DHCP Reservations and ARD

I asked this question on someone elses thread. I'll ask here as well..
I have 2 computer on my Airport Extreme network I am controlling with my Macbook pro (ARD Admin)
G5 Tower - on ethernet, Macbook Air on wireless (which travels outside network sometimes)
When inside the network I can control both computers... no problem.
When outside I can control only the G5.
I have setup a DHCP Reservation for the G5 on the Airport Utility so I can access it from outside. Works great... I can add a second DHCP Reservation for the Macbook Air but the Port Mapping does not allow a second mapping to the Air.
How can I do this?
Second question - DHCP Reservation - If the Airport remaps the DHCP addresses each 24 hours, Can i use an IP over the range... say - 205? This way the target computer will always be available?

I have setup a DHCP Reservation for the G5 on the Airport Utility so I can access it from outside. Works great... I can add a second DHCP Reservation for the Macbook Air but the Port Mapping does not allow a second mapping to the Air.
As you have found out, the AirPort Utility will not allow you to map the same port to more than one device. The only way around this is to use a different port for the same function. In this case, letting ARD know to use a different port to listen on for the MacBook Air.
Second question - DHCP Reservation - If the Airport remaps the DHCP addresses each 24 hours, Can i use an IP over the range... say - 205? This way the target computer will always be available?
Yes. The purpose of using the DHCP Reservation feature is so that you can create a "permanent" IP address within the range of IP addresses in the DHCP pool. Prior to this, using an IP address just outside of the pool was a common tactic to make sure that the address used would not conflict with the DHCP server's pool.

Similar Messages

DHCP Reservation Sync and DNS Host record sync etc shown in IPAM GUI

Hello all,
I am aware of the scripts in the TechNet script center to sync DHCP leases etc to IPAM, however my question is about something else -
If you highlight an IP address (IP address inventory->select an IP), You can see fields that say: "DHCP reservation sync", "DNS PTR record sync" and "DNS host record sync" as below:
I was curious as to what these are for. Is there some built-in sync functionality for these that I perhaps have not enabled? (Don't see such options any where..)
thanks,
-Ravi

Hi Ravi ,
The three columns tell us the information of the synchronization between IPAM server and DNS server (or DHCP server) .
Here is the detailed guide for using IPAM :
Using the IPAM Client Console :
https://technet.microsoft.com/en-us/library/jj878351.aspx#inventory
IPAM can sync DNS and DHCP records .
The IPAM database is separate from DHCP and DNS servers on our network ,and full synchronization of hosts and IP addresses between IPAM and managed DNS or DHCP servers does not occur automatically
unless we have configured automated tasks to perform this synchronization .
For detailed information ,see
DNS and DHCP record synchronization chapter in the following link :
Multi-server Management :
https://technet.microsoft.com/en-us/library/jj878329.aspx
Best Regards,
Leo
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DHCP reservations sometimes work and sometimes not.

Hello.
I have created a few DHCP reservations in my enivoriment. Some of the reservations do take and some do not. I even recreated the reservations verified the MAC addresses rebooted the PC also a IPCONFIG/release and IPCONFIG/renew
still will not grab the IP address set in the reservation.
What more can I look at since some reservations work and some do not?

Hi,
Does the client get the IP address from the DHCP server which has reservations? You may check this by "ipconfig /all".
If yes, please check that if there is any warning or error in the event viewer of the DHCP server.
If no, it means that there is other unauthorized DHCP server in your network.
If it is possible, please post these warnings and errors here. It's useful for further troubleshooting.
Hope this helps.
Steven Lee
TechNet Community Support

Vlan Select and DHCP reservations on a WISM with code 7.0.116.0

We went to using vlan select this semester and have had a couple of issues where clients (printers) wont pull their reserved ip from dhcp. From what I've read vlan select can handle static ip addresses but can it handle dhcp reservations if the current vlan selected in the round robin function is not the vlan that the ip is reserved in?

George,
Are you talking about a dhcp mac reservation for a device on all vlans in the bundle? If so, you can... The issue I ran into is that clients had to connect to a wireless printer and a wireless projector and they connected to it via ip address. So it became a nightmare with users. They just kept complaining that it works some days and other days it doesn't. Some devices were powered off after it was used. It would be nice if you can import a list of Mac address and specify what interface it is allowed on... That would make it easy.
Sent from my iPhone

Express and extreme both "n" with static vs dhcp reservations.

