Fedora Networking :: DNS Queries - Connect To A Ssh Server ?
Aug 28, 2011
How often are dns queries sent? Assume I want to connect to a ssh server, will I send one dns-query in order to do that or do I send multiple during my connection? What if I request web-pages, do I send a query only when I enter a site or will I send queries every time I visit a new page on that site?
I'm asking since I'm considering getting an account at dyn.com (the standard account for $30/yr) and it comes with 600 000 queries per month (which is way more than I expect to get but knowing exactly what it means is always good).
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Jul 5, 2011
I would like configure a DNS server on Debian, only to forward through my ISP DNS servers.
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Mar 4, 2011
I am bit new to Linux and have setup caching-only name server with Centos 5.5. when i do dig server, it provide resolutions. but when i use the server IP as DNS on my windows client, it says, "connection refused" on the NSlookup output. (IP table didn't enable) My server Ip is 192.168.1.253 and bellow is the configuration of "/var/named/chroot/etc/named.conf"
options {
listen-on port 53 { 127.0.0.1; 192.168.1.253; };
listen-on-v6 port 53 { ::1; };
directory "/var/named";
dump-file "/var/named/data/cache_dump.db";
statistics-file "/var/named/data/named_stats.txt";
memstatistics-file "/var/named/data/named_mem_stats.txt"; .....
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May 14, 2010
I recently turned on query logging on our name server and immediately saw repeated queries for . (dot). I've not seen this before. It looks like a really sloppy DOS. What would this return if my NS was misconfigured?
May 13 18:11:41.710 queries: info: client 91.202.63.129#56089: query: . IN NS
May 13 18:11:42.083 queries: info: client 91.202.63.129#62826: query: . IN NS
May 13 18:11:42.788 queries: info: client 91.202.63.129#13620: query: . IN NS
[code]....
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Apr 21, 2010
I have this ISP grade Nameserver running on BIND 9.5 on Fedora Core 9 64 Bit.
Its been pretty working well for sometime until a last week when we noticed it stopped resolving for our clients using on our service.
It gives correct authouritative answers for our own ISP domain with the A, PTR and MX intact but does not return resolving queries back to clients.
Below are my files
This is the message from /var/log/messages
The 41.223.x.x and 41.215.x.x ip address are from our ISP subnet and so are our own clients being denied.
The box is also hosting our traffic graph server which is on a LAMP but listens on another IP/ethernet card.
So far the load on the server is minimal as is a Dell R200 rack server.
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Feb 15, 2010
I am currently running the latest version of Bind, and for some completely unknown reason I can NOT get queries to work for PTR records. All queries to the servers for reverse name lookup get query denied:
Using domain server:
Name: 66.150.173.1
Address: 66.150.173.1#53
Aliases:
Host 27.173.150.66.in-addr.arpa not found: 5(REFUSED)
And it shows in my logs:
I am at my wits ends with the piece of crap. Can anyone shine some light on why this damn Bind install won't respond to these queries?
For reference here is my named.conf:
Code:
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Feb 23, 2010
My DNS server used to work flawlessly but for some reason it no longer responds to queries. It seems that named always queries internet root serves!!
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Nov 7, 2010
I have internal-only email server that has internal BIND9 running. Thought it only has its IP address defined in /etc/resolv.conf, it is still resolving outside addresses.
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Mar 7, 2010
i want to share my problem that after updating fedora 12 by my mobile broadband. mobile broadband connection stopped working. i mean now it can't connect to the server.
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Jan 9, 2009
Is there a way to run queries against a Microsoft sql server from linux? Here is what I would like to do. When I create apps that us db back end I would like to quickly check results of my queries. so if I could do something like "select * form Orders" from the terminal or another app that would be great.
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Feb 24, 2011
I have my bind9 DNS server running on Ubuntu with logging on. What's bothering me is that I have log full of localhost queries instead of from IP of the computer which actually asked.DNS queries log:/var/log/named.queries.log
Code:
24-Feb-2011 16:01:19.413 client 127.0.0.1#38022: query: clients4.google.com IN A + (127.0.0.1)
[code]....
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May 8, 2010
I've got a FC PPTP server up and running but can't connect to it using VPN. I'm using NetworkManager but the connection fails each time. On the server, I'm seeing the following in the /var/log/messages:
Quote:
May 8 16:37:05 li99-23 pppd[2113]: Plugin /usr/lib/pptpd/pptpd-logwtmp.so is for pppd version 2.4.3, this is 2.4.4
May 8 16:37:05 li99-23 pptpd[2112]: GRE: read(fd=6,buffer=8059780,len=8196) from PTY failed: status = -1 error = Input/output error, usually caused by unexpected termination of pppd, check option syntax and pppd logs
[Code].....
Ive checked that the name,passwords all match, which they do. Has anybody seen this before ?
