General :: Reverse DNS Lookup From A File?
Oct 4, 2009
I have a file consisting of unique IP addresses - one per line I want to find the name of the host for each address. I tried the following:
Quote:
nslookup < file_name
This worked except it gives me a lot of extraneous information such as the servers providing the answers. This is too much information for me and would simply like each line of IP numbers to be replaced with a domain name. I tried using the same strategy using host and hostname and dig but I must have given the wrong command as I had no results.
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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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Sep 27, 2009
Reverse dns lookup in C?
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Oct 23, 2009
I have the following bind9 configuration, and I'm trying to resolve reverse lookup IP address to name.
$ttl 38400
mydomain.org.INSOAmyhosting.com. (
1243281304
10800
[code]...
** server can't find 1.2.3.4.in-addr.arpa: NXDOMAIN
Is my PTR wrong, or what do I need to have the reverse lookup working ?
Note: I replace real IP by 1.2.3.4, same for my domain name.
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Jun 3, 2011
I've got 2 domains:
[URL]
This is how I've configured my resolv.conf file:
[URL]
When I run the host command, it can resolve machines in one.domain.com using both hostname and ipaddress. But when I run the host command for machines in two.domain.com, it only works for hostnames but not ip addresses. The result for ip addresses is:
Host 100.3.2.1.in-addr.arpa not found: 3(NXDOMAIN)
Why doesn't it try the 2nd nameserver in the resolv.conf file when resolving by ip adddress? Reverse pointers are configured for each machine in their respective domain dns servers. O/S is Oracle VM Server 2.2.1 (similar to Red Hat). Kernel is 2.6.18-128.2.1.4.37.el5xen.
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Apr 6, 2010
Like many others I'm running into some reverse lookup issues with SSH. Setup is as follows:
localnet setup
myserver - 192.168.0.x
myworkstation - 192.168.0.y
[Code].....
nslookup tests show that my reverse lookup is functioning correctly. However, if I use "myworkstation" to connect to myserver.mydomain.com using an external nameserver SSH says: "Address 84.162.xx.yy maps to myserver.mydomain.com, but this does not map back to the address - POSSIBLE BREAK-IN ATTEMPT!"
On myserver the /etc/hosts has the internal address for the server which seems the normal way to go to me. Changing this to the servers external address solves the issue.
Apparently a connection originating from myworkstation arrives from/with my external address, and when its reverse is checked by the server it apparently finds its own internal address for that name in /etc/hosts before doing a nameserver query and thus concludes that internaladdress <> externaladdress which gives the error.
Is there any way to have the server check external DNS before /etc/hosts? Another solution would probably be running an internal DNS, so myworkstation doesn't connect through the 'outside'.
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Apr 1, 2011
I'm at a loss to why my reverse lookup zone doesn't work for me.I've got two views. One internal and one external. My domain is isp2.datornatverk.se. Public IP: 130.240.133.81.
dig -x @8.8.8.8 130.240.133.81
gives me:
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 2917
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
I've set it up so that the internal subnets gets the domains resolved to the internal IP-addresses. When querying from external addresses I will get public IP.My named.conf.local file:
Code:
acl internals {
127.0.0.0/8;[code]..........
I don't know whether the views has messed something up. It worked before I added the views.
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Jan 12, 2011
The scenario: We have an external server that runs HTTP/DB servers for out shop system. Then, there's our local, in-house infrastructure that runs a.. yeah... Exchange 2010. The shop system on the external server needs to send mails to customers (order confirmations, invoices, etc.). seing as sending them directly through the local MTA (Postfix) would cause mail delivery problems because of reverse DNS issues, i've set the Postfix MTA to act as a satellite to our in-house Exchange Server, so the Exchange sends the mail instead, giving recipient mail servers a valid reverse DNS lookup.
Now, mails sent by the (proprietary, uneditable) shop system are relayed correctly and sent to the target e-mail address. My problem is: Mails not sent by the shop system, but by our own PHP scripts which run on that same external servers, are NOT relayed properly. So the Exchange is fine with the mails sent by the shop system, but not the mails sent by our scripts. This is what i get in the mail.log: The successfully relayed mail sent by the shop system:
[Code]....
