Ubuntu Networking :: WLAN0 Will Do Reverse Dns Lookups But Not Forward
Jul 17, 2011
p, li { white-space: pre-wrap; } Laptop connects to a (wired) ethernet port on a DLINK DIR-625 wireless router using dhcp. All works perfectly.
Using the same laptop connecting to the same wireless router, but using the wireless adapter and dhcp instead of wired ethernet, I can ping IP addresses on the LAN and also WAN IP's to/from anywhere on the net. I can perform reverse name resolutions (ip to host name), but not forward lookups (host names to ip addresses). I can use the DNS server obtained from dhcp or specify, by ip address, a DNS server to perform the lookups. This makes no difference.
Web pages (LAN server pages or from the internet) are not accessible by site address name or by ip address specifically.
Kubuntu 11.01
$ uname -r
2.6.38-10-generic
$ iwconfig
[Code].....
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Jul 13, 2011
We have bind 9.3 running on CentOS 5.2. We are able to do reverse lookups for the public IP's but not able to resolve to the private IP's on our network.
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May 17, 2011
Im trying to learn BIND DNS! (yes im bored) Running Ubuntu Server 10.04 LTS.
What files to edit.
1) I want to add a A record for a machine
2) I want to forward none-discoverable lookups to another DNS server.
I found on google seems a bit harsh for me to understand.
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Mar 25, 2010
I have the zone record 0.16.271.in-addr.arpa which is working fine.
The NS for that zone is setup for my own name server.
I however would like to forward requests for 172.16.0.224/28 to another name server. How would I do this?
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Oct 8, 2010
We use a reverse proxy to forward a lot of websites via 1 central place.so hould forward to an internal server.I already managed to forward a lot of website correctly, except for this one:hen I type:ttp://blablahblah/smt/webtier-7-11 it doesn't work correctly, but How can I make the first url to work ?
ProxyPass /smt http://192.168.10.38:8080
ProxyPassReverse /smt http://192.168.10.38:8080
ProxyPassMatch ^/((smt|webtier-7.11)(/.*)?)?$ http://192.168.10.38:8080/$1
[code]....
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Jun 6, 2010
Also having this problem on Ubuntu 10.04.If I do "iwlist scan" I can pick up networks on wlan0:
Code:
lo Interface doesn't support scanning.
eth0 Interface doesn't support scanning.
[code]....
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May 20, 2009
When I try to bring up my wi-fi PCI card (ifup wlan0 or ifconfig wlan0 up) my whole PC just hangs until I power it off.
I believe I have the right drivers, but cannot see what I am doing wrong.
I'd really prefer not to go down the ndiswrapper route.
Firstly, I can see the PCI card and the driver it is using :
Code:
[J@gx260-f10 ~]$ lspci -k
...
...
01:08.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8185 IEEE 802.11a/b/g Wireless LAN Controller (rev 20)
[Code]....
the PC just hangs for ever. No mouse movement, ctrl-alt-del, nothing.
I have downloaded a Linux driver from Realtek but it will not compile. I have the latest kernel-devel, headers, and gcc. I can post compiler errors if anybody would like. They're all apparently to do with missing parameters.
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Jul 15, 2011
I work in IT, but networking is my weakest area.I'm getting very slow DNS lookups (60+ seconds with lots of page timeouts)in Firefox and Chromium on my Kubuntu laptop. Windows clients (xp and 7) work fine.
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Jul 9, 2011
I'm running Ubuntu 11.04 and I'm really new to linux. My problem is that whenever I try to browse a site I notice the website loads very slowly because it takes a long time to do lookups. I installed Ubuntu with an onboard NIC and later switched to a PCI NIC (Dlink DGE-530T). Although I disabled the onboard NIC in the BIOS, it doesn't help. Could this conflict in configuration be a problem? My download rates are fine, its just lookups that take really long ( upto ~ 10 seconds). I know the PCI network card is fine because when I jump to Windows 7, lookups are normal again (~ 300ms). At first I thought about installing the sk98lin drivers for the PCI NIC but I saw a couple of places where people have mentioned that the skge driver that comes along with the kernel is better.
I have tried a system wide as well as Firefox disable of IPv6. Here is my /etc/udev/rules.d/70-persistent-net.rules
Code:
# PCI device 0x1186:0x4b01 (skge)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:24:01:14:eb:39", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
# PCI device 0x10de:0x0373 (forcedeth)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:1e:8c:3e:19:ed", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"
The interface I want to use according to the listing above is the one with the MAC - 00:24:01:14:eb:39.