Good day, and thanks for reading.
I have an express that I have configured to "extend my wireless network" with my extreme. This is all setup manually, with no internet connection needed. everything is static and I am just using the wireless and switch of the routers.
I have 4 electronic components that have static IP addresses _and_ I have added the mac addresses to the DHCP reservation list as well.
I would prefer to leave everything with just the manual addresses in mac access control, however- the apple log does not show the connections for these components with static addresses. However, they do show up on the log as connected in the DHCP client log when I am using DHCP only.
My questions are;
1. Does it hurt performance on the routers to have the mac addresses filled in on both the DHCP reservation list, and the mac address control list?
2. Do I need to have all the mac addresses for my connected components on both the extreme and the express or, can I just have them inserted on the extreme- and are there any conflicts that can arise with having them coded on both routers?
I just want to be able to see the connections on the log, and currently it will only show them if I am using DHCP.
Thanks you.

Hello chrisinoswego. Welcome to the Apple Discussions!
1. Does it hurt performance on the routers to have the mac addresses filled in on both the DHCP reservation list, and the mac address control list?
No.
2. Do I need to have all the mac addresses for my connected components on both the extreme and the express or, can I just have them inserted on the extreme- and are there any conflicts that can arise with having them coded on both routers?
When employing MAC Access Control, the MAC addresses would need to be entered in each base station. The only conflict that I am aware of is when the (in this case) two MAC lists are not identical.

DHCP reservation BAD_Address and Mac Address changes.

Ok. I understand about Bad_Address and the things that can cause it. That said, I am using Window 2003 and we are running DHCP. Yesterday we had a series of short power outages. Some were right after the other (1 or 2 seconds) others
were 10 to 40 seconds in between. The server (of course) has a UPS and so does most of our infrastructure (switches etc).
But it seems that one type of Printer that we have, were all switched to bad_address and they could not pick up their reserved IP address. Some of them seemed to remember their IP and are still functional, even though their reservation says bad_address.
I assume they will fail either at lease renewal or the next time they are power cycled. What surprised me was that these bad_address entries' reservations were changed to have an invalid MAC address.
All of them start with a 0 or a 1 and are only 8 characters long. 0401150a, 1701150a, 1901150a, hmmm. i see a pattern forming. They all have unique first 3 characters, but everything after that is 1150a. That led me to figuring
out what this number is. It's an inverted hexadecimal representation of the ip address that is being complained about. Why would the DHCP server replace the MAC with this convoluted string? Is this covered in any manual?
I am pretty sure it's not in the DHCP RFC.
Not sure why it was having the problem, unless somehow the printers were powering and made the DHCP request then discovered that the old lease information was kept somehow (remember, some of the outages were very brief) after the request had gone out.
But that, and nothing else I can think of makes sense. And it only happens on one model of our printer. At least so far. And this isn't the first time we've seen it happen this way.
Any ideas appreciated.
Chris

Hi Chris,
Firstly, it seems that the Unique ID of the DHCP Reservations are inverted to the IP addresses in hex. And, the most possible cause is IP conflict.
For example:
0401150a -> 04 01 15 0a (hex) -> 4 1 15 10 (decimal) -> 10.15.1.4 (IP address)
Meanwhile, I agree with the possible cause as you said, however, would you please kindly let us know the following:
1. How many DHCP Servers do you have? Or, is the DHCP Server multihomed?
2. Do the printers have multiple NICs?
3. Are the printers both statically configured and have DHCP Reservations in the DHCP Server?
4. DO other DHCP clients in the same scope have the same issue?
5. Is there any trace in DHCP log?
In addition, if Conflict detection is enabled in your DHCP Server, please disable it and see how it works.
Also, please check if you can get some clues from this TechNet Thread:
DHCP server bad address issue
In addition, as the issue only occur with the same model of printers, it is worth to contact the vendor for their insight on it.
Hope this helps.
Jeremy Wu
TechNet Community Support

