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Reservation or Exclusion setup on DHCP
- Thread starter jdavis37
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You could set up a permant reservation, but you will need the MAC address of the printer network interface. (subject to typos and could require testing and troubleshooting.)
If you want your printer's IP to be within the DHCP scope of IPs for some reason, an exclusion is an easy way to go.
But if you have a very large network that is changing constantly, and you have a lot of printers, the reservation may be the way to go.
If your environment is small, and you don't have a lot of printers, just set an exclusion, set the IP, GTY and SNM on your printer and forget it until your network needs to change.
so both will do the job depending on your environment.
Dana
If you want your printer's IP to be within the DHCP scope of IPs for some reason, an exclusion is an easy way to go.
But if you have a very large network that is changing constantly, and you have a lot of printers, the reservation may be the way to go.
If your environment is small, and you don't have a lot of printers, just set an exclusion, set the IP, GTY and SNM on your printer and forget it until your network needs to change.
so both will do the job depending on your environment.
Dana
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Just my preference, but, devices like printers and servers should never be included in a DHCP scope.
DHCP works great with clients (users); but, printers and servers are usually always dependent upon a static IP. Print queues are usually set to an IP for the print server. Web servers/sites are registered with to an IP. Applications can be set to look for an IP. Resources become attached to the IP address and when that changes you can be seeing all types of problems. I have seen too many networks develop problems with the DHCP server that impacted the entire network before the Admin looked at the DHCP as the culprit.
DHCP, in my opinion, is used by too many admins in the wrong way and it bites them for it later.
Good luck.
Bob
DHCP works great with clients (users); but, printers and servers are usually always dependent upon a static IP. Print queues are usually set to an IP for the print server. Web servers/sites are registered with to an IP. Applications can be set to look for an IP. Resources become attached to the IP address and when that changes you can be seeing all types of problems. I have seen too many networks develop problems with the DHCP server that impacted the entire network before the Admin looked at the DHCP as the culprit.
DHCP, in my opinion, is used by too many admins in the wrong way and it bites them for it later.
Good luck.
Bob
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tcambridge
IS-IT--Management
Another argument for using reservations vice exclusions for your printers is address management. I'm sure you have a spreadsheet or database with all the printers and their IP addresses, right? Why not let DHCP keep all of that info for you instead of having it in two or three different places?
Something to think about...
Tim Cambridge
A+, CCNA, MCSA, MCSE (W2K)
Something to think about...
Tim Cambridge
A+, CCNA, MCSA, MCSE (W2K)
- Thread starter
- #14
Hi, tcambridge
What's the two or three different places are you reffering to? I'm try to use the DHCP server only. Since, I have printers, servers and workstations in place already. I was looking for away to separate my printers/servers ip's from the list. I tried using exclusions but some of my printers were losing connections. Right, now the project is on hold until I can figure out why?
What's the two or three different places are you reffering to? I'm try to use the DHCP server only. Since, I have printers, servers and workstations in place already. I was looking for away to separate my printers/servers ip's from the list. I tried using exclusions but some of my printers were losing connections. Right, now the project is on hold until I can figure out why?
tcambridge
IS-IT--Management
JDavis,
In other words, instead of having a spreadsheet or database to track your IP allocation, everything is already in DHCP, provided you use reservations.
If you want to only use the DHCP server to manage your IPs, I suggest making reservations for your printers. Also, it's always good practice to backup your database regularly, and, if possible, have a standby DHCP server ready to take over should something happen to the primary. You can have the same scopes on the standby but don't activate them.
IMHO, I don't think that having the printers' IPs excluded from the DHCP scope is the cause of the printers losing their connections. The exclusion list just a range of addresses that the DHCP server does not lease out nor does it keep track of.
Can you give some more information about the printers that are losing their connections, i.e., how often does it happen, what do you do to correct it, model of printer, switch/hub/router info, print server info, etc?
Good Luck!
Tim Cambridge
A+, CCNA, MCSA, MCSE (W2K)
In other words, instead of having a spreadsheet or database to track your IP allocation, everything is already in DHCP, provided you use reservations.
If you want to only use the DHCP server to manage your IPs, I suggest making reservations for your printers. Also, it's always good practice to backup your database regularly, and, if possible, have a standby DHCP server ready to take over should something happen to the primary. You can have the same scopes on the standby but don't activate them.
IMHO, I don't think that having the printers' IPs excluded from the DHCP scope is the cause of the printers losing their connections. The exclusion list just a range of addresses that the DHCP server does not lease out nor does it keep track of.
Can you give some more information about the printers that are losing their connections, i.e., how often does it happen, what do you do to correct it, model of printer, switch/hub/router info, print server info, etc?
Good Luck!
Tim Cambridge
A+, CCNA, MCSA, MCSE (W2K)
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