Need some advice on learning networking

[BillyCarpenter]

Re: Need some advice on learning networking

Let's see if we can get some discussion going on:

Static vs. DHCP Reservation

There's only certain things we want to have static IP addresses: Servers, routers, switches, printers, storage devices and PC that are hosting any type of services. What else?


What are the advantages of DHCP reservations as opposed to static? I have some thoughts but I'll see if anyone else weighs in.

[slimslob]

Re: Need some advice on learning networking

Let's see if we can get some discussion going on:

Static vs. DHCP Reservation

There's only certain things we want to have static IP addresses: Servers, routers, switches, printers, storage devices and PC that are hosting any type of services. What else?


What are the advantages of DHCP reservations as opposed to static? I have some thoughts but I'll see if anyone else weighs in.

Corporate officers who need to be able to access the fie servers, printers, internet and other Static IP devices as much as possible. I got a call one afternoon from a local VP at a major oil field ser4vice client. It seemed that about half the people in the warehouse office could not print. It only took me a couple of minutes to realize that the computers that had been turned off over night did not get DHCP when they turned on. I called the receptionist to have her contact the local IT person to have him call me so I could tell him what I had found. She called back to tell me that he was too busy to talk to me trying to determine what router(s) were preventing some people from accessing anything. Apparently she then called the West Coast IT office in Seattle because he called me to as what I had found. I told him "no DHCP." Five minutes the receptionist did an announcement for everyone having trouble to reboot their computers. The local "IT" person's severance check was waiting for him when he clocked out that afternoon.

[BillyCarpenter]

Re: Need some advice on learning networking

Corporate officers who need to be able to access the fie servers, printers, internet and other Static IP devices as much as possible. I got a call one afternoon from a local VP at a major oil field ser4vice client. It seemed that about half the people in the warehouse office could not print. It only took me a couple of minutes to realize that the computers that had been turned off over night did not get DHCP when they turned on. I called the receptionist to have her contact the local IT person to have him call me so I could tell him what I had found. She called back to tell me that he was too busy to talk to me trying to determine what router(s) were preventing some people from accessing anything. Apparently she then called the West Coast IT office in Seattle because he called me to as what I had found. I told him "no DHCP." Five minutes the receptionist did an announcement for everyone having trouble to reboot their computers. The local "IT" person's severance check was waiting for him when he clocked out that afternoon.

Here's one example of an advantage to using DHCP reservation.


Many times the IT guy is managing devices that are at remote locations. That could be another building on a campus or that could be a location in another city/state. It's very easy to make a mistake when assigning a static IP address to a bunch of devices. Suppose the IT person enters the wrong subnet and loses connectivity to a device? What then? He's gonna have to get in his car and drive to the location of the device and change the subnet?

But what if he would have given the device a DHCP reservation? Then if he made a mistake all he would have to do is change the DHCP configuration and the device would get the corrected configuration.

[BillyCarpenter]

Re: Need some advice on learning networking

This explanation is more clear and to the point:

DHCP Reservations

[bsm2]

Re: Need some advice on learning networking

Welcome to the world of networking Duh
Most companies don't use DHCP Reservations only enterprise size companies and it's still rare to see it used.

There are other ways to find devices on the your network lets see if you can figure that out

[BillyCarpenter]

Re: Need some advice on learning networking

Welcome to the world of networking Duh
Most companies don't use DHCP Reservations only enterprise size companies and it's still rare to see it used.

There are other ways to find devices on the your network lets see if you can figure that out

Calm down before you have a heart attack. In a minute I'm gonna talk about some of the shortcomings of DHCP Reservations when using IPv4 and how IPv6 overcomes those shortcomings. Here's a hint:

Reservations IPv6 DHCP
To get around this, IPv6 uses two different values. The first is the DHCP unique identifier or DUID. This value is a unique value given to all DHCP clients and servers on the network. Just like a serial number, every DHCP client and DHCP server has a different DUID

[BillyCarpenter]

Re: Need some advice on learning networking

This journey I've taken with networking has been a strange and fun ride thus far. It started out with Ken, slim and others explaining the most basic of networking concepts to me because I knew almost nothing.

But then I decided to study for my CCNA. That's a whole other world. I poured my heart and soul into it for a few months but I had to take a break for my own sanity. Trust me when I tell you that it's a hard and grueling study.

While I took a break from CCNA, I decided to learn more about Server 2019. Hell, I even bought a Dell PowerEdge R620 Server.

The worlds of Windows Server and CCNA are vastly different. Windows Server is much more fun. Routing and switching is fun, too, in a weird sort of way.

While my brief experience with Windows Server was fun and I learned a lot, it's time to get back to CCNA. At some point I'm gonna come back to Windows Server because I love it. However, I don't like starting something and not finishing it. I've invested way too much time and energy in CCNA to stop now....even though I know this knowledge is something that I'll likely never use.

