Router DHCP Handing Out IP Addresses Not On The Same Subnet?
Dec 22, 2011
I have a Belkin model F9K1102 router supplying WAN/LAN connection to three PCs and 2 laptops. Two of the PCs are hardwired with the remainder PC and laptops are wireless. I'm using the default router IP of 192.168.2.1 and my ISP is Charter Cable (if that's of significance). The router is picking up all the dynamic IP information from my ISP and internal DHCP is enabled. Here's the issue though - when I connect a PC, laptop or iTouch (wired or wireless) with obtain IP settings automatically enabled the IP address it receives an IP address on a different subnet ie, 192.168.3.x and thus won't have WAN/LAN connection. I have tried to set the router IP to 192.168.3.1 and set the scope in the .3 subnet but the IP obtained by the device is .4! This makes no sense to me at all. The router is on the latest firmware (according to Belkin) and there doesn't seem to be any other update I can find. I have also tried another Belkin router (older model: F5D8236) and it does the same thing.
I'm not sure if this is related but I upgraded my service with Charter to a 18MB connection and a D3.0 Ubee cable modem - this issue seem to have began after this upgrade but I don't see how that would have any bearing on what is happening on my LAN IP scope and Charter tech support is pretty useless. My workaround is that I've static assigned an IP for each device in the same subnet as the router but it would be nice for the DHCP to function correctly.
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May 21, 2012
I've created a tonne of dhcp scopes on my routers before never had any issues, however this one will not hand out any addresses at all, i even give the router a reload to see if any magic happened but nothing, ive ended having to put a temp server in with just dhcp installed until i get the router diong what it should my config below, its something simple i havent seen, as ive compared it to plenty of my working DHCP configs and seen nothing.
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Jun 16, 2012
I have a LAN with about 200 computers (192.168.10.0/24) with a DHCP Server on Windows server 2003.The problem is that my company have acquired 100 others computers that I have connected on this network.Some computer does not get IP address from the DHCP server. When I investigated the log of the DHCP server, I realized that the DHCP server was out of addresses.
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Nov 2, 2011
Had a problem with a 3750 this morning not handing out DHCP addresses. The following is a sanitized config of what the switch is using. [code] The IOS installed on the switch is c3750-ipbasek9-mz.122-55.SE1.bin. What got my attention was that the sh ip dhcp pool PC showed 180 addresses being excluded. In doing the math from the dhcp excluded addresses, only 64 should be excluded.
My next step was to remove the second dhcp excluded-address line above. Doing a clear ip dhcp binding * started letting the DHCP service hand out addresses but the sh ip dhcp pool PC stil showed 180 addresses excluded.
It finally took removing the dhcp pool and putting it back in to drop the number of excluded addresses down to a value that matches the first excluded-address line. Didnt see a dhcp bug in the bug database that would explain this.
I tried re-entering the second excluded-address line from above and saw the number of excluded addresses rise as expected. When I negated the line, the number of excluded addresses dropped back to its previous value.
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Feb 23, 2012
Haveing issue with DHCP server handing out IP addresses to client connected to VLAN5 interface.ISP Router>Firewall -(WatchGuard Drop-in mode) I have several 3750 switches and one acting as a L3 switch. The L3 is configured as follow: [code]
If I connect a laptop to int fa1/0/10 I DO NOT get an IP address from the 10.100.0.8 scope. If I connect to another interface within the VLAN 1, I get an address from the 10.100.0.0 range.
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Apr 3, 2012
Have a client wanting to hand out public ip addresses to all clients from a PFSense Firewall terminating the internet connection.
How do I allow the Cisco Switches currently in place, configured with private ip addresses in the 10.10.x.x ranges and Vlans, where the main 3550 layer 3 has defined dhcp scopes for each vlan, to relay dhcp requests from all vlans to the PFSense firewall?
I assume I would take off the currently defined dhcp scopes for the vlans and configure each vlan/switch with the ip helper address and specify the PFSense firewall and that Nat would have to be disabled onthe firewall?
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Jan 10, 2013
We have a 3750 running IOS ver 12.2 (44) SE, it has performed great and we have never had a problem with it. However we have noticed that when we had an outage some of our Wireless APs didn't come up as they get DHCP from the 3750. The DHCP scope said IP was depleted although there were IPs to give. We had to delete and recreate the DHCP Pool. However two days later we got the same problem and then had to do the same thing over again.
