What is a DNS?

Similar Questions

• WHAT IS A DNS SERVER? UNABLE TO DOWNLOAD GOOGLECHROME?

  Is what is called the boot! Keep the same problems? Makes troubleshooting! Returned, (DNS SERVER) is NOT an answer? What is a DNS server? What dose it do? How should I do? This is the reason why I can't download GoogleChrome? Thanks for your help!  HP HOME PREMIUM, IE 9 WINDOWS 7 64 BIT bought in October 2009

  Hi VivvyGurnett,

  Thanks for posting in the Microsoft Community.

  DNS is a system that is used in networks TCP/IP for naming computers and network services. DNS naming locates computers and services through user-friendly names. When a user enters a DNS name in an application, DNS services can resolve the name to other information that is associated with the name, for example an IP address.

  I suggest you try to download the browser using an alternative installer.

  See the link.

  http://support.Google.com/installer/bin/answer.py?hl=en&answer=126299

  If you're still having problems, please do not hesitate to post we are here to help you.

• 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

• What is a dns server?

  Hello, like all other issues I could not my search on the web on MSN to respond. He said he was do not connect the DNS. I had the web page to the top, but he did this the last time. I have a modem router (no comcast, cavalier) and I was wondering if it might be my internet provider? Thank you

  Hi MaryGross,

  The provider of Internet services (DNS, Domain Name System) is a standard technology to maintain the names of Web sites and other Internet domains. It is an Internet service that translates IP addresses into domain names.

  You can try to reset the modem or the router, and the check for the issue.

  a. disconnect the cable that connects the computer to the modem.

  b. turn off the modem / router.

  Note: If the modem or the router does not have a power switch, turn off the power to the modem or to the router.

  c. restart the computer.

  d. Once your computer has restarted, turn on the modem or the router, connect the cable from the computer to the modem or the router and restart the computer.

  e. make sure that all network cables are properly connected.

  f. start Internet Explorer.

  I would also ask you to contact the manufacturer of your modem/router to know how to reset a router or a modem.

  If you are always faced with the question, then you must contact the ISP for further assistnace.

  Hope this information is useful.

• El Capitan is unable to reset DNS

  Hello

  I use 2011 27 "mac desktop. Recently, my developer changed my Web site and the server and my machine keeps using old sites DNS. My developer was blocked and asked me to give my DNS connection with this command.

  sudo dscacheutil - flushcache. sudo killall - HUP mDNSResponder. say DNS cache empty

  I tried this million times. He made the order and say DNS is empty, but nothing changes on my machine. Still cannot access my Web site.

  I have also tried to restart the browser, clear the cache, clear history etc. I tried a few other browsers as well but all the same.

  What I would do.

  Help, please.

  Thank you.

  Armands

  Well, if you have emptied your cache a bazillion times, then the most likely cause is that servers DNS, you reference don't have either not acquired the DNS update-DNS servers cache also the translations, and it can take up to the value of life (TTL, Time To Live) to propagate, or the DNS update has not been correctly and so spreading to all.

  Most people doing a cut-over site will fix the low TTL value in the day or two, leading to the cut-over to avoid this problem, if I guessed correctly about the cause of the problem.

  If your web server is named server.example.com, then the following command line commands will show what the translation is for your local cache and - if the cache was emptied - your local DNS servers have the IP address of your server, and the second command will show what Google's DNS (8.8.8.8) servers have the same translation.

  Dig + short server.example.com

  dig + short @8.8.8.8 server.example.com

  Google's DNS servers tend to capture the DNS changes fairly quickly, while some devices of bridge - those that caches the translations - and various ISP DNS servers could not or will not pick up the translation for a day or two. until the TTL expires.

  As a temporary workaround - and assuming that the Google DNS servers return to the new IP address - you can temporarily set your DNS server address (System preferences > network > select your network > advanced > DNS > 8.8.8.8 and 8.8.4.4) for a day or two. until your local caches to catch up.   Don't forget to remove these settings and to return to your DNS-DHCP-set server settings.

• DNS is?

  DNS server.

   

  To resolve connectivity issues sometimes professional of computer science will be asked to change the DNS servers used by your computer.