Back to the grind.

[slimslob]

Re: Need some advice on learning networking

Here's one example of an advantage to using DHCP reservation.


Many times the IT guy is managing devices that are at remote locations. That could be another building on a campus or that could be a location in another city/state. It's very easy to make a mistake when assigning a static IP address to a bunch of devices. Suppose the IT person enters the wrong subnet and loses connectivity to a device? What then? He's gonna have to get in his car and drive to the location of the device and change the subnet?

But what if he would have given the device a DHCP reservation? Then if he made a mistake all he would have to do is change the DHCP configuration and the device would get the corrected configuration.

But if the DHCP server is down when the computer powers up? Go ahead and make the reservation but set an Alternate Configuration with the same IP Address for when DHCP cannot be obtained.

[BillyCarpenter]

Re: Need some advice on learning networking

But if the DHCP server is down when the computer powers up? Go ahead and make the reservation but set an Alternate Configuration with the same IP Address for when DHCP cannot be obtained.

Yes, sir. That is one downside to DHCP reservations. Another downside is that DHCP Reservations are married to the MAC Address that resides on the NIC card. If the NIC is replaced then there's a problem if changes aren't made on the server side.


I've been reading up on DHCP Reservations using IPv6 and a lot problems associated with IPv4 are not an issue because it doesn't use the MAC address.

[tsbservice]

Re: Need some advice on learning networking

Yes, sir. That is one downside to DHCP reservations. Another downside is that DHCP Reservations are married to the MAC Address that resides on the NIC card. If the NIC is replaced then there's a problem if changes aren't made on the server side.


I've been reading up on DHCP Reservations using IPv6 and a lot problems associated with IPv4 are not an issue because it doesn't use the MAC address.

IPv6 I tend to disable it on MFP side Just another unused protocol...well maybe future would prove me wrong but for now less not needed protocols less grief.

[KenB]

Re: Need some advice on learning networking

IPv6 I tend to disable it on MFP side Just another unused protocol...well maybe future would prove me wrong but for now less not needed protocols less grief.

[BillyCarpenter]

Re: Need some advice on learning networking

IPv6 I tend to disable it on MFP side Just another unused protocol...well maybe future would prove me wrong but for now less not needed protocols less grief.

I hear ya, tsb. I disable the hell out of it, too.

But I don't know how much longer we'll be able to avoid it. I'm trying to learn something about so I won't be caught flat-footed, so to speak. If IPv6 ever does go mainstream, I think a lot of folks will be caught off guard. Also, it's part of my CCNA course.

[BillyCarpenter]

Re: Need some advice on learning networking

Also, IPv6 is more secure and with what's going on lately, I wouldn't be surprised if we start seeing IPv6.

This is an interesting artilce:

ITU News caught up with Latif Ladid, Senior Researcher at the University of Luxembourg and President of the IPv6 Forum, to gain fresh insight into the status and importance of the transition from IPv4 to its successor Internet Protocol, IPv6.

Could you offer us a snapshot of IPv6 deployment as it stands today?
IPv6 is used today by over 1 billion users around the world without even knowing it. Some countries are reaching 60 per cent IPv6 penetration. The remaining 40 per cent lies in the hands of the enterprise world to fullfil the complete adoption of IPv6 for the ultimate switch to IPv6-Only Internet, allowing thereby the deprecation of the IPv4 Internet as recommended by the U.S. government’s Office of Management and Budget.

]IPv6 is booming in Asia. India is leading with over 350 million IPv6 users. China, as number two, has more than 200 million IPv6 users and China has an IPv6 policy to reach 100 per cent deployment. The IPv6 penetration shows that some countries that were not leaders in the IPv4 Internet have adopted IPv6 even earlier than some countries in Europe. This shows that new technologies allow some developing countries to leap-frog into the new world. IPv6 has clearly demonstrated the leap-frog concept, which was one of the goals of the IPv6 Forum from day one.

]This enables reducing the maintenance of two Internets. The management of the enterprises should look at reducing CAPEX and OPEX by looking at the examples of the top Internet technology enterprises that have already implemented IPv6-Only in-house. IPv6 is a crucial networking and interoperability piece for real Internet of Things, Cloud Computing, Big Data, 4G and 5G, to name a few. The 5G world will move to IPv6-Only, as announced by some early deployers of 5G such as T-Mobile in the U.S.

What are some of the industry sectors with the most to gain from IPv6?