DHCP reservation & DNS for content filtering

Hi All,
I am working around with server 2008 for quite a while and facing a problem as below,
1.DHCP reservation error
Server Ip:192.168.0.254 (configured as DNS server for local use only with AD & DHCP)
DHCP scope: 192.168.0.100 to 192.168.0.200 excluded 192.168.0.100 to 192.168.0.110
earlier the same scope was 192.168.0.10 to 192.168.0.100. I was facing a error when I make a IP reservation against a MAC number error was " The unique identifier may not be correct do you want to use the identifier anyway" when I click yes "DHCP
server received a message from a client that is not valid" and by this error I am not able to make any reservations now against MAC numbers.
The same error was also on the earlier scope and that's why changed to a new scope but did not work. Any solutions will me much appreciated
2.DNS fine tuning.
I have an open DNS account on which my WAN IP number is configured to do a content filtering. I have two LAN ports with the below IP number
Local : 192.168.0.254 ( configured with no gateway and DNS as loopback (127.0.0.1)
ISP: 192.168.0.253 (with ISP gateway and DNS as loop back adapter & open DNS)
I have did a content filtering and things are working fine. But I got to open up some machines out of this content filtering and when I try to give the IP number in this below fashion.
192.168.0.115
255.255.255.0
192.168.0.1
DNS
192.168.0.254
ISP DNS to avoid filtering
I find that 192.168.0.254 does the resolving and things are still filtered as per the schedule. Is there a way where we can configure 192.168.0.254 (Local DNS server) to stop resolving web requests and only cater to resolving local names for connectivity.
I do know its too long but solutions for the same will be help me out to solve it. Thanks in advance.
Regards,
Vaschell

Hello,
I have found something strange on the DHCP reservation. When I try to add a MAC number out of the network its able to make out a reservation.
Is there any way to clear the MAC number cache or something else which I can try.
A copy of the ipconfig /all for the server is below,
C:\Users\Administrator>ipconfig /all
Windows IP Configuration
   Host Name . . . . . . . . . . . . : server
   Primary Dns Suffix . . . . . . . : xyzabc.com
   Node Type . . . . . . . . . . . . : Hybrid
   IP Routing Enabled. . . . . . . . : Yes
   WINS Proxy Enabled. . . . . . . . : No
   DNS Suffix Search List. . . . . . : xyzabc.com
Ethernet adapter LOCAL:
   Connection-specific DNS Suffix . :
   Description . . . . . . . . . . . : Intel(R) I210 Gigabit Network Connectio
#2
   Physical Address. . . . . . . . . : 00-1E-67-A4-F4-DC
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
   IPv4 Address. . . . . . . . . . . : 192.168.0.254(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . :
   DNS Servers . . . . . . . . . . . : 127.0.0.1
   NetBIOS over Tcpip. . . . . . . . : Enabled
Ethernet adapter ISP:
   Connection-specific DNS Suffix . :
   Description . . . . . . . . . . . : Intel(R) I210 Gigabit Network Connectio
   Physical Address. . . . . . . . . : 00-1E-67-A4-F4-DB
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
   IPv4 Address. . . . . . . . . . . : 192.168.0.253(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 192.168.0.1
   DNS Servers . . . . . . . . . . . : 127.0.0.1
                                       208.67.222.222
                                       208.67.220.220
   NetBIOS over Tcpip. . . . . . . . : Enabled
PPP adapter RAS (Dial In) Interface:
   Connection-specific DNS Suffix . :
   Description . . . . . . . . . . . : RAS (Dial In) Interface
   Physical Address. . . . . . . . . :
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
   IPv4 Address. . . . . . . . . . . : 192.168.0.205(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.255
   Default Gateway . . . . . . . . . :
   NetBIOS over Tcpip. . . . . . . . : Disabled
Tunnel adapter Local Area Connection* 8:
   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix . :
   Description . . . . . . . . . . . : isatap.{0602F6CF-4B32-491F-994A-3C0952D
B54}
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
Tunnel adapter Local Area Connection* 9:
   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix . :
   Description . . . . . . . . . . . : isatap.{6A14710B-A078-4AF9-BD7A-989767F
377}
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
Tunnel adapter Local Area Connection* 11:
   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix . :
   Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
   Physical Address. . . . . . . . . : 02-00-54-55-4E-01
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
Tunnel adapter Local Area Connection* 12:
   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix . :
   Description . . . . . . . . . . . : Microsoft ISATAP Adapter #3
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
C:\Users\Administrator>
Thanks,
Vaschell

E4200 : DHCP Reservation not showing anything !?!

