CentOS 5 Networking :: Boxes Appear To Be Limited At ~10kb/s When Connecting To Any FTP Server Outside Of Our Network
Jul 13, 2010
I'm having a bizarre problem with FTP transfers from my CentOS 5.3 boxes, All of my CentOS boxes appear to be limited at ~10kb/s when connecting to any FTP server outside of our network. We have no network infrastructure which would cause this, however when I use a windows based machine it is able to connect fine.
I took my laptop running Vista, and rebooted it onto a CentOS 5.3 LiveCD, and same issue.
I have checked our iptables, cleared the rules, removed the kernel modules, checked CBQ/TC it looks like nothing is limiting this. Also, other protocols work fine. Both the windows and linux boxes used passive transfers for it.
Is there anything other than iptables/CBQ which would be on a out of the box install of CentOS I should check? Is there any kernel settings for NAT connections which may cause this?
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Jul 27, 2011
I run a server that is connected to several other boxes in a private network (192.168.0.0). I have had no problems previously, but upon a reinstall of Debian squeeze I have no connectivity to the private network: a ping of other addresses on that network fail. Ping and connection to outside world is fine. This box is configured similarly to another on this private network which connects successfully. I have quadruple-checked all my basic information. I post my ifconfig below of the malfunctioning device, then the ifconfig for equivalent nic on a box connected succesfully to the private network.
Questions:
1.Could it be a cable problem? (I don't see how since the cables have not been changed I do not believe since my reinstallation).
2. What about the difference in the last lines of eth1 below and eth2 of the successful box. Is it significant that the bad eth1 reads Memory:fc3a0000-fc3c0000
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May 5, 2009
My first time installing centos server and adding it to xp home network. I am new to setting up my own network in general. I have a home windows wired ethernet xp network (simple linxs router) with 2 xp boxes and one centos5 box all connected to the same router. I just set up the centos box running tomcat on port 8080. I need to do two very basic things at this point, but am not sure what I need to do:
What do I need to do so I can:
1. Connect in firefox on one of my xp boxes and call the tomcat server running on my centos box?
2. Be able to ftp to centos box from either of my xp boxes?
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Apr 5, 2009
I recently downloaded and installed CentOS 5.3 DVD media.The media check passed. I proceed to install the operating system sucessfully. After installation, all my hardware is recognized, when compared to CentOS 5.2. Anyway, when I attempt to connect to my wireless network that uses either WEP/WPA/WPA2-- I get an error message that I cannot recall (it basically only came up when I entered the key) However, I can connect to my wireless network when it is unencrypted and no open/shared key is needed.I would like to be able to connect to my wireless network when
FYI: I am using a RealTek RTL8185 Wireless Driver.Also, I use CentOS as a workstation.
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Sep 3, 2009
I want to use centos as a developer server on my desktop before deploying my stuff to the internet.
I have a netgear DG834G router. It's IP address on my local network is 192.168.0.1 and connected to the adsl line. The router is set up to act as an dhcp server too. On the router I have reserved ip address for the nics per their mac addresses.
My server is on a dual boot desktop. The other boot is XP and works fine, picks up dhcp.
I don't know how to connect Centos to the router.
I have tried to play with the network manager but to no avail.
I can ping localhost, interface eth0 is there, but i can't ping to the router.
I have set the manager system/administration/network to get dhcp automatically.
I can't activate the eth0 although the hardware device says it is OK.
I've looked at firewall and iptalbes.
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Jul 1, 2010
I'm trying to connect to a data server (basically a big hard drive) in my lab with my computer. On the Mac that's at the workbench next to me, you enter Go -> Connect to Server. From there, enter the IP address that I have (I can't find a server name--just the IP.). It asks you which subsystem you want, queries you for a user name & password, and then opens a window with all the files. Meanwhile, on my Ubuntu machine, I have a "Connect to Server" option under "Places" on my main menu. But when I choose that, I need to select what kind of server it is, from several options that don't seem right. (It's not FTP, it's not SSH, it's not a form of HTTP, and that leaves "Windows share?") I've tried several things, but usually get back 'Cannot display location "smb://<IP-ADDRESS>/" The specified location is not mounted'. I've tried many ways of mounting this drive, but it usually gives me permission denied errors (even though I *know* I have the right login and password--I've logged in using the aforementioned Mac).
