Posts tagged: linux

Sep 07 2011

Set Up A Dns Server




set up a dns server

10 Things You Should Know About Securing Dns

1. Use DNS forwarders
A DNS forwarder is a DNS server that performs DNS queries on behalf of another DNS server. The primary reasons to use a DNS forwarder are to offload processing duties from the DNS server forwarding the query to the forwarder and to benefit from the potentially larger DNS cache on the DNS forwarder.

Another benefit of using a DNS forwarder is that it prevents the DNS server forwarding the requests from interacting with Internet DNS servers. This is especially important when your DNS server is Hosting your internal Domain DNS resource records. Instead of allowing your internal DNS servers to perform recursion and contacting DNS servers itself, configure the internal DNS server to use a forwarder for all Domains for which it is not authoritative.

2. Use caching-only DNS servers
A caching-only DNS server is one that is not authoritative for any DNS domains. It’s configured to perform recursion or use a forwarder. When the caching-only DNS server receives a response, it caches the result and returns the answer to the system issuing the DNS query to the caching-only DNS server. Over time, the caching-only DNS server can amass a large cache of DNS responses, which can significantly improve DNS response times for DNS clients of that caching-only DNS server.

Caching-only DNS servers can improve security for your organization when used as forwarders that are under your administrative control. Internal DNS servers can be configured to use the caching-only DNS server as their forwarders and the caching-only DNS server performs recursion on behalf of your internal DNS servers. Using your own caching-only DNS servers as forwarders improves security because you don’t have to depend on your ISP’s DNS servers as forwarders when you’re unsure of the security configuration of your ISP’s DNS servers.

3. Use DNS advertisers
A DNS advertiser is a DNS server that resolves queries for domains for which the DNS advertiser is authoritative. For example, if you Host publicly available resources for domain.com and corp.com, your public DNS server would be configured with DNS zone files for the domain.com and corp.com domains.

What sets the DNS advertiser apart from any other DNS Server Hosting DNS zone files is that the DNS advertiser answers queries only for domains for which it is authoritative. The DNS server will not perform recursion for queries to other DNS servers. This prevents users from using your public DNS server to resolve names in other domains. This increases security by lessening the risks associated with running a public DNS resolver, which include cache poisoning.

4. Use DNS resolvers
A DNS resolver is a DNS server that can perform recursion to resolve names for domains for which that DNS server is not authoritative. For example, you might have a DNS server on your internal network that’s authoritative for your internal network domain, internalcorp.com. When a client on your network uses that DNS server to resolve the name techrepublic.com, that DNS server performs recursion by querying other DNS servers to get the answer.

The difference between this DNS server and a DNS resolver is that a DNS resolver is a DNS server that is dedicated to resolving Internet host names. A resolver could be a caching-only DNS server that isn’t authoritative for any DNS domains. You can make the DNS resolver available to only your internal users, you can make it available only to your external users to provide a secure alternative to using a DNS server outside of your administrative control, or you can allow both internal and external users access to the DNS resolver.

5. Protect DNS from cache pollution
DNS cache pollution is an increasingly common problem. Most DNS servers are able to cache the results of DNS queries before forwarding the response to the host issuing the query. The DNS cache can significantly improve DNS query performance throughout your organization. The problem is that if the DNS server cache is “polluted” with bogus DNS entries, users can subsequently be forwarded to malicious Web sites instead of the sites they intended to visit.

Most DNS servers can be configured to prevent cache pollution. The Windows Server 2003 DNS server is configured to prevent cache pollution by default. If you’re using a Windows 2000 DNS server, you can configure it to prevent cache pollution by opening the Properties dialog box for the DNS server and clicking the Advanced tab. Select the Prevent Cache Pollution check box and restart the DNS server.

6. Enable DDNS for secure connections only
Many DNS servers accept dynamic updates. The dynamic update feature enables these DNS servers to register DNS host names and IP addresses for hosts that use DHCP for host IP addressing. DDNS can be a great boon in reducing the administrative overhead for DNS administrators who otherwise would need to manually configure DNS resource records for these hosts.

However, there can be a major security issue with DDNS updates if they are allowed unchecked. A malicious user can configure a host to dynamically update DNS host records of a file server, Web Server, or database server and have connections that should be destined to those servers diverted to his machine instead of the intended target.