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Apr 17, 2013
I have a DHCP server for a subnet that has only lightweight WAP's in it. The DHCP server is running on the gateway for this subnet which is a 3750X 2 switch stack running 12.2(53r)se2.I have the following configured:
ip dhcp excluded-address 10.1.10.161 10.1.10.162
ip dhcp pool DHCP-VL20
network 10.1.10.160 255.255.255.224
domain-name mydomain.net
dns-server 10.11.11.30 10.11.11.40
default-router 10.1.10.161
ease 3
The server hands out up to 18 IP addresses and no more, with 20 devices on the subnet. Scanning the subnet with a 3rd party network management system I see the following IP's never get handed out or used:
10.1.10.161 - 162 (manually excluded)
10.1.10.167 - 168
10.1.10.171 - 176
10.1.10.178
and of course 2 IP's I have manually excluded, 11 IP's in all that wont get handed out. It should only be 2 that don't get handed out. I've double and triple checked the exclusion and thats the only one. so I run a 'sh ip dhcp pool' and see this:
Pool DHCP-VL20 :
Utilization mark (high/low) : 100 / 0
Subnet size (first/next) : 0 / 0
Total addresses : 30
[code]....
[edit]I should also mention that "sh ip dhcp bind" does not show these randomly excluded IP's in use. They also do not show up in any arp table I can find.I have looked all over the config and I cant find where these extra 9 addresses are being excluded. how to free up these 9 seemingly random exclusions? Haven't issued a reload and I haven't deleted and rebuilt the DHCP server yet, production network.
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Oct 8, 2012
Why do we need them? Could we leave the LAN with a subnet broadcast packet (for instance with an address of 192.168.1.255 /24). Are those addresses used for something?
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Oct 4, 2012
I have a wireless access point, I want to be able to hand out addresses via the Cisco router through DHCP on the interface eth0/1. The wireless users that get an IP I want then route out the eth0/0 interface to my statically assigned default gateway. Right now Im not concerned with setting up security measures once this works I'll go back in and add that. Here is my running-config. Right now nothing from the 10.0.0.0 is being routed out to the internet.
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Oct 7, 2012
I have a customer who has an ASA 5505 that is handling the routing for their internal network. They are running out of available IP addresses on their subnet 192.168.1.0/24. They have dumb switches that don't suppport multiple vlans or trunking & they are only able to connect to one switchport on the ASA. He doesn't not want to purchase any new equipment or rearrange their existing equipment at this time. The customer would like to statically assign IP addesses for 192.168.1.x & 192.168.2.x and have the ASA hand out DHCP addresses for 192.168.3.x addresses. The customer suggested configuring a super subnet. A 192.168.0.0/22 address scheme would provide an ip range 192.168.0.0 - 192.168.3.255 on a single VLAN. I know this is an unconventional way to setup an internal network & I will definitely advise the customer that this should only be considered as a temporary solution until they get more appropriate network equipment.
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May 20, 2012
I'd like to add a name to a few ip addresses in the DHCP client table currently there is an asterix for a couple client names. the router is an ea3500.
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Sep 28, 2012
I have my other XBOXs connected to a 24 port switch but the one connected to the ea6500 directly gives me this moderate NAT issue. I thought this new router would be an upgrade to my old dlink but so far I get a new problem every day.I have reserved dhcp addresses for all the boxes and set up port triggering for the ports listed in several guides. But what else do I need to do? Is it likely I got a bad router?
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Aug 23, 2011
I have a problem with my 2 networks which are 1000 meters apart.One is my HOME the other is my CARAVAN SITE. both networks are working fine independently, the problem occurs when i join the networks together.I need to connect the said networks together in order to view my IP cameras which are dotted all around the campsite, i need to be able to view these from HOME.The problems i am having is DHCP servers are stealing clients from the other sides and directing them to the wrong gateway.please see below network map (these routers are all running DDWRTBelow is another network map which someone on another forum told me to do but its still not working. (DHCP servers are still clashing and still stealing clients)y the way, on both of the network maps all routers are connected with the LAN interface. someone told me to connect certain routers with WAN and it didn't work, or it was not explained correctly.Also please note that assigning clients with Static IP's is completely out of the question due to most of the clients being campers who come and go
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Aug 6, 2011
I have two locations both about 800meters apart, one is my home and the other address is a campsite where i have a linked router network (WDS with routers running ddwrt) where campers can all use the internet and also i have several IP cameras. Obviously both address have different gateways and therefore their own DHCP server. Everything was running perfectly until.I linked both of my address up using a long range antenna and now i am having problems.
Sometimes the two DHCP servers are competing with each other (i need both addresses on the same subnet in order to view my IP cams from home) and sometimes the computers log on to the wrong gateway. Its very annoying because the only way i can resolve it is by turning of the "linking routers" for a minute and then the Computers log onto the correct gateway. This happens to clients both side of the bridge. I have many different clients on both side of the bridge so assigning each computer (via windows) its fixed default gateway and DNS is out of the question as some of the clients are Camper's PC's and mine and my wifes laptops swap between both locations.
