I have recently installed Centos 5.4 on a server with 3 network cards. I am trying to enable IP forwarding which has been successful by executing the following command:
echo 1 > /proc/sys/net/ipv4/ip_forward
I tried to make this permanent by adding net.ipv4.conf.default.forwarding=1 to the /etc/sysctl.conf file.
When I restart the network service I get the following code...
I am using
# uname -rmi
2.6.18-194.26.1.el5PAE i686 i386
# cat /etc/*release*
cat: /etc/lsb-release.d: Is a directory
Red Hat Enterprise Linux Server release 5 (Tikanga)
CentOS release 5.5 (Final)
I have noticed that after few days of ideal system it will stop its network interface. To resolve this I have to login to the machine it self and then issue
# service network start
Is this a feature. If this is not a feature then what is this. As an workaround I am thinking of adding service network restart in cron tab for everyday in night when I am not using it.
I been trying to install the Nvidia driver for my recently installed centos desktop but I could not find the services that I can stop. I have a gnome. did try gdm, xdgm etc etc but no luck how do I stop the x server service ? so that I can install the driver.
View 3 Replies View RelatedIf i boot to fedora and boot back to windows i can no longer can access network/internet on windows! It says the network is disconnected. The cable is connected properly and this message is happening only because i booted to fedora 12 previously before booting into windows.
I did not have this problem with fedora 10, 9. recently i did an upgrade to 12 and this is one of the problems among the many other i am facing. In order to get internet back on windows i have to shutdown the pc and wait for a while and power on again to get network back on windows. the same issues exists on windowsXP64 and vista32.
I am connected to the internet like this pc->Realtek RTL8168D(P)/811D(P)->linksys router connected to pc by network cable --> DSL modem. the router connects to DSL by ppoe
My router's ip is 192.168.0.1. usually if i type this on my browser it will take me to the routers configuration. But a previous boot to fedora and i cant even access my router. its like it says "network disconnected".
why is fedora messing up my network connection? its pathetic that there is no OA in linux and it makes my life miserable.
I am trying to setup LDAP server on Ubuntu 10.04 and am sticking to the old /etc/ldap/slapd.conf file configuration.
I had to comment ldapi:/// from /etc/default/slapd since it was giving 'Address already in use error'. Also had to juggle with pid directory and file issues
After that I was able to start the slapd daemon (service slapd start) but now I am running into multiple issues:
1. Can't stop the service with service slapd stop
Code:
## Service stop returns 0, maybe because start-stop-daemon is not giving error
#service slapd stop
Stopping OpenLDAP: slapd.
# echo $?
0
Will switching to BDB database resolve this ?Also can't I slapcat at non-root user ??
I am new in configuring named.I want to set my firewall (Fedora 11) as a name server. The local domain is a Windows domain. I'd like internal users translate domain name into IP on this server when they go to the internet. After reading some posts on the web, I set up named as below. It seems the named does the job but with some problems.
1) When I start the server, I couldn't find the named process even if the file "named" is in /etc/init.d. I can browse Internet on the server with domain name (DNS works locally). But internal users couldn't get the domain name translated. If I shutdown the server at this stage, it will shutdown within 1 minute.
2) If I run "service named start" after the server boot up, I see process "named" and named work okay. Both internal user and local host can browse Internet with domain name. However, any command starting with "service named" has no response after this, such as "service named status" or "service named stop". I can see it shows "stopping named" and this last forever. I have to kill the process then restart named server so that named may run again.
3) If I shutdown the server now, it will take 4-5 minute instead of 1 minute in 1). The shutdown stuck at "shutdown named" for 4 minutes. Even if I kill process named before the shutdown, it will take 4-5 minutes.
It took me a week on this issue. I appreciate if you could take a look my configure files and guide me through this.
I have installed squid 2.7 in my red hat Linux box.I need some guidance regarding to start and stop squid service. Normally when squid configuration file is n /etc/squid/squid.conf and we want to start the service we use # service squid startand to stop the service we use# service squid stopNow squid is inCode:# /usr/local/squid/etc/squid.confhere the default # service squid start and # service squid stop does not work.
View 6 Replies View RelatedCan anyone here point me to a walk-through or discussion of how to use Webmin to set up port forwarding/NAT on a dual-NIC Centos 5.3 box? The layout will be simple:
Internet --- NIC1 [CentOS Box] NIC2 --- Switch to other PCs
We have a BUNCH of exposed services that are on special ports -- for example, to connect to one machine, you go in with [IP_Address]:12000, and to connect to another, [IP_Address]:12002, etc., etc. We're currently using OpenSuse 10.3 on this box, and YaST makes this criminally easy (you give it the incoming port number and the destination IP/port numbers and it just works). But OpenSuse 10.3 is nearing EOL, we're buying a new machine, and I'd like to use CentOS on the new one.
I've read the sparse Webmin documentation in their Wiki, and it leads one to believe that you simply insert a "NAT" rule. But there's obviously something they're leaving out. I *am* opening the ports in the firewall. But when I log in to [IP_Address]:port, it just times out. The port forwarding never occurs. The test in this case is SSH, and I know that SSHD is working properly because I can log into that machine just fine from another PC on the same internal subnet.