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Jun 10, 2010
I just installed Ubuntu server edition on to an old Dell desktop. The only problem is that I can't get the Internet to work. I have tried the following and I guess it doesn't work:
Code:
sudo ifconfig eth0 192.168.1.52/24 up
sudo route add default gw 192.168.1.1
Each of those commands don't give me any error and it would seem like everything works fine, until I try to ping google or any website and I get an error that tells me that no host was found. I am using version 10.04 of Ubuntu server.
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Oct 23, 2010
I can't think of any obvious reason. I have two Ubuntu 10.04 machines. Each has a two disc RAID array for redundancy. Both are on my class C network (192.168.1.3 and 192.168.1.5). Both can access internet through router and I can "reach" each with a windows laptop (I can ping, login via SSH, reach webmin, SAMBA, etc). However, all the sudden, I cannot reach either linux box from the other linux box. It fails "both ways," meaning I can neither ping, login via SSH, use a SAMBA resource or in any way see the "other" linux box from one. This seemed to occur about two weeks ago (maybe after an update?). I've been using Unison to sync the RAID arrays - but not, I cannot sync at all. The only thing I could think of is to check hosts.deny (and allow) which are distribution default (unchanged)...
If I traceroute to the router, I get "1 XXXXX (192.168.1.1) 0.543 ms 1.217 ms 1.204 ms." However, if I try it to the other linux box, I get "3001.294 ms !H 2001.280 ms !H 3001.264 ms !H" which evidently means host unreachable. So it can get to the router (which has the windows box which can see both linux boxes). I just can't think of any reason why/how this could happen? Not sure how what is wrong with hosts file (I have made no changes and it accepts ping/ssh, etc from windows machine). Any ideas would be greatly appreciated.
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Oct 12, 2010
I've set up Samba under Ubuntu for windows SMB file sharing (currently unauthenticated but soon to be backed off against A.D.) This is great within Windows where l folders are available as mounted in all applications but from my Ubuntu desktop and Ubuntu laptops, we can only access network folders and files from the File browsers and bookmarks one finds in the "Places" menu. Our issue is that most (but not all) dialogue boxes don't have any options for viewing non-local files and folders. i.e. when I'm in my web browser and I go to upload a file from our local network file server to an internet location, the "Open" dialogue box cannot see any of our local network locations.
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Feb 7, 2011
i am not able to set up a crossover connection between 2 CENTOS 5.5 boxes.
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Mar 29, 2010
I noticed tonight when I go to Places, Network, it will bring up an icon for Windows Network, and I can drill down to my Windows box. But I can't see the other Linux box (a laptop running Kubuntu), and the same behavior occurs on the laptop when trying to view the Linux desktop. The laptop is connected wirelessly, if that makes a difference. Each box can ping the others, but I don't yet know how to browse one Linux box from the other Linux box.
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Jan 19, 2009
I have a Mandriva linux box connected by cable to my router. When I stream audio using this box it crashes all the wireless computers on my network. There is no effect on wired computers. All but the one computer are windows (xp or vista). The affected wireless computers are not able to even find my wireless network. I have to reboot the router to get them online.
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Mar 19, 2010
how to connect my laptop with centos5.3 to connect to a wireless network.
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Sep 20, 2010
Currently my office use a Cisco Firewall which will only allow the ANYCONNECT utility to do the vpn connection. I found a Linux utility (OpenConnect) which will do the same thing, but allow me more flexibility with my networking needs.What I ultimately would like to have is to have a switch that I can connect any network device into it and be connected to the office. IE (my IP Work Phone and Computer) Currently I have is a computer with fedora 13 and two network cards eth0 (home network - connected to a router) and eth1 which I would like to connect a switch to. OpenConnect communicates fine and I can see the work network from the Fedora machine. It creates a vpn0 tun/tap device and I don't know how to pass communication to/from the eth1 device.
Do I try to iptables the ports for the phone and services I need on the computer? Or do I build bridge; and If I do what am I bridging. I have tried making a bridge from eth1 to vpn0 which reply's with unsupported device or something like that.Unfortunately my network skills are bit limited and my office says "it can't be done". Their solution is for me to buy a ASA5505 (or something device) and have a static IP. I would have to make it work as my router and even then it will only DHCP 10 ip addresses; which will cause a shortage of IP addresses in the house.
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Feb 11, 2010
I am looking for a gigabit network card for my centos 5.4 server. I am looking for something known to work well with linux. I have been on the bestbuy site and I found a DLink (DGE-530T) card with support for linux from the vendor but after reading feedback from users with that card I am not so sure it is linux friendly. I am now thinking of buying online.
