Search reverse DNS

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• reverse DNS (PTR) entries

  The resouce said: http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/products_tech_note09186a0080094aad.shtml#topic9 States:

  "IP addresses from the pool of global addresses specified with the global command require reverse DNS entries to ensure that all external network addresses are accessible through the PIX. To create reverse DNS mappings, use a DNS pointer (PTR) record in the name-address for each global address mapping file. Without the PTR entries, sites may experience slow or intermittent Internet connection and FTP requests fail consistently. »

  Suppose that a network topology looks like this:

  A PIX with 3 interfaces:

  inside the interface (private public static IP 10.10.10.1)

  external interface (public static IP of 69.110.38.35)

  DMZ interface (static IP private address of the 30.30.30.1)

  The foregoing 1) says Will "reverse DNS entries" apply to this case?

  (2) if not, under what circumstances the DNS entries "reverse" apply?

  Thank you for helping.

  Scott

  DNS = domain name to ip

  Reverse dns = ip domain name

  Reverse dns is mainly used for authentication or should I say identify verification.

  for example, hacker is going to launch an attack using an invalid (i.e. ip address spoofing), so a server that receives the request will perform a reverse dns lookup to verify the identity of the ip address if it corresponds to a valid domain name or not.

  a typical use of dns reverse these days is to block spam e-mail.

  for the moment, not only of many server run the dns look-up, however, I believe that one day it will be very popular.

  However, to configure reverse dns, you must work with the Internet service provider, since it must be implemented on the isp, public dns server server non-local dns in your business.

• UTL_SMTP becomes suddenly slower

  Hello world
  
  We use the package UTL_SMTP to send mails to our applications. There is no if long, the e-mail were really fast. Now, it takes more than 10 seconds to send 3 emails with no attachment, it is not acceptable. You know a way to send mail faster?
  
  I read somewhere that in Oracle 10 g, we should use instead of UTL_SMTP UTL_MAIL? Would it be spead my generation of mail?
  
  Thank you!
  
  Bodart!

  leinadjan wrote:

  I think I found the culprit, it's the connection to the SMTP server. Each team of the procedure's appeal, we will open a new connection and shut us down. And the average connection time is 5 seconds. This three times and we have to wait 15 seconds.

  Does not seem reasonable. A tcp socket connection must be faster - if it's in the (slower) WAN infrastructure.

  The SMTP server could do DNS inverted for logging purposes. It accepts a client connection. The IP address of the client is available - but instead to use this only for purposes of logging, it can search the host name of this IP address. And then to use the host name for logging. (she also can use same basic access control based on the host and domain names),

  This is called a search reverse DNS and can translate by the initial client connection much slower.

  But I think I have must at least try to share connections for all mail and it will be a small gain of speed.

  You can't share a socket connection in sessions of PL/SQL. So, if the 123 session creates an SMTP connection, only he can use this connection.

  What you can do is put up a server to send mail from PL/SQL database. A PL/SQL package can use every method available in Oracle for the other sessions to communicate with IPC (Inter Process Communication). E.g. database of pipes, or queues or even just a simple table SQL vanilla.

  This package can create an SMTP connection, keep alive and remove all messages it receives other Oracle sessions. A corresponding message is transformed into a message and the SMTP connection is used to send it.

  This package can be run as a background using DBMS_JOB/DBMS_SCHEDULER process.

  Some methods of IPC supports multiple processes on the server - side cases this approach can be resized in something like 5 copies of this mail server code running. This supports then 5 simultaneous requests for sending mail. Kind of like the concept of shared/MTS server in Oracle.

  UTL_SMTP.close_data (v_connectionsmtp); What is the command that end the creation of my mail?

  Fix. This sends a period and a CRLF to the server to indicate that the e-mail full has been send.

  The server responds with a digital code (which UTL_SMTP must check the confirmation), then the server expects the next SMTP command from your code.

  I want to manage the connection manually, open it when it is null and close at the end of my script...

  Don't know what mean you "+ open when it's null +"?

  If you do not create a mail sending server in the PL/SQL code, it should look something like the following:

  connect to SMTP./mail server
  send HELO command
  while PLSQLServerIsActive loop
    if MessageOnQueue then
      DequeueMessage
      send MAIL FROM command
      send RCPT FROM command
      send DATA command
      send e-mail
      send period + CRLF (end-of-mail)
    end if
  
    if TimeIdle > 60 seconds then
      // tell the SMTP server that we're still here in order
      // to prevent it from timing us out and closing the
      // tcp connection
      send RSET command
    end if
  
    // shutdown when commanded to
    if ReceiveServerShutdown  then PLSQLServerIsActive := false
  end loop
  send QUIT command
  

• What means "Blacklist DNS reverse response searching for known malware domain spheral.ru - Win.Trojan.Glupteba (1:31600)"?