Now my query is, how can i block both DCHP servers from going over the bridge? OR can i have them on both separate subnets and still view my IP camera and still access all the routers from each subnet (i need this because sometimes i need to reboot the routers from home)
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Sep 5, 2011
How can i configure DHCP to use two different range of IP addresses. One range will be for example 192.168.0.* and the other range will be 192.168.1.* When the first range of ip is full the DHCP automatically assign IP addresses from the second range.
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May 25, 2011
I've just installed a 2106 Controller at a remote site. The Controller is seen by the WCS at the main site so, connectivity is good and I'm able to login from the main site. I've configured the DHCP server which is at the Main site on the AP manager interface and the Manager interface and on the WLAN of the new controller but, APs are not getting addresses.
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Oct 6, 2011
Netgear DG834 allocates IP Addresses using DHCP to 5 computers and 2 tills, the tills addresses and one computer IP addreess are reserved and fixed, so that data can be downloaded from the tills to this computer. However I had to re-format the computer and the Router now allocates a new IP address to it, which the tills cannot recognise, so I cannot download the data from the tills to the computer. Is it possible to change the newly allocated Computer IP address in the Router back to the old one.
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Dec 8, 2011
I imagine I can use the framed-ip-address attribute to assign ip-addresses but there seem to be support for static ip addresses only?A bit of a drag when we're talking 200+ nodes.
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Jan 19, 2012
I'd like to add a WRT54g2 to my LAN. I'd like it to communicate with my existing LAN router, and not to talk directly to the LAN. Therefore, in Basic Setup, I don't have the top part (Internet Setup) configured. Is that a mistake?But, it seems that when I enable DHCP, it hands out its own IP as gateway, and then doesn't seem to send the traffic on upstream. When I configure clients manually with the real router IP, they work fine.
So, I'd like, I guess, Linksys to forward traffic on a static route to real router. How do I do this? Adding a route to real router yields the error, "maybe default route already exists."
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Dec 2, 2011
A small network and uses the Linksys Router BEFSR81 as dhcp.the default Number of addresses is 50 and starts 10.0.0.100 to 10.0.0.149.A new Cisco IP Phone just introduced requires ip addresses and have noticed running out of addreses.Can I increase the number to 120 so that the address range would start from 10.0.0.100 to 10.0.0.219, also, I have a VPN device which automatically configures itself for 10.0.0.199 address and this is /24 network configuration.
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May 13, 2012
Initially there were 3 SSIDs configured but all of them were assigned a single interface and this interface was configured with the controller management IP address as DHCP server so that the WLC could assign IP addresses to wireless clients, guns and printers etc.
Issue: As part of PCI initiative, we decided to segment the traffic in multiple subnets based on type of wireless clients; so now there are 3 interfaces configured and each SSID is assigned a specific dynamic interface and each interface is configured to use the controller management IP address as DHCP server.
There are 3 scopes configured for each of the dynamic interfaces/SSIDs and DHCP proxy is enabled but wirelss clients are still being allocated IP addresses from the original DHCP scope that was associated with the dynamic interface originally assigned to all 3 SSIDs.
I verified the following:
1. Each SSID is assigned a different dynamic interface (Users, Voice and Handhelds)
2. Each dynamic interface is configured to use controllers management IP address as DHCP server
3. DHCP scopes configured with correct network information for each dynamic interface and enabled
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Apr 10, 2012
I recently upgraded a clients WLC and they keep saying they are unable to get an IP address from the DHCP server. It's a simple, flat network and here is what the logs are showing.
*apfReceiveTask: Apr 11 13:37:25.477: %SIM-3-DHCP_SERVER_NO_REPLY: sim_interface.c:1039 Failed to get DHCP response on interface 'management'. Marking interface dirty.
*apfReceiveTask: Apr 11 13:37:17.278: %SIM-3-DHCP_SERVER_NO_REPLY: sim_interface.c:1039 Failed to get DHCP response on interface 'management'. Marking interface dirty.
*apfReceiveTask: Apr 11 13:37:05.880: %SIM-3-DHCP_SERVER_NO_REPLY: sim_interface.c:1039 Failed to get DHCP response on interface 'management'. Marking interface dirty.
*apfReceiveTask: Apr 11 13:13:47.397: %SIM-3-DHCP_SERVER_NO_REPLY: sim_interface.c:1039 Failed to get DHCP response on interface 'management'. Marking interface dirty.
[code]....
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Feb 12, 2013
I have a LAP1142N that is connected to a 3560 nonPoE switch (using compatible power injector) that will not associate to the controller I have set-up. The wireless is existing and I have about 11 other APs connected to the controller with no issues. The AP will pull an IP address from DHCP running on the primary controller. The AP pulls a new IP address in roughly a minute. I set the pool to be 3 IP addresses and set a contant ping to each, there is about 1 request time out before the next IP address starts pinging. I went to the controller and pulled the following message error from the log.