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May 17, 2010
I recently wanted to connect to a vpn server which its tunnelling mode is L2TP.how I can configure my FC 12 to connect to this vpn server?I mean in which files I should enter that server's IP and my username and password.
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Jun 4, 2010
I chose -Server-, if this is more appropriate in -Networking-, just let me know. Basically, I need to be able to merge responses stored in a zone file with responses from an "upstream" authoritative server. I'm in the sad position of needing to "intercept" requests to *part* of a domain (but not restricted to a sub-domain!) and return results for *some* hosts that use an internally routed address, and results for the rest using the public internet addresses. Unfortunately, it's not my domain, so I can't just use views (although I suspect they could end up having some part to play in this, at least potentially)... but instead I have to actually send requests recursing to the other site's external DNS for any hosts my server doesn't have records for in the zone file.
Some background on the situation:
I work at a local government, which has a private link / VPN connection to a state government entity, and needs to use internal addresses for some of the state servers, which then get routed over an "internal" network link. But the state uses the same domain name internally and externally, just presenting views to internal clients vs. external clients. -- However, we are only being allowed access to certain of their servers through the internal link, which means that for any other servers that we don't have internal/private access for, we have to visit the public addresses just like anyone else on the internet... So, I can't just send all requests to their internal DNS and get responses, because we'd get IPs for some servers (e.g. their main web site) that we wouldn't then be able to reach using the internal network link.
For Example: Say I have a client machine, "client1", on my network ("my.net"), which uses "mydns1.my.net" for name resolution ... and which needs to access 2 servers on the state network, "private.st.us" and "public.st.us" -- so named based on how "my.net" needs to access them.
The external state DNS server/view ("ext-dns.st.us") responds to requests with something like:
private.st.us -- 1.2.3.456
public.st.us -- 1.2.3.457
(Those are just crap addresses, obviously.
The internal state DNS server/view ("int-dns.st.us") responds to requests with something like:
private.st.us -- 10.0.0.8
public.st.us -- 10.0.0.10
This works on their network because their own clients have access to all such IPs.
But for us, they only allow traffic flowing between "my.net" and their internal network to reach the 10.0.0.8 address, blocking all other address destinations. So, when "client1.my.net" asks "mydns1.my.net" for the address of "public.st.us", I need "mydns1" to recurse out to "ext-dns.st.us" to get an answer (1.2.3.457) and then return that IP to "client1" -- because "my.net" is blocked from accessing the server's 10.0.0.10 address. But, when client1 asks mydns1 for "private.st.us" I need to pull the IP (10.0.0.8) from a local zone file instead of asking either of the state DNS servers -- or optionally forward the request to "int-dns.st.us" I suppose -- because the state blocks access to certain services (which we need and are the whole cause of this problem!) via the public (1.2.3.456) address.
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Feb 14, 2011
I can configure a caching-only name server fine, but how do I make it forward DNS queries too?
I'm thinking I could add the below to the options stanza in the /etc/named.conf file:
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Jun 3, 2009
I succeeded in setting up a vnc server on a fedpra9 tested it locally and it was successfully connected but no connection done from other machine in the network , even though they can see each othervnc server is pingable se linux is disabled
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Dec 10, 2010
is there an Xwindows client to connect to my FC14 server to manage it? Like not Xindows on the server but on a windows machine. Are there other, better ways to manage it?
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Jan 6, 2011
I have been trying to connect to my University's VPN Server and for some reason vpnc fails. I have configured the vpn settings the same way I did for the past two years. They worked properly on Fedora 12 and 13, but for some reason fails on Fedora 14.
Code:
Jan 6 16:45:20 exodusprime NetworkManager[1269]: <info> Starting VPN service 'vpnc'...
Jan 6 16:45:20 exodusprime NetworkManager[1269]: <info> VPN service 'vpnc' started (org.freedesktop.NetworkManager.vpnc), PID 11731
Jan 6 16:45:20 exodusprime NetworkManager[1269]: <info> VPN service 'vpnc' appeared; activating connections
Jan 6 16:45:21 exodusprime NetworkManager[1269]: <info> VPN plugin state changed: 3
Jan 6 16:45:21 exodusprime NetworkManager[1269]: <info> VPN connection 'Swinburne University VPN' (Connect) reply received.
code....
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Sep 5, 2010
trying to configure a Centos 5.5 server (simple file server with DHCP and DNS relay). I configured and tested the config (by 'service dnsmasq configtest') of dnsmasq and I got the message 'dnsdomain:host unknown (translation of the real message : hte inconnu) and I didn't find where I could define this host ! The hostname of the server is well defined and I can see it from all Windows PC's on the LAN. dnsmasq starts (with hte same message as in configtest) but when querying DNS from PC's te.g. trying to surf the Internet), I don't get replies (3 DNS servers are also well defined and operational).