Hello,
When I'm in Setup -> Basic Setup -> click on DHCP Reservation, I don't see all entries I've created earlier but computers that connect still have the correct IP address on the network; I don't know if I can create additional entries if nothing appears, what should I do ?
When I go to Status -> Local Network -> DHCP Client Table the list is blank but some computers are connected to the network
I'm using firmware 1.0.01 build 10 Feb 21, 2011, language = English, Firefox 4.0.1
Rebooting the router doesn't change anything, I can't see connected LAN equipment and DHCP Reservation is empty despite the fact I've created entries.
Together with the "Access Restriction" which doesn't allow to block a computer from 10pm => 8am unless you create 2 rules + various issues with attached USB + 2.4Ghz signal that is far from optimal (never able to achieve more than 144-N-Mbps) and I ask myself if I will not contact the store where I purchased this unit and ask a refund (and buy something else from another brand...)
It's the first time I buy a Linksys equipment and very disappointed, support doesn't seem to be very serious
Thanks for any suggestion
PS: Where do I ask for a refund or something similar in Linksys site ? If nothing exists, I'll let the store where I purchased this unit now about the present post

Thanks for your answers
Today it works and I didn't reboot, restart or reset anything
I can see DHCP Reservation list + DHCP Clients Table
Same PC, same network, nothing restarted, reset, changed or added and now it works
Weird
I would not like to re-create everything in the DHCP Reservation List as I have 17 entries so far (and going to add 1 more...)
Apparently, if I can't see my list, I have to wait a few days

DHCP Reservation

DHCP reservations are nothing more than instructions to the server.The DHCP client protocol doesn't know anything about reservations. DHCP clients send their MAC address as part of the request and the DHCP server uses this address to find a matching reservation. If the server finds a match in the reservations it allocates the reservation address. If not then the server searches the existing lease table and allocates the first match there. If no MAC match is found then the next available IP address is allocated. The protocol doesn't proscribe how the "random" allocation is done, just that it come from the lease pool.Because the DHCP client doesn't know about this it then starts sending lease renewal requests at the 50% point in the lease.To unblock port 68, enable Bootp on your DHCP server. The Windows DHCP server works with both DHCP...

Hi,
I have a thin client device that receives an IP address from a DHCP server on Windows 2008. I created a DHCP reservation for the device to use 192.168.0.81 and confirmed that the IP address was assigned to the device correctly.
But I have been seeing packets are being blocked by firewall because port 67 from requesting device to DHCP server on port 68 does not allow by default rule on firewall.
My question is, even though the device receives the reserved IP address, why it keeps sending DHCP packets to its server? As far as I know, when DHCP reservation is used, there is no lease time allocated to the IP. Or does device send DHCP packets anyways regardless of reservation? If it does, how often does requesting device send the request?
This topic first appeared in the Spiceworks Community

What is the maximum dhcp reservations

What is the maximum dhcp reservations in apple airport extreme? Can it hold 20 records? More?
I am considering switching from my current router from another vendor because it can hold maximum 10 dhcp reservations.

Any follow up on this? My airport extreme seems to have a ceiling of 25 and I need ~35.

Missing Add DHCP Reservations Option

I have an older Airport Extreme Base Station (flying saucer variety...version 5.7...purchased approx. 2005(?) 802.11b/g). I am using an iMac with AirPort Utility 5.5.3. I am attempting to set up my AEBS to allow Remote Management from my MacBook Pro from outside my Airport network.
My understanding is that I need to be able to add DHCP Reservations in AirPort Utility to begin to make the proper connections.
When I visit the Internet/DHCP tab in AirPort Utlity I am shown:
DHCP Beginning Address (10.0...)
DHCP Ending Address (10.0.1...)
DHCP Lease (4) (Hours)
DHCP Message: (-blank-)
LDAP Server: (-blank-)
That's it. I'm not presented any list of DHCP Reservations, nor the "+" button to allow me to add a new Reservation. Aren't I supposed to be able to add Reservations on this view?
Is, perhaps, my AE Base Station too old to allow adding Reservations? Or, could some other setting be wrong preventing this option?
My Internet Connection/Connection Sharing is set to "Share a public IP address".
Any direction or links to other discussions on this topic are most appreciated. Thank you.

