Cisco Firewall :: 8023 / External Access To Internal Router Via ASA

Dec 31, 2012

I am aware that we can allow external admins to telnet over a custom port to the internal router. Even i was allowed to connect to a remote router via the remote firewall. The way i was accessing the router is by telnet to the remote ASA address on port 8023.I am not sure how exactly we can configure this on a ASA.

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Cisco Firewall :: ASA 5505 / Allow External Traffic To Access Internal Computers

Mar 22, 2012

We have an ASA 5505 running version 8.4. We are having problems allowing external traffic to access computers behind the firewall. Our current config is:
ASA Version 8.4(3)!hostname ciscoasadomain-name default.domain.invalidnames!interface Ethernet0/0switchport access vlan 2!interface Ethernet0/1!interface Ethernet0/2!interface Ethernet0/3!interface Ethernet0/4!interface Ethernet0/5!interface Ethernet0/6!interface Ethernet0/7!interface Vlan1nameif insidesecurity-level 100ip address!interface Vlan2nameif outsidesecurity-level 0ip address!boot system disk0:/asa843-k8.binftp mode passivedns server-group DefaultDNSdomain-name default.domain.invalidobject network a- network a- network ext-serversnetwork-object host host host network ecomm_serversnetwork-object


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Cisco Firewall :: NAT Two Internal IPs To One External IP In ASA 8.4?

May 6, 2013

I found a link to accomplish this on the old code but how can I get this done on 8.4. 


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Slow To Access Internal Sites Via External IP

Jul 17, 2012

Our secondary site accesses the internal intranet via a link, which is basically:

[URL] where externalip is the IP address of my router.

* This used to work fine before we migrated from ADSL (6mb up / 0.5mb down) to Fibre(70mb / 20mb) *

Internally, I access the same link, but via [URL] Internally it loads in 2 seconds, externally it is taking 68seconds(ish)..

I can't work it out, the fibre shouldave made things loads quicker but is infact very slow. I'm wondering if something network wise is going on.

The intranet is a php intranet sitting on apache, and using postgresql as the database. Other pages load fine, this specific index.php page does quite a lot of DB connections and so on, but as I say before, it worked fine before the migration.

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Linksys E3000 - Internal / External LAN Firewall Setup?

Oct 20, 2012

I have Astaro UTM running on an old computer as my only firewall right now. The Astaro also serves as my DHCP server. My Wifi is provided by a Linksys E3000 running DD-WRT software. NAT/SPI are disabled on the E3000, and it forwards DHCP requests to the Astaro. All my network clients connect via wifi/ethernet to the E3000.

All clients --> E3000 (no firewall) --> Astaro --> www

I am considering setting up my own personal cloud server using a Synology NAS that I can access remotely. I would also like to remotely access my Surveillance DVR. I would like to access them via VPN or portforwarding. I do not want to use DMZ.

I would like to utilize the SPI firewall on the E3000 to provide an extra layer of defense. I would like the NAS and the DVR to be on an external LAN between the Astaro and the E3000...and all other clients being on an internal LAN behind the E3000. I have the necessary switches/cables to make this work.

My question is...How do I configure the E3000? Can I have both the internal and external LANs on the same subnet? Do I have to use the NAT on the E3000? I'd rather not...since that will render the Astaro's reporting functions rather worthless.

I would like the Astaro to remain the only DHCP server. I would like all internal LAN clients to be able to reach out to the external LAN/WAN...but the external LAN should not be able to reach into the Internal.

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Cisco Firewall :: Accessing Internal Sites Via External IP 5505

Jun 4, 2012

I have a Cisco 5505, 2 sites that are internal, 1 external IP (dhcp from cable modem).   While on my laptop, ipad, iphone, I cannot access the server via it's external IP address.  I MUST use the internal IP in order to access this site. I have heard of hairpinning, internal dns server(don't really want this).

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Cisco Firewall :: ASA 5505 Internal Address To Forward From External One

May 30, 2013

I have an old ASA 5505, and I'm having some trouble with Nat Hairpinning. I've done this with other firewalls before and I am having no luck now. I have an internal address that I wish to forward from an external address- so if someone goes to 123.456.789.012:3456 then it will forward to (All numbers are arbitrary here- only for illustration). I have and Access Rule and NAT and PAT set up so that I can get in if I originate from outside the LAN. What I am trying to do is to have this work from inside the LAN as well- so that if I am at my desk, and I connect a device and type in 123.456.789.012:3456, it will deliver the content at The problem I am having is that it just isn't working, and I cannot figure out why- When I started here, there was an address configured to work this way, and it still works- I just cannot find what is different between what I am doing and what the person who configured it did.