  I personally do a lot here in HP Forums.

  the reason is that I am eliminating the likelihood that what you are experiencing is due to DNS resolution conflict. So that it do not understand what is this or the goal.  I created this article in the form of a post with the intention of explaining what it is and why we are asking this measure to take.

  It's for people who do not have a lot of experience networking and or knowledge in the use of jargon in the field. Is not intended for professionals in the implementation of network and computer or users with a lot of experience due to the fact that I won't go into the details of the advance of the time Service.

  Let start by understanding what is the DNS server and the way in which your computer uses.

  The domain name system was invented originally to support the growth of communications by electronic mail on the ARPANETand now supports the Internet globally. Before DNS, we used most of the time a simple system called the system of host table name, now we use a more robust system of DNS (Domain Name).

  To have an Internet experience, having a reputation system is vital for the operation and due to this DNS is an important part of the network as a whole.

  After TCP/IP is the set of protocols for network usage and most use in the world today is used by Microsoft, Apple and Linux for networking.

  This is a quote from Wikipedia, the free encyclopedia
                                      
  "The domain name system (DNS) is a hierarchical distributed naming system names for computers, services, or any resource connected to Internet or a private network. .

  • It associates various information with domain names assigned to each of the participating entities.
  • Resolves queries for these names into IP addresses to locate the devices and services all over the world.
  • By providing a worldwide, distributed keyword- based, redirection service domain name system is an essential part of the functionality of the Internet . »

    DNS stands for DOMAIN NAME SERVICE, this is a list of websites (database) on your network to use when tries it to find the a webbing in the internet. This allows you to enter a name easier and more convenient in the address bar, then you will have to, if this service does not exist.

    For example if you want to type 15.216.110.140, 15.193.112.142 to get a web site that is important to you and how do we determine what site is that it will be hard for you, it will be difficult if not impossible for me who have years of experience in the field. It's the IP address of www.hp.com you see that it's easier to remember because we can we can associate with the company we want to access and more is evidence that we can remember more easy words

    Why ask us for the change?

    Most DNS servers are very reliable and work properly that is why most of the user do not know what they are or even they are there.  But sometimes as any other database a record or records can get corrupt, that either other factors created this list do not work because we are use to.

    To isolate the problem, you will see a lot of professionals you will be asked to change the DNS servers used by your computer. This number matches the DNS resolution problem.

  I do this as a standard troubleshooting steps when connectivity can be a problem. It is a simple process, and can save a lot of problems if you're actually the problem that you are facing.

  Since I'm a Microsoft Certified Professional I will talk of windows t and how to assign DNS servers in this operating system in the future, I'll explain how do on several other operating systems such as Mac OS, iOS, and perhaps even Linux, although I think you're adventurous enough to use Linux or any distribution of it.  You know what I mean. and do not need a lot of explanation on this topic.

  If you are using windows go to this Article in the Microsoft Knowledge base and he will guide the process.  http://Windows.Microsoft.com/en-us/Windows-Vista/change-TCP-IP-settings

  I hope this explains what it is and how it can affect the tranquility of network connectivity.

  Really hope that this is useful for some of you;

  RobertoR

  I welcome comments or questions.
  RobertoR

• "Is that my DNS" of CYBERsitter legit?

  A friend recommended I have install the free "what is my DNS?" CYBERsitter program. See the link...
  http://www.solidoak.com/CYBNewsFeb08.htm

  Is this a legit company? Someone knows about them?

  Mark

  Latitude D610, Pentium M 760 (2.00 GHz)
  1024 MB OF SDRAM, 2 DIMMS
  ATI Mobility Radeon X 300 graphics card
  Windows XP
  MS Office 2003 SBE

  
  

• 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.

• DNS virtual or physical: best practice on environmental HA/DRS

  Hi all

  Our current infrastructure consists of 19 ESX 1 vCenter, 2 Virtual DNS. All our aggregates are configured for HA/DRS.

  Last week, our team changed network configurations and we had a storm to spread on the management network. Half of our virtual machine have been stop HA, including our 2 Virtual DNS configuration. We had a hard power on these servers, first recorded, then locked, etc...

  I want to avoid this kind of problem in the future.

