Assigning a dhcp reservation

Hi,
I recently noticed how my westell 6100g modem provided by verizon is also a router.
This causes some problems since I have the thing connected to an apple airport extreme router which I connect all my devices to.
I thought I had the problem solved by making the airport a bridge and for the most part I did. Except for one thing.I have an old printer which cannot seem to get an ip through dhcp unless I assign one using a dhcp reservation.
Here is my question: Can I either
1. Turn the router portion of the westell modem off so it just provides a direct connection. THAT way I can use the apple router functionality instead? (I'd rather do this)
2. Assign a dhcp reservation in the westell modem so my printer works.

bachmann1234 wrote:
1. Turn the router portion of the westell modem off so it just provides a direct connection. THAT way I can use the apple router functionality instead? (I'd rather do this)
I point to
http://www.dslreports.com/faq/13600
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Similar Messages

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

DHCP Reservations on E1200

Hi. I'm setting up a new E1200 and I'm searching for the area for DHCP reservations. My D-Link DIR-615 offers this ability in the Admin panel. This is quite useful since it allows for easier port forwarding management to specific Machine IPs without having to assign static IPs for each machine. I can't seem to find any documentation on this feature no the site or in the forum that applies to the E1200. If it's not offered, boy did I make a mistake in getting the E1200. I should have bought another DIR-615. If I have overlooked this, please advise as to where it is in the Admin panels. Thanks!

And in such a handy place! I was looking under advanced settings and couldn't see it. Searched the forum. and The Google, didn't bring up any info...
Thanks for the hand holding!
Happy to be a Cisco customer.

EA6700 DHCP Reservation (Static DHCP) limit

Hi,
just got an EA6700. Setup was the most difficult I've ever experienced in many years of Wifi/router config. I almost packed it back up to return it. The cloud thing is absurd. Using CAPTCHA that does not even display the CAPTCHA image is even worse.
Alright, I succeeded in using the local admin login and set up the router. Actually the plan was to have it just be a wireless access point, using my Cisco RV042 as the router and DHCP server. Well that 'dream' was squashed right quick. That **bleep** RV042 blew up when I added one more Static DHCP entry. Poof. 'No more SYSTEM' errors in a few spots. On reboot the darn thing does not come back up. This after the RV042 needed to be reset after I used a quote or some other 'illegal' character in a static DHCP entry. What a piece of amateur junk.
So. Tomorrow I will reset the RV042 again and relegate it to just doing WAN failover, nothing more. The EA6700 will be the router and DHCP server. So my question (sorry for the ranting) is how many DHCP reservations the EA6700 can handle. I'll probably need 75. I assign DHCP reservations for LAN stability and to prevent IP address collisions.
Please note that I'm not talking about static IP addresses. I have a few of those too but I know they are different from DHCP reservations.
Thanks,
Sander

It's highly unlikely the EA6700 can handle 70+ DHCP reservations. But I don't know for sure.
My advice is to go back to plan A and use EA6700 as AP.
Configure it for bridge mode. Be sure to "specify and IP address". Don't use "obtain IP address automatically" when configuring bridge mode.
http://kb.linksys.com/Linksys/ukp.aspx?pid=94&vw=1&articleid=25714
Edit: don't configure ea6700 for bridge mode while it's connected to your main router. You've probably noticed by now that the EA routers will automatically change their IP to 10.x.x.x if they detect a double NAT. Which I why I suggest keeping it disconnected from main router when configuring.

EA6200 DNS / DHCP reservation

Hello. I recently replaced my old router with a Linksys EA6200, and I'm having a bit of trouble getting local DNS working correctly.
On my network I like to set up DHCP reservations to make it easier to find certain machines. For example, let's say I have a DHCP reservation for 192.168.1.101 for a machine called "bob". DHCP seems to assign the proper IP to the machine, so that part seems to be working fine. But the DNS server in the router does not resolve "bob". This has worked fine on every other router I've owned. Any ideas what I'm missing?
Solved!
Go to Solution.