It's been too long ago for me to remember what the Flying Saucer settings had....
Here is a screen shot of Airport Utility 5.6 which is for Lion and it shows the DHCP reservations.
Airport Utility 5.5.3 should have the same as 5.6 has only been out for a couple of weeks...

New Time Capsule: Assign DHCP address and backup to USB disk?

Hi all,
I am setting up a new Time Capsule and have two questions:
- I am successfully backing up my MacBook Pro to the internal TC disk. I like loooong backup histories, so I would like to backup my iMac to a separate Time Machine disk attached to the TC via USB. I have googled and not found anyone saying it can be done. I have attached a USB disk and tried to configure TimeMachine to see it, but it is invisible. Is this even possible?
- I want to assign a specific IP address to a Linux server (Ubuntu Jaunty) on the internal network of the Time Capsule. I can get a "random" DHCP address assigned, but I cannot get a specific one assigned. I have tried to create DHCP Reservations for the Linux box using both its MAC address as well as the DHCP client ID (preferred). No matter what, I still get the random DHCP address. On the linux box, I have made sure to set the Client ID as well as removing the old leases file. Any hints?
Thanks in advance for any help on either front!

...so I would like to backup my iMac to a separate Time Machine disk attached to the TC via USB.
That is not possible with Time Machine.
Time Machine will backup any files residing on your Mac or residing on any disk connected via USB or FireWire directly to your Mac.
Time Machine will NOT backup files residing on a network drive like the USB drive connected to a Time Capsule.
I want to assign a specific IP address to a Linux server (Ubuntu Jaunty) on the internal network of the Time Capsule.
The default settings of the Time Capsule use the addresses 10.0.1.2 to 10.0.1.200 for DHCP clients. If you want this server to have a fixed IP address, simply configure the server to have a manual IP address in the range 10.0.1.201 to 10.0.1.254.

Cannot make DHCP reservation out of the DHCP pool

Hello,
I foud a bug in the router:
I am using network 172.16.20.0 with subnet 255.255.252.0 wich means i can use IP adresses from 172.16.20.1 until 172.16.23.254.
When i setup my DHCP server on the router (from 172.16.20.1 to 172.16.20.100) i cannot make a DHCP reservation outside of this DHCP pool.
Is there a workaround or am i doing something wrong?
Thanks in advance.

This is normal networking standards. When a DHCP pool is set up, only reservations work with in this pool. You can set up static IPs out side this pool if needed. Which is recommended for printer, NAS and low priority devices.

DHCP Reservation problems caused by ARP proxy?

We have been having recurring problems at three of our new school sites with printer IP addresses. We have created the address reservations in our DHCP servers (Windows Server 2012) but several times per week, the address shows up as a "BAD ADDRESS" in the DHCP leases and the printer never does get a good lease until we recreate the reservation and power cycle the printer. This is happening across several different printer models.
Because this is only happening at our new sites, I've been investigating possible reasons. The configurations are mostly identical at our new sites and old; we have 3750X's at the old sites and 3850's (and one school with 4500X's) at the new sites. We have the correct IP helpers on every VLAN - one for each of our DHCP servers and one for each ISE node. ISE doesn't respond to the DHCP requests, it only listens for them to profile the endpoints. I've also begun enforcing ISE at one of the sites to see if it was just related to IP conflicts - no luck so far.
Today I was fixing a printer reservation and came across something interesting. At one of the new schools, the MDF ARP table reported that 10.24.12.20 was assigned to a workstation (it is supposed to be assigned to a printer). When I ran a check on the port in the IDF associated with that IP address to find the IP that was associated with the device, the device had an IP of 10.24.12.26. This caused me to start looking for ARP problems.
I went looking for a difference in the configs on the 3850's and the 4500X's compared to the 3750X's at the older sites. Here's what I found when I did a "sh run all":
4500X:
ip arp poll queue 1000
ip arp poll rate 1000
no ip arp proxy disable
ip arp gleaning tftp
ip arp gleaning udp
ip arp incomplete retry 20
ip arp incomplete entries 5000
ip arp incomplete enable
ip arp inspection log-buffer entries 32
ip arp inspection log-buffer logs 5 interval 1
ip sticky-arp
no ip gratuitous-arps
The 3750X only has the following ARP commands:
ip sticky-arpno ip gratuitous-arps
ip arp inspection log-buffer entries 32ip arp inspection log-buffer logs 5 interval 1
I was looking in particular at the "no ip arp proxy disable" on the 4500 and 3850's. I'm wondering if the newer switches are working as ARP proxies and causing problems with the printers. It doesn't seem that the 3750X's or older are doing this, or even have the commands. I am headed down the wrong path here? What are the repercussions of disabling the arp proxy on the newer switches to test it?
Thanks

