Ubuntu Networking :: Bypass Router DNS Caching With Public DNS (but Keep DHCP)?
Dec 18, 2010
My router is crap. If I use DHCP it sets all the computers DNS to itself and all DNS requests get cached in the router. It even starts to loose some DNS request if to many are made at once. On my windows PCs this isnt a problem I just set DNS to google's public DNS servers (8.8.8.8 & 8.8.4.4) and bypass my router and ISP alltogether but when i go to pref>network_connections i have to either set DHCP or manual, there is no option to set DHCP with custom DNS.
I'm sure there must be a way to do this in terminal, can someone tell me how?
I'm using ubuntu 10.10.
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Feb 12, 2011
My Ubuntu server is now providing routing duties to my network, but I'm having trouble opening ports to my network. I have a DynDNS account, so the IP is always current, but I can't ping even my IP directly.
My network map looks like
Internet > SpeedTouch DSL modem with DHCP > eth1 > Ubuntu > eth0 > LAN
With the modem providing a 192.168.1.xx IP to eth1, I can browse fine. The default gateway is my modem. I switched to the public IP of the modem so I could use iptables for firewall duties, but I was locked out of the internet. No gateway was set when I did that, but eth1 received the public IP of my modem.
How can I use the public IP assigned to eth1?
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Jun 3, 2010
I have a registered domain (let say domain.com ) with a web server (www.domain.com) hosted somewhere online.
I handle the mail part in my private network, by giving the MX my WAN IP (111.222.333.444 )and NAT routing mail stuff to the mail server (10.7.167.3) It works fine.
I will have to handle sub-domains (foo.domain.com & bar.domain.com) and also another domain (anotherdomain.com) in my network. In that case NAT routing isn't going to work ...
What do I need to set this up ? I guess I need a DNS server in my network but I'm not sure if there won't be a conflict somewhere with the Registrar's DNS and mine. Or do I have to take the whole DNS of my domain on this new server and make it half public/half private in some way ?
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Aug 5, 2010
following are my Linux router information
eth1= WAN IP= 110.88.89.66/32
Gateway= 110.88.89.65
eth0= LAN IP= 192.168.1.1/24
Chain POSTROUTING (policy ACCEPT)
target prot opt source destination
MASQUERADE all -- 0.0.0.0/0 0.0.0.0/0
[Code]....
My ISP gave me IP Pool 110.88.90.68/29 to use this on my LAN. my question is how can I use this IP pool on LAN side interface. i think now its simple. 192.168.1.0 /24 is my LAN network and I can not change this, because i have near 180 PCs on my LAN.
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Sep 29, 2010
I installed PCLOS 2010.07 into my laptop and dual booting with windows vista. Now I got a weird problem that is when I connected linux to my wifi router, it cannot obtain IP! (it still work correctly in windows, problem just with linux) I had to manually set ip and that worked. Now i wonder what is happening, because I didn't see this problem with PCLOS 2009 borrowed from my friend few months ago.
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Dec 9, 2010
Fresh install of 10.04.1 server; installs seamlessly; finds network no problem.
However, establishing static connection is driving me batty. Will not take. I've reconfigured "interfaces" file several times. My fingers are numb ifdown-ing and ifup-ing and /etc/init.d/network restart-ing.
I have two files in /etc/network ... interfaces and interfaces~ (one static and the other dhcp). I can switch them in and out of play. The dhcp works and pings out like a champ. static is dead, just dead. Cannot ping router ... nothing.
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May 23, 2011
when I change the hostname on my Ubuntu server, the DHCP clients table in my router is dropped.I'm running 32-bit Ubuntu Server 10.10. My router is a Linksys WRT54GL with firmware version 4.30.15. I'm changing the hostname by modifying /etc/hosts and /etc/hostname. I've also tried changing the hostname using the Linux hostname command in a terminal, but this does not seem to behave correctly according to the manpages (it does not actually change the hostname, or update either of the aforementioned files).
I've also tried using a different router - a Linksys BEFSR41 - but the DHCP table is still dropped when I change the hostname on my server (although this router is not all that different from my other one).
