get's a new IP-Address?

View 9 Replies View Related

Ubuntu Networking :: Wireless Connects But Cannot Resolve Hosts On Internet?

Apr 23, 2010

The computer connects wirelessly to a router. The router is connected to the internet and that is working well. (If i use a cable connection to the router, I can reach the internet).

Why wont the wireless connection reach the Internet? It is a strong connection. It worked before wirelessly. I am on 10.04 beta, with the recent updates installed.

View 1 Replies View Related

Ubuntu Networking :: Configuring Bind To Resolve Local Hosts?

May 24, 2010

The little home server of mine has bind configured as a caching dns server. I would like to configure it to resolve local host names. I know dnsmasq can do this, so what would someone need to do to get bind to do this?The network is entirely private with all private IPs which are distributed by dhcpd.(While writing this, the feeling creeps in that it would be easier to just have dnsmasq running.)

View 2 Replies View Related

Ubuntu Networking :: IP Address Is Wrong /etc/hosts Not Working?

Jan 2, 2011

Something is definitely odd here:Quote:

[rena@mercury:~ 500]
$ hostname


View 9 Replies View Related

Networking :: Individually Address Hosts In Private Network From The Outside

May 24, 2011

The facts are as follows:

1. I have at work a regular LAN with many PCs, each with a DNS-registered public IP. Therefore I am able to address each of these PCs by their fully-qualified names and, for instance, initiate ssh sessions to any of these computers just by typing "ssh <name_of_machine>" from a terminal.

2. Within the aforementioned LAN I have just created a private network with some clients, which access the LAN through a router (a D-link DIR-825). We have created this private network for many reasons, but most importantly because we need to guarantee that the hosts in this network will remain networked among them even if the LAN goes down for any reason (which unfortunately happens often). But we still need to have access to the hosts in the private network from the LAN.

3. I am able to define port forwarding rules in the router in order to access certain services on the private network's clients. For example. I am able to access (by ssh) hosts "H1" and "H2" on the private network from a client on the LAN by defining rules for forwarding ports "P1" and "P2" on the router's public IP to TCP port 22 on the private IPs of "H1" and "H2", respectively. Then I would access each of these hosts from the LAN by using:

>ssh -p P1 [ip.address.of.router] (for accessing H1) and >ssh -p P2 [ip.address.of.router] (for accessing H2)

4. The problem with the port forwarding approach is that it is not easily scalable. For instance, If I wanted to enable ssh access to each host in the private network, I would have to define a port forwarding rule for each machine, and then REMEMBER all these port rules when initiating a ssh session from the LAN in order to point to the right host. And the problem gets worse when considering more services in addition to ssh.

5. The ideal solution would be to be have a means for addressing each host in the private network individually, in much the same way in which I address the hosts in the LAN (which have DNS-registered names). For instance, in order to access hosts H1 and H2 as in the previous example, i would like to be able to just type

>ssh [name_of_host_H1] (for accessing H1) and >ssh [name_of_host_H2] (for accessing H2)

The bottom line:

I guess I can say that what I need is some kind of combined DNS-ing and routing that allows me to communicate with the hosts in the private network from outside of it in a transparent way.

The question is: what are any possible solutions for accomplishing this? I have searched the web and found stuff about things like VPNs, reverse-proxies and NAT servers, but I really can't understand if any of these could serve to solve my problem (BTW, isn't my router doing some sort of NAT-ing already? could I just add some DNS-ing in some way?)

View 3 Replies View Related

Networking :: Referencing Hosts By (special) Hostname For IPv6 Link Local Address

Apr 30, 2010

I can reach other hosts by means of their global addresses by either the IP address or hostname (that has the global address). What I want to (also) do is have a hostname that references the IPv6 link local IP address (an AAAA record in DNS, or just the fe80::<whatever> address in /etc/hosts) and use that host name in commands to access that host. The problem is, an interface ID is needed when making such a reference.

