CentOS 5 Networking :: Stuck Enabling Ip Forwarding?

Mar 26, 2009

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


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CentOS 5 Networking :: Use Webmin To Set Up Port Forwarding/NAT On A Dual-NIC Centos 5.3 Box?

Aug 31, 2009

Can 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.

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Ubuntu :: Stuck At Login Screen After Enabling It 10.10?

Nov 7, 2010

I been having this problem with the login screen after i enabled it. It shows a little window with the the ubuntu logo with my computer's name underneath with the login button. Clicking the button does nothing but when I hit enter it seems like its booting up but freezes after it says "checking battery [done]" or something like that. is it a problem with the login screen? If so how do I fix it? If not what is the problem?

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CentOS 5 Networking :: DNS Is SLOW After Enabling/disabling NetworkManager?

Mar 30, 2010

I ran into this today accidentally turned on networkmanager and it took it upon itself to rewrite some things and proceeded to make any DNS lookups on my server Especially those reverse DNS for SSH and SFTP take so long they would just time out instead of completing.. Disabling networkmanager did not undo the damage either. Short fix, Erase your resolv.conf file and add 2 lines to it as so, your nameservers!

nameserver xxx.xxx.xxx.xxx
nameserver yyy.yyy.yyy.yyy
save, and run the following commands
service network restart
service httpd restart
service sshd restart

Mine had a search line added by networkmanager and some others, when i reverted it back to as above, almost instantly after restarting the services the systems lookups were once again, lightning fast. DNS lookups were taking upwards of 20 seconds for unknown reasons after this happenned

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CentOS 5 Networking :: IP Forwarding Is Not Working

Apr 1, 2009

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.

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Networking :: IP Forwarding Not Working On Centos Server

Jan 18, 2010

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!

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.

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CentOS 5 Networking :: Forwarding HTTP Request To A Internal Server?

Aug 11, 2011

i 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.

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CentOS 5 Networking :: IP Forwarding Disables When Rebooting Network Service / Stop It To Do So?

Nov 30, 2009

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...

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CentOS 5 Networking :: TCP Connections Stuck In FIN_WAIT2 State?

Jul 21, 2009

I'm developing a simple TCP server. 99% of incoming connections terminate correctly and the sockets disappear from netstat outputHowever, a few connections hang around for indefinitely in the FIN_WAIT2 state. Now, I know that the clients in this case are misbehaving by not sending a FIN,ACK to close the connection. However, regardless of client behaviour, the connections should only remain in this state for a maximum of 60 seconds (set globally by /proc/sys/net/ipv4/tcp_fin_timeout)

Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name Timer
tcp 0 0 FIN_WAIT2


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CentOS 5 :: Enabling XML-RPC Module On CentOS Dedicated Server Box

Jun 25, 2009

I would like to enable XML-RPC module on my dedicated server with CentOs 2.2-3.2.el5 hosted on 1and1 server. How do I enable this module? What are the procedures?

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Networking :: Shorewall: Port Forwarding Port Is Closed Even After Forwarding?

Dec 12, 2009

I have just set up shorewall on my router running Arch Linux. The external network is on eth0 and the internal network on eth1.I have set it up for masquerading and that works fine and I can open ports to the firewall. But I'm having trouble with port forwarding to my internal machines.The problem I have is that when port 22350 is forwarded to on my local network, checking the port with nmap from a remote computer gives me:

22350/tcp closed unknown


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CentOS 5 :: Enabling Vga-out On A Laptop?

Mar 17, 2009

doc/tip/web page with some info on how to enable the vga-out port on my laptop?

I need it so I can hook it to a projector when I'm teaching a class or giving a presentation

I've read the centos on laptos wiki but I found nothing of assistance.

I'm using centos 5.2 on an HP 550 laptop, everything else works like a charm

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CentOS 5 :: Enabling C99 Tyes In C++?

Dec 4, 2009

I have a C application in which I was happily using stdint.h and other useful things like UINT32_MAX. Now, I am trying to move over to C++. Turns out, C++ does not support C99 and there is no equivalent header file (like climits for limits.h). So is there a way to enable C99 types in C++? Or any other equivalent header files?

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Server :: Enabling Reiserfs On Centos 5.5?

Sep 22, 2010

way of enabling support of reiserfs filesystem on centos 5.5 final

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CentOS 5 :: Enabling VNC To Work With Display 0

Feb 7, 2009

I am trying to get VNC to work with display 0 on CentOS 5.2.In the past, I had always used the information straight from realvnc,URL... which is straighforward and simple, but this doesn't seem to work with CentOS 5. Once I attempt to connect to the server, it locks up.I have searched around and found the following info for CentOS 5, but I can't get it to work. The info seems very unclear and cumbersome to get display 0 configured.Has anyone gotten the RealVNC method to work on CentOS 5?

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CentOS 5 :: Enabling Desktop Effects?

Dec 22, 2009

When i try to enable desktop effects on my dell inspiron 1440 running on CentOS 5.4 x86_64, this message is displayed:-'Desktop effects do not work with Xinerama'

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CentOS 5 Hardware :: USB Keyboard Continually Getting Stuck Keys (but Only In CentOS)?

Jan 25, 2010

I just took delivery of a new computer, with CentOS 5 installed. It does not have a PS/2 keyboard socket, only USB. I get lots of strange "key stuck" problems - usually the shift key or the cursor keys (I guess I use them the most). Or sometimes key presses do not register. It makes it very difficult to use the machine.I have tried two keyboards (both of which work fine on other machines, or on this machine when booted with a live CD). The machine is an Intel i7. Are there any known problems with USB keyboard drivers in CentOS?

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CentOS 5 :: Can't Do Port Forwarding ?