  I have a Cisco ASA5516x w / firepower with an IPS license installed and I'm trying to determine what means this Impact 1 alert:

  Reverse DNS BLACK list response searching for known malware domain spheral.ru - Win.Trojan.Glupteba (1:31600)

  The source looks like it's coming from DNS servers on the internet:

  208.67.220.220

  208.67.222.222

  4.2.2.6

  204.117.214.10

  The destination is our domain controllers that are configured to be our DNS servers. I'm just trying to understand what really means this alert? The classification is "a network Trojan has been detected", but this means that a user attempted to solve an to a site that has been reported as malicious DNS record, or they have malicious software on their PC that is trying to connect to a server command & control out in the wild? To be clear, the penetration of these alerts are outside interface and evacuation is our inside interface. If someone can provide a clear explanation for these alerts, it would be greatly appreciated. Thank you!

  Hello

  This does not necessarily mean that the PC or the DC are infected. This rule is for a reverse DNS lookup.

  With the source and the destination, it could just be a package that is the reverse DNS lookup query response. Now, why this request is sent in the first place is a question and a value of the investigation.

  flow: to_client; content: "|" 07. spheral | 02. ru | 00 | » ; fast_pattern: only;

  Download the capture of packages in the case of the rule, you can check and verify the IP address that is resolved to spheral.ru and then identify what PC initiated the request.

  Sometimes, it could be an AV product or security, try to reverse search DNS for an IP address of the suspect.

  Rate if helps.

  Yogesh

• Why am I messages DNS error since upgrading to El Capitan?

  Since I upgraded my OS to El Capitan I was making (Yahoo Search page) DNS error pages when I use an Internet link to leave my email to another site. Its pretty boring and I have to use Safari where it happens. I like FireFox, but if I can't solve this problem I will be forced to stop using it. Help, please. Thank you, Michael.

  You might have installed something more. On Mac, this problem is associated with some extensions Spigot, especially one named Searchme.

  Open the page modules using either:

  • CMD + SHIFT + a
  • "3-bar" menu button (or tools) > Add-ons

  In the left column, click Extensions. Then on the side right, remove or disable Searchme - and anything else that you don't need, like all the other Spigot/MyBrowserBar extensions. Keep in mind that all extensions are optional and none is included with Firefox when you get it first.

  Often, a link will appear above at least an extension disabled to restart Firefox. You can complete your work on the tab and click one of the links in the last step.

  Is that what helps you regain control?

  This could be the tip of an iceberg of malware. When you install free software, you often get the options grouped under silence. I don't know the best way to 'clean up' a Mac of these elements, but you may want to consider the issue.

• Is the last protégé of Firefox geolocation search machines?

  There is a link I found on the Forum which was a bit like "subject: location" or something like that blackened being located geographically on Firefox. I lost it in my notes. Anyone know it? I now have the latest version of Firefox. The latest version automatically protected against geolocation devices come from the outside?

  "Location-Aware Browsing" is only useful if you connect via a wireless access point.
  
  Otherwise, a reverse DNS look up from your IP address is used and is generally not very accurate and this is probably what you're feeling.

  Firefox will always ask for permission before using the geolocation.

  • http://www.Mozilla.com/Firefox/geolocation/

• DNS server records to monitor traffic.

  I do not understand much about it so I hope someone can explain to me.

  I have a server configured with a DNS server running successfully on my mac mini (dns primary server for the House).

  I was wondering if there is a way to capture the DNS server logs and monitor visited Web sites of specific host ips/name?

  I don't have an example to make immediately available, and I expect that it will be the analysis or an output channel created manually or otherwise searching the DNS server connects.

  If your firewall blocks all outgoing DNS traffic except for DNS queries on the server (this is to avoid without entering the DNS server, register via VPN or other), you can turn on extra logging through the command line, and then check the DNS server logs.

  This configuration is probably more commonly implemented with either a network sniffer I look for DNS queries arriving at your server, or perhaps a web proxy server, as this proxy server gets you the customer information and the target host information, as it won't be all kinds of activities related to the web-is in the DNS for a typical client newspapers.

  Activity network Apps, app updates (various which may seem HTTPS traffic, too), multiple streams of data, etc.

  HTTPS and VPN can throw a key in these listening and data collection activities, unfortunately.  They can hide the access or hide the DNS query, according to the monitored computers.

  There are approaches especially here, including the firewall of filtering (or notation) and the mechanisms of OS X such as Parental controls, depending on the specific details of your needs here.    There are examples posted around the network to use Wireshark or tcpdump to acquire the DNS of your network data, as well.