It sure looks like the programs just pass the host name string on to the resolver library, which does not understand the significance of the '%' even though it could find and see that the name preceding the '%' is consistent with that being an IPv6 link local address (e.g. the logic could have been "split at first % and see if preceeding name is found as a link local address and accept that if so, or ignore the split otherwise" ... but it isn't). Is there a different syntax for this ... or was it overlooked in the design of programming around IPv6?I want to be able to address a host by its link local address, while still using a mnemonic instead of having to type the IPv6 address.

View 1 Replies View Related

Ubuntu Servers :: Apache2: SNI & Virtual Hosts - Multiple Virtual Hosts With Ssl And Only 1 Ip Address

Jan 17, 2011


What I want: multiple virtual hosts with ssl and only 1 ip address: In my example: server =


View 9 Replies View Related

Networking :: Stop IPTables To Resolve Source Address?

Oct 25, 2010

Here is a glimpse of my IPTABLES
I see in the column of sources the addresses being resolved to domain names is there a way I can stop this?

View 4 Replies View Related

Ubuntu Networking :: OpenDNS - 8.04 Machine Do Not Always Resolve Internet Address

Nov 17, 2010

I have an odd thing going on with DNS. I have two machine's running Ubuntu and for some reason they do not always resolved internet addresses on my Internet connection. This has gone on since the Ubuntu 8.04 when I first started using Ubuntu. Anyway, I use OpenDNS' DNS servers and I have been running perfectly.

This is what is odd. My Windows XP Machine never has the problem. It always resolves. Does Windows Possibly have some Microsoft hosted DNS server hard coded in there as a backup? Things are working fine this way so I am not looking to change. I am just a little puzzled and finally got around to asking, "Why is this".

View 9 Replies View Related

Networking :: Configure To Resolve For Hostnames When An IP Address Is Provided To DNS Server

May 21, 2010

How do we configure to resolve for hostnames when an IP address is provided to the DNS server.

Things I tried

The DNS daemon was started by the resolution failed. Find the logs below

** server can't find NXDOMAIN

View 4 Replies View Related

Ubuntu Networking :: DNS - Clients Unable To Properly Resolve The Server's Ip Address

Oct 4, 2010

I'm having really weird and frustrating DNS issues with my clients unable to properly resolve the server's ip address. They can resolve each other's, and outside systems, but not the server - at least, not correctly, and not all the time.

I have one Ubuntu server set up that does both DHCP and DNS serving to the Windows systems. The server has DNS forwarding turned on to forward to OpenDNS's servers (I've tried using my ISP's dns servers but the problem remains).
The server is *not* set up as a firewall; I am actually using a DLink router for that, and the Dlink is *not* set up to serve up DHCP nor DNS.

What I am getting is that my clients - and there are nothing but Windows clients - will not resolve the name of the server. For example, if I do: ping linuxserver

I get back a false IP address of (and I've seen once a

If, however, I put a dot in there: ping linuxserver.

I get back the *correct* IP address of, and thereafter, ping'ng linuxserver without the dot will work. Until the dns cache expires, either naturally or with ipconfig /flushdns on the windows clients.

The client *are* getting valid dhcp leases and can resolve everything happy-happy, they just will not get the proper address of the server 100% of the time.

View 4 Replies View Related

Networking :: 'Unable To Resolve Host Address' Errors With Newer Distributions

Mar 10, 2010

I'm trying to troubleshoot some strange networking problems. The pattern seems to be that only newer distributions are affected. CentOS 5.4 and Ubuntu 8.04 work fine out-of-the-box. But Arch, Sidux, AntiX, Fedora, etc. show the same pattern of errors.Certain websites cannot be found unless I disable ipv6 in Firefox. And certain addresses cannot be resolved using various terminal commands (wget, apt-get, yum, etc.). What I would ideally like is a permanent solution, perhaps changing some settings on my router, so that I don't have to deal with this each time I test-drive a new distro. I have a hunch the issue has something to do with my DSL provider (Fairpoint) filing for bankruptcy.