  So, what I current DNS cluster DRS/HA Server? Do I need to have a physical?

  Thank you

  A couple of things here. You might want to "review" your design around the 'Isolation response' decision which could cause virtual machines to be powered off in scenarios like these where hosts are "flooded" with traffic. It is an attack of back on your own network that's happened. With or without a review medical Server DNS scenario more that would be the same.

  Duncan (VCDX)

  Available now on Amazon: vSphere 4.1 HA and DRS technical deepdive

• DNS and routing

  Hi Everyboady I'm quite new to vmware esxi and I'm not sure of what the parameters of information to the host dns name.

  What is my dns from the router or my example custom dns:

  domain controller

  can someboady tell how can I do this for personal watercraft

  Thank you

  Khaled Lekshmen

  Hello

  You must add the host name of your ESXi host on your DNS server. After that, your PC of management should be able to resolve the hostname to its IP address. Then, you connect the VI client software to your ESXi host using its DNS name instead of having to use the IP address.

• Sudden home networking issues

  Product name: Macbook Pro 13 inch Retina early 2015.

  OS (when the problem started): Yosemite 10.10.5

  OS (now): El Capitan 10.11.5

  The problem

  So yesterday my Mac Wifi connection dropped suddenly. So, I moved to lightning Ethernet connection which has varied between does not and VERY slow, almost unusable. I work from home online, so the last 2 days I was not able to do anything.

  I can connect to Wifi, Mac said Internet: accessible. I can ping. But can not browse and other tools such as Google Drive and Dropbox are unable to connect.

  So far, this would indicate a problem with my network or my router, rather than my right to the machine? However, my Android phone works fine with Wifi.

  Things I've tried:

  I've been on Yosemite 10.10.5. I followed all the troubleshooting steps basis and the following:

  • Reset my SMC.
  • Reset my PRAM.
  • I turned off the Bluetooth.
  • I deleted the files in Network preferences to reset a reboot.
  • I "forgot" my home network to reset it like that.
  • Running reports "wireless diagnosis" everything is "as planned."
  • Attach to the Wireless on my Android Nexus 5 X hotspot. Connects to the Wifi but not Internet after 10 seconds. Sometimes not at all.

  Then, I took a backup and upgrade to El Capitan. The strange thing is, about an hour after the upgrade, my ethernet cable was working fine again! About 14:00 yesterday at 09:00 today when I turned on it to start working.

  NOTE: I connect to the network fine, and Google Drive and Dropbox plugins start synchronization. Full report 'sync', then, after about 10 seconds, they say "unable to connect". Holding "option/alt" and clicking on the Wifi symbol in the toolbar says "Internet: accessible. Indeed, I can 'ping' very well. There is no loss of data packets. So could it be a software on my machine which has suddenly become crazy and prevents connections other than the pings? I have run Avast Anti-virus, but which has worked for months and is running as I type this. Similar posts often get answers their questions about firewalls and proxies that might cause the problem. I only have Avast.

  Affirmations:

  If it was a problem with my router, my phone would not have a problem too?

  If it's a problem with my Mac, why would Internet suddenly started working again after a while?

  I write this in a coffee shop, using their Wifi and it works fine. I don't have whatever it is off on my machine. Yet once, which suggests a problem with my network rather than the phone.

  Is this something that could be fixed to an Apple Store? As I suspected, it works very well to the coffee then probably it would work fine in the Apple store and they don't know what to do.

  I thought only try you geniuses first!

  Thanks in advance.

  It is very difficult to debug an Internet without Internet problem.

  First of all uninstall AVAST from the system. then open system preferences > network > enter your network > what is place please do as automatic. What, the other DNS settings, preferred networks etc please post.

• Satellite U205 will not connect to internet

  I think it must e a DNS problem?
  What are my DNS settings? I put it to automatically set the DNS.
  I can run Skype without problem so I know that the wireless router works.

  I have also 2 other computers work fine on the rounter wireless and access to the Internet.
  When I try to Ping www.google.com on the Toshiba I get a negative response, so I can't Ping any URL.
  I ran a diagnostic and received the response below.

  My wireless router is 192.168.15.1 and my ISP router is 192.168.1.1.