  Details on the management of the BIND 9 command line - i.e. when there is hair - are available in the ISC BIND documentation, such as 9.10.  Find statement grammar and record the setting up an output channel, as a starting point.

  For recent versions of OS X Server, BIND configuration files are under/Library/Server.  (See this discussion, as well.)

  Changes to the configuration files can sometimes fail.app, unfortunately.   Close.app, make the changes to a copy of the file, then restart.app (and I hope Server.app don't spill or undo your changes).

• What it means that the DNS server instead sends a node adapter directly status request to the IP address?

  What it means that the DNS server instead sends a node adapter directly status request to the IP address involved in the reverse DNS query. When the DNS server gets the NetBIOS name of the node status response, it adds the DNS domain name specified in the WINS - R record the NetBIOS name provided in the node status response and passes the result to the client applicant. ?

  Hello

  Please repost these questions in the Technet Forums

  http://social.technet.Microsoft.com/forums/en-us/category/WindowsServer

  See you soon.

• How to fix these problems-RealtekRTL8139 Family PCI Fast Ethernet NIC - failure, failure of DHCP server DNS - a failed, Proxy Web IE Failed Server

  I can't access yahoo or gmail email, I can't play games online and java installs on my home comp. ed. - windowsxp, I ran the system diagnostics and it entered all these things as having failed. DHCP server computer was not able to renew is the network address, the semaphore time-out period has expired, the ip address 205.185.234.119 for the network card with network address 00402B7C88DD has been denied by the DHCP server 0.0.0.0, it sent a DHCPNACK message, your computer has lost the lease to its IP 192.168.100.1. Proxy Internet Explore web 127.0.0.1 Server failed, seems to be running on ports - zero, the search of DNS servers failed order. HELP how I can solve all these problems?

  It should be fixed, had to use unlocker in safe mode to remove (the hosts file that was read-only)

  Given that I could not delete it in safe mode either. But trojan remover updates now (Nothing could be updated). So I would say its fixed.

  And something had added a proxy and added something to svchost in the registry. What trojan remover removed.

• question about DNS records

  Hello

  I installed on my windows 7 NAS synology (to put my video and music on it), now I can connect remotely to my URL of SIN, which is for example http://bob.synology.me:5000.

  now, I have installed on it video station and when I get like the bob.synology.me:5000/video instructions.  I've got access denied because of reverse DNS.

  what I need to do / nested dns record video.

  My only question is here after someone has a bob.com URL and then he wants to access some software on their server in this example is a video you need to do a separate DNS record after / Video

  Johan

  Hi Johan,.

  The problem you are having is better suited in the Microsoft TechNet forum. We have a dedicated team to help you with such questions. I suggest you post the same question in the Microsoft TechNet forum for assistance.

  Microsoft Technet Forum: http://social.technet.microsoft.com/Forums/en-US/home

• localhost DNS name

  
  When I deployed the virtual appliance for log Insight and crossed the different dialog boxes for deployment, I've specified a host name for the virtual device in network properties. Once the virtual appliance has been deployed and marketed, I SSH'ed in the virtual appliance and noticed that the host name in the virtual appliance OS always the value "localhost". Is this by design?  I assumed it would take the name of the FULL host name that I have provided in the network properties screen.

  -Mike

  The reverse DNS lookup is probably causing the problem. Thank you to report this, I'll make sure it gets added the release notes.

• SSO installed with reverse lookup failure

  We are preparing for the upgrading of our existing environment vSphere 5.0 to 5.1 vSphere.  I have tried a simulacrum of SSO Server installation and have also run the pre-installation of SSO control script and we discovered a problem in our environment.  To explain the problem I need to provide some documentation on configuring DNS in our environment.

  There are two DNS solutions in our environment, Corporate DNS (UNIX) and DDNS (Dynamic DNS - Active Directory).  DDNS was deployed with the introduction of the ma, before all systems use DNS Corporate.  When introducing DDNS DNS services have not been migrated, rather DDNS is used only by the AD and Windows Client/Server environment. In addition, DDNS is not configured for reverse DNS resolution, all these applications are forwarded to the Corporate DNS.

  As you may or may know is not one of the conditions for the deployment of SSO to have a reverse lookup DNS configured and for each DC and the UNIQUE server authentication has a properly configured PTR record (http://kb.vmware.com/kb/2033880).  Since we don't use DDNS for reverse resolution PTR records are nonexistent.  Therefore, installing SSO up warning about the failure reverse DNS and the pre-installation script displays warnings re 'IP address name Check' SSO for the SSO Server and each domain controller in the domain.