You can reduce the risk of malicious DNS updates by requiring secure connections to the DNS server in order to perform the dynamic update. This is easily achieved by configuring your DNS server to use Active Directory integrated zones and requiring secure dynamic updates. All domain members will be able to dynamically update their DNS information in a secure context after you make this change.

7. Disable zone transfers
Zone transfers take place between primary and secondary DNS servers. Primary DNS servers that are authoritative for specific domains contain writable DNS zone files that are updated as needed. Secondary DNS servers received a read-only copy of these zone files from primary DNS servers. Secondary DNS servers are used to improved DNS query performance throughout an organization or over the Internet.

However, zone transfers are not limited to only secondary DNS servers. Anyone can issue a DNS query that will cause a DNS server configured to allow zone transfers to dump the entirety of its zone database files. Malicious users can use this information to reconnoiter the naming schema in your organization and attack key infrastructure services. You can prevent this by configuring your DNS servers to deny zone transfer requests or by configuring the DNS servers to allow zone transfers only to specific servers in the organization.

8. Use firewalls to control DNS access
Firewalls can be used to gain access control over who can connect to your DNS servers. For DNS servers that are used only for internal client queries, configure firewalls to block connections from external hosts to those DNS servers. For DNS servers used as caching-only forwarders, configure firewalls to allow DNS queries only from those DNS servers that use the caching-only forwarders. An especially important firewall policy setting is to block internal users from using the DNS protocol to connect to external DNS servers.

9. Set access controls on DNS registry entries
On Windows-based DNS servers, you should configure access controls on the DNS server-related Registry settings so that only the accounts that require access to them are allowed to read or change those Registry settings.

The HKLMCurrentControlSetServicesDNS key should be configured to allow only the Administrator and System account access, and these accounts should have Full Control permissions.

10. Set access control on DNS file system entries
On Windows-based DNS servers, you should configure access controls on the DNS server-related file system entries so that only the accounts that require access to them are allowed to read or change those files.

The %system_directory%DNS folder and subfolders should be configured to allow only the system account to access the files, and the system account should be given Full Control permissions

About the Author

Anuj Sharma(System Administrator)

http://www.winservers.co.in

How to configure DNS server ? Part 1


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The D-Link 4-Bay Network Storage Enclosure (DNS-343) is the perfect way to store, share, and safeguard your documents, music, videos, and photos. With the D-Link tool-less installation, you can easily insert up to 4 SATA drives1 without any tools or attaching any cables. Plus, the DNS-343 is a scalable solution, allowing you to start off with one SATA hard disk drive (HDD) and add up to 3 more as you grow. By supporting RAID 0, 1, 5, and JBOD, the DNS-343 gives you a variety of data protection options to help avoid data loss due to hard drive failure. RAID 0 combines all drives in a striped configuration, splitting data evenly across the hard drives to provide the highest performance. RAID 1 causes two drives to mirror each other, providing maximum protection. If there are four drives present, you can set up two separate RAID 1 partitions. If one drive fails, the unaffected drive in the partition will continue to operate normally. Once you replace the failed drive, RAID 1 mirroring will resume and both drives will mirror each other again. Advanced RAID 5 offers the highest performance with the most reliable data recovery in the case of a drive failure. RAID 5 technology uses a clever algorithm to distribute your data over 4 SATA hard disk drives and, in the case of a hard drive failure, the DNS-343 will continue to function with your data intact. With the included Memeo software, you can create schedules and rules including real-time full or incremental backups and storage quotas for specific users and groups. Using Memeo backup software, you can automatically back up your data onto the DNS-343, creating a failsafe protection solution from accidental data loss on your PC. The 4-Bay Network Storage Enclosure features an OLED to display important information including IP address, hard drive statistics, temperature, RAID status, and server status (FTP and UPnP). The USB port can act as a print server port, allowing a USB printer