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Jan 29, 2009
ok, we had to move one of our databases due to failing hardware. This box is newer than the old but it's just dog slow. 1st I thought it was mysql but now I am realizing it's the network. As a test, I tried copying a remote file to that box and the old server (located at the same co-lo, same provider), same switch, etc.Here are the results;
Old server:
access_log.1 100% 4192KB 1.4MB/s 00:03
New Server:
access_log.1 100% 4192KB 72.3KB/s 00:58
So now I see why people were complaining about webpage load times, etc. I can't figure out why the network latency. I looked around a bit, see below for some things, I thought mtu, nic speed, etc.
mii-tool shows;
eth0: 100 Mbit, full duplex, link ok
eth1: 100 Mbit, full duplex, link ok[code].....
Are there other things I can type to test or provide more feedback somehow to get more information.
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Sep 24, 2010
I'm setting up my server under CentOS 5.5 (text mode) and I installed cherokee server but I couldn't reach it with the ip given by ifconfig. So I figured it might be an problem within cherokee. I also wanted to install webmin so I did that to see if I could reach that one. But also the webmin server is not reachable (I know the port number should be behind the ip ). So if I look up ifconfig I see the server has got an local ip (192.168.1.42) but I can't reach it from another computer in the same local network.
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Dec 20, 2009
I'm still learning my way around CentOS and linux in general... Using CentOS 5.4
BUT, I used the scripts from HowTo/Chroot Vsftpd and it did not work with the non-TLS script config, but the with TSL worked great. I wasn't sure where to put the vsftpd_virtualuser_config.tpl file but I copied it over when the script failed to find it... to where it was looking.
So I think it's working but my question is, TLS doesn't use port 21 but the script defaults to that port. I'm using FileZilla from an XP machine at work and I'm forwarding all the ports given in the HowTo. So I'm forcing the client to use TLS on port 21 but it hangs on the connection. If I use non TLS I get in but it tells me it requires TSL. I've had no luck with vsftpd in the past and this is my next attempt.
Quote:anon_world_readable_only=NO
anonymous_enable=NO
chroot_local_user=YES
guest_enable=NO
[Code]....
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Feb 15, 2010
I have OpenVPN running successfully on a CentOS Linux server. All remote clients connect without a problem and can ping the server LAN (10.5.0.0/24) . The server address is
10.5.0.1. All network shares on the server are available to the remote clients via SAMBA shares and this works well.The problem is that I am unable to get the remote clients to access services on the LAN clients. For example, there is a webserver running on a Windows XP PC (on the server LAN @ 10.5.0.2) with no firewall enabled. The remote VPN clients can ping this webserver at 10.5.0.2, but cannot browse the webserver at [URL]. All clients on the server LAN can however browse the webserver. The remote clients are using Windows XP and VISTA with OpenVPN 2.1.1.
I am new to VPNs and networking, but from my research, it seems as if this may be a routing issue. I would appreciate any help you may give in getting the remote clients to access the services on the LAN clients (other than the server @ 10.5.0.1).
The server configuration is:
local 192.168.10.6
port 1194
proto tcp
[code]...
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Dec 1, 2010
Whenever i try to create a account either then the root and login as it i get a error Access is Denied if though the password is correct.
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Sep 8, 2009
I follow instruction on how to install ISPConfig2 in CentOS 5.3. CentOS 5.3 ISPConfig 2 At part 10. MySQL(5.0), I stuck with an error. Said that "Host is not allowed to connect to this MySQL server. What is the problem? Why not allowed?
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Nov 21, 2010
I am working on a project where I need to connect to a remote MS SQL Server database with PHP from a CentOS 5.5 server. I was able to get it installed and working on my Mac OS X 10.6 laptop with unixODBC and FreeTDS. However, I am unable to get it configured on my CentOS server. unixODBC and FreeTDS were installed, but when I try to connect, I get the following error message:
Connection Failed:[unixODBC][Driver Manager]Can't open lib '/usr/lib/libtdsodbc.so.0' : /usr/lib/libtdsodbc.so.0: wrong ELF class: ELFCLASS32
From what I could find by scouring the internets,it appears that I have 32 bit unixODBC (or FreeTDS, I'm not sure) installed (libtdsodbc.so.0 is symlinked to libtdsodbc.so.0.0.0) and it needs to be 64 bit. However, when I try to install the 64 bit version with
yum install freetds.x86_64
I get a message that it is already installed.Is there something else I need to do to get around this error? I'm a developer and not a server, so I'm not sure where else to go.