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Jan 24, 2009
I noticed that my internet connection wasn't automatically brought up each time I logged into Fedora so I opened the system-config-network tool and edited my network adapter by checking the box marked "automatically start at boot/login." To my surprise, the connection went down and upon trying to click on the device to let the manager bring up the connection the greyed-out phrase "device not managed" appeared underneath the device name and wouldn't allow me to connect.
Even when I used ifconfig/dhclient to get the connection up nothing happened. I could get the router to assign an IP address through DHCP, pinged a few sites to make sure it was legit, but still couldn't use firefox to browse anything. Seems as if network manager GUI is conflicting with command line attempts to bring the network up. I'd like to permanently disable system-config-network if possible because it's acting screwy!
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Jan 31, 2010
I've only been using linux for a few days so I don't know all the tricks. I'm pretty savy configuring windows networks however.My adapter is (according to windows) a: CNet PRO200WL PCI fast ethernet adapterLinux says it is a: 21x4x DEC-tulip compatible 10/100 EthernetI do seem to be getting an ip address from the DHCP router, but I cannout ping any other ips or connect to the internet.I've tried a bunch of different options, switching things back and forth, but it still doesn't work, and honestly i don't even know what some of the options mean.
ALSO, if this helps:
paladin:~ # ifconfig eth0
Eth0 Link encap:Ethernet HWaddr 00:08:A1:03:3C:99
[code]....
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May 13, 2009
the only error message I can find comes from "dmesg|tail"all it shows is
"no IPv6 router"any body know what is going on here or where where to look for more clues the next time I get around public wifi Oh the windoze washers and apple polishers don't seem to have any problems at all
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Feb 14, 2011
Within the documentation of example OpenVPN setups there is a setup that shows an OpenVPN Server with two network interfaces. One interfaces is plugged into the public internet network and the second interface is plugged into the private network.
Normally I assume that it would be best to place the OpenVPN system inside the network behind the router and firewall and open only the ports needed on the router to allow access to the OpenVPN system. All other router ports would be closed. This is the first example they show. To see what I am talking about see page(s) 6-7 here -> [URL]
If one were to use the two interface public facing setup, when would that setup best be justified? I guess if you didn't want to open any ports on the router/firewall then this could be justified but then you have to lock down this public system individually instead of having it protected by the network firewall.
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Feb 15, 2011
I want to have a firewall that is connected to my modem and router and have it function as just a firewall no dhcp no routing is that possible?
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Jul 6, 2010
My ISP provides my internet via DHCP. I have a home wireless router to provide internet access, wired for my desktop machine and wireless for my laptop. My question is: Is it possible to configure the router (the Access Point) to provide internet to the desktop and the laptop via static IP? Currently I have managed to configure the internet to them via DHCP and it works. I am just curious to know whether it is possible to provide the internet for them by static IPs, given that the internet that actually goes into the Access Point (the wireless home router), is DHCP.I fiddled with this a lot yesterday, but I only managed to get a working configuraton by DHCP for both the desktop and the laptop. If I supply them with static IPs, I can only ping the Access Point, but not beyond it. So does it at all make any sense to try to configure them by static IPs, i.e. is that virtually possible?
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Aug 16, 2010
I am trying to set up a DUAL WAN Load balancer on linux. All i want is just the dual wan loadbalancing and nothing else not even the firewall service. Also what would be the ideal configration for that system
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Oct 22, 2010
Back in April I set up a Ubuntu DHCP server and a multiple VLAN network [URL] to migrate our various servers, workstations, etc off the 192.168.1.1 /24 network that everything was on because we where running out of address space. I built out the new network and everything worked great except our AD server would never get an IP address from the DHCP server (static reservation) and even if I set the IP statically on the AD server it couldn't ping the gateway and noone could log in. After several attempts to resolve this, including bringing in outside help, we where never able to figure out what the problem was.