I tried removing one of the entries in the file above and rebooting but it still didn't work. Here is a look at my /etc/network/interfaces
Code:
auto lo
iface lo inet loopback
# The primary network interface
auto eth0
iface eth0 inet static
address 192.168.1.10
gateway 192.168.1.1
netmask 255.255.255.0
network 192.168.1.0
broadcast 192.168.1.255
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Oct 12, 2009
I am using RHEL5. These are my config files:
Code:
options {
listen-on port 53 { 127.0.0.1; 192.168.14.54; };
listen-on-v6 port 53 { ::1; };
directory "/var/named";
[code]....
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Feb 2, 2011
I want to be able to SSH into my computer that I can't expose port 22 on. I've tried the ssh -R ... several times, but can't manage to make it work.I have my home computer (want to SSH into), server (can SSH into), and some computer I want to SSH from.Do I need to install the sshd on the machine I want to SSH into? What are the commands I need to enter to forward from my server to my home computer?
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Jun 2, 2011
way to get nginx to perform DNS lookups at regular intervals against hostnames that are defined for upstream servers? It seems nginx only performs a DNS lookup once, the first time it starts, and subsequently does not perform any other DNS lookups. This causes problems when the ip addresses of our upstream servers change.
I posted this same question in the nginx forum; however I also posted it here as it seems that not many of the posts there get answered.
[URL]
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Apr 12, 2011
I have an odd issue with postfix 2.5.5 trying to relay email internally to a range of mail servers and it keeps ignoring the transport map [ ] and instead always doing mx lookups.
Essentially the server is only allowing connections from an internal network and only for certain domains that it will relay to other mail servers.
It has no local delivery and yet every time I get email passed to it, it will check the local network DNS server for MX information or with diable_dns_lookups enabled (as below) the A record for the domain, and try to deliver to that instead of the transport map destination.
Here's the main.cf
# See /usr/share/postfix/main.cf.dist for a commented, more complete version
smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)
biff = no
disable_dns_lookups = yes
# appending .domain is the MUA's job.
[Code]....
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Jun 14, 2010
Hardware:
Toshiba Satellite A505D-S6958
Wireless: Realtek 8192e
Ubuntu 10.04, x86
lspci
I was using ndsiwrapper with XP driver, but always prefer to Linux drivers if they are available. So, I emailed Realtek web support and they sent me latest drivers for Ubuntu 10.04. I followed their instructions and it works great! With, the exception of, I have to run ./wlan0up each time after I login to start the wireless.
I seem to remember having to modify a file some place, which was very easy to do, but for the life of me I cannot seem to remember what it was or what to put into it? and also, how do you tell if your wireless card is making use of the "n" speed, if the network your are on has it available?
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Jul 15, 2010
I have a wired connection going to my router, which is encrypted with WPA2-PSK. That works fine. I hooked up a WUSB54G v4 (Linksys USB Wireless Adapter), and used ndiswrapper to install the drivers from Vista to make it compatible with WPA2. Also configured the /etc/network/interfaces with the wpasupplicant lingo to make it all work. So if I do that, my eth0 will not work anymore. Also on a side note my network manager stops with displaying in the top panel. Not a problem I can run /etc/init.d/networking (re)start and dhclient eth0 (wlan0) and all the other commands that are necessary to make it work.
Back to the problem, so I hook up wlan0 with the settings and eth0 stops working. I want to use the wlan0 solely for the purpose of my media server. The eth0 is there for my internet and that is it .
How can I keep 'em separated?
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Nov 4, 2010
I recently upgraded to ubuntu 10.04 after not using linux on my PC for a few months. After the upgrade, everything worked fine except my wireless card no longer works. It seems to have disappeared from my available interfaces. Here's the output from lspci:
Code:
$ lspci | grep Wireless
04:00.0 Network controller: RaLink RT3092 Wireless 802.11n 2T/2R PCIe
...and iwconfig:
[Code]...
I've been through posts about similar problems that did fixes using things like blacklist and modprobe, but none of these worked. I've searched the RaLink webpages for more up to date linux drivers but found nothing that worked - I downloaded the RT3090_LinuxSTA_V2.3.1.6 driver and followed the instructions to try and build it, but this didn't work.
