CentOS 5 Networking :: Add Further IP Addresses For Server

Mar 16, 2010

I'd like to add further IP addresses for my server but I don't get it. My steps :

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CentOS 5 Server :: Skip Proxy For All Intranet Addresses?

Apr 13, 2010

We have one squid proxy server running on CentOS 5.3 64 bit with Squid 2.6. it works well for me.

but my problem/question is :

Is it possible to skip proxy for all Internet addresses? and only allow proxy if clients are accessing external addresses?

right now users have to explicitly say in the browsers .. BYPASS PROXY SERVER for local addresses after check the use proxy server
and address has to be mentioned. most users are non technical so they don't use this option or put wrong setting in bypass proxy option

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CentOS 5 Server :: Use DHCP All Our Clients Use Dynamic IP Addresses For The Ease?

Sep 1, 2010

I'm new to Centos 5 (and Linux) and, after installing Centos, I configured Samba, Apche, ... w/o problems (through interactive interface). My problem is tha t I need to use DHCP (all our clients use dynamic IP addresses for the ease) but I don't find dhcpd ... nor the sample config file(s).

Note : the new server I intend to use is actually connected on a LAN with an 'old' DHCP server (still under W2K server), is this the reason why I can't find/activate dhcp on my new machine ???

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Networking :: CentOS 5 - Cannot Ping Win7 Addresses

Feb 10, 2010

I have a box at home that I've installed CentOS 5 on to. I'm new to Linux, so before connecting it up to the router I wanted to try and understand the network settings, so I connected it directly to my other PC with an RJ45 cable. From Windows 7 I can ping all known static IP addresses, but from Linux I can only ping the Linux addresses, not the Windows 7 one. Below are the TCP/IP IPv4 settings, all IPv6 settings are set to auto-assign.

Windows box (uses wireless connection for the router):
Local Ethernet Adapter
IP Address: 30.10.0.1
Subnet: 255.255.0.0
No gateway, primary/secondary DNS.

Linux box:
Three adapters:
Two onboard LAN, both configured to:
IP Address: 30.10.0.2 / 30.10.0.3
Subnet: 255.255.0.0
Gateway: 30.10.0.1
No primary/secondary DNS.

One LinkSys PCI card:
IP Address: 20.10.0.1
Subnet: 255.255.255.0
Gateway: 192.168.1.1 (my router)
Primary/Secondary DNS: my ISPs details.

The idea was to connect the box directly to the router (with RJ45) and to be able to remote login from my main PC to this one. This box is to be my home server, which I was going to put virtual machines on to for things like my development work and such.

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CentOS 5 Networking :: No Ping Response From SOME Addresses

Nov 21, 2010

I have strange issue on Centos 5.5 server.I have static IP address (192.168.58.2) on eth1 card and can't get ping response from some sites.PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.

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CentOS 5 Networking :: Multiple Static ISP IP Addresses / Servers Configuration

Mar 31, 2011

I have a CentOS5 server with dual ethernet adapters + Webmin installed as my Router / Firewall / DHCP server working successfully with 1 static IP from my ISP. I also have 7 additional static IP addresses from my ISP needing to configure to individual servers inside my network. I have configured the additional virtual interfaces, but am lost on how to route data specifically from additional ISP address to specific internal network address.

Below is my desired configuration.
98.173.159.xx1 = eth0 physical interface ==> eth1 192.168.1.1
98.173.159.xx2 = eth0:1 virtual interface ==> 192.168.1.10 ==> CentOS Server 2
98.173.159.xx3 = eth0:2 virtual interface ==> 192.168.1.20 ==> CentOS Server 3
98.173.159.xx4 = eth0:3 virtual interface ==> 192.168.1.30 ==> CentOS Server 4
98.173.159.xx5 = eth0:4 virtual interface ==> 192.168.1.40 ==> Mac OS X Server 1
98.173.159.xx6 = eth0:5 virtual interface ==> 192.168.1.50 ==> Mac OS X Server 1
98.173.159.xx7 = eth0:6 virtual interface ==> 192.168.1.60 ==> Network Attached Storage Server 1
98.173.159.xx8 = eth0:7 virtual interface ==> 192.168.1.70 ==> Windows 2008 Server 1

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Ubuntu Networking :: DHCP Server Not Handing Out Addresses?

