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Mixing Static and Dynamic IP addressing

By HAFox ·
I serve as a one-man IT shop for our medium-sized family business and I don't have the time to learn, much less understand, all of the intricacies of networking, although I've managed to keep everyone connected, working and secured for about ten years now. One of our little 5-person office networks utilizes cable broadband and a mix of wired and wireless connections using DHCP on the router and clients.

Now we've purchased a networked BizHub for which the installation techs say they will need a static IP.

How does one use dynamic and static addressing at the same time?? If I provide one static IP address for the BizHub will I have to assign all of our clients static IPs? And how will that affect our mobile clients that travel to other company locations where DHCP is also the rule?

Would anyone out there have a walk through for a Linksys WRT54GS router that would help with the necessary config changes?

Lastly, how does one determine the appropriate static IP(s) to use in these cases?


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by sgt_shultz In reply to Mixing Static and Dynamic ...

it's not a problem to have some static address while the other stuff uses dhcp. you can mix them at will. if stuff doesn't work it is because you have a misconfiguration on the static box, not because you can't do it. why not try setting yourself up on static for a test. the proof of the pudding is lan and internet access. i don't know what bizhub is or what you are using it for. maybe a firewall product? or a intranet product? so i have to assume a couple things here:

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by sgt_shultz In reply to

1. you are putting inside your network so you need the static address in discussion here is a lan (local) address and
2. you are currently using the linksys router as your dhcp client.
so based on those assumptions, here is my two cents.
to setup static you need to know:
1. available ip address on your subnet
2. subnet mask
3 gateway and lan dns server address if you got one
go to a desktop that works (yours?) examine the network settings confirm is dhcp. then go to cmd prompt, type ipconfig <enter> Windows Help if you don't know how to do this stuff, the links will take you right there.
see something like your nic is at or something. with a subnet mask of probably and a gateway address of what i bet is your router. do a net view now and ping all the nanes to get the other ip addresses without walking all around...write them all down then supply those numbers to the tech installing the thing or if it is you, pick a number out of the range the linksys is dishing out. it is usually 40 numbers so pick say put all your static stuff at 70 or above, see? linksys not going to give out a number that high so no conflict. it is your job to prevent conflict with other static ip addresses that might be needed later so document stuff and/or put a sticky on the bizhub with the numbers you use. if you can't get internet access probably means you don't have dns. unless you have a dns server it is going to be the router for now which is gonna point out to the isp dns servers (instead of properly looking at the lan dns tables then forwarding requests not satisfied there to the internet dns servers) depending on what this device is you may or may not have to address this right now. you should fix eventually. look up your step by step on linksys website-wealth of info you seek

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by CG IT In reply to Mixing Static and Dynamic ...

DHCP has the ability to reserve a pool of addresses so they are not assigned to DHCP enabled clients. you create the reserved pool and use one of the reserved addresses.

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by CG IT In reply to

here is a microsoft article which can give you some info on configuring DHCP. Note: DHCP is the same for a router with DHCP or a server with DHCP. If you look on your routers help pages, they should provide their step by step.;en-us;323416

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by vic In reply to Mixing Static and Dynamic ...

First determine which router/device or server is actually performing dhcp for you. Once you locate which one, configure either an exclusion range, or a reservation. For example, if you want to give the bizhub you'd just exclude that address from your dhcp range. A good practice would be to actually exclude a block/range to account for future static needs. By that I mean create an exclusion for the range to Then you know that you can statically assign anything within that range and not have to worry about conflicts with other dynamically assigned addresses.

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