I have tried:
Code:
setterm -blank 0
which has always worked in Slackware, Red Had and Fedora. I have went into Screen saver
[code]....
Sometimes I use vnc server and start desktop. The memory use rises about 2gb during this. I need to be able to turn off the xwindows after I shutdown vnc without rebooting. Is there a way to do this?. And I don't need to know how to disable at boot thats not what I need to do.
View 5 Replies View RelatedI'm facing a challenge in setting up a simple routing between 2 networks. The situation is as follows.We're using 2 networks, 1 that handles all the office traffic and 1 that is used for storage traffic to the NAS. I'm trying to setup a simple router that will forward requests from the office LAN to the storage one, so people can access the NAS interface on the storage LAN.
So, I have a CentOS 5.5 box, connected to both networks that should handle this job. The office LAN is 172.29.38.0/24 and the storage LAN 10.1.2.0/24. IP adrresses of the linux box are 172.29.38.98 (eth0) and 10.1.2.98 (eth1).First I started by enabling IP-forwarding in the kernel:
Code:
# cat /proc/sys/net/ipv4/ip_forward
Below is a copy of the iptables in use:
Code:
# Firewall configuration written by system-config-securitylevel
# Manual customization of this file is not recommended.
*filter
:INPUT ACCEPT [0:0]
[code]....
It just never seems to get to the machine on the other side. I've verified that I can access both networks from the router and I can ping the router from my client.
It is my first time to install fedora 13 and touch linux system.
I burn the DVD edition to install offline. The installation completed and rebooted the system. However, the process stop at the startup screen. And I press escape and find that the process stops at following line: Starting Avahi daemon ...
I don't konw what this line means and how I can deal with.
My computer specification:
CPU P4 2.66GHz
RAM 512M DDR400
Motherboard GA-8IPE775-G
Display Geforce 6200
I'm trying to set up my CentOS 5 box as a gateway for my home network.I've set up dhcp on my internet interface (eth0) and dhcpd on my LAN interface (eth1).I can browse the internet from my CentOS 5 box.I can ping the CentOS 5 box from my LAN.However, I can't browse the internet from my LAN.I've enabled IP forwarding in /etc/sysctl.conf and I've disabled my firewall. I've saved these changes and rebooted. Again, no internet browsing from my LAN.
View 2 Replies View Relatedi just finished installing CentOS 5 in my laptop. While I was trying to configure my Wireless network to connect internet, I found a guide in CentOS site which recommended to start "NetworkManger" service so as to setup wireless network. I followed and it Worked great.
But i would like to understand the difference between "Network" service and "NetworkManager" service. I had initially thought restarting "Network" service would help. explaining the basic difference between these 2 services.
is it possible to restart /start/stop all services at the same time without rebooting?
View 3 Replies View Relatedwhats the difference between restarting/stopping apache using 'service httpd restart/stop' and apachectl restart/stop. I know that using 'service httpd restart' is actually a script in /etc/init.d/httpd but what about apachectl?
View 1 Replies View RelatedI have a question about port forwarding. I have an internal Red Hat server and I would like to use it as a central connection point to some back end servers. This is not an internet router setup. I was thinking I could use iptables and do port forwarding similar to an internet router but internal to internal.
Basically I would like to take any connections to port 22 on server1 interface eth0 and forward them out of interface eth1 to server2 port 22.I am finding a lot of information on port forwarding, but it is all based on using an internet router that is passing through to an internal server. I need to know how to configure a basic linux setup with no existing iptables entries so that I can do this within an existing network.Also, if there is a better or easier approach I would appreciate any direction. I don't want to do this through an SSH tunnel.I know to start I need the following to enable forwarding in the kernel and a firewall PREROUTING rule.
I am setting up a new server with 2 nics installed. Nic0 goes to the firewall and nic1 goes to the internal engineering network.
Problem is Ip forwarding is not working!
Particulars:
Server Name - slick
Firewall Name - gateone
engineering node - crooked
Routing on slick:
From crooked ( which is inside the server (slick) with an ip address of xx.xx.221.249 the only way I can ping or anything outside of the firewall ( gateone) is to turn on IPtables with this configuration:
I don't want to use IPtables. I need the ip forwarding to work.
I'm running Centos 2.6.18-53.1.13.el5 in a VM. Currently I'm studying for my RHCT.I'm trying to enable IP forwarding so I edited this line in the /etc/sysctl.conf:
# Controls IP packet forwarding
net.ipv4.ip_forward = 1
Then I ran sysctl -p
[code]....
I am unable start network service on my centos box. /etc/init.d/network start device eth0 does not seem to be present, delaying initialization lspci | grep Ethernet
Doesn't show any results. It seems os doesn't identify my NIC. I am using compaq presario model pc
I have an internal network behind a server <10.0.0.1> connected to the internet that NATs my ip <10.17.11.88> only. NAT is not allowed to any other ip addresses. When I use Transmission Bittorrent client to download torrents, The thing is that this 10.20.0.244 is not my machine and doesn't have access to the internet at all. What is happening here? Can anyone help me?
