Server :: Redirect Local DNS Query To Remote DNS Server On Non Standard Port?
Feb 19, 2010
The issue is that my CentOS workstation is in a vlan from where the Intranet's DNS servers are unreachable. For browsing the web there is an ISA proxy server, which I presume resolves DNS for my firefox. However, wget, host, ping and aria2c fail to get any sort of DNS resolution since they're being run from command line.I have exported HTTP_PROXY value, which provides me internet access on console, but,only when I connect using IP address. It fails on name resolution.
My question is:May I redirect the DNS queries to my home PC which would be running a DNS server on a non standard port?I was thinking of putting nameserver 127.0.0.1 in /etc/resolv.conf and then put iptables rule to redirect 127.0.0.1:53 UDP to a.public.ip.address:3535 UDP..I don't know if I am shooting blanks or what, I am not very much aware of this kind of setup.My main need is to provide DNS resolution to console apps.I want to utilize my company's idle bandwidth for bulk downloads, so, using proxy, SSH tunneling through my Home PC is out of question.
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May 26, 2010
i have a problem........ How to redirect local http port to remote ip ddress(192.168.10.64) using iptables..my destro is Centos 5.3 my rule is this iptables -t nat -A PREROUTING -s 0/0 -d <my local ip> -p tcp --dport 80 -j DNAT --to-destination 192.168.10.64
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Dec 30, 2010
I have a ClarkConnect (CentOS based) box running as my home router on a RR connection. I had the DNS servers set up to use Google's DNS server. I want to change them back to the local DNS servers but I can't find an obvious/easy way to get those address short of a) reconfiguring the router's network to DHCP them (would rather not interrupt everyone) or b) calling their tech support (kill me now!). Is there a command line tool/command I can use to query the DHCP server on the external NIC to see what DNS servers it would set me up with w/o munging my existing setup?
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May 19, 2010
We've got crontabs set up in /etc/cron.d to run various things, and we have them running as a specific local user.
Watching the LDAP logs, I can see the servers in question making requests for that username to the LDAP server every time cron runs, even though that user isn't in LDAP and is only local. nsswitch is configured to do "files ldap" as well.
The constant stream of LDAP queries is killing LDAP and making it impossible to log into our boxes.
why cron is querying LDAP for a local user?
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Nov 9, 2009
I'm using iptables with modules ip_contrack_ftp to be able to use passive ftp. It works well as long as port 21 is being used as listening port. Is there any way to make it work when I configure my ftp server (vsftpd) to listen on an alternative port, lets say 21001 or something? The helper module only seems to be working properly with the standard port, so I was wondering whether there was a way to "tell it" that another port is being used? I mean, of course I make a rule in fw to allow traffic to the alternative port.
But once it's time to start passive connection, then the iptable module cannot handle it properly. I could solve the problem by making a range of passive ports in the ftp-server configuration and allow the incoming traffic to them, but then using helper modules doesn't make any sense. I just want to allow the traffic to the listening port and then want the ip_contrack_ftp module to take care of the rest. This is what I do today - but only port 21 seems to be working. Is there a way to do this with a non-standard ftp port?
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Jul 12, 2011
I am having problem to collecting email from remote POP3 (all the emails for a domain is stored here) and distribute it after collecting to several users defined to Linux server. I have install postfix in Linux server for email distribution.
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May 18, 2009
I need to output of the script to the remote server via redirect. I created a simple script for your reference.Quote:
#!/bin/bash
W=`/usr/bin/w`
FREE=`/usr/bin/free`
[code]...
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Aug 28, 2010
* a router/gateway. The external interface have the public IP, an other the DMZ, a third the internal room* a DMZ with the web server* an internal network (internet public room)I redirect the http port 80 to the web server. You should see him there.But I can't see this web site from the internal room. From the public IP /URL I have some sort of non existent message (sorry forgot to copy it). If I call for the private IP, I get the home page (but not the CSS files)the gateway nat's the networks.What is the trick to see the web site from the internal network?
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Mar 29, 2011
I'm doing some commands on a remote server (using ssh to log on to the remote server, did a ssh key swap), how do i redirect the output of a command back to the local server ?the person who helps me out is my HERO i'm really stuck on this and it would bring me a lot further if i get this to work
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Jun 4, 2011
I have a website example.com, serving pages on port 80. I want the url example.com/redmine to be rewritten to port 3000, where my redmine server is running, without actually changing the URL. So the user typing in example.com/redmine/test would serve up example.com:3000/test, without the user actually connecting through the port. I know this can work through CPanel, but I don't know exactly how it was implemented. I'm looked at how mod_proxy, mod_proxy_html, and mod_rewrite,
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Mar 25, 2011
I am trying to show library content (asp files, IIS server, MySQL database on Windows Server 2003 - Inetpub/wwwroot/library - 192.168.0.3) publicly. But Apache webserver is on Linux machine. In one of previos topics I was adviced to mount this remote machine webfolder into Linux /var/www. Well this way it want work. I was adviced it can be done through redirecting.
