Thursday, October 16, 2008
How to Configure Windows 2008 DHCP Server to Perform Dynamic DNS Updates
By default, a Windows Server 2008 DHCP server automatically updates A and PTR records for DHCP clients that request a dynamic DNS update.
To Configure Your DHCP Server to Perform Dynamic DNS Updates
1. In Server Manager, expand Roles, and then expand DHCP Server.
2. Expand the server name, right-click IPv4, and then click Properties.
3. Click the DNS tab. Select Enable DNS Dynamic Updates According To The Settings Below.
4. To allow the DHCP server to remove resource records after a DHCP lease expires, select the Discard A And PTR Records When A Lease Is Deleted check box.
5. To perform dynamic DNS updates for client computers that are not capable of performing their own updates, select the Dynamically Update DNS A And PTR Records For DHCP Clients That Do Not Request Updates check box. Windows 2000 and all later versions of Windows can perform their own dynamic DNS updates. Click OK.
To Configure Your DHCP Server to Perform Dynamic DNS Updates
1. In Server Manager, expand Roles, and then expand DHCP Server.
2. Expand the server name, right-click IPv4, and then click Properties.
3. Click the DNS tab. Select Enable DNS Dynamic Updates According To The Settings Below.
4. To allow the DHCP server to remove resource records after a DHCP lease expires, select the Discard A And PTR Records When A Lease Is Deleted check box.
5. To perform dynamic DNS updates for client computers that are not capable of performing their own updates, select the Dynamically Update DNS A And PTR Records For DHCP Clients That Do Not Request Updates check box. Windows 2000 and all later versions of Windows can perform their own dynamic DNS updates. Click OK.
Wednesday, April 9, 2008
Cisco, Juniper face-off on software
By Jim Duffy
Network World, 06/12/00
SANTA CLARA - Speeds and feeds are not all that matters when building reliable routers for the Internet core.
Indeed, the software component of these high-speed devices may play an even larger role in ensuring that packets and sessions are not dropped. That's why Cisco is building more resiliency and redundancy into its next generation IOS software. That's also why Juniper Networks plays up the reliability of its Junos operating system.
And perhaps that's why these two rivals try to point out the deficiencies of each others' software offerings. Although Cisco has been around a lot longer than Juniper, both companies are courting the same customers in the service provider market, where Cisco is a relative newcomer.
"Juniper continues to eat away at Cisco's leading market share - which is still in the 70% range - and this trend should continue," market researcher Current Analysis stated in a recent report.
"Our broader strength is our six major releases in 18 months," says Scott Kriens, Juniper CEO, commenting on Junos. "We can deliver innovation faster than anyone else. It's that accumulated breadth that is our competitive advantage."
Eighteen months pales in comparison to 15 years, which is how long Cisco has been developing and selling IOS.
"We are the market share leader from a control plane perspective," says Martin McNealis, marketing manager in Cisco's IOS Technologies division, referring to the Multi-protocol Label Switching, VPN, voice and multicast features of the Cisco software. "We're not hearing service providers hammer the table saying we need to have [certain features] because [Juniper] has it."
It's neither Juniper nor Junos that's prompting Cisco to build more resiliency, availability and redundancy into the next major release of IOS. IOS will feature "more intelligent" handling of outages and service upgrades, McNealis says.
"We're now looking to deliver a bulletproof architecture," McNealis says. "Now that we're a systems company, we have to accept that there will be hardware and software failures."
Cisco is building stateful redundancy into IOS whereby information on the state of routes, sessions or packets can be replicated within a router chassis. Currently, Cisco offers redundancy between two distinct routers via the Hot Standby Routing Protocol in IOS.
Juniper refers to this version of IOS as IOS NG, with NG standing for "Next Generation." IOS NG is Cisco's attempt to be more competitive with Junos by having a more modular architecture and being tailored specifically for service providers, Kriens says.
Juniper's definition of modular means separate processes - such as routing protocols, management and security - each run in protected memory. Currently, IOS is "monolithic," Kriens says, meaning all processes run together and are interdependent.