One more piece of information that may or may not be relevant: I recently switched a website from one hosting company to another. I noticed there was a delay of several days where I saw the old version at the old host, but viewing the site at a friend's house or the coffee shop showed the new site on the new host. This leads me to suspect DNS issues perhaps, but this is not an area of expertise.

View 3 Replies View Related

Ubuntu :: Firefox Address Bar Wont Resolve Address?

Feb 17, 2011

In firefox you can type ubuntuforums and it will bring you here via a google query.Mines stopped working the address bar goes to http://ubuntuforums/ and I get a forbidden page.I've check about : config and all is set fine

Keyword.enable = true
Keyword.URL =


View 5 Replies View Related

Fedora Servers :: Apache Doesn't Resolve Hosts?

Nov 2, 2009

Recently my home PC crashed and I had to re-installed it. I put a "clean" install of Fedora11, then copied my /home directory and some other stuff over from the old installation.I have a couple of PHP scripts I wrote, and one of them stopped working. It uses cURL, and when I enable error tracking I get:cURL error number:6cURL errorouldn't resolve host ''I started digging around and I found out Apache doesn't resolve anything at all, so it's not only a cURL problem. For example,

$ip = gethostbyname('');
echo $ip; die();

returns "" and not an IP address.My best guess so far is that Apache has no access to the DNS service (from command line and in browsers everything resolves). had a suspicion it's a SElinux issue and disabled it, but that didn't change anything.I found some old forum posts mentioning problems with chroot-ed Apache, but I haven't done anything to mine and in any case couldn't figure out what the problem was, or the solution, so I'm stuck.

View 7 Replies View Related

Ubuntu Networking :: Proxy Settings: Allowed Hosts Instead Of Ignored Hosts

Aug 17, 2011

Well, as many proxy applications, GNOME Network Proxy Preferences only allow to ignore hosts. What I want to do is exactly the opposite. I only want to use the proxy for few sites. Is it possible to define only the allowed hosts in any way?

PS: I know FoxyProxy add-on for Firefox does this, but 1)I don't use Firefox and 2)I want the proxy settings system wide not only for browser.

View 9 Replies View Related

Ubuntu Installation :: Error "mount Error: Could Not Resolve Address For Servername: No Address Associated With Hostname

Jul 14, 2011

This morning it would not boot; when I tried to wake up the system, it gave me a bunch of errors, the last ones being as follows: "mount error: could not resolve address for servername: No address associated with hostname mountall: mount /media/shares [1402] terminated with status 1" I am writing this in Win 7 since I lost ubuntu. I am using ubuntu 11.04.

View 2 Replies View Related

Ubuntu Security :: Allow Foreign IP Address In Hosts?

May 30, 2011

I found this IP address in my hosts.allowQuote:ALL: cannot find any other evidence of intrusion.

View 4 Replies View Related

Server :: Apache Virtual Hosts With IP Address?

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.

View 7 Replies View Related

Slackware :: Which IP Address To Use When I List Machine Name In /etc/hosts?

Jul 21, 2010

1) I'm not sure which IP address to use when I list my machine name in /etc/hosts, particularly after reading:


By the w]ay, Arnt Gulbrandsen <> says that # should NEVER be named with the name of the machine. It causes problems # for some (stupid) programs, irc and reputedly talk. :^)

Here's what I have now:
root@eagleswing:~# hostname
root@eagleswing:~# cat /etc/HOSTNAME


I'm not certain how to include my router in /etc/hosts so I can use it to link my PCs as stated above. I was thinking of writing (see above link): localbelkin Will this work & is it proper?

3) Do I need to make use of any other IP addresses at this link? What are the WAN IP & Default Gateway addresses used for? I am going to be serving documents & running scripts on Apache.

View 2 Replies View Related

General :: Denyhosts Keeps Adding IP Address To Hosts.deny?