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Mar 22, 2010
I'm trying to workaround a limitation in a server application. The limitation is that I can only connect to a LOCAL mysql database. I am trying to fool the server in to using a remote mysql database. I was hoping to do this by simply forwarding 3306 to another server on the same subnet.To that end I've set up iptables rules to forward all connections to port 3306 to a non-standard mysql port on a remote server. This works, except that I need to deal with the loopback interface in a special way and I'm stuck.
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Dec 5, 2010
I have set up an openvpn server on ubuntu via port tcp 443. The server use a public network and almost every ports are blocked (not 443) So when a client connect to the server, if it send traffic needing a blocked port, the connection cannot been etablished of course. So i d like to know if it is possible to redirect all incoming traffic on the server to an other unblocked port (like 443) to bypass firewall.
I dont think openvpn offer this possibility but maybe with linux it is possible..
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Mar 22, 2010
I'd love a hint or two on the following problem. I've set up iptables rules to forward all connections to port 3306 to a non-standard mysql port on a remote server. This works, except that I need to deal with the loopback interface in a special way and I'm stuck.
Code:
iptables -t nat -A PREROUTING -p tcp --dport 3306 -j DNAT --to 128.XXX.XXX.XXX:3197
iptables -A FORWARD -p tcp -d 128.XXX.XXX.XXX --dport 3197 -j ACCEPT
iptables -t nat -A POSTROUTING -j MASQUERADE
Since locally-generated packets will never hit the PREROUTING rule, you'll need to setup a near identical rule using OUTPUT to make it work. Here is what I've tried:
[Code]...
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Feb 19, 2011
I have had a look at the the information on the ubuntu forum about this but am having trouble getting the server to do what i want it to do.
I have a VPS running ubuntu 9.10 and i am trying to set it up to redirect port 25 to a remote machine via a VPN connection (remote machine connected via VPN)
i have tried setting this up in the firewall using webmin but it is not working.
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Oct 29, 2010
I set up a DNS server, and it works fine when being queried from other hosts.But if I query it from localhost (by using nslookup), it reports error:
======================================
** server can't find www.example.com: NXDOMAIN
======================================
[code]....
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Oct 15, 2010
As many developers probably do, I have a Windows based machine on which I run XAMPP locally to test my code and a Linux machine with Fedora as my remote server.As I sometimes use .htaccess as a way to authenticate some parts of the website, I end up having two .htaccess files: one with the local path (something line D:My_Webs) and one with my remote path (something like /var/www/html/) to the password file.I have searched high and low, but I cannot seem to find any trick so that I only have to maintain one version of the .htaccess file which can work on both Linux and on Windows machines.
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Jul 9, 2010
Here's my (admittedly complex) situation:
I set up a dynamic DNS address for my home network. Let's call it [URL]. Then I set up one of my machines with a bind9 DNS server and pointed my router's DNS setting to it. I did this so that I could resolve awesome.server.com from machines inside my network and have them correctly find my server. Then I set up a second machine to serve web pages using [URL]. I did this by forwarding port 9200 on my router to port 80 on that machine. This works, but of course, it only works from outside my network.
What is the best way to get [URL] to work from inside my network?
I've tried setting up the iptables on my server to forward that port, but it just times out. I used these rules that I found by searching the internet:
Code:
iptables -A PREROUTING -t nat -i eth0 -p tcp --dport 9200 -j DNAT --to 192.168.0.300:80
iptables -A INPUT -p tcp -m state --state NEW --dport 9200 -i eth1 -j ACCEPT
However, those rules might be failing because they are intended to forward ports requested from outside the network. I must admit, this iptables stuff is way, way over my head. Is there a different method that I must use to make it work inside my network? Or is there a better way besides iptables?
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Aug 27, 2010
I have a remote drive mounted on my system(ubuntu 10.04 x64), and i have the contents of that drive backed up to dropbox. the problem is, if i unmount the drive, the files disappear from dropbox. is there a way to mirror the contents of the network drive to a localfolder(preferably in such a way that all changes and file deletions are changed on the local folder instantly, but unmounting doesn't delete it all)? It looks like rsync would work, but im not sure how to make it work.
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Jan 26, 2011
I have a problem while copying files from a remote computer to my local one using the scp command. I am sure that I am using it correctly, please check it below:
---
blah@blah.com:~/g4work> scp blah2@blah2.com:IndirectMethod_Spher...s/H_1.mac.root .