View 8 Replies View Relatedi am forwarding HTTP request to a internal server, it is quiet successful but access logs donot show the ip of the external m/c. Rather it shows the ip of the machine on which i have enabled port forwarding.
View 2 Replies View RelatedI am setting up Apache (Fedora 12) inside my home network. From inside my home network I access it without any problem. I need to set it up to access it from internet. I have the following questions. Here is temporary setup for testing purpose.
Internet-->ADSL modem (SEIMENS Speed Stream 4200)---> Apache (Fedora 12)
1. Do I have to do any kind of ports forwarding on ADSL modem. (There is no option to do port forwarding on Modem) May be I need different Model of Modem??
2. I tired to Ping my real IP for modem form another computer from internet. I am even unable to PING the ADSL 's real IP. Why it is that?
I have a Broadcom Corporation NetXtreme BCM5721 network card on my server at work.Everything works fine for a few weeks, then randomly the network connection on the server will stop working. After it stops working, I will try to reconnect with the network manager, it shows a wired connection available, it shows the "connection in progress"animation, then the "connection disabled" icon.
I uninstalled the network manager and used manual configuration, but do you think the network manager was the issue? I can't have the server disconnecting randomly every few weeks with no way to know what the real problem is. Was there an issue with the network manager with 10.04?
I'm using Ubuntu 10.04
Navigating to sound preferences:
System --> Preferences --> Sound
Under the Sound Effects tab, I changed Sound theme to "No Sounds" caused the Network Manager to disable and my wireless to stop working.
I was playing with my debian server when something went totally wrong while i was editing something on my network interface,i removed those crap that i wrote and left the network interface configuration as it was
Like for example after re-editing my network interface,it was like :
As i did a network restart, i get this error saying :
There is already a pid file /var/run/dhclient.eth0.pid with pid 2802 killed old client process, removed PID file.
What is this error and how can i fix it,because every time im re booting my server i lost my network config.
I have recently installed CentOS onto an old machine to get it up and running as a basic web/mail server. Originally the Network Interface worked ok, however I have been editing /etc/sysconfig/network-scripts/ifcfg-eth0 to try and set the IP address to be static.Now when I run the 'service network restart' command it won't bring the eth0 interface up and comes up with the following errors;
ifcfg-eth0 Line 3 DEVICE: command not found
missing config file ifcfg-ifcfg-eth0
It doesn't seem to like any of the command words, even though most of these were in the original file that worked and the ones I added to do static I have commented out.
I have been suffering a connection problem with one of my VPSs recently and I really just can not seem to figure out what is causing the issue. First of all the issue only appears to hit my home computer/network and not other people, it might sound like a routing issue but it doesn't appear to be so. When I am hit by connection issues, I can resolve the issue by logging into Dom-0 (all other VPSs are also available) and consoling the offending VPS before running "service network restart". I personally can not think of anything that would require the network service being restarted and only hit myself (and only at home on top of that).
The VPS itself is dedicated to running minecraft server and is using CentOS, when it occurs I can not SSH the server either, all other ports and methods are disabled by firewall (iptables appears to have no effect in regards to this issue either). Fundamentally I am just thinking if anybody could think of any reason the VPS would only refuse connection to myself that restarting the network service would fix. A few other notes, the physical Server is hosted within a Datacenter, running 24/7 with a static IP. No other VPSs hosted on the machine have any such issues, the machine appears running normally via console and has no visible errors or logs that I know of reporting any issues that could be causing this.
I'm having some trouble with getting my DHCP service up and running on my server. Below is my /etc/dhcpd.conf file, which I believe is the right file necessary to get this service up and running correctly. When I do service dhcpd restart it just show in red letter [Failed] next to it.
Code:
ddns-update-style interim;
ignore client-updates;
subnet 10.2.3.1 netmask 255.0.0.0 {
# --- default gateway
#option routers 10.2.1.1;
#option subnet-mask255.0.0.0;
#option nis-domain"domain.org";
#option domain-name"domain.org";
#option domain-name-servers10.7.8.1;
option time-offset-18000;# Eastern Standard Time
#option ntp-servers192.168.1.1;
#option netbios-name-servers192.168.1.1;
# --- Selects point-to-point node (default is hybrid). Don't change this unless
# -- you understand Netbios very well
#option netbios-node-type 2;
range dynamic-bootp 10.2.3.2 10.2.3.254;
default-lease-time 21600;
max-lease-time 43200;
# we want the nameserver to appear at a fixed address
#host ns {
#next-server marvin.redhat.com;
#hardware ethernet 12:34:56:78:AB:CD;
#fixed-address 207.175.42.254; } }
Well, i can not install httpd service, when i execute yum -y install httpd i get this message
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=5&arch=i386&repo=os error was
[Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')>
Error: Cannot retrieve repository metadata (repomd.xml) for repository: base. Please verify its path and try again