Mar 5, 2011

I did local apache server at internal ip and i wanna to do port forwarding to enter to it by my external ip address ?

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CentOS 5 Hardware :: Enabling Atheros Wireless Card?

Jun 26, 2009

I have installed centos 5.2 on my acer aspire 5610z, but I do not recognize the wireless card atheros, what should I do?

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CentOS 5 :: Enabling MySQL Archive Engine Without Compiling From Source?

Aug 19, 2010

Is there a startup option I can put in the /etc/init.d/mysqld script or an option in the /etc/my.cnf file to enable the Archive engine for MySQL or do I have to compile it from the source?


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Server :: X Forwarding On SSH In CentOS Didn't Work

May 25, 2010

I was able to do on Debian and Ubuntu Servers X applications running on remote servers where I was able to login via SSH. Tried the same with CentOS did not worked. in /etc/ssh/sshd_config


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Fedora :: X Crashes - Ssh To A Remote Centos Server Using X11 Forwarding

Nov 24, 2009

My X crashes when I...

1) ssh to a remote centos server using X11 forwarding
2) open the virt-manager remote application (the virtualization management app)
3) Open the remote console

Just to be clear, my local X11 crashes. I get back to the log in screen.

I get in my Xorg log:


Fatal server error:

-Is this enough for a bug report?
-How I can make X dump a core file for better debugging?
-Do -debug RPM packages still exist, and if so, should I install one for the X server and will this help with debugging, and if so, how do I install it.

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CentOS 5 :: Centos Stuck At First Boot?

May 17, 2010

I am familiar with linux and have done some managing of servers before. I just tried to install centos 5.5 on a server, but after booting the screen was blank and my monitor said vga mode not supported. I found online to press ctrl+alt+F1, which allows me to see the rest of the boot commands. Then after I was able to see the boot commands it says enabling /etc/fstab swap, but never says ok or gets past that part.

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Fedora Networking :: Enabling The Network In 11?

Jul 22, 2009

when I tried to configure network I came across a problem that the enable button on top of network manager GUI is disabled. So alternatively I enabled it with ifconfig command. I also configured DNS servers. But the problem is whenever I reboot my machine. I have to reactivate the network from terminal and give the DNS servers again, because DNS settings are not saved.

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Networking :: Enabling SNMP On Suse 10?

Jul 29, 2010

I need to enable SNMP on our Suse linux boxes, so that What's Up Gold can monitor them.

I need to add the community name, that I know, but where?

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Networking :: Enabling Wireless In Mint?

May 23, 2011

i cannot connect to the internet wirlessly,only via eternet cable which works fine,it tells me my wirless is not enabled

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Networking :: Ethtool Not Properly Enabling WOL?

Nov 25, 2008

I'm having problems enabling Wake-on-LAN using ethtool.I'm using ethtool 5.1 on Fedora 8. Ethtool reports that the card supports u,m,b,g for WOL modes. I can run "ethtool -s eth0 wol g", which completes without errors.If I run ethtool again, the Wake-on setting is changed to whatever I just set it to. However, when I actually shutdown the machine, the lights on the NIC don't stay on as they normally should, and any attempts to wake the machine have no effect. The machine dual-boot Windows XP, and I have enabled WOL in the driver there. When I shutdown the machine from XP, everything works just fine. The NIC lights remain on and the machine wakes up properly. So...I think I have my BIOS configured properly, and my WOL utility is working properly.

Hardware Info:
Adapter: Intel Pro/1000 GT PCI (Vendor ID: 8086, Device ID: 107C
Motherboard: Asus P5Q Pro

lspci Output:
Ethernet controller: Intel Corporation 82541PI Gigabit Ethernet Controller (rev 05)

ethtool Output:
Settings for eth0:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full


dmesg Output:
e1000: eth0: e1000_probe: Intel(R) PRO/1000 Network Connection
ADDRCONF(NETDEV_UP): eth0: link is not ready
e1000: eth0: e1000_watchdog: NIC Link is Up 100 Mbps Full Duplex, Flow Control: RX/TX


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Ubuntu Networking :: Locks Up When Enabling Wireless?

Apr 19, 2011

I've been having an issue for the last day or so. I have an HP Pavilion dv8000 running 10.10. Whenever I boot with the Wireless activated, it will lock about 3-4 seconds into the log-in screen (I'm guessing when it connects to my router). If I have the wireless deactivated (like now), I am able to use the ethernet connection, or (like now) use my phone to tether internet. But, as soon as I click the wireless to active, locks up. The wireless activity light flashes, but that's all.

I'm pretty good about updating whenever I use my laptop, but I think something in the most recent update may have broken my wireless connection.

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Networking :: Enabling WiFi On Netbook Running 10.4

Jun 2, 2010

I used to have no problems with the wifi on my Acer One netbook. After a friend played with the network configurations, the wifi is disabled.

ariel@segal:~$ sudo -i
[sudo] password for ariel:
root@segal:~# iwconfig
lo no wireless extensions.
eth0 no wireless extensions.
wlan0 IEEE 802.11bg ESSID:off/any
Mode: Managed Access Point: Not-Associated Tx-Power=0 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Encryption key: off
Power Management: off

root@segal:~# ifconfig wlan0
wlan0 Link encap:Ethernet HWaddr 00:23:4e:34:bf:bd
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

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Networking :: Enabling GSO On A Ethernet I/f Reduces Performance?

May 29, 2011

I am enabling GSO via setting dev->features |= NETIF_F_GSO;I am observing that after I enable GSO my FTP get performance reduces.setup:ftp client running on a PC (IPv4 mode)connected across Ethernet interface.Any thought on the possible issues. Note: IPv6 is enabled. System running ftp server is in running 2.6.28 Linux.

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