  Can someone help me. PLEASE, I BEG YOU!

  The machine information
  Seller: TOSHIBA
  Machine Name: Satellite U205
  Version: Version 1.10 BIOS
  OS: Microsoft Windows XP Professional
  OS SP:Service Pack 3

  Back to top
  IP information
  ipconfig/all
  Windows IP configuration
  Name of the host...: SHARONSNEW
  Primary Dns suffix...:
  Node... type: hybrid
  Active... IP routing: No.
  Active... proxy WINS: No.

  Ethernet connection to the Local network card:
  State of the media...: Media disconnected
  ... Description: Intel(r) PRO/100 VE Network Connection
  Physical address.... : 00-0E-7B-D9-50-E6
  Ethernet wireless network connection card:
  The connection-specific DNS suffix. :
  ... Description: Intel(r) PRO/Wireless 3945ABG Network Connection
  Physical address.... : 00-13-02-82-BE-C5
  DHCP active...: Yes
  Autoconfiguration enabled...: Yes
  ... The IP address: 192.168.15.103
  ... Subnet mask: 255.255.255.0.
  IP address: fe80::213:2ff:fe82:bec5 5%
  ... Default gateway. : 192.168.15.1.
  DHCP server...: 192.168.15.1.
  DNS servers...: 192.168.1.1.

  Card tunnel Teredo Tunneling Pseudo-Interface:
  The connection-specific DNS suffix. :
  ... Description: Teredo Tunneling Pseudo-Interface
  Physical address.... : FF-FF-FF-FF-FF-FF-FF-FF
  DHCP active...: No.
  IP address: fe80::ffff:ffff:fffd 6%
  ... Default gateway. :
  NetBIOS over TCP/IP...: disabled
  Card tunnel Automatic Tunneling Pseudo-Interface:

  The connection-specific DNS suffix. :
  ... Description:. Automatic Tunneling Pseudo-Interface
  Physical address.... : C0-A8-0F-67
  DHCP active...: No.
  ... The IP address: fe80::5efe:192.168.15.103%2
  ... Default gateway. :
  NetBIOS over TCP/IP...: disabled

  Back to top
  The protocol information
  Protocol binding information

  Microsoft TCP/IP version 6
  Intel(r) PRO/100 VE Network Connection
  Intel (r) PRO/Wireless 3945ABG Network Connection
  Map Microsoft Tun Miniport

  Protocol of the AEGIS (IEEE 802. 1 x) v3.4.9.0
  Intel (r) PRO/Wireless 3945ABG Network Connection
  WLAN transport
  Intel (r) PRO/Wireless 3945ABG Network Connection

  WLAN transport
  Intel (r) PRO/Wireless 3945ABG Network Connection

  TOSHIBA Network Device Usermode i/o Protocol
  Intel (r) PRO/Wireless 3945ABG Network Connection
  Intel(r) PRO/100 VE Network Connection

  Point to Point Protocol Over Ethernet
  Intel (r) PRO/Wireless 3945ABG Network Connection
  Intel(r) PRO/100 VE Network Connection

  Point to Point Tunneling Protocol

  Layer 2 Tunneling Protocol

  Remote Access NDIS WAN driver
  Direct parallel
  Miniport WAN (PPPOE)
  Miniport Wan WAN (PPTP)
  Miniport Wan WAN (L2TP)
  RAS asynchronous card

  NDIS usermode i/o Protocol
  Intel (r) PRO/Wireless 3945ABG Network Connection
  Intel(r) PRO/100 VE Network Connection

  TCP/IP protocol oriented messages (SMB session)

  WINS Client (TCP/IP) Protocol
  Microsoft TCP/IP version 6
  Intel(r) PRO/100 VE Network Connection
  Microsoft TCP/IP version 6
  Intel (r) PRO/Wireless 3945ABG Network Connection
  Microsoft TCP/IP version 6
  Map Microsoft Tun Miniport
  Internet (TCP/IP) Protocol
  Network adapter 1394
  Internet (TCP/IP) Protocol
  Intel (r) PRO/Wireless 3945ABG Network Connection
  Internet (TCP/IP) Protocol
  Intel(r) PRO/100 VE Network Connection
  Internet (TCP/IP) Protocol
  Miniport Wan (IP)

