Cisco WAN :: 2600 - IP Won't Get Assigned To Interface By ISP DHCP
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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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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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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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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Jul 27, 2011
I'm new to working with the ASA 5505 ,VPN and reverse NAT.
The basic setup is as follows. I'm trying to setup a IPsec site to site tunnel with reverse nat on the remote side.
I have as the tunnel up and it passes traffic. I have setup reverse NAT for 172.x.x.1 to translated IP 216.x.2.101 my ASA also has an IP address of 216.x.2.102.
Any connection from 172.x.x.1 to 216.x.2.1 should appear to be comming from 216.x.2.101
When I ping or telnet from 216.116.86.1 to an open port on 216.x.2.101 I get the banner from 172.x.x.1, seems like it is working.
However in my setup I'm only given a singel IP that of the NAT address 216.x.2.101, so when I remove the IP address assigned to the inside interface 216.x.2.102. all conductivity is lost.
When I set the inside interface to 216.x.2.101 and I setup a static NAT rule for 172.x.x.1 to 216.x.2.101, I get a message that says all traffic will be redirected and I will be unable to connect to the ASA.
Once thats in place, and I make any connection from 216.x.2.1 to 216.x.2.101on any port I get a connection but then it's reset, I no longer get the telent banner I was expecting.
My running config is,
ASA Version 8.2(1)
!
hostname ciscoasa
[Code].....
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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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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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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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Feb 7, 2013
So I have a 2600 that I have configured three sub interfaces on. FA0.0.1 is set for DHCP and supports VLAN 1. FA 0/0.2 for Voice, FA 0/0.3 for Data. I have this router interface plugged into FA 0/24 on my 3550 and the 3550 is configured as a dot1Q trunk (I have attached configs for RTR and SW).I have most ports configured as access VLAN 1 which is where i have my ISP connection plugged FA0/1 on the 3550. When I connect the service provider link FA0/0.1 never picks up an address. If I take my internal DHCP server and connect it to FA0/1 of the 3550 it snags an address almost immediately.In my mind this validates that my config is fine. I also took the same cable from the service provider cable modem and connected it to my laptop and the laptop is pulling DHCP.
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Feb 14, 2012
does Cisco 2600 series switch support 802.1x and DHCP snooping?
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Apr 2, 2013
I have just setup a new WLC 2504 controller to manage a WiFi service that will span 6 geographic locations. The local networks at each location are on different subnets (all 192.168.x.x) and are linked up via IPSEC VPN links, and there is Active Directory spanning the sites, with DNS and DHCP servers running at each location.
I tested the WLC at our main office with a single AP, and it worked fine. The AP set itself up, and wireless devices connect with no probs. Great! Yesterday I headed out to one of our remote sites, and connected an AP to their network - and that seemed to work fine too. Within a few minutes I was able to see the WiFi network I'd setup, and my smartphone connected to it straight away (as I'd rpeviously connected at the main office), so I was pretty happy that all was working well.
This morning however I've had notification that wifi performance at the remote site isn't great. I've got someone to check their ip address, and I've found that their IP address and default gateway match the LAN at the main office where the WLC is based - NOT the LAN where the wireless client is. Obvioulsy this is not ideal!
(I guess I HAVE done something wrong!?). And how can I get wireless clients at remote sites to pick up an IP from the DHCP server at THEIR site?
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Mar 17, 2013
i have a simple router on a stick config which is providing dhcp to a customer SSID. however i don't want employees to stay on it and eat the band width since its open. the lease is set to an hour, is there anyway that i could set it so that once your lease expired it can't be renewed for 4 about 8 hours? I am using a cisco 2600 router in this setup.
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Jan 21, 2013
I configured a Cisco 881 as a vpn-client.When I configure the wan-interface with ip add dhcp , it never gets an IP-address.When I remove the crypto map from the wan-interface , the interface gets an IP-address without any problem.According to examples in the Cisco documentation, I should work; and it works on a 831.
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Feb 21, 2010
I have an ASA 5505 configured to get a DHCP'd IP address from the ISP on it's outside interface. The problem I am seeing is when the ISP renews their IP address, the ASA 5505 is still holding on to the old IP address information. I have to either manually renew the IP or reload the ASA. I have the potential of rolling out hundreds of these devices and I would not like my customers to have to reboot their ASA everytime the ISP's DHCP lease experies. I am using an easy vpn autoconnecting to an ASA 5520. Static IP's are not an option on the outside interface of the ASA 5505's.
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Mar 14, 2013
on the outside interface i cant perform the command ip address dhcp setroute.I get the error: IP and subnetmask form invalid pair indicating broadcast or network address.The commands are there when I do the ? command. It just will not accept the command with or without dhcp.I am trying to test an ASA-5510 as a 4G failover to our ASA-5520. This is Verizon's solution but they did not provide IPs, they use passthru on the 4G modem so I'm trying to set up dhcp. It worked a few days ago. Not sure what Im missing. The IP I got last time from Verizon was 192.168.0.199.
