PC Being Assigned Non-existent IP Range Over DHCP
Feb 18, 2011
I've got an issue with one of the businesses I work with. Just yesterday a PC had this problem, and this morning one more followed suit. These PC's were given a 192.168.35.x IP address when configured to take whatever the router gives them, however our Sonicwall TZ190 is configured to hand out a 192.168.20.x IP address over DHCP. There were no secondary IP configurations on the client workstation, no virii, nothing out of the ordinary. When I set a static IP on the client it works fine, but when I put it back to automatic it will once again give itself a 192.168.35.x IP (and subsequently have a gateway of .35.1, somehow). I've checked the router, there's nothing on the LAN side of the network interfaces besides 192.168.20.x.
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Dec 27, 2011
I've been using this setting for clients in small offices and what not, and since all they wanted was to give another nutch of security to their network, we've been intalling cisco routers 2600 series still outhere for their internet connections and we had no issues what so ever, not until we run into cable isp provider, and their dhcp wont be able to assign our interface a dynamic IP, this is the setting aplied to the router interface;
interface fastethernet0/0
ip address dhcp
ip nat outside
no ip redirects
no ip unreachables
no ip proxy-arp
Why it wont be seen or assigned an ip by their dhcp, I talked to their isp and they assigned a static ip (private one) and we still have the same issue, if i connect a pix 506e interface with the ip add dhcp assigned to it gets a dynamic ip right away...
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Jul 6, 2012
My ip address of my WRVS4400N changes every so often. when i use the ip assigned to connect remotely, it works until the ip is re-assigned through dhcp. I know there is a way around this bu ysing a name or something. I just don't know how to set that up.
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Nov 15, 2010
I'm configuring a Cisco 877 router as my firewall.My WAN IP will be assigned dynamically with DHCP. I will also get my default route from DHCP.I will need to configure ip inspection and packet filtering.I will need to configure NAT, I will eventually need to also configure a dial-up VPN.
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Jan 4, 2012
I just bought a Linksys E4200v2 router and updated the firmware to 2.0.26.124551. The DHCP server is turned on however, it won't issue any IP addresses. I have to set IP reservations for all of my devices in order for the router to give them an IP address. This includes my printer, xbox360 and 2 computers. I'm also having this problem with the wired and wireless lan.
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Jul 8, 2012
I am trying to setup VLANs and most of configurations are working ok now except IP address assignment from DHCP. If any computer in VLAN 120 or 130 configured with manual IP address, then all works fine. It can reach internal servers and the internet without problem.If the IP address is assigned automatically then any computer in VLAN 120 or 130 are obtaining IP address (strangely!) from VLAN 100. Because switch ports that connected to the computer belongs to VLAN 120 or 130, the computer cannot reach internal servers and the internet with ip address from VLAN 100 . All SVI interfaces for VLAN 100, 120 and 130 have ip helper-address option defined pointing to the DHCP server. No DHCP snooping enabled on all switches at this point. DHCP server have three scopes for the three different VLANs.
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Jun 24, 2007
Here at HQ we have a 4402 WLC. At our remote sites we have 1231G APs running in autonomous mode. I upgraded one of the APs -- IOS 12.4(3g)JA -- to run LWAPP. Per release notes I've read upgraded 1231's do not support REAP/HREAP mode, consequently, it's running in LOCAL mode.
The AP is managed by the WLC. I created a WLAN for the remote site and assigned it to the MGMT interface; the remote site subnet doesn't exist in HQ. The DHCP server for the remote site is presently at that site; AP and DHCP server reside at the same place.
Clients authenticate successfully to the remote site AP, however, they are not getting DHCP addresses assigned. Does the DHCP server for the remote site have to reside in HQ since the AP is running in local mode? If so, where is that specified, on the MGMT interface config?
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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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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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Mar 19, 2012
I have an e4200 set up and working on fios as a pppoe router properly with a dozen devices connected to it via dhcp. The dhcp range i configured in the e4200 is 192.168.1 100 to start with, and a mask of 255.255.255.0.
All the dhcp devices connected to the router start with 192.168.1.1xx. My Dell Inspirion with Windows 7 has an ipv4 address of 192.168.15.2. I cannot figure out how it gets this address, even after I release and renew the address on the Dell.
Everything is working fine so I guess there is something I just do not understand.