*Feb 13 14:24:58.614: %LWAPP-3-HDR_ENCAP_ERR: spam_lrad.c:4216 Unable to encapsulate LWAPP header for discovery response; AP (APs MAC address)
*Feb 13 14:24:58.614: %APF-3-PDU_ENCAP_FAILED: apf_net.c:771 Failed to encapsulate a PDU for transmission to station00:00:00:00:00:00. Destination IP address not set in L3 mode.
I have tried a different cable, connecting to a PoE switch, different controller, larger DHCP range, hosting DHCP on the distribution switch, I am awaiting console access to the AP since this is remote work. The controller is running Software Version 5.1.151.0. Thoughts?
console inventory output from GUI
Model No. AIR-WLC4402-25-K9
Burned-in MAC Address XXXXXXXXXX
Maximum number of APs supported 25
Gig Ethernet/Fiber Card Absent
[Code] ....
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May 1, 2013
Have a WLC 5508 running 7.0.230 with internal DHCP server. Timeout is 3600 seconds. The IP addresses never seem to be released. The controller will show 70 clients but 254 addresses will be assigned.
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Jan 11, 2012
I currently have a the following configuration and am unable to get more than 2 DHCP addresses for the devices connected to the Cisco new SG 100-16 Switch.The AP have no trouble handing out DHCP to the wireless clients, but we are unable to get the SG 100-16 to be able to do the same thing to wired clients. It is currently connected to the 2960-8 in port 1. We can get 2 devices connected without a problem, but the 3rd machine and beyond do not work. Also, setting up a static IP does not work. Using a static will not even allow us to ping or tracer back to any devices beyond the SG 100-16.
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Feb 11, 2013
I have an ASA5505 which provides internet (just internet) for about more than 600 pc/laptops. Can 5505's DHCP support this number?
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Feb 7, 2012
We have a Cisco 5505 ASA fireawll at a remote site. I can get the firewall to issue the IP addresses to the pc's, Is there a way for the pc's to get their IP addresses directly from our DHCP server?
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Feb 2, 2013
I used to use a CentOS self-made server for intranet for my little office, but I bouth few days ago a Cisco 861 router to replace the linux box.
1. I have 2 public IP classes from my ISP. 1 class is limitted to 80mbit upload, the other to 30mbit upload. So I need some sort of DNAT to be able to know exactly which intranet computer uses big internet and which one limitted internet.
2. I need DHCP server and with static IP addresses (one computer must always have the same IP address, etc).. i have my needs for this.
3. Also I need external access to some servers inside (web, ftp, etc) [code]
So far so good, all looks simple and I can achieve this in 2 hours on a centos linux box (correct routes, ip forwarding enabled and few iptables rules for NAT/SNAT/DNAT).
But on this brand new Centos router well, i'm not even successful in pinging the outside world, nor the inside world I'm tired of reading the forums, the documentation..i want (at first) a simple scenario: vlan+dhcp, fa4 with 1 public ip address and ACCESS to the real world. I wasn't able to achieve not even that much. [code]
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Jan 20, 2010
The 1130ag was the LAP model but I upgraded it to run in autonomous mode. My understanding is that it cannot assign IP addresses but I just want that confirmed. It is not connected to a WLC nor a server that can do DHCP.
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Feb 23, 2013
I have a Wireless N router model F5D8236-4 v2 (01) with firmware 2.00.04 (Nov 12 2008 10:51:08) and it's not showing all issued wireless or Wired IP addresses in DHCP Client List.
They all have IP addresses and connect to the internet through the router, but in the router administration page, they're not listing. The Windows devices all show but most of the Mac devices are not, nor is my XBox 360.
My reason for investigating this is because the router seems to keep losing the Mac devices and a router reboot fixes it, but it shouldn't have this problem because all the Windows devices just seem to work.
According to the support page I have the latest available (dated November 12, 2008 which really seems kinda old to me for a Wireless N router). Are there any plans for a new firmware offering for this modem or have you already deprecated it as "legacy equipment"?
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Sep 28, 2010
I currently have DCHP server set up on my new 1141N. Everything works great, but I wanted to know if it were possible to make the DHCP server only hand out ip addresses on the wireless connection? Currently the AP is giving out ip addresses from the pool to wired and wireless pc's.
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Sep 9, 2012
Environment:
1. Core switch - Catalyst 6509e
vlans configured:
a. vlan 50 (wired clients)
[Code]....
here's the problem, wireless clients connected to WLAN guest keep getting DHCP leases from WLAN local 10.0.50.10 (scope 10.0.70.101 to 200)
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