Now 6 months later I have time to revisit the issue without effecting the live network. I used Acronis and imaged the AD server last Friday, cloned it on to another box with the same hardware, and put it up on the new network that's been sitting unused for the last 6 months. Today when I statically set the IP on the AD server (which is what I want) it connects and I can ping it's gateway 192.168.1.1 and all the way across vlans to a test sales agent workstation at 192.168.8.xxx on vlan 800 but only if I statically assign the agents station an IP address. When I try to get an IP address via DHCP it fails as destination unreachable. Nothing has changed in the last 6 months on the DHCP server but now it for some reason can't ping its default gateway 192.168.1.1. All of the config files are the same as they where left from the post linked above aside from the vlan id's used where changed from 1's to 100's (i.e. vlan 3 is now vlan 300) /etc/network/interfaces
Code:
auto lo
iface lo inet loopback
auto vlan100
iface vlan100 inet static
[code]....
why it can't reach the gateway, when I do a tcpdump I can see the DHCP requests come in on eth0 but the server never responds and I'm pretty sure its because it isn't "seeing" them since it thinks there isn't a network connection but I don't know how to trouble shoot to find out where the problem lies.
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Jul 1, 2010
Back in April I set up a Ubuntu DHCP server and a multiple VLAN network [URL] to migrate our various servers, workstations, etc off the 192.168.1.1 /24 network that everything was on because we where running out of address space. I built out the new network and everything worked great except our AD server would never get an IP address from the DHCP server (static reservation) and even if I set the IP statically on the AD server it couldn't ping the gateway and noone could log in. After several attempts to resolve this, including bringing in outside help, we where never able to figure out what the problem was.
Now 6 months later I have time to revisit the issue without effecting the live network. I used Acronis and imaged the AD server last Friday, cloned it on to another box with the same hardware, and put it up on the new network that's been sitting unused for the last 6 months. Today when I statically set the IP on the AD server (which is what I want) it connects and I can ping it's gateway 192.168.1.1 and all the way across vlans to a test sales agent workstation at 192.168.8.xxx on vlan 800 but only if I statically assign the agents station an IP address.
When I try to get an IP address via DHCP it fails as destination unreachable. Nothing has changed in the last 6 months on the DHCP server but now it for some reason can't ping its default gateway 192.168.1.1. All of the config files are the same as they where left from the post linked above aside from the vlan id's used where changed from 1's to 100's (i.e. vlan 3 is now vlan 300) /etc/network/interfaces
Code:
auto lo
iface lo inet loopback
auto vlan100
[code]....
why it can't reach the gateway, when I do a tcpdump I can see the DHCP requests come in on eth0 but the server never responds and I'm pretty sure its because it isn't "seeing" them since it thinks there isn't a network connection but I don't know how to trouble shoot to find out where the problem lies.
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Mar 8, 2010
Currently I have my eth0 interface getting a DHCP address but at times the DHCP server will not be reachable. Sooo what I would like my server to do is if it cannot find a DHCP server assign a static address to eth0. Then start the DHCP service so it can then dish out some addresses.How can I do this? Surely it is possible
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Aug 18, 2011
I get assigned an IP from the university's server. Every now and then, a student will plug in his router to the network trying to get wifi in his/her room.
And by doing so will start assigning IPs on the network, while rendering useless the university dhcp server, which has to cope with a higher number of pc's.
How can I specify to dhclient (or the linux system in general) NOT TO obtain IP addresses given by a specific mac address ?
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Aug 12, 2010
I had installed Ubuntu 10 to my desktop computer & I want to make it as DHCP server with Router, and use it for testing. I had installed dhcp server (apt-get install dhcp3-server) what should I do further? What file to edit?Also , I had 2 network cards, so I had to assign correctly the IPs & interfaces.
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Mar 25, 2010
I am puzzled with trying to configure a linux (openSUSE) client to dhcp to eBox DHCP server. I am using dhclient to lease an IP address with dhclient eth0 -s 10.45.48.108 and get a response
openSUSE11232CL1 dhclient: DHCPDISCOVER on eth0 to 10.45.48.108 port 67 interval 4
openSUSE11232CL1 dhclient: DHCPOFFER from 10.45.48.108
openSUSE11232CL1 dhclient: DHCPREQUEST on eth0 to 10.45.48.108 port 67
openSUSE11232CL1 dhclient: send_packet: Network is unreachable
openSUSE11232CL1 dhclient: send_packet: please consult README file regarding broadcast address.
