Cisco WAN :: ASA 5505 DHCP Outside Interface
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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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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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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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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May 1, 2012
I have a Cisco ASA 5505 and I have my internal and external interfaces configured but I currently cannot ping from the inside to an IP Address on the outside. I had this setup and working and I have another set of equirement that I am replacing that is working with my service provider so I know it is a configuration issue. When I ping 4.2.2.2 for example I get:
Destination host unreachable
Do I need to add a static route from my inside interface to my outside interfaces?
: Saved
:
ASA Version 8.2(5)
!
hostname pxasa
[Code].....
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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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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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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 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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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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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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May 10, 2012
I'm using an ASA5505 with dhcpd.but i want to assign a specific IP address from the configured dhcp range to a specific PC.Is it possible to bind a specific ip to this particular PC's MAC address.
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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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Apr 14, 2013
I've got a 5505 and I'm getting a DHCP address from a cable modem. How can I show the DNS that the ASA is getting? show int vlan 2 is only givving me the IP and net mask.
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May 13, 2012
We recently upgraded our 5505s to 8.2(5) 26 and noticed that each will crash after a cerntain amount of time. Some crash every 30 minutes other will crash every 4 to 8 hrs. The only difference would be the user's home ISP and/or home router, if they have one. They are configured with a dynamic dhcp IP address for the outside interface and the crash files starts with the following:When we downgrade back to 8.2(5) 13 the problem goes away. Any known bugs for this version? I haven't been able to find anything yet. We do have one 5505 that does not have this issues. The only thing that may be different is that it was never at 8.2(5) 13. We had downgrade it from a 8.3 version.
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Apr 1, 2012
I'm running a 5505 with DHCP on the outside interface. All 5505 are connecting to 5545.Can I configure the ASA for a site to site to automactically discover the the peer address and automatically establish a connection with 5545?In other words can I configure all settings for the site to site except the peer address. Once connected on network and get outside DHCP, can it also put that address is the peer section of site to site?
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May 17, 2013
Well its in this line but do i have to type in a ip even if comcast is giving me a dhcp address?
route outside 0.0.0.0 0.0.0.0 any 1
=============================
hostname asa1
domain-name mydomain.com
enable password rwt5UQJihEq2/Qae encrypted
names
!
interface Vlan1
[code].....
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Dec 4, 2011
I am opening a small branch office in another state and the equipment we purchased is as follows:
ASA5505
3560G.
We'll use a site to site vpn but just in case there's connectivity issues I'd like to use the ASA as DHCP. So far I have a scope defined in the ASA and if I plug a laptop directly in I get an applicable IP address. I trunked the port on the switch that goes to the ASA but not the one on the ASA itself (license restriction) The VLAN that I'm using for my PC's has an ip helper address that is assigned to the inside IP of the ASA.
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May 16, 2011
I need to configure one interface in failover because the client has 2 ISP.[CODE]
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Dec 10, 2012
I want to creat sub int on ASA 5505 but when I am trying below command it show error.
------------------------------------
config t
int f0/0.3400
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My ASA software version is 8.2(5).
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Jun 12, 2013
Few week ago we purchase Cisco ASA 5505 as replacement broken Dlink DFL800. I try to configure all setting like it was on DLink, and all work fine with exception of one thing.
We have some resource like terminal server, that placed in internal network with configured static nat on ASA, some users use it from internal network and some from internet, but both of them use one DNS name for it like terminal.%company_name%.ru. all work fine for internet users when they try to reach server from internet with but internal users unable to use external ip, they even unable to ping external ip address from internal network. Yes i know that one way to solve this problem, is just to use internal DNS server so it can resolve terminal.%company_name%.ru in to internal ip address, BUT i want to know does exsist any way to "loop" trafic this way?
In DLink config there was 3 string in config that solve this problem
<IPRule Name="RDP_Terminal" Action="SAT" SourceInterface="any" SourceNetwork="all-nets" DestinationInterface="core" DestinationNetwork="InterfaceAddresses/wan1_ip" Service="rdp"
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May 13, 2009
Can we make sub interface on Cisco ASA 5505 model and if its possible then do that interface need to be upgraded into Trunk Port.
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Feb 23, 2011
We have many new and very small remote sites that will be connecting via an ASA5505 using easy VPN. Works without an issue and we've got the configuration and process nailed down.
The challenge I was presented with today involve non-standard remote sites where I need to configure a third interface on an ASA 5505 and allow it to pass directly to the Internet and not go through the VPN. Configuration of the third interface, assignment and configuration of the ACLs / NAT(PAT) are straight forward.
The challenge I face and haven't been able to find a direct answer to is if it's possible to have the traffic bypass the easy vpn network extension process. At this time the traffic is going down the tunnel which isn't what I want.
I fear I'll have to build classic site-to-site VPN configurations which isn't a huge issue though it breaks all maintenance/operations methods, processes and I'll have to spend time training the support team how to detect the differences.
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Dec 23, 2011
I want to configure multiple DHCP pool on ASA. that I create like
int e0/2
no shut
interface Ethernet0/2.10vlan 10nameif inside10security-level 100ip address 192.168.10.1 255.255.255.0
interface Ethernet0/2.20vlan 20 nameif inside20 security-level 100ip address 192.168.20.1 255.255.255.0
dhcpd address 192.168.10.10-192.168.10.254 inside10dhcpd dns x.x.x.x y.y.y.y interface inside10dhcpd enable inside10
dhcpd address 192.168.20.10-192.168.20.254 inside20dhcpd dns h.h.h.h z.z.z.z interface inside20dhcpd enable inside20
I have following query...
1. int e0/2 work as trunk port, is it? any special confiduration require other than dot1Q?
2. How can I configure inside interface? is it like,
access-group inside_access_in_1 in interface inside10
access-group inside_access_in_1 in interface inside10
3. How can I configure static NAT ?
4. How can i configured inside route?
5. How can I configured default NATing?
6. On which interface I access ASA? currently using inside interface.
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