Ok, I think I've figured out what was going on, but I'll leave this here in case someone else has the same issue. It seems that my clients were still on the dhcp lease from my old router, so they had not registered. Forcing them to renew their dhcp lease seems to correct the issue.

Which cisco command on router can show me specific hosts which have dhcp reserved IPs

how can i get that which hosts of the network have reserved dhcp IPs as i know that dhcp reservation to be created when mac address will be assigned.
so, which cisco command on router can show me specific hosts which have dhcp reserved IPs.thanks

As said by Leo, the DHCP bindings will show the corresponding MAC addresses.
Unless you have a list of all MAC addresses somewhere (which most people tend not to) then you can use the ARP cache combined with the CAM tables to trace which ports relate to which MAC address to get more information on the host if you need it.

WRT150N -- DHCP Reservation stopped working

I had a printer assigned to an IP address and that showed up fine under Clients Already Reserved. I wanted to add my computer so I could forward a port to it. The DHCP Reservation list was empty. (I had assigned the printer manually). I tried Manually adding Client. It showed up under the Client Already Reserved list, but then both entries disappeared and absolutely nothing seems to be working. I know the computer didn't get assigned because when I switch from wireless to wired I get assigned a different IP. How do I get this stuff working again and why have I never got a list of the clients in the DHCP Tables?
I am on a MacBook Pro running 10.4.6

That wasn't quite the issue. The problem is I can't see anything in the DHCP Reservation window. However, I think everything is properly saved even tho I can't see it.
As a test, I shut down the router and my two computers. Then I started the router and turned on the other computer. It was assigned 192.168.1.102. I turned on my computer and it was assigned 192.168.1.101. I checked the printer and it was at 192.168.1.105. I did not shut off the printer but I am hoping shutting off the router would have cleared the DHCP table. At any rate, my computer is at 101 and the printer is at 105, which is exactly what I want.
I would like to be able to have the DHCP Reservation window properly populated without having to reset the router and lose all my settings. Is there any way to do that? It is pretty clear that it has never worked exactly right, but I was able to assign one device (the printer) and may have been able to assign a second device (my computer).
BTW, my router is running hardware version 1 and firmware version 1.01.9, which is the latest.

Vpn-addr-assign via DHCP

Hi,
We are facing some intermittent issue while connecting RA vpn users. This issue has started after upgrading ASA 5545-X 9.1.2 to 9.1.5-(10).
VPN users are successfully authenticated as per ACS logs, but its not able to complete the Phase 2 negotiation. VPN user ip address is configured to assigned from DHCP. However this is kind of intermittent as same users are able to connect some time, but not all the times.
Here is the configuration of one of the profiles and we have 3 similar vpn profiles.
group-policy XXX-VPN-Policy internal
group-policy XXX-VPN-Policy attributes
dns-server value x.x.x.x y.y.y.y
dhcp-network-scope 172.20.25.0
vpn-simultaneous-logins 3
vpn-filter value VPN-FLTR-ACL
vpn-tunnel-protocol ikev1 ikev2
split-tunnel-policy tunnelspecified
split-tunnel-network-list value xxx-VPN-ACL
default-domain value xxxx
tunnel-group xxxx-VPN type remote-access
tunnel-group xxxx-VPN general-attributes
address-pool xxxx-VPNPool-02
authentication-server-group RADIUS
default-group-policy XXX-VPN-Policy
dhcp-server 10.10.xx.xx
tunnel-group xxxx-VPN ipsec-attributes
ikev1 pre-shared-key *****
Can anyone advise what could be the issue, could this be a known bug.?
thanks in advance.

Hi Karthik,
Thanks for your reply, we can't use "no vpn-addr-assign local" command as some of the VPN groups are using ip address from local assigned pool.
Its a mix of both combination (local+DHCP)
Thanks for your time..

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

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
Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Support, contact [email protected]

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

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...

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.

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.

Assigning a dhcp reservation

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