  Internet (TCP/IP) Protocol
  Network adapter 1394
  Intel (r) PRO/Wireless 3945ABG Network Connection
  Intel(r) PRO/100 VE Network Connection
  Miniport Wan (IP)
  Back to top
  Information about the network device
  Intel (r) PRO/Wireless 3945ABG Network Connection
  Device ID: PCI VEN_8086 & DEV_4222 & SUBSYS_10408086 & REV_02\4 & 3E7C1 280 & 0 & 00E2
  Status: activate
  Vender Driver: Intel
  Driver version: 12.0.0.73
  Driver date: 27/04/2008

  Intel(r) PRO/100 VE Network Connection
  Device ID: PCI VEN_8086 & DEV_1092 & SUBSYS_00011179 & REV_02\4 & 6D5B 6 b 1 & 0 & 40F0
  Status: activate
  Vender Driver: Intel
  Driver version: 8.0.21.101
  Driver date: 10/10/2005

  Back to top
  Status of communication switch and wireless wireless keyboard shortcut
  Wireless Communication switch: on
  Shortened wireless keyboard (Fn + F8)
  Wireless LAN: on
  Bluetooth: Off

  Back to top
  Diagnostic results
  Ping option: on
  Ping check: Yes
  Ping Retry: 3 (times)
  Ping Time: Out 300 (ms)

  < network="" adapter="">>
  Description network adapter: Intel (r) PRO/Wireless 3945ABG Network Connection
  Status: activate
  Mac address: 00-13-02-82-be-c5
  IP address: 192.168.15.103
  < ping="" status="" list="">
  Default gateway:
  192.168.15.1 [OK]
  DNS server:
  192.168.1.1 [OK]
  WINS server:
  Parameters: no
  Proxy server:
  Parameters: Do not use

  < network="" adapter="">>
  Description network adapter: Intel (r) PRO/100 VE Network Connection
  Status: activate
  Cable LAN status: disconnected

  Back to top
  ConfigFree Version
  ConfigFree (TM) 5.90.05
  Database 3.00.02

  Back to top
  Network Diagnostics
  No problem found

  Hello

  You have posted a lot of info that confuse finally
  Generally, the router must manage a pool of IP addresses, the IP addresses should be assigned automatically to each laptop computer that tries to connect to the router.
  So in your router settings dynamically assign addresses IP must be activated.

  In addition, you should check if the MAC address filtering was not activated because this could cause the laptop to connect.

  The WLan connection properties contain the TCP/IP protocol. The TCP/IP protocol contains a few options. Here, you must make sure that all (IP address, gateway, DNS) is set to obtain automatically.

• Gaberlunzie in the terminal instead of the hostname prompt

  Hello

  I launched terminal today and instead of the usual "HOSTNAME: directory$ ' format, he says" Gaberlunzie: directory$.  I left the terminal and restarted and it was gone and I was not able to reproduce.  From the Windows world, this seems highly suspicious to me.  Has anyone seen this happen on their Mac?  I downloaded Avast Mac Security and perform a scan just as a precaution, but I thought that I would like to tender hand to the community to see if anyone had any ideas as to the reason for this strange behavior.

  Thanks in advance.

  JC

  The bash shell when the substitution therapy \h in your string of prompt PS1 taking your IP address of nn.nn.nn.nn and a loss by doing a DNS lookup.  If the DNS server returns a name, that name appears under your host name.  If this isn't the case name is returned, then your system preferences-> sharing-> computer name is displayed.

  Your DNS server gave your Mac this Gaberlunzie name because at the same time Gaberlunzie registered with the DNS server it name associated with the IP address you are using.

  It must have been a temporary situation as the next time that you start a session of shell bash that research did not return Gaberlunzie.  If I had to guess, I would say that gaberlunzie re-recorded with the DNS server under a different IP address, so the former association with the IP address you are using has been removed.

  If you do not want to be subjected to what the server DNS has said that your host name is that you can change your PS1 prompt string to use something like

  Ps1 = "$(networksetup-getcomputername):\W."

• Windows 7 keeps losing internet connection?