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Mar 1, 2011
I have a 6509 with SUP2 w/msfc2 at home, I am currently have dsl for internet with static IP addresses. Due to AT&T not wanting to support faster speeds in my area, I have to look at another option. All of these will be dynamic IP addresses, cable, uverse, etc.
I need to be able to enable dhcp on the wan interface so I can connect directly into one of the gig ports (either on SUP2 or 6316) or on a 10/100 port on a 6348.
I have the following image installed s222-adventerprisek9_wan-mz.122-18.SXF13.bin, according to Cisco's feature tool, it is supported.
I have tried "ip address dhcp" on the interfaces but they will only accept "ip address x.x.x.x", I looked at "ip dhcp" as well and only get the option for "relay".
I would hate to have to put something else in the mix to handle the dhcp portion. I may be keeping the adsl for my mail server traffic and backup in case of an outage on the new provider. So I need to be able to track if a link is up.
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Nov 21, 2011
I've been running a cisco asa 5505 for quite some time and it has been running fine, now all of a sudden it starts to renew it's outside dhcp adress like every 2 hours. I dont think it's the ISP since I have another device connected also using dhcp to the same ISP and it doesnt renew itself, it's just the ASA. Rebooting it, makes it pick up an adress straight away. The interface seems to be up, the GUI just reports "no ip adress" and then the ASA get's a new IP after about 10-15 min without one. Pressing the renew IP adress button in the GUI throws an error.
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Jan 8, 2012
I currently have the managment interface set to my internal network using our DHCP server. We also provide another interface to WLAN for a chartity organization. Their interface and WLAN are locked out of our network (no routes, no nothing) with only VLAN tagging sending out over our backup internet connection. I have been tasked to take over their DHCP scope (255.255.240.0). I added the scope into the 4404 just fine but can't seem to assign it. So, for the sake of argument lets say:
Interface:
management VLAN 10 10.10.10.10 DHCP = 10.10.10.15
charity VLAN 20 192.168.160.2 DHCP = ????
[Code].....
If I tell the charity interface to use 192.168.160.2 for the dhcp scope it errors out. I also tried the DHCP override in the WLAN with no success. If I set either DHCP option for the charity to aim at the managment interface it does nothing as it can't find it..
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Dec 26, 2010
We have a Cisco 886G router connected to the internet. The router receives an ip address. We experience however a problem when the lease time expires. The router does not send a DHCP request to renew it's ip address in time. This causes an interface reset, and connectivity loss, after the lease time of 8 hours.
We are running IOS 880data-universalk9-mz.151-3.T.bin. Config on DHCP receiving interface is:
interface VlanX description To Internet MODEM ip address dhcp ip access-group TEST in!
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Apr 21, 2013
i have a adsl modem that is sending dhcp reqeust and i want to use that on my cisco switchs 3560 48 ports.i want to use the interface port 0/48 as a WAN connection and i want to use the other interfaceports for DCHP pool.i have an d-link (dir655) router at home and i want to have the same situation on my cisco switch my WAN interface get from a DHCP reqeust an ip adress from the provider like 10.10.123.44 (for the cisco switch would this interface port gig 0/48)then i want to configere my LAN as a DHCP pool like 192.168.0.1 (for the cisco switch would this interface port gig 0/1 - 47 .
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Jul 10, 2012
i have WLC 5508 showing the below Logs , which prevent the users from connecting to the SSIDs , also its disconnecting the associted users DHCP Socket Task: Jul 11 09:54:08.992: %SIM-3-DHCP_SERVER_NO_REPLY: sim_interface.c:1039 Failed to get DHCP response on interface 'interface-02'. Marking interface dirty.*mmListen: Jul 11 09:54:08.638: %MM-3-INVALID_PKT_RECVD: mm_listen.c:7671 Received an invalid packet from 10.21.1.25. Source member:0.0.0.0. source member unknown.it shows 3 to 4 times durring 1 hour ,
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Aug 2, 2012
I'm running a system that requires a third (and potentially fourth) DHCP server to be setup on each network in my network. The first two devices are Windows DHCP servers serving IPs from different address ranges for failover. The third DHCP is just a listener to receive OS information and device names to be logged in a database.
Currently this works like a charm for my wired clients as I can add in the third and fourth ip helper-address on each vlan and the information is received by the listeners. However, I cannot find anywhere in my WLC5500 to setup these extra two DHCP helper addresses.
The wireless vlan on my layer 3 switch has all the ip helper-addresses, but this doesn't seem to work, and the devices just use the DHCP servers set on the interface in the WLC.