Oct 20, 2010

I have a MacBook Pro running VirtualBox with Ubuntu 10.10 as a guest. I am trying to run a DHCP server from within the Ubuntu VM. I need to do this in order to run a multicast utility. On a stand alone machine running Fedcora I have this working without fail but within the Ubuntu VM I am having troubles. The DHCP server is starting okay, but when I use a cross over cable connected to a device the device does not ever get an address.I have eth1 bound to my ethernet jack where I am trying to source the addresses, and eth2 bound to my airport which is disabled unless I need internet access.Here is my DHCP.conf file

Code:
###############################################################################
# Amino Communications Sample dhcpd.conf file #

[code]....

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Networking :: Cannot Access Public Web And Mail Server From LAN Addresses

Aug 5, 2009

I have two nagging problems on one network which I do not have on another elsewhere, both using uptodate Debian servers. The server is on the private subnet behind a router/adsl modem. The symptoms of the one which does not work

1) Users cannot access their web site from lan. If they try, they get to the router web interface, same as if they entered http:10.0.0.138 which is the router's lan address.

2) Users cannot access smtp or pop3 service using the domain name, they can access it only using the servers LAN address.

I fear that I might have not set up the router properly because appart from that the two servers are almost identical but I do not know where I might have made an error.

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Fedora Networking :: DNS - Any Addresses Type In The Field Is Returning Server Error

Sep 10, 2009

I installed fedora lastnight, but any addresses I type in the field is returning server error, but if I type the IP address it will work, I reinstalled Fedora 11 about 3 times, samething.

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Server :: DHCP3-Server Giving IP Addresses Depending On MAC

Apr 11, 2011

I have dhcp3-server (isc-dhcp-server) installed on my Debian and now I got a question about how it's giving the IP addresses to new devices.

For example: I connected my laptop and dhcp server gave me 192.168.1.5 address. Will it always give me the same ip address when I connect my laptop or it will eventually change after some time (week-month)? If it's not changing it, then I am wrong about this.

BUT...If I am somehow correct and if it will change in a week and give me another random (like 192.168.1.8) IP even I won't change my laptop network adapter, is it possible to configure dhcp server to always give same IP address depending on what MAC it is?

To make it clear, I want that when I connect new device (new laptop/pc) dhcp server would give it random IP but same time it would note the MAC address and never change the IP on that MAC.

I know about MAC filters, but setting filters is when you know MAC address since beginning and want to assign IP for it, but in my situation I don't know the MAC address.

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Server :: Set Virtual_alias_domains For All Domains And Addresses?

Apr 28, 2010

I am looking for a code for setting virtual alias for all domains and addresses. The scenario is that when I send an email from anywhere to my server, it will send to only one address but not send to the orginal recipient.

This is my code: I think the problem may be from the regular expression (.*) for any domains/email addresses

/etc/postfix/main.cf:
virtual_alias_domains = (.*) <-----
virtual_alias_maps = hash:/etc/postfix/virtual
/etc/postfix/virtual
(.*) admin@myserver.com <----

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Server :: Using Some Application To Block IP Addresses?

Feb 16, 2011

now I have managed my rsyslogd to log the firewall into a separate file I would like to use a script which looks into this file for intruders which for example try to ping, telnet, ssh, rdp etc into my dsl connection.And then use a kind of app or firewall on my ubuntu server to block them.Yes my firewall logs them but does not block them if the policy is enabled, so they have access on through the firewall and the connect to my server but I only want some known IP addresses have access through it and this I cannot program in the firewall so I have to use some extras.Or am I thinking way to far and is there a better solution with IPtables or app?Is it possible to watch tcp connections between the firewall from outside IP addresses and the ubuntu server?

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Networking :: How To Log Ip Addresses

Oct 29, 2010

Does anyone know a good program to log ip addresses when visited or connecting to your machine? Something like tcpdump but for ip addresses, I forgot what its called.

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Networking :: Two IP Addresses Using One NIC?

Feb 10, 2010

Is it possible to configure two IP addresses using one NIC? I'm implementing a VPN server on network 192.168.1.0, ultimately to be accessed over the Internet and through an ADSL router with port-forwarding to the server. Right now I'd like to test it on the LAN, but with the VPN client and server both on the 192.168.1.0 network, that test would not be be valid.

If I had a spare NIC I could put the server on both the 192.168.1.0 network and, say, a 10.0.0.0 network, configure the client on 10.0.0.0 and test. Not having a spare NIC, I'm wondering if it is possible to configure the server with two IP addressese NIC.Virtualising hosts are able to do something similar when running guests with NICs in bridged mode. Log files show they switch eth0 into promiscuouse.In case it matters the server OS is Slackware 13.0.

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OpenSUSE Network :: Set Multiple IP Addresses Onto Server?

Jul 23, 2011

I want to set multiple IP addresses onto my server and I can then put under an alias.