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Sep 19, 2011
How to delete non existent domain
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Nov 19, 2011
I keep getting some additional IP addresses logging onto my home network that have an address outside what should be allowed by the router. The server is running at 192.168.2.1 and is set to only allow clients from 192.168.2.2 - 192.168.2.10 so a total of 9 clients should be allowed on.The problem is that something keeps logging in with an address of 192.168.169.2 or 3 etc. Sometimes more than one device at a time.I have assumed that it is some automated or virtual client as I'm pretty certain my network has not been breached. I have a 9 character password with a relatively random alphanumeric combination, although I haven't tried changing the password (I live in a share house with with a bunch of devices using wireless, so I haven't yet bothered). What I don't understand is how it has connected with the xx.xx.169.xx range at all. I have a Belkin 'Share' Wireless N Modem Router and at some stage there was a 'guest' network but that has since been disabled and I still am seeing the extra address. I have attached a screen shot of the DHCP client list on the router.The following is a list of devices that may be on the network at times, I'm thinking one of these may be responsible for the problem:
Windows Vista Desktop - Only LAN device
PS3
Macbook
Epson wireless printer
Android HTC Desire Mobile Phone
Laptops running various Windows versions (XP, Vista and 7)
A few thoughts I had:
- the android phone is capable of running a wireless hotspot, may have to look into it to see if if has been operating as an access point into the Belkin router, but assumed this wouldn't bring up clients connected to the phone on the home router.
- The desktop has PS3 Media server installed to stream video to the PS3 over the network (not that I have ever managed to get it to work), however this is not ever open on the desktop.
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Apr 26, 2011
Using Android phone and have to set up Port Forwarding to access the cameras. I have to change the IP Address to a static one instead of the one issued by the Router. How do I change the IP Address of the camera to one outside the DHCP range?
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Feb 25, 2013
Region : Australia
Model : TD-W8960N
Hardware Version : V4
Firmware Version : TD-W8960N_V4_130205_Beta
ISP : TPG
I have an Optus Home Zone (mobile cell tower) that requires ports open.
Port
123 UDP
500 UDP
4500 UDP
I have assigned the Home Zone a Static IP outside the DHCP range and set the above Ports on the NAT, Virtual servers to that IP address.
I have used nmap to scan the ports and it provides open/filtered status for all of them.
Here is the kicker for me, i use a DGN3500 netgear (which keeps dropping WiFi hence its replacement) and enter the ports and it works straight away. Un plug and put the Tp-Link and nothing.
I use Eset Smart Security, could that be the problem?
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Mar 7, 2013
I'm currently taking a networking course and was having some difficulty answering the following questions and could use a little clarification.Question: When pinging a non-existent device on your subnet, why doesn't the source node issue a ICMP echo request.My thoughts on this was because there was not a receiving node therefore any ICMP packets were not issued.Question 2: when pinging another non-existent device but not on your subnet, why doesn't the source node issue a ICMP echo request.
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Jul 29, 2012
how can I show the DHCP-range of a router if I don't have privilege level? (not in enable-mode),I can do a "show ip dhcp pool" - this will show me the range which is configured with the network-command.But there are also some dhcp-exclude-addresses which I can't see.... (I did a test on a router with full privilege-access)I need this because I have a router with limited access from our provider.
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Apr 29, 2012
we have a 3560 switch configured with EIGRP with dhcp. We have a user that we cannot ping, however the interface show up / up and no errors on interface. the ip address is 10.2.0.199 - however we have dhcp configured to exclude the range from dhcp ip dhcp excluded-address 10.22.0.1 10.22.0.200 how can this work station get a dhcp address if we have that ip range excluded from the dhcp pool?
The user is off a different switch that is a uplink to this distribution switch. Traceroutes shows that the problem is with the distribution switch.
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Dec 14, 2011
ACE# sh script code NORDICID_PROBE.Error: Called API is invalid or non-existant.Hardware is ACE-4710-K9 and software A3(2.7)The probe itself is functioning ok according to show probe detail.However show script script_name probe_name -counters all remain at zero for some reason. This wasn't the case on the previously use ACE software.To my recollection the command show script code has worked successfully before on the same ACE software. Not 100% sure though, but it definitely worked on the previous software we ran on the ACE.
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Sep 2, 2012
Using a Cisco 1800 series router (1802) with IOS 15.1(4)M2.I am quite sure the following should somehow be possible in IOS, but I can't figure out how to do it ... :I have the situation that I need to bind specific devices by DHCP to the same IP range.
These devices (medical equipment, used in hospital) are all from the same vendor.So the first three octets in the MAC address (Organizationally Unique Identifier , OUI) are the same for each device. The next three are always 'unknown'.I know how to bind a fully known MAC address to a host ip or ip range , but is it somehow possible to do this by the OUI ?Like using some wildcard option.
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Mar 26, 2013
E4200v2, firmware 2.1.39.145204
Router says "Invalid IP address" when I try to make a manual IP address reservation of the IP address range.
Example: local network 192.168.1.0/24, where .1 is a router, .2 is a reservation, .20-.50 is a range for DHCP.
Before upgrade I didn't have this problem.
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Aug 6, 2012
On a number of 6500 chassis it appears that linecard 3 did exist at somepoint, but was removed.Problem is that when issuing the 'show int desc' or 'show ip int brie' the ports for the still appear, and indeed same with 'show run' and 'show conf'.
