?
Solved

Backup DHCP Server

Posted on 2016-11-07
8
Medium Priority
?
163 Views
Last Modified: 2016-11-07
Hi Guys,
Currently, I have one server room, we are going to install a second server room at the back of a large building. The main reason for this is, in the event of a fire, we will have a copy of the sql server so we can resume business. all the office pc (2 dozen) will be physically uplugged from the primary network into secondary network.

Since the two database servers will be connected via fiber optics approx 300 feet away, should 1 use a failover DHCP or a seperate DHCP?

You're help is greatly appreciated.
0
Comment
Question by:S Khan
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
  • 3
8 Comments
 
LVL 96

Expert Comment

by:Lee W, MVP
ID: 41877979
If it's on the same network, use a split scope - half your DHCP addresses are handed out by each server.  If one does down, the other can handle all of the network.  Otherwise, whichever DHCP server answers first provides the address
0
 

Author Comment

by:S Khan
ID: 41877991
Hi Lee, in the event of a fire all the cables will be burnt, so the office pc's will be severed,  so i will be running a separate network. my main focus is to have a backup of the entire database.  I would have to physically connect the office pc to the backup DHCP server.
Do i replicate the DHCP or have a seperate one?

Here is the flow of the primary room
WAN>SonicWALL>DHCP>SQL

Here is the flow of the backup room
Backup WAN > SonicWALL>DHCP>SQL etc.
0
 
LVL 96

Expert Comment

by:Lee W, MVP
ID: 41877997
I'm confused - WHY would you run a separate network?  Just have redundant services in two locations - or use Hyper-V replica.  Ditch the sonicwall and use a VM based solution (I prefer Untangle, but PFSense and other third party systems exist that can run as a VM - and since they are running as a VM you can fail them over.
0
Does Your Cloud Backup Use Blockchain Technology?

Blockchain technology has already revolutionized finance thanks to Bitcoin. Now it's disrupting other areas, including the realm of data protection. Learn how blockchain is now being used to authenticate backup files and keep them safe from hackers.

 
LVL 19

Expert Comment

by:Mal Osborne
ID: 41878009
I would not use a second DHCP server. When a Windows machine boots, with an existing DHCP lease it attempts to ping the default gateway, and if it can, keeps using that lease. The default Windows DHCP lease is 8 days, leases are renewed once half expired, so clients will be fine with no DHCP server for 4 days.  You could even extend the lease time, maybe to 30 days, giving you 2 weeks grace.

Longer leases can be a problem f you have a lot of devices intermittently in use and not a lot of spare IP addresses. If for instance, a visitor plugs in a laptop, and it gets a lease, that IP cannot be used for 8 days. It is possible to therefore run out of IP addresses.
0
 

Author Comment

by:S Khan
ID: 41878013
In a fire we will loose the entire room, WAN, SonicWALL, Switches. firewall etc, The only thing that remain is a burn out Ethernet cable.
We are planning for worst case scenario.
0
 

Author Comment

by:S Khan
ID: 41878015
also the backup DHCP will be using another gateway.
0
 
LVL 96

Accepted Solution

by:
Lee W, MVP earned 2000 total points
ID: 41878024
In a fire we will loose the entire room, WAN, SonicWALL, Switches. firewall etc, The only thing that remain is a burn out Ethernet cable.
We are planning for worst case scenario.

OK, so I'll repeat...  WHY would you run a separate network?

You don't need a separate network.  If you are convinced that the entire building won't be affected, but just want redundancy, KEEP the same logical network.  There's no reason you've presented that says you can't.

Is there a reason you're not virtualizing?  If you are, is there are a reason you're not replicating?

What your describing sounds like what an inexperienced person might try to design for a disaster - but there are FAR better and less complex ways of doing this.

BTW, the worst case scenario is the entire building burns down.  In which case you need OFF-SITE redundancy - again, something replica can do!
0
 

Author Comment

by:S Khan
ID: 41878042
Actually you're right, same network, different location with a separate WAN.
All the machines are virtual,  Thank you for the guidance.
0

Featured Post

Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

by Batuhan Cetin Within the dynamic life of an IT administrator, we hold many information in our minds like user names, passwords, IDs, phone numbers, incomes, service tags, bills and the order from our wives to buy milk when coming back to home.…
Recently, I had the need to build a standalone system to run a point-of-sale system. I’m running this on a low-voltage Atom processor, so I wanted a light-weight operating system, but still needed Windows. I chose to use Microsoft Windows Server 200…
Do you want to know how to make a graph with Microsoft Access? First, create a query with the data for the chart. Then make a blank form and add a chart control. This video also shows how to change what data is displayed on the graph as well as form…
Visualize your data even better in Access queries. Given a date and a value, this lesson shows how to compare that value with the previous value, calculate the difference, and display a circle if the value is the same, an up triangle if it increased…
Suggested Courses

801 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question