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Apr 26, 2010
I got this message on Friday from just one domain. uote:mailsrv.forthnet.gr #<mailsrv.forthnet.gr #5.5.0 smtp; 554 5.5.0 Your message was considered to be spam by the FORTHnet Antispamming Policy and was not delivered to the recipient. The following spam tests returned positive for this message:FORGED_RCVD_HELO,RCVD_IN_BRBL. For further information visitWe are not a spamming community but it seems we have a statice IP address that has a Reverse lookup to "myipaddress.static.lyse.net" and not my email domain. Would setting a cname mail.mydomain.no -> myipaddress.static.lyse.net cure this problem or are there more tricks to be performedOnce I have cured the FORGED_RCVD_HELO I can move to getting the IP removed from BARACUDA.
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Dec 17, 2010
Write a program in any language you choose, to reverse a file.
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Apr 28, 2011
When emacs freezes doing a DNS lookup, that makes it rather hard to fix a network configuration file. Why does it need to do that?
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May 26, 2011
I am running fully updated ubuntu 10.10 and now, since 2 days ago, when I open a file
in open office, gimp or gedit etc the directories and files now appear in reverse alphabetical order.
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Jun 28, 2011
Linux Mint Debian Edition x64 is installed and running quite nicely. But as most 64bit users know, you have to take care of the 32bit libraries in order to run alot of software....well, only if you need to run 32bit software.
So, in practice, the first steps are to install ia32-libs and ia32-libs-gtk. That's the foundation. But sometimes that isn't enough....so, depending on your application, you have to discover it's dependencies....via 'ldd'.
For whichever libraries are required, I head over to the Debian 'testing' respository (which LMDE is based off) and search. So after satisfying the dependencies it should be good....take the following as example:
Code:
xxx@xxx ~/Floola $ ldd Floola
linux-gate.so.1 => (0xf772b000)
libgtk-x11-2.0.so.0 => /usr/lib32/libgtk-x11-2.0.so.0 (0xf732e000)
libgdk-x11-2.0.so.0 => /usr/lib32/libgdk-x11-2.0.so.0 (0xf7293000)
code....
However, when trying to run the program the following error occurs:
Code:
xxx@xxx ~/Floola $ ./Floola
./Floola: symbol lookup error: /usr/lib32/libgobject-2.0.so.0: undefined symbol: g_date_time_unref
So from some research, this indicates an issue with a date stamp/version conflict...if this is incorrect, ...this is part of the learning process.
Anyway, this error occurs with other 32bit software i'm trying to run.
The strange thing, though, is that i've done a fresh install of LMDE and ran the same process of setting up the 32bit libs as I did before....but this time I get this error.
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Oct 19, 2010
I install a Bind 9 with chroot in Centos 5, but the issue is the Reverse Name Resolution Zone File didn't create by default like other zone files, so i look into /var/named directory i don't find the reverse name resolution zone file even if i add this zone on named.conf
zone "1.168.192.in-addr.arpa" IN {
type master;
file "1.168.192.testsip.com.zone";
allow-update { key "rndckey"; };
notify yes;
};
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Apr 25, 2011
Up front: the per browser (or per process, if you will) part is the important part here. I'm well aware of the /etc/hosts(and its Windows counterpart), but would like to avoid this system-global method.
What tools exist to override the IP for a given (i.e. configurable) name per browser? For Firefox there are "Modify Headers" and "Tamper Data". Both of them do not appear to be suitable for my case, because the DNS lookup is done before that. So I can only modify the HTTP headers (e.g. the Host header), but not influence the IP to which it gets sent. But manipulating to what IP it gets sent is exactly what I want to do.
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Jan 28, 2011
where are the interface configurations (set by ifconfig, not the static ones) stored? I'm asking because I'm trying to understand, more broadly, the order of IP address lookup. If I ping the local machine (localhost, or one of the interfaces) no messages get sent out (at least according to wireshark), so some local lookup must be taking place.