But is it possible to somehow create a script in perl example that can do this for or is it only possible manually?

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General :: Logging Into Server Via SSH - Allowed Ip Addresses?

Aug 26, 2010

Is there somewhere in WHM where I can allow and disallow various ip addresses to login using PuTTY for SSH.OpenSSH Server, is not running (for security reasons).If OpenSSH is not running, is there a way to allow certain ip addresses only to use ssh.

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Server :: Bind Apache To Specific IP Addresses?

Nov 28, 2010

I have the following in my httpd.conf file

Code:
# Listen: Allows you to bind Apache to specific IP addresses and/or
# ports, instead of the default. See also the <VirtualHost>
# directive. Change this to Listen on specific IP addresses as shown below to
# prevent Apache from glomming onto all bound IP addresses.
#Listen 12.34.56.78:80 Listen 80

And when I try to start the server, I get the following

Code:
(98)Address already in use: make_sock: could not bind to address 0.0.0.0:80. I did have an Apache web server up and running about 6 or 7 years ago - but seem to have lost everything

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Server :: Sendmail Adds MX Record To Addresses

Nov 1, 2010

Im working with virtuals machines to configure Sendmail on Linux.

I work with two domains (ar and org), the configuration is similar in both, so i will write just one.

In orgs mail server:

The emails stopped coming and the server adds to the e-mail addresses the MX record. For example, if i send an email to u1@org in log appears u1@org.mail.org.

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Server :: Setting Up Postfix To Use Multiple IP Addresses?

Apr 17, 2011

I set-up his mail server for him with Postfix but what he wants I have no idea how to do.

Essentially he wants it so that the mail gateway IP corresponds with the dedicated IP of the domain and I have no idea how to accomplish this.

I found some documentation on the web saying that the fix for this was to run multiple instances of Postfix which I tried doing but each time I try to start the second instance I get the error that postfix is already running.

There has to be an elegant way to make this happen, I really hate to tell a client something can't be done even though the concept is a bit pointless, IMHO. I am hoping I can get some feedback here on if this can be done and if it can the easiest way for me to accomplish doing it.

Here is some of the config files (example.com has been put in place of the actual domain names and the ip of 5.5.5.5 is in place of the actual IPs


Code:
[root@youronlinehosting ~]# cat /etc/postfix/transport
example.com smtp:5.5.5.5
example.com smtp:5.5.5.6
example.com smtp:5.5.5.7

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Server :: Squid - Deny Streaming To All IP Addresses Of A LAN

Aug 23, 2010

I'm trying to use Squid to restrict web access on the computers of my LAN. All of the computers are using static IP address and we use our firewall to deny all HTTP access except for the proxy machine so everyone needs to go through the proxy to access the web.

Most of of the computers have access to websites that are listed on a white list that I called "goodsites". I have a range of IP address that I listed in a file called "super_users". These IP adresses are able to access everything except sites that I have put in a black list called "badsites".

I would like to restrict the use of audio/video streaming for all the IP adresses including the super_users. So far I have been able to effectively block streaming for all the IP addresses except the super_users that are able to bypass this restriction.

Here is the transcript of my squid.conf file:

acl manager proto cache_object
acl localhost src 127.0.0.1/32
acl to_localhost dst 127.0.0.0/8
acl localnet src 10.0.0.0/8# RFC1918 possible internal network

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Server :: Internet Access Only For Specific IP Addresses In LAN

Feb 20, 2010

I have configured squid server and it is working fine. I want that only specific ip addresses in my LAN should be able to access internet and for that I have given these entries in access control lists in squid.conf file:

acl all src 0.0.0.0/0.0.0.0
acl manager proto cache_object
acl localhost src 127.0.0.1/255.255.255.255
acl to_localhost dst 127.0.0.0/8
acl SSL_ports port 443
acl Safe_ports port 80
acl Safe_ports port 21
acl Safe_ports port 443
acl Safe_ports port 70
acl Safe_ports port 210
acl Safe_ports port 1025-65535
acl Safe_ports port 280
acl Safe_ports port 488
acl Safe_ports port 591
acl Safe_ports port 777
acl CONNECT method CONNECT
acl QUERY urlpath_regex cgi-bin ?
acl apache rep_header Server ^Apache
acl our_networks src 192.168.0.181/255.255.255.0 192.168.0.182/255.255.255.0

And in http access I have given this:
http_access allow our_networks
http_access allow manager localhost
http_access deny manager
http_access deny !Safe_ports
http_access deny CONNECT !SSL_ports
http_access allow localhost
http_access deny all

In this I want that only 192.168.0.181 and .182 should be able to access internet but Now the problem is that all the IPs in the LAN like 192.168.0.20 are also able to access internet. What changes I need to do to allow access to specific IP addresses. I am not using any firewall or iptables entries and i am manually changing in the firefox at client side to access internet.