 D-Link DNS-343 4-Bay Network Storage Enclosure


D-Link DNS-343 4-Bay Network Storage Enclosure


$519.99


The D-Link 4-Bay Network Storage Enclosure (DNS-343) is the perfect way to store, share, and safeguard your documents, music, videos, and photos. With the D-Link tool-less installation, you can easily insert up to 4 SATA drives1 without any tools or attaching any cables. Plus, the DNS-343 is a scalable solution, allowing you to start off with one SATA hard disk drive (HDD) and add up to 3 more as you grow. By supporting RAID 0, 1, 5, and JBOD, the DNS-343 gives you a variety of data protection options to help avoid data loss due to hard drive failure. RAID 0 combines all drives in a striped configuration, splitting data evenly across the hard drives to provide the highest performance. RAID 1 causes two drives to mirror each other, providing maximum protection. If there are four drives present, you can set up two separate RAID 1 partitions. If one drive fails, the unaffected drive in the partition will continue to operate normally. Once you replace the failed drive, RAID 1 mirroring will resume and both drives will mirror each other again. Advanced RAID 5 offers the highest performance with the most reliable data recovery in the case of a drive failure. RAID 5 technology uses a clever algorithm to distribute your data over 4 SATA hard disk drives and, in the case of a hard drive failure, the DNS-343 will continue to function with your data intact. With the included Memeo software, you can create schedules and rules including real-time full or incremental backups and storage quotas for specific users and groups. Using Memeo backup software, you can automatically back up your data onto the DNS-343, creating a failsafe protection solution from accidental data loss on your PC. The 4-Bay Network Storage Enclosure features an OLED to display important information including IP address, hard drive statistics, temperature, RAID status, and server status (FTP and UPnP). The USB port can act as a print server port, allowing a USB printer

 D-Link DNS-343 4-Bay Network Storage Enclosure (No Drives Included)


D-Link DNS-343 4-Bay Network Storage Enclosure (No Drives Included)


$459.99


The D-Link(r) 4-Bay Network Storage Enclosure (DNS-343) is the perfect way to store, share, and safeguard your documents, music, videos, and photos. With the D-Link tool-less installation, you can easily insert up to 4 SATA drives1 without any tools or attaching any cables. Plus, the DNS-343 is a scalable solution, allowing you to start off with one SATA hard disk drive (HDD) and add up to 3 more as you grow. PROTECTION, PERFORMANCE AND FLEXIBILITY By supporting RAID 0, 1, 5, and JBOD, the DNS-343 gives you a variety of data protection options to help avoid data loss due to hard drive failure. RAID 0 combines all drives in a ‘striped’ configuration, splitting data evenly across the hard drives to provide the highest performance. RAID 1 causes two drives to mirror each other, providing maximum protection. If there are four drives present, you can set up two separate RAID 1 partitions. If one drive fails, the unaffected drive in the partition will continue to operate normally. Once you replace the failed drive, RAID 1 mirroring will resume and both drives will mirror each other again. Advanced RAID 5 offers the highest performance with the most reliable data recovery in the case of a drive failure. RAID 5 technology uses a clever algorithm to distribute your data over 4 SATA hard disk drives and, in the case of a hard drive failure, the DNS-343 will continue to function with your data intact. SIMPLIFIED MANAGEMENT With the included backup software, you can create schedules and rules including real-time full or incremental backups and storage quotas for specific users and groups. Using backup software, you can automatically back up your data onto the DNS-343, creating a failsafe protection solution from accidental data loss on your PC. The 4-Bay Network Storage Enclosure features an OLED to display important information including IP address, hard drive statistics, temperature, RAID status, and server status (FTP and UPnP(tm)). USB PORT FUNCTIONALITY The USB port can…

 D-Link DNS-343 Network Storage Enclosure


D-Link DNS-343 Network Storage Enclosure


$351.66


The D-Link 4-Bay Network Storage Enclosure (DNS-343) is the perfect way to store, share, and safeguard your documents, music, videos, and photos. With the D-Link tool-less installation, you can easily insert up to 4 SATA drives without any tools or attaching any cables. Plus, the DNS-343 is a scalable solution, allowing you to start off with one SATA hard disk drive (HDD) and add up to 3 more as you grow.PROTECTION, PERFORMANCE AND FLEXIBILITYBy supporting RAID 0, 1, 5, and JBOD, the DNS-343 gives you a variety of data protection options to help avoid data loss due to hard drive failure. RAID 0 combines all drives in a striped configuration, splitting data evenly across the hard drives to provide the highest performance. RAID 1 causes two drives to mirror each other, providing maximum protection. If there are four drives present, you can set up two separate RAID 1 partitions. If one drive fails, the unaffected drive in the partition will continue to operate normally. Once you replace the failed drive, RAID 1 mirroring will resume and both drives will mirror each other again. Advanced RAID 5 offers the highest performance with the most reliable data recovery in the case of a drive failure. RAID 5 technology uses a clever algorithm to distribute your data over 4 SATA hard disk drives and, in the case of a hard drive failure, the DNS-343 will continue to function with your data intact.SIMPLIFIED MANAGEMENTWith the included backup software, you can create schedules and rules including real-time full or incremental backups and storage quotas for specific users and groups. Using backup software, you can automatically back up your data onto the DNS-343, creating a failsafe protection solution from accidental data loss on your PC. The 4-Bay Network Storage Enclosure features an OLED to display important information including IP address, hard drive statistics, temperature, RAID status, and server status (FTP and UPnP ).BR/