  We are wondering if anyone else has encountered this problem? and if so what they did to solved the problem

  any help would be appreciated

  Hello

  You can find UNIQUE authentication Setup performs a lookup on each interface on the server and therefore launch a mistake say an interface "backup" that don't have not may not reverse DNS entries.

  If you are able to provide a manual reverse lookup on the IP address that you have on the same subnet for vCenter, you should be able to continue without a problem.

  See you soon,.

• ESXi 5 in AD / DNS configuration

  We are preparing to implement VMware with ESXi. We are an ORGANIZATIONAL unit in an AD environment. I understand that I must have research front and rear, set up in the DNS system. We do not have our own DNS servers, they are managed by the people who run the AD. I asked as the two parameters of research direct and reverse DNS for these ESXi servers. The administrator AD says that since they are not part of ad that it cannot configure reverse look up.

  I see a few articles on adding servers to AD ESXi. If I will not be the DNS automatically register as do my Windows servers? Any input would be appreciated; I'm just trying to get a handle on this.

  One of the articles I found is listed below.

  http://www.virtualizetips.com/2010/07/configure-VMware-ESXi-4-1-for-Active-Directory-integration/

  ESXi hosts will not automatically register in DNS.

  All they need do is create a pointer to host (A) in DNS for each ESXi hosts.

  Please allow points to useful/correct answers

• Change DNS data recovery device name

  I like a clear designation of all systems that I managed.

  This is why I would like to know, if it is supported to rename "localhost". If so, how?

  Thank you

  André

  I noticed that if you do not have a DNS entry for the host name, then change the host name to localhost.localdom.

  There is a script/opt/vmware/share/vami/vami_set_hostname, that gets run when starts. Does a search of dns rev for the IP as follows:

  Home w 10 t < ip > eth0

  If DNS does not resolve this request for ip address, it sets the hostname to localhost.localdom

  Make sure that your DNS server can resolve the rev (and fwd) entered for this host name lookup

  If you cannot configure your DNS with the name of host/ipaddr of this unit and still want the name to persist, you can try the following steps (note that only is not supported or validated by VMware)-I've tried it in my test environment and it seems to work

  Once you have set to day/etc/hosts, / etc/hostname, sysconfig to your settings

  CD/opt/vmware/share/vami

  CP vami_set_hostname vami_set_hostname.orig

  Put the following 4 lines in comment in vami_set_hostname (from line 54 of file)

  1. $ CP $HOSTFILE

     1. v grep ' ^ 127.0.0.1 "< $"

     .orig .orig > $HOSTFILE

  1. echo "$127.0.0.1 HN. $DN $HN localhost' > > $HOSTFILE

  1. echo "$FQDN" > $HOSTNAMEFILE

  This will ensure that this script does not overwrite the files whenever the device is restarted.

  I have the following in my camera (I don't use DHCP, but have a static ip address setting)

  a. update the file/etc/hosts as you like

  127.0.0.1 localhost

  < ip > < hostname > < FQDN >

  b. update the file/etc/hostname with the FQDN

  c. update the sysconfig to change the following

  Host name = < host name >

  DOMAINNAME = < domain_name >

  d. update the sysconfig to change the following

  DEVICE = eth0

  BOOTPROTO = none

  ONBOOT = yes

  TYPE = Ethernet

  IPADDR = < ip of the device >

  NETMASK = < netmask for device >

  GATEWAY = < gateway ip addr >

  = < Addr broadcast > BROADCAST

• Cannot disable "localization." However, Google Maps opens to my exact location.

  Hi all

  I read in the forum after forum on Google and Mozilla and have tried many steps like turning off "geo-enabled" in all: config, etc.

  Every thing in the settings of Google is set to 'Pause', which I think is also disabled because you can turn them off, but when I go to the site of Google Maps, it always zooms in on my position real and true.

  I tried navigating to another city and then completely close the Firefox browser, but then when I go back to Google Maps, it zooms in to my actual location. How in the heck is Google Maps knows that if the Firefox browser is not it?

  When the page opens, here's what it says in the address bar:
  https://www.Google.com/maps/@33.XXXXXXX,-86.xxxxxxx, 12z

  with the x being the rest of my exact location of lat/long. As I said, where is this latitude/longitude information from otherwise the browser?

  Any help would be greatly appreciated.

  As always,.
  Hugh

  .

  If geolocation is not used, then Web sites can do a reverse DNS glance upward from your IP address and is generally not very accurate.

  Firefox will always ask for permission before using the geolocation.

  • http://www.Mozilla.com/Firefox/geolocation/

  You can use websites like these to see how your location is indicated by a reverse search DNS of your IP address:

  • http://www.YouGetSignal.com/tools/network-location/
  • http://whatismyipaddress.com/