static IP with no connection

Dear all,

I am an IT support for a small company consist of 5 users. I assigned a static IP address on each computer.
Around 3 weeks one of my colleague was not able to browse the connection or see the shared folder on the server until I changed his PC's IP address. This issue reoccurred again today on his PC and on another PC.
I have done a lot of troubleshooting and the last step was changing the IP address. After changing the IP address on two PCs they were able to browse the internet connection and see the shared drives.

I am wondering what is the magician with changing the IP address. Please assist me because I am looking for a solution to avoid keep changing the IP addresses form time to time.
sam kamITAsked:
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ThierrySysAdminCommented:
On the network, is there a DHCP server? if so, are the fixed IP addresses outside the DHCP Range.
One of the reasons this issue might happen is because another device is using the same IP address.
This could be a printer, Mobile phone, laptop, whatever....
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Brian BEE Topic Advisor, Independant Technology ProfessionalCommented:
Even though there are only five systems, it would probably be easier to set up a small DHCP range. I'll bet their internet router has the ability to do that.
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JohnBusiness Consultant (Owner)Commented:
As per above and also, the router could have restarted, changing IP addressing.

Why use user Static IP addressing?  It does not work well, serves no purpose and should not be used (my experience across lots of client machines).  Change to DHCP and your support life will be much easier.
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sam kamITAuthor Commented:
Thank you guys.
I am turning on the DHCP server and using fixed IP to be on the safe side.
I solved the problem by disabling the DHCP on the TP link router.
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JohnBusiness Consultant (Owner)Commented:
Your server should always be the DHCP server, not the router. With server as DHCP it is even more important that the workstations connect normally.
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ThierrySysAdminCommented:
If you like/need, you could reserve IP addresses in the DHCP server for the 5 pc's, based on MAC address
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Brian BEE Topic Advisor, Independant Technology ProfessionalCommented:
John has a point. I was assuming you aren't on a domain. If you are, it's better to run DHCP on the DC or whatever server you have since it's more flexible than what a router offers.
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sam kamITAuthor Commented:
Is it recommended to use the DHCP and fixed IP at the same time?
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Brian BEE Topic Advisor, Independant Technology ProfessionalCommented:
No reason why not. Just make sure when you set up your DHCP range that you leave space for fixed IP devices.
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JohnBusiness Consultant (Owner)Commented:
You can have fixed IP addresses outside of the DHCP scope and have reserved IP addresses inside the DHCP scope but workstations should still be DHCP as a general rule.  Printers are best with reserved DHCP addresses and routers/servers are best static.
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sam kamITAuthor Commented:
Thank you guys.
You are really helpful.
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pgm554Commented:
What a DHCP server normally does is before it assigns an address ,it pings the address it is going to assign so that you don't get a duplicate .
It's kind of a fail safe mechanism so that you don't have these types of issues.
And most Windows systems will warn you it has detected a duplicate IP.
Having more than one DHCP server on a network can cause duplicate IP's to be issued.
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sam kamITAuthor Commented:
Yes I have enable the DHCP on the server and on the TP link router
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JohnBusiness Consultant (Owner)Commented:
Disable DHCP on the router and leave DHCP only on the Server.
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sam kamITAuthor Commented:
Thanks a million Mr.John
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Brian BEE Topic Advisor, Independant Technology ProfessionalCommented:
Glad to hear you are getting help. To recognize the efforts of the Experts and also for the benfit of others with similar problems, if you have confirmed a solution, please remember to mark the answer(s) that helped you.
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sam kamITAuthor Commented:
The problem is resolved after following your instruction.
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JohnBusiness Consultant (Owner)Commented:
Thank you and I was happy to help you.
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Brian BEE Topic Advisor, Independant Technology ProfessionalCommented:
Sam, I don't think John's answer was the only answer that helped and you probably should have selected more answers as part of the solution. Were you aware you can select more than one answer? Please explain, or would you like the question reopened to try again?
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