Aug 10, 2010

I have setup Denyhosts to run on my server, and have been using it succesfully for the last few weeks, to allow me to ssh into my server from my home dev machine.

This morning, I accidentally typed my password incorrectly three times - and ended up being locked out of the system (tghat was ok, because that was what was supposed to happen). I logged into the server via another way and took the following actions (in the order given)

/etc/init.d/ssh stop
/etc/init.d/denyhosts stop
removed my IP address from /etc/hosts.deny
/etc/init.d/ssh start


View 1 Replies View Related

Ubuntu Servers :: Update DDNS For Fixed-address Hosts?

Apr 3, 2011

I have DDNS configured and working for dynamic addresses, but it's not quite right for static addresses yet. The DHCP server assigns the static address, but it doesn't update the DNS sever with the associated host name. Which means I have to use the IP address when accessing the host instead of the host name. How can I get the DHCP server to update the DNS with the host name associated with the fixed-address?Here is my current dhcpd.conf.

ddns-update-style interim;
ignore client-updates;


View 2 Replies View Related

CentOS 5 Server :: Apache Two Virtual Hosts On A Single IP Address?

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 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 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


View 15 Replies View Related

Ubuntu Servers :: WAN IP Address Wont Resolve?

Feb 18, 2010

Ubuntu Server 9.10, with apache, proftpd, mysql and the goodies.

I have wordpress installed and setup under /var/www/

The LAN IP address resolves perfectly to the index.php

However I can not get my WAN IP to resolve. My ISP blocks port 80, so I have my router setup to forward port 81 externally to port 80 of my server. I know the port forwarding is setup correctly and working, because I can go to websites like url and test that port 81 is indeed open.

I also have DynDNS setup on my router and through an account with them, to update my IP address with any changes, to a host name. But because port 80 is blocked I have to access it with, Ive had this system up and running before with no issues. Now I can not get the to resolve.

Neither can I get my ip address to resolve.

View 6 Replies View Related

Software :: Server Unable To Resolve Outside Address After Internet Cut Over

Jul 6, 2011

Centos 5, After switching out server to another provider the website responds as it should but the server is unable to establish connections to remote servers. Yes the internet connection is fine, I'm actually working on the server remotely.

--- ping statistics ---
4 packets transmitted, 0 received, 100% packet loss, time 2999ms
/etc/resolv.conf has opendns nameservers
search localdomain
and I've updated /etc/sysconfig/network to reflect the new IP address.

View 8 Replies View Related

Slackware :: Unable To Resolve Host Address `'

Jul 17, 2010

when tring to install (AssaultCube, UrbanTerror) i get this: unable to resolve host address `'

View 2 Replies View Related

CentOS 5 :: Nscd > Millions Of Log Entries Like 'Reloading "[ip Address]" In Hosts Cache!'

May 25, 2011

I'm getting millions of log entries in my nscd.log like the ones below. There's no connection to (or from) this IP address so I'm totally at a loss for what would cause this.

Wed 25 May 2011 06:56:49 PM GMT - 5557: Reloading "" in hosts cache!
Wed 25 May 2011 06:56:49 PM GMT - 5557: Reloading "" in hosts cache!
Wed 25 May 2011 06:56:49 PM GMT - 5557: Reloading "" in hosts cache!


View 2 Replies View Related

Security :: Use Current /etc/hosts File To Do An Ssh-keyscan Instead Of Making A Special List Of Hosts?

May 2, 2011

I'm trying to use ssh-keyscan to get some known_host file population going on, but I have a ton of hosts I want to scan, all with multiple aliases in /etc/hosts. Is there a way to use my current /etc/hosts file to do an ssh-keyscan instead of making a special list of hosts that (from what I've read) ssh-keyscan needs?

View 2 Replies View Related

Ubuntu Networking :: Port Forwarding From Public Address To Private Address?

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.

View 5 Replies View Related

Copyrights 2005-15, All rights reserved