"It's kind of comparing Windows with DOS," Kriens says, noting the modular nature of Windows vs. the monolithic nature of DOS.
Perhaps it's best to compare an operating system that was built from the ground up to perform routing vs. one that has its roots in a general purpose operating system such as Berkeley Sockets - the precursor to Unix - but has been modified to do routing, says Cisco's McNealis. IOS is the former while Junos is the latter.
"IOS was always tailored for infrastructure," McNealis says. "It's very network-centric. It's control plane and data plane optimization vs. a general-purpose operating system. You do make some compromises when it has to be that portable."
Juniper selected Berkeley Sockets as the source code for Junos because it was readily available in the public domain, Kriens says. But JUNOS represents 4 years and 300 to 400 man years of development on top of that Berkeley Sockets source code, he says.
"Any resemblance [to Berkeley Sockets] would be so remote as to be irrelevant," Kriens says.
Network World, 06/12/00
SANTA CLARA - Speeds and feeds are not all that matters when building reliable routers for the Internet core.
Indeed, the software component of these high-speed devices may play an even larger role in ensuring that packets and sessions are not dropped. That's why Cisco is building more resiliency and redundancy into its next generation IOS software. That's also why Juniper Networks plays up the reliability of its Junos operating system.
And perhaps that's why these two rivals try to point out the deficiencies of each others' software offerings. Although Cisco has been around a lot longer than Juniper, both companies are courting the same customers in the service provider market, where Cisco is a relative newcomer.
"Juniper continues to eat away at Cisco's leading market share - which is still in the 70% range - and this trend should continue," market researcher Current Analysis stated in a recent report.
"Our broader strength is our six major releases in 18 months," says Scott Kriens, Juniper CEO, commenting on Junos. "We can deliver innovation faster than anyone else. It's that accumulated breadth that is our competitive advantage."
Eighteen months pales in comparison to 15 years, which is how long Cisco has been developing and selling IOS.
"We are the market share leader from a control plane perspective," says Martin McNealis, marketing manager in Cisco's IOS Technologies division, referring to the Multi-protocol Label Switching, VPN, voice and multicast features of the Cisco software. "We're not hearing service providers hammer the table saying we need to have [certain features] because [Juniper] has it."
It's neither Juniper nor Junos that's prompting Cisco to build more resiliency, availability and redundancy into the next major release of IOS. IOS will feature "more intelligent" handling of outages and service upgrades, McNealis says.
"We're now looking to deliver a bulletproof architecture," McNealis says. "Now that we're a systems company, we have to accept that there will be hardware and software failures."
Cisco is building stateful redundancy into IOS whereby information on the state of routes, sessions or packets can be replicated within a router chassis. Currently, Cisco offers redundancy between two distinct routers via the Hot Standby Routing Protocol in IOS.
Juniper refers to this version of IOS as IOS NG, with NG standing for "Next Generation." IOS NG is Cisco's attempt to be more competitive with Junos by having a more modular architecture and being tailored specifically for service providers, Kriens says.
Juniper's definition of modular means separate processes - such as routing protocols, management and security - each run in protected memory. Currently, IOS is "monolithic," Kriens says, meaning all processes run together and are interdependent.
"It's kind of comparing Windows with DOS," Kriens says, noting the modular nature of Windows vs. the monolithic nature of DOS.
Perhaps it's best to compare an operating system that was built from the ground up to perform routing vs. one that has its roots in a general purpose operating system such as Berkeley Sockets - the precursor to Unix - but has been modified to do routing, says Cisco's McNealis. IOS is the former while Junos is the latter.
"IOS was always tailored for infrastructure," McNealis says. "It's very network-centric. It's control plane and data plane optimization vs. a general-purpose operating system. You do make some compromises when it has to be that portable."
Juniper selected Berkeley Sockets as the source code for Junos because it was readily available in the public domain, Kriens says. But JUNOS represents 4 years and 300 to 400 man years of development on top of that Berkeley Sockets source code, he says.
"Any resemblance [to Berkeley Sockets] would be so remote as to be irrelevant," Kriens says.