 D-Link NAS 2TB 4-Bay SATA Enclosure


D-Link NAS 2TB 4-Bay SATA Enclosure


$534.99


The D-Link(r) 4-Bay Network Storage Enclosure (DNS-343) is the perfect way to store, share, and safeguard your documents, music, videos, and photos. With the D-Link tool-less installation, you can easily insert up to 4 SATA drives1 without any tools or attaching any cables. Plus, the DNS-343 is a scalable solution, allowing you to start off with one SATA hard disk drive (HDD) and add up to 3 more as you grow. PROTECTION, PERFORMANCE AND FLEXIBILITY By supporting RAID 0, 1, 5, and JBOD, the DNS-343 gives you a variety of data protection options to help avoid data loss due to hard drive failure. RAID 0 combines all drives in a ‘striped’ configuration, splitting data evenly across the hard drives to provide the highest performance. RAID 1 causes two drives to mirror each other, providing maximum protection. If there are four drives present, you can set up two separate RAID 1 partitions. If one drive fails, the unaffected drive in the partition will continue to operate normally. Once you replace the failed drive, RAID 1 mirroring will resume and both drives will mirror each other again. Advanced RAID 5 offers the highest performance with the most reliable data recovery in the case of a drive failure. RAID 5 technology uses a clever algorithm to distribute your data over 4 SATA hard disk drives and, in the case of a hard drive failure, the DNS-343 will continue to function with your data intact. Learn more about D-Link Green Technology SIMPLIFIED MANAGEMENT With the included backup software, you can create schedules and rules including real-time full or incremental backups and storage quotas for specific users and groups. Using backup software, you can automatically back up your data onto the DNS-343, creating a failsafe protection solution from accidental data loss on your PC. The 4-Bay Network Storage Enclosure features an OLED to display important information including IP address, hard drive statistics, temperature, RAID status, and server status (FTP and UPnP(tm))…

 Edimax Outdoor IP Camera w/ Night Vision


Edimax Outdoor IP Camera w/ Night Vision


$188.36


Features Accesses the camera easily from Internet through the utility without DDNS setting Supports 3GPP/ISMA Dual video streaming for PCs and mobile devices with separate frame rate/resolution/bandwidth settings. IR LED control includes support automatic, manual and scheduled modes. Supports enhanced MPEG-4 compression Supports resolution of up to 640×480 pixels at 30 fps Supports Motion Detection and E-mail/FTP notification Built-in Web server for managing via standard web browser Able to trigger the email/ftp sending in the scheduled time period when the video motion is detected Integrates NAS as a NVR Supports Watchdog based on hardware timing device that triggers the IP Cam resets if the main program hangs The IC-9000 is designed with the “user-friendly” concept. You can install the IP Camera easily on your home network and then access the IP Camera anywhere in the world with the video management utility. No need to set complicated DNS name or change the router’s configuration. It’s just a plug & play. With video management utility and 3GPP/ISMA support, the IC-9000 allows you to view the real-time video from the IC-9000 on the most 3G mobile phones* anywhere and anytime without fixed IP address setting. With the low light sensitive sensor and IR LEDs inside the IP66-rated water proof housing, the IC-9000 can satisfy all security and indoor/outdoor surveillance needs even in the dim environment or bad weather condition. Besides, with the automatic ICR (IR Cutter Remover), the infrared light is filtered out during the day time and is allowed to pass during the night time. This ensures the video colour quality is excellent compared with other IP cameras. For outdoor surveillance and remote monitoring, the IC-9000 provides the best image quality in its class, and excellent performance. Its efficient bandwidth management offers 640×480 resolution, 30 fps frame rate, real MPEG4 image compression ability. The IC-9000 provides motion detection f

 IP Video 9100A Plus Network Video Server (Black) - Broadcast Video over the Web without a PC!