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Feb 21, 2011
I just installed Ubuntu 10.10 on a Sony VAIO VGN-NR110E.Literally, every other time I boot the wlan0 interface is missing. I saw that there used to be some problems with network manager in the past. My NM is running fine. When this happensCode:sudo ifconfig wlan0 upreturns:wlan0: ERROR while getting interface flags: No such deviceIf I reboot the wlan0 comes back up
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Mar 23, 2011
I'm running Ubuntu Server 10.10 on a 64 bit laptop (also have GNOME installed just for convenience), and have a website up using apache2. I am wondering if it is possible to configure both eth0 and wlan0 to the same local static IP address? I would like to walk around my house and do stuff when I want and still have the website accessible, but also be able to jack my laptop back into the router when I am away, just for peace of mind.
Is this possible? If it is, do I need to do some configuring in apache2 to tell it to use another device? Is this even a smart way to get what I want done?
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Apr 4, 2011
I have an Ubuntu server installed at home, on an older machine. Unfortunately I am to far from my router to run cat5 and solve this issue. But I want to be able to have the wireless come up if the server restarts as then i could log in remotely.
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Jun 11, 2011
I removed my b43xx driver and installed ndiswrapper using this guide. It worked fine, but after a reboot wlan0 was gone:
Code:
iwconfig
lo no wireless extensions.
eth0 no wireless extensions.
It's installed:
Code:
sudo ndiswrapper -l
bcmwl5a : driver installed
device (14E4:4318) present (alternate driver: ssb)
and loaded:
Code:
lsmod | grep ndiswrapper
ndiswrapper 192828 0
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Jan 31, 2010
so i start it with ssh -f -R 4096:localhost:22 me@server.com and it comes up and someone can log in at the remote end. how do i close the tunnel from the initiating end ? netstat doesnt seem to identify my end of the tunnel , unless im looking for the wrong thing!
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Oct 3, 2010
I am currently running 64-bit Windows 7 from my home laptop and I would like to establish an SSH reverse tunnel to my laptop from my work Ubuntu 64-bit machine. I have been reading many "tutorials" that have led me nowhere and I feel as though I'm chasing my tail now. I have done the following on my Ubuntu machine:
Code:
ssh -R 19999:localhost:22 laptop_ip
and on my Windows machine, using putty, did the following:
Code:
Host Name: host_IP
[Code]...
I am able to access my Ubuntu machine when on my work network but there I have been unsuccessful when it comes to trying to remotely access it. I have tried everything that I can think of (though I am a novice). If there is any help/suggestions/ideas that could help, please let me know and don't hesitate to ask for more info!
p.s. I would also like to enable x-forwarding, but for now I would like to have remote access to the Ubuntu machine.
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Feb 28, 2009
how to set reverse dns for my IP? I've configured bind with a reverse dns for my IP, but it doesn't work when I test it.
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Sep 12, 2010
I have a domain and the settings for it are pointed at my IP address. But when I look up my IP address, it does not show my domain as the hostname. What settings do I have to change to make my IP translate into my domain as the hostname?
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Feb 4, 2010
Recently, I've set up Ubuntu Server 9.10 x86_64 (no GUI). I have two NIC cards in this machine. One is a wireless card that I would like to set a static IP address to. The other is an integrated NIC. Everything works just fine when I have everything set up under DHCP. I can ping both NIC cards with no issues. But as soon as I change over to a static setting, things work unexpectedly...
Things to keep in mind:
-All machines are running under the same subnet
-All machines are connected to a wireless router (freshly flashed with the latest firmware)
-This is a fresh install of Ubuntu Server 9.10 x86_64
--Static IP address on the WIRED (eth0) NIC works great. No issues. Can ping from my wireless laptop, and can ping from the machine to the outside world (ping google.com) as well as the gateway itself with excellent response times.
If I then turn on the WIRESLESS (wlan0) NIC after setting up a static address for it in /etc/network/interfaces, then turning the wlan0 on by issuing "sudo ifconfig wlan0 up", wlan0 shows up, but does not have an IP address associated with it, even though I set it up as static. I also cannot ping wlan0 from my laptop. I assumed that was because I needed to restart the networking service. So after issuing "sudo /etc/init.d/networking restart", I am able to ping wlan0 from my laptop with no issues.
Here is where things get strange. Lets say that I physically pull the plug on eth0. After dong this, wlan0 stops responding to the ping request that was initiated by my laptop at the same exact time. If I plug the cable back in, both eth0 and wlan0 begin to respond once again. But soon after I try to SSH to wlan0, wlan0 decides that it no longer wants to respond to the ping. I should note that it does ask me for a username and a password, but after I entered my password, the ping stops responding. Why should the wlan0 be affected in any way if something happens to eth0?