Basically by moving to IPv6-Only Internet by 2025, all industry sectors will have to be on par with the Internet industry. There are obviously first movers, especially the Mobile Network Operators (MNOs) that could not get large amounts of IPv4 address space such as Reliance Jio in India which has deployed 4G with IPv6-Only and has some 250 million IPv6 users. Now, the verticals that will move to 5G will automatically get IPv6 support out of the box with 5G. The most prominent verticals working on its standards at 3GPP are the 3GPP Market Representation Partners such as 5G-AA for the automotive industry, 5G-ACIA for connected industries and automation, and PSC Europe for public safety communications, to name a few. There are also sectors in energy such as metering where large IPv6 projects have been deployed, such as in the Vancouver electricity company for 3 million houses.

What are some of the challenges facing IPv6 adoption, particularly in developing countries, and how are these challenges best overcome?
The first challenge is capacity building in developing countries. AFRINIC, the registry for Africa, has been doing a lot of trainings to Internet Service Providers’ (ISPs) engineers. We have seen some examples of rapid IPv6 deployment, in companies such as Etisalat and Liquid Telecom, but in most cases the top management of ISPs and MNOs need to plan a slow and smart transition to IPv6, not waiting for a fork-lift upgrade which they cannot afford, but rather updating their hardware and software to the latest version as they buy or add new equipment to their networks. This needs planning and it is the cheapest solution. The Internet is growing in Africa and this should be an urgent issue for management in any case.

In 2010, IPv6 Forum initiated an IPv6 Education and Certification Program in cooperation with Cisco and later the University of Malaysia (MUST) under the leadership of Prof. Sures Ramadass to establish Authorised Training Partners to deliver IPv6 Courses at all levels to engineers around the world. The program achieved great success, certifying over 10,000 IPv6 engineers. MUST has established a Center with ITU called the ITU-MUST IPv6 and IoT Expertise Center.[/COLOR]
[COLOR=rgba(0, 0, 0, 0.87)]In some countries like Morocco and Tunisia, the regulators (ARNT and ATI) have taken the initiative to create a roadmap for the country and get the government and all stakeholders to be involved in this process. I highlighted the value of such initiatives in my discussion paper for ITU’s Global Symposium for Regulators in Warsaw in 2013.

Who were the notable early adopters of IPv6, and who are notable adopters today?

The early adopters were basically the real Internet companies such as Google, Facebook, YouTube and Microsoft. They deployed IPv6 across their entire networks worldwide, then they were followed by many ISPs and MNOs. The list of these companies can be found on this web page with the proper IPv6 penetration in their networks, with some achieving penetration beyond 90 per cent. 4G networks are adopting IPv6 in large scale. The U.S. government has been doing large-scale IPv6 deployment with a non-funded mandate. Now the U.S. government’s Office of Management and Budget is calling for deployment of IPv6-Only by 2025. Germany was the second country to deploy IPv6 in larger scale with a massive government-led project. I would encourage each government to take the lead as it is the biggest customer in its country and can drive the ISPs and other industry players with its purchasing power.

What are your predictions for IPv6 over the 2020 to 2030 timeframe and beyond?

We are today running two Internets: an IPv4 Internet and an IPv6 Internet. With the experience collected over the past two decades, it is abundantly clear that it does not make any more sense to run two Internets at the same time: an aging and broken IPv4 Internet and a new and fresh IPv6 Internet in parallel. IPv6 was designed as a clean slate approach to the Internet – designed not to be not be compatible with IPv4 so that we can divorce it from IPv4 without any pain and get rid of IPv4 complexity and many aging inefficiencies – although IPv4 is still working and can work forever, which is undoubtedly the beauty of the Internet Protocols. But it’s time for a refresh! Quoting Vint Cerf from his speech at Globecom 2019 in Hawaii, on the question of what protocol he would have chosen back in the 70s, “IPv6” was his reply.

[slimslob]

Re: Need some advice on learning networking

I hear ya, tsb. I disable the hell out of it, too.

But I don't know how much longer we'll be able to avoid it. I'm trying to learn something about so I won't be caught flat-footed, so to speak. If IPv6 ever does go mainstream, I think a lot of folks will be caught off guard. Also, it's part of my CCNA course.

I have a feeling that when it does Microsoft's next major Windows update will turn it on for us as will firmware updates for all current production MFP.

[rthonpm]

Re: Need some advice on learning networking

I have a feeling that when it does Microsoft's next major Windows update will turn it on for us as will firmware updates for all current production MFP.

IPv6 has been the default connection method in Windows since Windows 8.

I see a good amount of v6 connectivity with some of my larger customers, and we have a v6 range set up in our office as well. I haven't had a big opportunity to try playing around with it other than creating the scope on our internal DHCP server.

The biggest issue I've found with it is in customers who don't have their own IP range for it. Even with small AD networks it can break connectivity to the domain if the network pulls v6 from the ISP instead of an internal source.

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