---
What I get in return (instead of the statement saying 100% of file copied) is:
---
On this machine the G4SYSTEM=Linux-g++
---
The interesting point is that the above returned statement is one of the Environment variables set on both the machines that are necessary to work with a toolkit called Geant4. Here is what I get when I type 'printenv | grep G4' just to show you (note the statement in bold):
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G4LEVELGAMMADATA=/home/blah/geant4/geant4.9.3.p02/data/PhotonEvaporation2.0
G4INSTALL=/home/blah/geant4/geant4.9.3.p02
G4LEDATA=/home/blah/geant4/geant4.9.3.p02/data/G4EMLOW6.9
G4NEUTRONHPDATA=/home/blah/geant4/geant4.9.3.p02/data/G4NDL3.13
G4VIS_BUILD_OPENGLX_DRIVER=1
G4RADIOACTIVEDATA=/home/blah/geant4/geant4.9.3.p02/data/RadioactiveDecay3.2
G4ABLADATA=/home/blah/geant4/geant4.9.3.p02/data/G4ABLA3.0
G4LIB=/home/blah/geant4/geant4.9.3.p02/lib
G4VIS_BUILD_RAYTRACERX_DRIVER=1
G4LIB_BUILD_SHARED=1
G4VIS_USE_OPENGLX=1
G4UI_USE_TCSH=1
G4VIS_USE_RAYTRACERX=1
G4REALSURFACEDATA=/home/blah/geant4/geant4.9.3.p02/data/RealSurface1.0
G4SYSTEM=Linux-g++
G4WORKDIR=/home/blah/g4work
---
The other thing that I would like to mention is that these Geant4 Env. Variables are loaded each time a new (bash) shell is started as a result of the bash login script.
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Jan 7, 2010
A lot of activity is happening on our local server and I want to know which port is getting the most used and which daemon is using the port. I think it will be some modification of netstat command.
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Oct 26, 2010
I recently purchased a linux VPS from [URL] just to learn and play around with. I currently ssh into the machine via Putty from various Windows boxes. Is there anyway to throw some mp3s on the remote server and then have them play locally? Server is currently running Ubuntu Server 10.04.1.
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Aug 14, 2010
I am having trouble to make my SSH server working with remote machine.
Code:
telnet 192.168.1.102 22
PHP Code:
[Code].....
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Jul 29, 2009
I'm new here and hope to profit from your immense linux knowledge and of course to share my own experience where I can.
I'm in a student organization and we use a file server that runs linux. I can log in through ssh and copy using scp using login and password (no rsa/dsa keys because most users are windows users using winSCP and they're lacking in computer knowledge so we don't require them to mess around with keys)
However, I don't have network access everywhere, so I'd like to make a copy on my laptop harddisk of some of the folders I use most frequently. Note that I don't need it to copy files from my pc back to the remote server so I don't need two-way sync. Deleting the local copy every time and downloading a new full copy is not an option as we are talking about several gigabytes and the download speed is limited. Normally I would use Unison, however, this requires unison to be installed on both pc's and I can't install any software on the file server so this is not an option.
Any ideas on how to achieve this? I'm reasonable knowledgable about linux so I don't mind tinkering with some config files and using command line applications.
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May 5, 2011
Is it possible to restrict telnet connection from remote to my server(linux -centos5)?
=================
Ex : [root@localhost]# telnet 10.0.0.33 80
Trying 10.0.0.33...
[code]...
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Jul 24, 2010
I would like to experiment a "green" idea of virtual desktop where multiple users are served by a single powerful machine.
I have a server running 24/7. The monitor of this machine is turned off most of the time and the OS is on the login screen.
Other users, in the same local network, use less powerful machines, which could be a thin client or an old Pentium 3 machine. They access their accounts remotely and work with the GUI as if they were sitting in front of the server. Each user sees their own desktop (different themes, screen resolution, etc.). And of course it can happen that several users could log in at the same time.
The usage is modest: mostly web browsing and the usual default applications (office, wine, gimp, etc.). In particular no games or any demanding applications. The users want to use their desktop in graphical mode only.
Question: How do we call this way of using a server? Is it possible with Ubuntu? And how to implement it?
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Sep 22, 2010
I have a fast computer in my office and I want the person using the slow computer in the same office to boot up and see the login window (gdm) and log-in from there into the fast computer and be able to use their session on the fast computer the same time I am locally logged in to the fast computer as a different user and session.Is this best done through XDMCP? Where is a good tutorial on how to set this up?
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Aug 21, 2010
I've two internet based server ( xx.xx.xx.xx and yy.yy.yy.yy ) The Y server is running VNC server and is responsible for answering to VNC sessions. But I need to hide the IP of Y server so I want X server to be as VNC Proxy and redirect all VNC sessions to Y server.
I guess the best way is to use iptables but actually I can't get it working so
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May 13, 2010
How can I make the user in remote LDAP server to be used to authenticate Local Linux server ?
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May 27, 2010
configure nagios to monitor custom port on a remote linux server..
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