This all started when I set the server up with only a static configuration on wlan0. It appeared to be working well. I was able to ping the machine from my laptop as well as SSH into the machine. I went to bed and the next morning, I was no longer able to ping the machine. I let the ping run for a small amount of time with a few responses here and there. Then after a little more time of letting ping run, it tends to respond. Almost like I bothered it enough to decide that it was appropriate to start working again.
Ideally, I would like to have ONLY a wireless connection. But if I need to have eth0 up, it would be great to have option work as well. Bottom line is that my wireless is flukey. And I would like to find out why.
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May 19, 2010
I've looked everywhere and tried everything. All I want to do is set up a static ip with my wireless network interface wlan0.
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Dec 10, 2010
I'm running Linux Mint 10 . I have a wireless PCMCIA card (Linksys WPC 11 ver.3) that I've put into master mode, and I'm trying to set up my laptop as a wireless hotspot. I am very confident that I want to do this and have no interest in using a wireless router....I say that because that topic inevitably comes up with posts like this. The problem I'm having is I don't understand how to get wlan0 and eth0 to "talk" to each other...That is, I don't know how to set it up so that traffic from wlan0 goes through eth0, so that devices that connect to my hotspot can access the internet.I've seen a few guides about this, but they were either much broader in scope (i.e. much more complex), or for other distributions, etc, and it's too much for me to follow as a linux .
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Apr 1, 2011
I have a strange issue that I cannot put my finger on. Recently,I installed a new Ubuntu 10.04 server. No extra software yet, apart from openssh-server. The wired connection (eth1) works fine. I then added a wireless card with chipset p54pci, which appears to work with the wext driver. Configured /etc/wpa_supplicant, and /etc/network/interfaces as well:
This is wpa_supplicant:
Code:
This is interfaces:
Code:
After a reboot the machine comes up with both NICs active.
If I do a ssh from another Ubuntu machine to this machine (to 192.168.2.100, so the wired address) it takes about 30 seconds before I get the login as: prompt.
If I change the interfaces file so that wlan0 is not started (I comment out the line auto wlan0, and reboot), connecting from another machine with ssh alsmost instantly gives me te login prompt.
I tried switching the order of both NICs in the interfaces file. Also tried changing the sshd config file so that it only listens on the wired ip address. Both did not help.
Does anyone have a clue why logging in with ssh from another machine is very much slower in response with wlan0 activated than without ?
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Jul 24, 2011
I have a laptop with Ubuntu 11.04. Failed to connect my home wireless network, which is composed of a modem and a Netgear router.
ifconfig showing:
wlan0 Link encap:Ethernet HWaddr 00:24:d6:07:2b:a2
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:30238 errors:0 dropped:0 overruns:0 frame:0
TX packets:24005 errors:0 dropped:0 overruns:0 carrier:0
[Code]....
I do not quite understand how the virtual interface wlan0:avahi appeared. My guess was, my request "sudo dhclient wlan0" failed to get a valid ip, although I did not get any error message from running that command. I executed "sudo dhclient wlan0" again, but still no error message or network connection.
Later today, I tried to connect to a public wireless network. Still got the same error. But when I reboot my machine, no such problems.
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Jul 29, 2011
change my WLAN0 MAC address in my Kubuntu Natty 64 bit at every boot. I have done quite a bit of searching and found some procedures that appear to have worked back in 9.04 and before days but I have been unable to get anything to work for me in my 11.04 install. I have tried adding a script to if.pre-up.d and also tried adding a bootmisc.sh and either I did them wrong or they are not working. I want to make sure that every time I bring the wireless up in Kubuntu that I have the changed MAC address. I usually keep wireless disabled and turn it on just when I need it.
Background so you don't think I am doing something nefarious... I am going on a cruise soon. The cruise line sells wireless internet subscriptions for the duration of the cruise but they tie it to a MAC address. I am bringing my CDMA android phone that unless I use VOIP will be unable to call at all or at least with very high charges. But I also want to be able to browse the internet with my laptop. I figure it will be easier to spoof my phones MAC with the PC than the other way around. I just need to turn one device off if I am using the other. I need the MAC address to be semi permanent so I don't turn it on by mistake and have forgotten to change the MAC.
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