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Apr 1, 2011
It seems my laptop (an Acer Aspire One AOA150) runs out of MTRRs at boot. I've done some googling on the problem and read that people recommend turning on MTRR sanitizing to fix it, however, it still occurs. I'm running Arch Linux (but that shouldn't matter). You can see that I have enabled MTRR sanitization here:
[chris@helios ~]$ zgrep 'SANITIZER' /proc/config.gz
CONFIG_MTRR_SANITIZER=y
CONFIG_MTRR_SANITIZER_ENABLE_DEFAULT=1
CONFIG_MTRR_SANITIZER_SPARE_REG_NR_DEFAULT=1
Here is my relevant system info:
uname -a:
Linux helios 2.6.38-aao-light #1 SMP PREEMPT Fri Apr 1 03:02:37 BST 2011 i686 Intel(R) Atom(TM) CPU N270 @ 1.60GHz GenuineIntel GNU/Linux
dmesg potential warnings:
[ 0.000000] Notice: NX (Execute Disable) protection missing in CPU!
[ 0.000000] RCU-based detection of stalled CPUs is disabled.
[ 0.000000] Verbose stalled-CPUs detection is disabled.
[ 0.157222] ACPI Error: [CAPB] Namespace lookup failure, AE_ALREADY_EXISTS (20110112/dsfield-143)
[code]....
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Mar 14, 2009
Mandriva 2009, BIND 9.5.0-P2. Named will start however I'm getting the above error as well as these:
14-Mar-2009 15:45:37.084 general: error: zone 0.in-addr.arpa/IN: loading from master file /var/lib/named/var/named/reverse/named.zero failed: file not found
14-Mar-2009 15:45:37.084 general: error: zone 0.0.127.in-addr.arpa/IN: loading from master file /var/lib/named/var/named/reverse/named.local failed: file not found
[code].....
Named shows to be running but with the errors above I know it's not running correctly. I also copied the above dir's over to /var/lib/named/var/lib/named which is where I 'believe' it's chroot'd at, though I could be wrong since I'm unfamiliar with chroot.
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May 16, 2011
The touch screen works but when I touch the top it goes to the bottom. Touch left it goes right. How can I reverse the action?
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Jun 9, 2010
how would the syntax of reverse find be..i want to type a name and then find it and delete it from a file i have?
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Jul 12, 2011
I have a html page and I would like to search for the occurance of a given string as an anchor. Then I would like to search backward for a the first match to a given regular expression. As a result I would like to output the text between the two points.
Please note that I would like to have the output up to the first regex match before the ANCHOR point.What is the best tool to solve this?
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Jun 28, 2011
So unfortunately I live in a place that will not let me have a static IP, so I have been setting up access to my home computer via reverse SSH tunnels that run on an micro amazon ec2 instance. I have gotten SSH to work fine, but I cannot figure out port forwards.Here is a small infographic I made to help illustrate (i felt the question was clearer with a diagram of what I was trying to do. Here are the commands listed in the graphic:I the following on my home computer: ssh -R 1337:localhost:22 -i .ssh/tokyoMinekey.pem ec2-user@ec2serveraddressand I run this on the ec2 server: ssh -L6600:localhost:6600 -Nf localhost -p 1337
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Jun 21, 2011
I have a question regarding the possibility of streaming video using an Apache web server configured as a reverse proxy. Suppose I have a local web server and areverse proxy that is abroad. I want users that are nearer the reverse proxy to be served by it and not my local web server. I know in general how to configure this and there is a lot of documentation. But can it be configured to support video file streaming without saving all the media content in the reverse proxy disk?
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Jan 31, 2010
The full screen console is brought up by ctrl+alt+F1. How do you get back to the windows display manager? Is it necessary to reboot?I am running Ubuntu 9.10 with Gnome.
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Sep 7, 2010
I've been comparing the current Slackware 32 bit versus 64 bit, and I've noticed that the 64 bit version is as slow as dialup for domain name lookup.
The 32 bit version is very fast to find websites after a mouse click, whereas the 64 bit version takes forever looking up URLs. (using Firefox)
All the other 64 bit Linuxes seem to be the same way, not just Slackware.