The server reports eBox141 dhcpd: DHCPDISCOVER from 00:0c:29:3e:57:a3 (openSUSE11232CL1.domain.net) via eth0
eBox141 dhcpd: DHCPOFFER on 10.45.200.2 to 00:0c:29:3e:57:a3 (openSUSE11232CL1.domain.net) via eth0
I interpret this as the server receives the request and the client accepting it but the lease does not last long and the connection breaks. what this could be and why the connection breaks? Or my undestanding is totally wrong on how it works and should work? And BTW, where is that README file that's referenced in the message I receive on the client?
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Sep 30, 2010
The dhcp doesnt work unless i put a switch or router between the ubuntu gateway and the connecting computer.
setup
Code:
Code:
Code:
Code:
Im on ubuntu 10.04. is this normal? or should i be able to connect without having a router or switch between the ubuntu server and the internal network....
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Jan 6, 2010
I have Ubuntu 9.10 PC on my home network acting as a VPN gateway. It is using vpnc & iptables to provide access to the remote network - other computers on my local network have routing rules in place to go via the Ubuntu gateway if trying to reach an IP on the remote network. This works just fine, except DNS lookups for names on the remote network don't work.
I'm trying to solve this by using Bind9 on the gateway, so it can act as DNS for the local network. I don't want to create excess VPN traffic or load on the remote DNS, so I want the gateway to forward the lookup to my ISPs DNS first and if the name is not found then try the remote network DNS. Is this possible, or is there another (better) way around this? The Bind9 configs seem to admit multiple DNSs, but use them in a failover sense - only using secondary DNSs when the first one in the list is not reachable at all.
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Feb 15, 2010
I am using FC11. My problem is whatever application that needs access to the internet are blocked by company's proxy server. So, configuration is like
my_machine---------> firewall ----------> outside world..google and etc
Now, If I am using firefox then I have configured it to use proxy server and required login details and etc. But, my eclipse, ssh, git and all those needs internet connection as well... Is there anything like which sets all details (proxy server, user name and passwd) system wide ? So that I dont have to pass it to each application...
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Apr 3, 2011
ran an internet cafe and last week my windows server got fried because of power surge. Now i got Fedora 14 running on another PC and i want to set it up as a full caching proxy server, so other computers can connect through it to the internet. I have 2 network cards inside.I'm really new to Linux and now learning my way around. I managed to install squid but don't know how to configure it to suit the purpose above
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May 9, 2011
I want to configure DNS Server on Fedora14. So I install caching-nameserver cause any template files.I can't install caching-nameserver on my Fedora14 by this command: [but i can do it on Fedora5]
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Jul 23, 2011
installed dansguardian and now working fine.I got a small problem. People bypassing proxy settings in firefox, means they go to settings and changes proxy settings to no proxy.. how to prevent this? How can I force people to use proxy to connect Internet? I done some googling but, unable to find a solution.
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Apr 21, 2009
I have a lifttime premium account at Megaupload.com. Recently I found that megaupload has blocked all IPs in my area. I have sent emails to their tech but nothing has returned!!I have tried to use proxies to download stuff from megaupload, however, none of them works for suspected bandwidth reason, not to mention that it might be slow too.
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Apr 28, 2011
I am using squid 2.6 (as a proxy server) in my cent os 5 box.The clients computers are factehing the web pages successfully. The firewall (IPTABLES) are already disabled.The problem is we have an internal web based application by which the users add the data in it. when the user type the ip address in the browser i.e http://10.1.7.21:81/mis squid shows Code:ERRORThe requested URL could not be retrievedWhile trying to retrieve the URL: http://10.1.7.21:81/mis/The following error was encountered:Access Denied.Access control configuration prevents your request from being allowed at this time. Please contact your service provider if you feel this is incorrect.Your cache administrator is root.We have another proxy server MS ISA 2006 and by changing proxy from Linux squid to MS ISA we can access the page.
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Oct 7, 2010
An application that supports SOCKS 5 protocol can forward its network connection over ssh and dynamically forward to any host name that you specify isn't it ? that means firebox web browser can use SOCKS 5 protocol can be used by pass proxy settings isn't it ? so how can a sys admin remotely detect if a particular user is bypassing proxy settings using SOCKS 5 protocol ?
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Jan 30, 2009
I have Squid Version 3.0 PRE5 installed on debian etch.Howto exclude some URL from the proxy caching at squid.conf ?
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