Cisco, Juniper face-off on software
By Jim Duffy
Network World, 06/12/00
SANTA CLARA - Speeds and feeds are not all that matters when building reliable routers for the Internet core.
Indeed, the software component of these high-speed devices may play an even larger role in ensuring that packets and sessions are not dropped. That's why Cisco is building more resiliency and redundancy into its next generation IOS software. That's also why Juniper Networks plays up the reliability of its Junos operating system.
Network World, 06/12/00
SANTA CLARA - Speeds and feeds are not all that matters when building reliable routers for the Internet core.
Indeed, the software component of these high-speed devices may play an even larger role in ensuring that packets and sessions are not dropped. That's why Cisco is building more resiliency and redundancy into its next generation IOS software. That's also why Juniper Networks plays up the reliability of its Junos operating system.
Sunday, February 17, 2008
Virtualisation gets a leg up
OPEN-SOURCE solutions provider Red Hat recently announced its Integrated Virtualisation Inside campaign that aims to encourage the use of virtualisation technology among open-source software users.
The company said virtualisation will become more mainstream as enterprises look for ways to boost productivity and performance of its IT infrastructures.
“The problem with most applications is that they run on specific operating systems and are hardcoded into the hardware making it difficult to deploy,” said Red Hat Asia Pacific Pte Ltd general manager for Asean, Teong Eng Guan.
“Virtualisation will allow enterprises to run their applications on multiple operating systems while enabling them to run on virtual servers.
“So instead of running one application per server, enterprises can save on electricity and real estate by running them on one server,” he said.
Red Hat’s virtualisation capability is integrated into its Red Hat Enterprise Linux 5 operating system.
Red Hat virtualisation will run on most desktop and server platforms including Intel Xeon and Itanium, AMD Opteron and IBM Power systems, Teong said
Source: The Star (Malaysia)
Malaysian Government should support an open source solution for future implementation.
Juniper offers new switches
NETWORKING equipment vendor Juniper Networks Malaysia has unveiled its EX series of enterprise-class Ethernet switches – the EX 3200, 4200 and 8200.
Juniper believes the new series will allow it to compete more effectively in the crowded enterprise networking segment of the market.
“Enterprises are demanding more than what has been offered by traditional switching vendors,” said Juniper Networks Malaysia country manager Wan Ahmad Kamal. “They want performance, reliability and simplicity in a switching solution.”
He said the problem in a typical networking environment is that it is highly complex, thanks to different versions of software running on various brands of equipment.
This, he said, makes it difficult to manage and upgrade networks.
Juniper’s solution to the problem is its Junos software, which is included in the EX series. It is a single-source network operating system that simplifies operations and integrates business applications across the network, the company said.
“Aside from wanting simplicity in a network, enterprises are getting increasingly concerned about system security,” Wan Ahmad added. “The new switches will fully integrate with Juniper’s Unified Access Control solution, which allows administrators to enforce access control and security down to individual ports and users.”
The EX 3200 and EX 4200 switches will be available from next month while the EX 8200 will only be available in the second half of the year. No local pricing has been announced yet.
Juniper believes the new series will allow it to compete more effectively in the crowded enterprise networking segment of the market.
“Enterprises are demanding more than what has been offered by traditional switching vendors,” said Juniper Networks Malaysia country manager Wan Ahmad Kamal. “They want performance, reliability and simplicity in a switching solution.”
He said the problem in a typical networking environment is that it is highly complex, thanks to different versions of software running on various brands of equipment.
This, he said, makes it difficult to manage and upgrade networks.
Juniper’s solution to the problem is its Junos software, which is included in the EX series. It is a single-source network operating system that simplifies operations and integrates business applications across the network, the company said.
“Aside from wanting simplicity in a network, enterprises are getting increasingly concerned about system security,” Wan Ahmad added. “The new switches will fully integrate with Juniper’s Unified Access Control solution, which allows administrators to enforce access control and security down to individual ports and users.”
The EX 3200 and EX 4200 switches will be available from next month while the EX 8200 will only be available in the second half of the year. No local pricing has been announced yet.
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