Hi,
if you have proxy arp then you should see multiple IP mapped to same MAC( the one from the device with proxy arp enabled), is this the case ?
Regards
Alain
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WRT610N DHCP Reservation Client Table empty, please help!

Even though there are about 15 devices connected to the router right now there is literally nothing showing up in the DHCP Reservation list, and when I add something manually it will not come up either. I have tried reinstalling the firmware and even setting the options to default. Has anyone had this problem before? I have checked the forms and saw nothing on this subject.
This has been an issue since I bought the device, however the DHCP list did show up a couple of times when reinstalling the firmware but would go away after ~20 minutes of ussage. Any help would be greatly appreciated!
Message Edited by chrizburnz on 10-06-2009 03:53 PM

Surprise surprise. After being explict with Tech Support, having them repeatedly confirm that someone will be calling me today, I got nothing. There was not a peep whatsoever from them. I guess I kind of suspected that since they had done all that they could think of to resolve the problem yesterday. I'm just another disgruntled customer to them.
Hence, I took matters into my own hands to get my DHCP Reservation list back and to prevent it from disappearing in the future. I also took some very good advise from chrizburnz. The steps provided below are exhaustive and probably 50% unnecessary. The problem is knowing which steps are crucial and which are redundant and/or needless. I wasn't going to waste any more time trying to figure this out. I spent hours with Tech Support (3 different techies altogether) and they couldn't get my list back, even after reinstalling the firmware. I don't plan to be updating this list a lot anyway.
To get your DHCP Reservation list back and keep it from disappearing in the future, do the following...
Power down all LAN and wireless devices that connect or want to connect to your router with the exception of a single wired computer.
Save your current router configuration. There is a Backup Configurations button on the Administration tab.
Hit and hold the reset button on the back of your router for 30 seconds as previously advised.
After releasing the button, pull the power cable out of the router and wait another 30 seconds or so.
Plug the power cable back in and wait for your router to boot.
Load the original CD that came with the router and redo the Setup procedure.
Once the router pulls down an IP address from your modem, you can then start to configure your DHCP Reservations list from scratch.
Click DHCP Reservation off of the Setup --> Basic Setup tab.
Starting with the PC already connected, enter in your current PC information using the Manual method. Don't use the Add Clients button. (The MAC address should be appearing in the list above this button. You can just cut/paste it in.)
For the name, do not use special characters, spaces, or numbers. Just use upper/lower case letters and keep the name short.
Click Save Settings. Click Continue. Click the Close button at the bottom of the window.
Click Backup Configurations on the Administration tab. (You can always restore if your list vanishes on you. You don't want to have to start over from scratch the next time. You can just do the restore.)
Power up the next device. They appear to pop up immediately in the clients table. At this point, the DHCP Client table should be functioning as expected/advertised.
Repeat steps 9 through 14 until all your devices are full reserved.
Again, this is the exhaustive procedure. I can't say which steps are crucial. Just add one entry at a time, short names, letters only, and save the configuration each time you successfully add an entry. (Never "x" out the DHCP Reservation window. Use the Close button.)
If anyone finds out the real deal here, can you please post it. Or, better yet, Cisco can fix their firmware bug in the next release.

DHCP Reservations and ARD

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