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Jan 22, 2013
I would like to configure the 881G to use both the cellular interface and Fe4 WAN port for internet connectivity.Interface Fe4 is connected to an ADSL router.
I have configure each interface with a default route and weighting:
ip route 0.0.0.0 0.0.0.0 Dialer0 200
ip route 0.0.0.0 0.0.0.0 FastEthernet 4 100
I need to configure Fe4 to get an address as a DHCP client:
interface FastEthernet4
ip address dhcp
no shut
duplex auto
speed auto
How do I remove Fe4 from VLAN1? There is some existing config around VLAN 1:
interface Vlan1
ip address 10.73.0.1 255.255.255.0
ip helper-address 192.168.140.13
ip tcp adjust-mss 1400
no autostate
ip sla 100
icmp-echo 10.64.4.15 source-interface Vlan1
tag 3G Keepalive
frequency 10
Then I guess I need to adjust my Internet-IN ACL to allow broadcasts and UDP 67 and 68?
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Feb 26, 2012
I'm trying to find out what is the minimum downtime for a Cisco 2800 series LAN interface configured as DHCP client, in order to initiate a new DHCP discover. How much time does it need to take for the Cisco to "sense" the phy disconnection ?
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Feb 25, 2011
I am used to setting up access-lists on outside interfaces with ip addresses that are static. I have recently been given a site that is using a dyndns.org client for name to ip address resolution on an outside interface that is dhcp assigned. I created an access-list to open up ports 41794 and 41795 to an engineering application but everytime I try to connect from the outside I get a syn timeout. The application works when inside the lan. Basically I want to allow outside connections from anywhere on the outside to go to ports 41794 and 41795. I am running a Cisco ASA 5505 on version 7.2(4) Below is my conifg. what I may have misconfigured?
: Saved:ASA Version 7.2(4)!names!interface Vlan1 nameif inside security-level 100 ip address 172.31.2.1 255.255.255.0!interface Vlan2 nameif outside security-level 0 ip address dhcp setroute!interface Ethernet0/0 switchport access vlan 2!interface
[Code].....
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Apr 5, 2012
I've got a new CT2504 controller with software version 7.0.220.0 Regarding to [URL]I've tried to configure the internal DHCP on a dynamic-interface, but this is not possible:(Cisco Controller) >config interface dhcp dynamic-interface vlan401 primary 172.16.x.3 vlan401 Interface IP can not be used as internal DHCP server IP It works, if I use another IP (aka DHCP server) in the same subnet or in another subnet. It works also for the management interface.
(Cisco Controller) >show interface detailed management
Interface Name................................... management
MAC Address...................................... d0:c2:82:xx:xx:xx
IP Address....................................... 10.2.x.135
IP Netmask....................................... 255.255.255.240
IP Gateway....................................... 10.2.x.129
[code].....
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Jan 29, 2011
When I click on "DHCP Reservation" button in the web interface of the E3000 I don't see any information about the current devices and the reservation list.This problem occurs when my sattelite reciever tries to get an IP address from the DHCP.the name of the receiver is "dream box" (no special characters).I didn't have any problem in the past with my previous router (3COM)Since there are error messages in the page (screenshot is attached), I've tried to use different browsers but the result was the same (Firefox, Safari, IE 8)
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Nov 8, 2011
I am looking for a way to bind between a switch interface (cat 3750X) and a DHCP server reply.The switch can operate as the DHCP server .a PC connected to interface Gi 1/0/1 will lways get IP address 10.0.0.1 because it is connected to interface Gi 1/0/1, a PC connected to interface Gi 1/0/5 will lways get IP address 10.0.0.5 because it is connected to interface Gi 1/0/5 and so on... (no matter the source MAC address who sends the DHCP request).
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Feb 24, 2013
I have a cisco wlan controller (2100) running software 7.0.235.0. I have the internal private wlan running off of port 1 and that is working fine with an internal dhcp server.Is it possible to setup another ssid (guest) and have the interface directly linked to a static ip on the WAN and also use the built in cisco internal dhcp server?
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May 8, 2012
Is there any way of showing the currently assigned ip address for an interface configured to use DHCP on an ASA 5505?
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May 9, 2012
We've just started with the ASA 5505. We do run a DHCP server on the inside interface, so it is in the same VLAN 1 as all of the clients. However, we cannot get it to work.We can't use DHCP Relay, as the ASA 5505 only allows to relay to DHCP servers in a different subnet.Or do we have to move the DHCP server to a different subnet. If so, how would we configure that scenario?
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Nov 7, 2012
How do i get the 12.4 code to assign a dhcp address to my ethernet interface from my server? I deleted the default config on the 1141 and searching has not turned up anything useful.
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