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Aug 27, 2011
I was changing some settings on the router, disabled the WMM QoS, and I can no longer see either the 2.4 or 5GHz networks. I power cycled, tried resetting to defaults but the wireless seems to be dead. I can manage it wired, but that does me no good.
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Feb 27, 2013
I have just bought two Cisco 3750 and stacked them. When in global config mode, The IP Routing Command does not exisit.
See Version below
Cisco IOS Software, C3750E Software (C3750E-UNIVERSALK9-M), Version 12.2(55)SE3, RELEASE SOFTWARE (fc1)
Technical Support: [URL]
Copyright (c) 1986-2011 by Cisco Systems, Inc.
Compiled Thu 05-May-11 15:40 by prod_rel_team
Image text-base: 0x00003000, data-base: 0x02800000
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Feb 1, 2011
I�ve assigned the static IP to Server, but when i go back to network properties it show Obtain IP address automatically, however, network working fine with previously assigned IP.
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May 29, 2011
I've read a lot of threads on this and tried a lot of the suggested solutions... nothing has fixed my problem yet.I'm running Windows XP SP2. I've recently been installing a VPN and setting up firewall rules. I didn't have any problems (was using Comodo firewall) until I installed Sygate Firewall. I've since un-installed but still can't get Windows to connect to the internet via wired or wireless connections[CODE]
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Sep 1, 2011
I have 2 servers. 1 is a terminal server windows 2003 sb terminal server.(working fine) and the other is server 2003 small business DC configured with dhcp, dns, SQL, & wins. Last week one of the network programs that is located on the DC started refusing connections.So doing some trouble shooting I noticed that when I ping the server name I get a local address of *.*.*.42 when the address the machine is assigned is *.*.*.5. When I do an Ipconfig /all on the DC it only shows the *.*.*.5 number. I look in DHCP and *.*.*.5 is reserved for the DC Computer. And the *.*.*.42 isn't even in the address leases. I have also looked through the DNS settings and see no alias with the .42 number. And the number does not show up in the reverse lookup zone either.
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Feb 6, 2011
I have set up DHCP reservations to assigned IP addresses based on MAC address. I have to block my kids access at times, and when I do this they simply change their IP address and they circumvent the blocking.Other than punishing the kids (which hasn't worked - and they need computers and Internet for homework), is there anyway to lock a computer to MAC address to IP address so if they change it they won't get network/internet access?I also tried to set up network filtering and I put in all the PCs and devices I wanted to provide access for, including the router, but when I save changes I can no longer access the internet or the router. I have to do factory reset to get back into router config.Also, I'm on 1.30WW. I know 1.34 exists, which I tried on a previous router which died and was replaced by RMA; but this didn't solve any problems.
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Jun 4, 2013
I have just set up my asa5505 and while in the sh run I have the following lines
-dhcpd address 192.168.2.200-192.168.2.231 inside
-dhcpd enable inside
-dhcpd dns 68.94.156.1 interface outside
When a client connects to the device like: 192.168.2.215 there is no dns assigned. My devices are unable to access the internet unless I manually assign the dns in the local settings for that host.
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Apr 11, 2011
I was trying to learn a bit more about routers and therefore tried to acces one of our routers using an external ADSL line at work.The router is a ZYxel Prestige 324. Since I did not have the password I performed a hard reset.Now when I try to acces any website I receive error 105 ERR_ NAME_ NOT_RESOLVEDThe only difference that I can see now is that there is no longer a connection specific DNS suffix assigned.Could this be the issue? If yes how can I configure this?
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Oct 12, 2012
using packet tracer, how can i find dns server ip address and i am having trouble pinging the desktops and server that i manually assigned the ip addresses to
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Apr 12, 2012
Is there any way to get an ip address through it's physical location? I was asked this by a friend and it's a good question. We know how to get the physical address by it's by coordinates, but is it possible to reverse it, getting the ip assigned to the physical address?
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Jun 12, 2011
I just rebuilt my network and I've encountered a problem with my wireless access. Right now I have a Dlink 2540B modem/wired router.To that is connected an 8-port Dlink 2208 Switch and a Linksys WRT110 wireless router. All the desktops connect via ethernet to the switch and everything is working fine. I just added the WRT110 and specified it would be a secondary router on the network but as soon as I got it connected it killed my internet. I assumed this was because of DHCP being enabled, which was true once I logged in and looked. I of course disabled it and now the internet is back up on the wired portion and I can connect to the wireless router as well. But the only problem now is that my wireless devices are not being assigned IP's at all. Specifically, my Mac says "airport has a self assigned ip address and will not be able to connect to the internet"How are IP's assigned to wireless devices that connect to the network via a wireless router with DHCP disabled?
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Feb 7, 2012
configure my cisco 892 router want a static ip address assigned to the interface because and I have no more internet on the router because am working on my network academy for CCENT?
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