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Jul 6, 2011
I set up a routed OpenVPN server. Everything works fine. But I'd like to route the DNS queries thru the tunnel too. So I added:
[Code]....
Can't find server name for address 10.8.0.1: Non-existent domain Even thou I have a DNS server set up correctly (on the same server as the VPN) with recursion. I verified that by sending queries form external source, which worked fine. I suspect that the Bind server doesn't listen to the tun0-interface only eth0, but the Bind manual says it should listen to all interfaces by default. The server log shows:
Code:
named[9639]: client 10.8.0.10#3807: RFC 1918 response from Internet for 1.0.8.10.in-addr.arpa
How do I get these DNS queries to resolve thru the tunnel?
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Jul 19, 2010
I have registered 2 nameservers running bind for a certain domain. The log file of my domain name provider (SWITCH) shows the following warning:
Warning Der Name-Server ns.xxxxx.ch (nn.nn.nn.nn) beantwortet rekursive Anfragen.
In English that would be:
Warning: Name-Server ns.xxxxx.ch (nn.nn.nn.nn) answers recursive queries.
The NS triggering the warning is running openSUSE 10.2 and the other one 11.1. Both configuration files /etc/named.conf are equivalent (well, forwarders are different). There is no such warning for the NS with 11.1. When I add "recursion no;" to the options in /etc/named.conf the warning goes away, but FF or SeaMonkey running on the server no longer get their DNS requests resolved.
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Apr 27, 2010
I got a mission to move our company's ns3 from one machine to another.I've installed the djbdns software on other machine, configured it(or at least I think soand if I make a "nslookup www.google.com 195.222.14.7" query from that paticular server then I get an answer straight away, but if i make the same query from local machine i get connection timed out
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Mar 8, 2010
I have installed BIND 9.6.1-P3-RedHat-9.6.1-16.P3.fc12 on Fedora Core 12.
I found out that when i perform i DNS lookup to a some record that is not in the DNS cache or zones(means...recursive) it takes about 4 sec to give the IP results.
I dig a little bit on the internet and found out that it is a known issue but all places says that it is fixed on newer version of BIND (after version 9.3)
I tried:
1. start BIND with -4 argument ( named -4) - the server started but no changes on the delay.
2. disable IPV6 on the server - i tried the articles on the web but still i get IPV6 address.
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Feb 27, 2011
I try to forward all the network traffic on specific port from my VPS to home PC.The problem is that I have dynamic IP at home so I've installed Dynamic Update Client (DUC) from no-ip.com.I also use 'redir' software on Centos VPS to redirect the traffic and everything works fine till my ISP change the IP of my home PC.Does Centos cache DNS queries by default (nscd is not running)?Is there a some way/software that will periodically check if the IP of particular domain has changed and update accordingly.
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Jun 5, 2011
i'm not sure if this is because i'm having problems with my Raid setup, which mysql is running on, or if it is unrelated, but is anyone else noticing that mysql is VERY slow on Fedora 15?
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Jul 23, 2010
Right now I have a machine set up running Fedora. I have configured inittab to accept Console Logins, but I am having problems getting my netbook running PuTTY to connect. How would I go about finding the Host Name and Port to connect to?
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Jul 8, 2010
I recently switched from Ubuntu to Fedora to try Fedora out, but I cannot connect to my windows servers on my network. When I click on windows network it says "failed to retrive shared list from server".
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Apr 17, 2011
In Gnome Places->Connect To Server dialog, I am having problem using the Custom Location Service Type. I enter in the URI as
Code:
smb://username:password@ipaddress/share_name
I get an pop up error message that says:
Quote:
Cannot Connect To Server. You must enter a name for the server.
Which would be fine if there was actually a place for me to enter the name which there is not. What am I doing wrong. This is the first time I have tried using the Connect To Server dialog. Normally I just use a script I wrote to mount my share in a folder on my local drive as some programs cannot access the mounted network folder. In a browser all I have to do is:
Code:
smb://ipaddress/share_name
I tried using Windows Shares, but that did not work either. It does work if I click on network and access the share that way, but some programs like firefox and a few others that I want to save a file to my network drive do not show the network unless the share is mounted in a folder. So, I wrote a script:
Code:
#!/bin/sh
#mount ext storage drive
mount -t cifs //192.168.0.2/files -o username="username",password="password" /mnt/files
This works and I can use this, but it would be handy if I could just use the Connect To Server dialog.
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Mar 12, 2011
I'm running Ubuntu 10.10 and I'm having problems trying to assign it a static IP address. No matter what I put in the Preferences->Networking area (identifying the interface as Manual)... it still will query DHCP for an address if I run the dhclient command. I'm using to using ubuntu server where I just set the IP in the interfaces config file.
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Feb 21, 2011
I need to connect with a server apart from the server which I work on. What is the command for this?
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