The /etc/resolve.conf file is the same for 32 or 64 bit Slackware, but something is not right. The 32 bit version has a /etc/dhcpc directory, but not the 64 bit version.
Could this be causing the extreme slowdown?
It's really very irritating when the rest of the system is blazing fast.
AMD Phenom II X4 955
Asus M4A88TD-V
8 GB Corsair XM33 ram
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Jul 30, 2010
I have a problem in Eclipse for accessing update sites (for plugins). I am behind a NTLM proxy. Strangely, this proxy asks for a password while in Linux but not when in Windows�
To get around this annoying password issue, I already setup a working cntlmd proxy. I can use this proxy for mounting a remote DavFS2 share, for example. But the issue I have with Eclipse seems to involve proxy configuration. So I decided a transparent proxy could solve this issue. I installed tinyproxy on top of cntlmd, and added the following rule to the firewall:
Code:
iptables -t nat -A OUTPUT -p tcp --dport 80 -j REDIRECT --to 8888
Now, I can configure Firefox for direct access to the Internet, and display a web site only if I give this web site's IP instead of its name! I surmise that it's because when configured for direct access, Firefox performs DNS lookups using the local (intranet) DNS, instead of squeezing its lookups through the proxy and accessing a broader DNS (I wonder which). How can I make all DNS lookups go transparently through the transparent proxy?
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Mar 31, 2010
I've been cracking on with getting a new Slackware 13 x64 installation going. I've got a problem with browsing the net which I can't put my finger on.
When I try to access a site my machine spends a long time with the "Looking up www.website.com" message at the bottom. It can take 7-12 seconds before the site is found. Normally I would blame this on my ISP or connection but Mint, Debian and Windows XP aren't having this problem, they just zip straight to the site whether I've been to it before or not.
Is anybody aware of where the problem might be? It's not in the browser either because Opera, Seamonkey and Firefox all have the same problem issue.
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Jun 17, 2010
Pidgin won't start for me any more. Upon execution from the command line, this is the output:
pidgin: symbol lookup error: /usr/lib/python2.6/site-packages/gst-0.10/gst/interfaces.so: undefined symbol: gst_stream_volume_format_get_type
I've run sudo /sbin/ldconfig, but it didn't help. I've also reinstalled pidgin and libpurple.
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Nov 18, 2010
I get the following error message starting k3b:
frank@linux-avnb:~> k3b
k3b: symbol lookup error: /usr/lib/libkcddb.so.4: undefined symbol: _ZN9QListData11detach_growEPii
<unknown program name>(26884)/: Communication problem with "k3b" , it probably crashed.
Error message was: "org.freedesktop.DBus.Error.NoReply" :
" "Message did not receive a reply (timeout by message bus)" "
frank@linux-avnb:~>
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Jan 8, 2010
I can lookup DNS hostnames with dig and nslookup, but nothing else seems to be able to resolve anything. ping, telnet, Firefox, everything gets "unknown host".
For example:
> dig yahoo.com
; <<>> DiG 9.6.1-P2 <<>> yahoo.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 20438
;; flags: qr rd ra; QUERY: 1, ANSWER: 3, AUTHORITY: 13, ADDITIONAL: 0
;; QUESTION SECTION:
;yahoo.com.INA
;; ANSWER SECTION:
yahoo.com.17579INA209.131.36.159
yahoo.com.17579INA209.191.93.53
yahoo.com.17579INA69.147.114.224
;; AUTHORITY SECTION:
.10071INNSL.ROOT-SERVERS.NET.
.10071INNSI.ROOT-SERVERS.NET.
.10071INNSH.ROOT-SERVERS.NET.
.10071INNSF.ROOT-SERVERS.NET .....
> ping yahoo.com
ping: unknown host yahoo.com
> ping 209.131.36.159
PING 209.131.36.159 (209.131.36.159) 56(84) bytes of data.
64 bytes from 209.131.36.159: icmp_seq=1 ttl=55 time=97.2 ms
64 bytes from 209.131.36.159: icmp_seq=2 ttl=55 time=98.9 ms
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