IP Video 9100A Plus Network Video Server (Black) – Broadcast Video over the Web without a PC!


$74.99


IP Video 9100A Plus Network Video Server General Features: Black color Embedded web server 10/100Mbps Fast Ethernet Network Access(RJ-45 Jack) Immediate access to remote locations Monitoring up to 9 locations at the same time Supports multiple video in 4 different sources with one set of IP address Supports MSN & Yahoo Messenger Audio input and transfer online No need to plug to PC, simply plug to an Internet line and start observing Browser by Internet: I 5.0 or higher, Netscape, & Mozilla FireFox Video Layout: – 1 x 1/2 x 2/3 x 3/4 x 4 Supports High/Low video layout quality level Supported Resolutions: True 640 x 480 352 x 288 320 x 240 176 x 144 Supported Network Protocols: HTTP TCP/IP UDP RARP PING DNS ARP DHCP DDNS PPPoe Color Setup: Brightness Contrast Hue Saturation Motion Detection Features: Three senstivity level Mail the detected images to preset email address Save the detected images to preset FTP server Motion detection: save as JPG/AVI files Capture video motion up to 30 fps Connectors: Four (4) video inputs RJ-45 jack 3.5 mm Audio in jack On/Off Switch Reset 5V DC jack Unit Dimensions: 1.25 x 4 x 2.25-inches (H x W x D) Regulatory Approvals: FCC CE RoHS compliant

 Linux Administration : A Beginner's Guide, Fifth Edition by Wale  Soyinka


Linux Administration : A Beginner’s Guide, Fifth Edition by Wale Soyinka


$39.99


4+~~Iceberg Reader~~ScrollMotion, Inc~~http://itunes.apple.com/app/linux-administration-a-beginners/id370571536?uo=5~~Copyright ScrollMotion 2009~~3.0.3~~2679891~~14878957~~http://www.scrollmotion.com/icebergreader/~~http://www.scrollmotion.com/icebergreader/

 Microsoft® Windows Server™ 2003 Administrator's Companion, Second Edition


Microsoft® Windows Server™ 2003 Administrator’s Companion, Second Edition


$7.99


4+~~O’Reilly Media, Inc.~~O’Reilly Media, Inc~~http://itunes.apple.com/app/microsoft-windows-server-2003/id363745923?uo=5~~Charlie Russell (All); Sharon Crawford (All)~~1.0~~2469592~~20163370~~http://oreilly.com/catalog/9780735620476/~~http://oreilly.com/contact.html

 Networking for Dummies


Networking for Dummies


$1.32


Covers Windows XP SP2, Mac OS X, broadband, and more! Here’s how to set up a network or live with the one you already have Are you tired of waiting in line for the computer that’s connected to the database? Want to print to that cool laser printer down the hall? With a network and this book to help, you can! Soon you’ll be sharing printers and files, understanding servers, managing security, and laughing at all the stuff you thought was scary. Discover How To: Understand different types of servers Share files, programs, and peripherals Work with peer-to-peer networks Manage network security Configure a wireless access point Set up a DNS server

 Practical Guide to Ubuntu Linux, A


Practical Guide to Ubuntu Linux, A


$39.99


The Most Complete, Easy-to-Follow Guide to Ubuntu Linux 10.4 LTS (Lucid Lynx) The #1 Ubuntu server resource, fully updated for Ubuntu 10.4 (Lucid Lynx)-the Long Term Support (LTS) release many companies will rely on for years! Updated JumpStarts help you set up Samba, Apache, Mail, FTP, NIS, OpenSSH, DNS, and other complex servers in minutes Hundreds of up-to-date examples, plus comprehensive indexes that deliver instant access to answers you can trust Mark Sobell’s A Practical Guide to Ubun

 Practical Guide to Ubuntu Linux, A,


Practical Guide to Ubuntu Linux, A,


$31.99


The Most Complete, Easy-to-Follow Guide to Ubuntu Linux The #1 Ubuntu server resource, fully updated for Ubuntu 10.4 (Lucid Lynx)–the Long Term Support (LTS) release many companies will rely on for years! Updated JumpStarts help you set up Samba, Apache, Mail, FTP, NIS, OpenSSH, DNS, and other complex servers in minutes Hundreds of up-to-date examples, plus comprehensive indexes that deliver instant access to answers you can trust Mark Sobell’s A Practical Guide to Ubuntu Linuxr, T

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