  OK, so, since yesterday, I noticed my internet connection went on vacation, so I'm not used: unplug the modem and router for 30 seconds. (Or more). However, this occurred about 3 times in the same hour. It worked so well for the rest of the day. Now, today, happened about six times. What I notice is that it does not set itself when I unplug, but every time there is a new problem.

  There was a "DNS server is not responding" one who came 3 times however.

  But at the time it happened.

  I'm not a person tech or all what you call them.

  So, naturally I don't understand what all this means. What is the DNS server?
  What does all this in the middle of the screen capture?

  And how can I stop losing the internet connection?

  

  Hi, Freddy.

  Method 1: Manually assign the IP address and the default gateway and check if it works very well.

  Before assigning the IP address and the default gateway, make a note of the IP address of the computer. To do this open command prompt, type ipconfig and press to enter. This displays the IP address, make a note of it.

  To manually assign the IP address and default gateway, follow these steps:

  a. in the system, right click on network icon tray. Choose Open network and sharing Center.

  b. right-click on Local area connection and click Properties.

  c. double-clickProtocol Internet Version 4 (TCP/IPv4) and assign the IP address manually.

  Example: Old Ip address is 192.168.0.1
  Replace the IP 192.168.0.50

  d. that the subnet mask and default gateway are the same.

  Subnet mask = 255.255.255.0

  Gateway by default, would usually 192.168.0.1 or 192.168.1.1

  e. click apply then click Ok and restart the computer and check if it helps to solve the problem.

  Method 2: Temporarily disabling the firewall on your computer and check if it makes a difference.

  
  http://Windows.Microsoft.com/en-us/Windows7/turn-Windows-Firewall-on-or-off

  Note: You should not turn off Windows Firewall unless you have another firewall is enabled. Turning off Windows Firewall may make your computer (and your network, if you have one) more vulnerable to damage caused by worms or hackers.

  Method 3: How to reset the Protocol Internet (TCP/IP)
  http://support.Microsoft.com/kb/299357

  Please post back with the results and we will be happy to help you further.

• Replacement of the ALIAS statements

  I am updating a configuration inherited at 6.3 and use PDM, for ease of maintenance. The configuration is a step 3 515, with servers face outwards on the DMZ.

  The inherited configuration using ALIAS' are to allow internal users to access the servers in the DMZ using their global IPs rather than their local IP addresses. The ALIAS' are are also applied to the DMZ itself allowing a server DMZ talk to one another using IP Global of the latter. Statements of typical aliases for a given server would be:

  ALIAS (INSIDE) 192.168.2.1 x.x.x.x 255.255.255.255

  ALIAS (DMZ) 192.168.2.1 x.x.x.x 255.255.255.255

  192.168.2.1 is the IP address of a server on the DMZ where x.x.x.x is the global address.

  PDM does not support alias commands so I replaced the old statement with DNAT:

  static (DMZ, inside) x.x.x.x 192.168.2.1 netmask 255.255.255.255

  This method works fine to allow internal users to access the DMZ servers with their global IP address.

  However I can't see how to apply this approach to servers on the DMZ.

  Can anyone help please?

  Looks like you have a very good understanding of the work of the alias command. Is not an easy thing for most people...

  But I would point out an error in your post. My guess is the alias command is doing what we call "DNS Doctoring" destination NAT. Which means that as servers on the DMZ has a DNS reverse lookup for other servers on the DMZ, the DNS server responds with x.x.x.x. The PIX intercepted this answer and replaced the address in the answer DNS with 192.168.2.1 for servers on the DMZ could access other servers through their local address, and not the global address.

  Make sense? Your first static is so perfect for destination NAT for internal users trying to hit the DMZ servers via their global addresses. To do this work for "DNS Doctoring" all you have to do is to add "dns" at the static (s) on the PIX you need to access from other servers on the DMZ. Using your address examples, something like this:

  static (dmz, outside) 192.168.2.1 x.x.x.x dns netmask 255.255.255.255

  Take a look at the Ref order here:

  http://www.Cisco.com/univercd/CC/TD/doc/product/iaabu/PIX/pix_sw/v_63/cmdref/s.htm#wp1026694

  I hope this helps.

  Scott