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Feb 27, 2010
I have a CentOS server that I can connect to over my local network. The computer I'm currently on is on that same network and can access the internet. My server can not connect to the internet. The network card is obviously connecting to the network since I can access the server locally with SSH or HTTP. While in the terminal for the server, I type wget google.com and the server can not find the specified host, so this leaves me to believe it can not access the internet.
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Mar 2, 2010
I recently went back to Linux on my netbook because Windows 7 was too laggy (1gb of RAM, go figure). I've never been able to connect to the protected wireless network on my campus without using Windows, though, so I was hoping someone could help me finally get that figured out.
The school has a how-to for connecting to the network using various operating systems, including Linux, here (scroll down to the bottom to choose OS). After following the guide through the CA certificate it mentions, the network manager tries to connect for a while then just sort of times out and asks me to enter the information again. Using Wicd, I noticed that this timeout appears to happen when trying to obtain an IP (after authentication).
My system: Acer Aspire One AOA150 with an Intel 4965AGN wireless card (installed by me a few months back, have had no problems with the card itself not working). I've installed Kubuntu 9.10 Netbook edition and done all available updates. My campus offers an unprotected "Visitor" network that I can connect to without issue, but they limit what you can access using the unprotected network so I need to be able to connect to the WPA2 one.
I've tried getting help from on-campus IT but keep getting told that none of them know how to use Linux, which makes me wonder who exactly wrote the how-to on their website... The guides on the website are for older versions of Ubuntu, but I figured they would remain applicable on a later-version Kubuntu install.
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Oct 2, 2010
When I try to use Nautilus to connect to another computer on my network, and I attempt to connect using the name of the Windows XP computer I am connecting to, I get the following error; Could not display "smb://computername/". Error: Failed to retrieve share list from server Please select another viewer and try again. However when I attempt to connect using the IP address on the network, it connects instantly. smb://192.168.1.101/ Why doesn't it connect using the computer's name? What am I doing wrong?
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Oct 24, 2010
So, I'm stumped. Ubuntu studio didn't come with nm-applet, so I installed it myself. Now that I have it, I can't connect to my network. Here's the output I get when I run it in the terminal:
Code:
** (nm-applet:1979): DEBUG: old state indicates that this was not a disconnect 0
** (nm-applet:1979): DEBUG: old state indicates that this was not a disconnect 0
[code]....
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Mar 17, 2011
The more I use Windows, the more disgusted I get with it lol. So I would really enjoy using Ubuntu on campus instead of Windows, but I can't seem to get it to work. They have PDF files explaining how to connect with Windows XP - Windows 7 and Mac OS X, but nothing for a Linux distro. Here is the link to the PDFs [URL], and here are the settings I've tried to use to connect [URL] . I know that the CA is right (unless I need to us the Ubuntu version).
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Oct 6, 2009
I am a newcommer to Centos. I should connect to internet via a pptp vpn connection. I created the connection in "network connections". In other distrows I could connect to created pptp vpn connection simply by clicking on network-manager-applet and selecting the connection, but there is no network-manager-applet in Centos. Is there any way to connect to the vpn connection I created or I should go to do it by manually editing config files?
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May 26, 2010
it is possible to have the following network configuration: a central location called A with an ISP and two more locations (let's call them B and C) with diferent ISPs and to have a vpn connection between A and B and A and C? More exactly I have a central location with a CentOS 5.3 running as a gateway and I want to know if it's possible to have a computer from the location B and C connected to A through a VPN connection. I don't want computer from B to see the computer from C, is not necessary. What kind of equipment do I have to put in places? Routers? Managed switches? As a start I think that it have to work with a router in location B and one in location C and in location A I think that a managed switch that can manage vpns it will be ok.
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Jan 12, 2011
I am running fedora 14 and have tried to setup VPN access to work. I used the simple networking GUI program. Another engineer at work uses ubuntu and that is how he accesses the VPN. I think that I did everything right but get this generic 'VPN connection failed' message. I am trying to connect to a monowall firewall and have the IP address. Yes, I have an account but am just trying it for the first time. I turned on all of the options available which seemed correct based on the instructions that I had. I have contacted my sys-admin to try to find out what the monowall doesn't like. However, I am wondering if I might need to open an outgoing port on my linksys home router/firewall and, if so, which one?
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