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CentOS 5 Networking :: Unable To Port 8080 On CentOS VPS Server

May 30, 2011

i am not able to port 8080 on my CentOS VPS server.I have followed all the instuctions as mentioned on iptables wiki page.Also I am able to telnet my ip address and port number, But can not access from browser.

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Networking :: 1 Net Card With 2 IP Addresses?

Mar 11, 2010

Can I set 2 addresses for the *1* Ethernet card that I have on my motherboard? How would this scenario work?

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Networking :: Differences Between IP Addresses?

Apr 24, 2011

I've used two internet services to show me my IP address, and I get different results:1. Whatsmyip.org : ***.**.109.***2. ipchicken.com : ***.**.111.***All the * numbers are same, except 109 and 111. (or link me to explanation) of which one's which?

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Networking :: Get Two Ip Addresses To Communicate With Each Other?

Nov 19, 2010

How can I get two ip addresses to communicate with each other which are not in the same 255 range?

Like:

192.168.0.1
and
192.168.1.1

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Networking :: More Than One MAC Addresses On Single NIC?

Sep 25, 2010

My machine has ONE ethernet card and is on a LAN.IP address is assigned to hosts using DHCP.I can have more than one MAC address on LAN by running Virtual Machine and setting network to bridged. This way, my virtual machine simply acts like there is one more machine in the network.Running VMWare for this job is a a bit heavy on resources. Is there a way so that I can I can have 2 or more ip addresses with different MAC address on the same machine without having to run VirtualBox.

By googling, I think its related to bridging and tap. And, I am sure thatts NOT IP-ALIASING because in ip-aliasing both the ip addresses have the same MAC address.Basically, I want my system to have interfaces like:-eth0 - which was originally presentlo- thats always present :|newint0 - New interface with new MAC address and IP addresses which can access my LAN directly. Its like if I bind, let us suppose curl to this interface, its like a different connection

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Ubuntu :: Server DHCP3 Stopped To Give Addresses / What To Fix It?

Mar 7, 2011

I'm writing because my ubuntu server has started with troubles .
It's running Linux 2.6.32-29-generic-pae kernel for ubuntu server 10.04 and after the last update it stopped from giving addresses on clients connected.
Dhcp3 server it's running and the conf files are fine, but i can only use static addresses assignation now...
Also MYSQL has stopped working (installed for Bacula purpose) but now the dhcp problem is the biggest issue. I work in an office where dhcp is fundamental, too much clients (about 15) that are personal laptops also (so static assignation for clients is not a good choose).
Please any one could help me? It's two days I'm trying to figure it out without success.
also tried removing and reinstalling dhcp3-serer...no way.
Here are my conf files code...

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Server :: Configuring Sendmail To Handle Addresses But Not The Whole Domain?

Mar 22, 2011

From my main Postfix SMTP heads, I am sending just a couple select emails (primarily support emails) off to a server that receives them and pipes them into the support software. So far this totally works perfectly and I am pretty happy with the configuration. However, in order for sendmail on the support server to receive those emails I have to place them in the virtusertable of course, but I also have to activate their domain in the local-host-names file. That then causes sendmail to consider itself as the destination server for that whole domain.Is there a way to make sendmail receive email for select addresses without making it think it's the server for the whole domain? This server is only receiving email from two specific smtp servers, so I wonder if I could just permit relaying? Wonder if that would just cause a giant loop though.

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Server :: DHCP Doesn't Provide Fixed Addresses

Apr 9, 2010

Ubuntu LTS 8.04 + DHCP. Works fine except for fixed addresses. I mean all devices which need to get fixed IP according to their MACs don't get them and keep to receive random IPs from the range (although almost everytime all machines receive the same IP they got from DHCP for the first time).

The following config was created by Webmin interface.

At the one of the ubuntu forums i was advised to carry host description out of the subnet description.

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Server :: Which File Is Responsible In Converting The Mail-addresses?

Sep 7, 2010

I have a sendmail alias configured to forward mails to pagers and it was working fine . The mail relays suddenly start converting a mail address of pager into a normal mail(outlook) format address. Say , instead of forwarding a mail to [URL] Provided no configuration inside the mail directory was changed.Which file is responsible in converting the mail-addresses? Is there any other problem with my mail-setup?

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