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Cisco Firewall :: ASA 5510 - Connecting To External IP Of Internal Server

Sep 25, 2012

I was just wondering if it's possible with an ASA 5510 to connect to the external IP address of an internal server from inside the network.  I have already set up dns doctoring for dns lookups, and everything is working fine there.  We have an application inside the network that tries to connect straight to the external Ip of another internal server.  where to look in the ASDM 6.4?

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Cisco Routers :: RV 120W Can't Access Internal Servers By External Addresses

Oct 13, 2010

I recently cut over from a WRT54G to a RV120W.  I am having an issue where I type [URL] (for a server running on my network) in my web browser while on the internal network and it always comes back with the router login page.  Basically it is supposed to go out of the router and then come back in on the public IP address and hit that server.  There was a function on the WRT54G called "Filter Internet NAT redirection" which when turned off would allow this to happen.  I am not seeing a feature like this on the RV120W

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Cisco Firewall :: 6500 Separate Internal Server / HQ Network From 3 / 4 Different External Connections

May 21, 2012

I am using a 6500 with FWSM. I need to separate an internal server/HQ network from 3 or 4 different external connections. The external networks do not necessarily need to be isolated from each other.I have the option of using a 3 layer model: L2 Access layer to SVIs on the Distribution layer and then L3 to the 6500.L2 Access, connecting directly to the 6500s, with the SVIs on the FWSM.Is it better to have the FWSM outside the MSFC or Inside? Am i correct in thinking that "inside" vs "outside" is determined by whether the SVI's are configured on the FWSM or the MSFC? is there any performance impact from having the FWSM doing the routing instead of the MSFC.If the vlans are all configured on the FWSM, what is the 6500 doing, other than providing switch ports?

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Cisco Firewall :: Statically PAT Multiple Internal Hosts To One External Host 5510

Feb 20, 2012

I am working on replacing our Checkpoint Firewalls with ASA's, and am running into the following NAT problem. On some of our Checkpoints, there are external NAT's that are mapped to multiple internal hosts based on ports.Is there any way to translate that to the ASA? I'm not sure the ASA will let you have multiple internal hosts mapped to one external IP using static NATs. The main issue, is these are alarm panels that receive data from external hosts (the traffic is initiated externally on the Internet) so I can't use dynamic PAT with this.

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Linksys Wired Router :: RV042 / One-To-One NAT From Internal To External IP?

Mar 10, 2012

I am converting from a Cisco Model 850 to a RV042, all is well so far but I cannot implement one feature I had on the old router.I want to do one to one nat from one internal ip to one external ip but I only want to use one tcp/ip port.The command to do this on the old cisco 850 was this:"ip nat inside source static tcp 80 80 extendable"Can this be done with the RV042?I can do one to one nat but it include all ports.

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Cisco Firewall :: ASA 5505 To Have Internal Address That Wish To Forward From External Address

Jul 8, 2012

I have an old ASA 5505, and I'm having some trouble with Nat Hairpinning. I've done this with other firewalls before and I am having no luck now. I have an internal address that I wish to forward from an external address- so if someone goes to 123.456.789.012:3456 then it will forward to (All numbers are arbitrary here- only for illustration). I have and Access Rule and NAT and PAT set up so that I can get in if I originate from outside the LAN. What I am trying to do is to have this work from inside the LAN as well- so that if I am at my desk, and I connect a device and type in 123.456.789.012:3456, it will deliver the content at The problem I am having is that it just isn't working, and I cannot figure out why- When I started here, there was an address configured to work this way, and it still works- I just cannot find what is different between what I am doing and what the person who configured it did.

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Cisco WAN :: 2800 Setup Router To Resolve Both Internal / External DNS Requests

Jun 3, 2012

I have a 2800 with one Gigabit interface connection to our Lan and the other interface connected to the internet with a public IP address. Now I'd like to setup the router to resolve both internal and external DNS requests. Thus requests like and LocalLanPcName should be resolved to their public and private IP's respectively. [code] When I ping any name the only DNS server that is ever queried is (it does resolve internal name correctly though).

None of the other servers are attempted to resolve the name. It does not matter if I specify a FQDN or not.
How do I setup the router so that my internal resolution is handled by and .201, while external resolution is handled by 41.160.36 and .37. Or alternatively, how do I configure it to at least try all 4 specified name-servers for resolution, and not fail after trying the first one unsuccessfully.

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Cisco WAN :: 2600 - External To Internal IP NAT?

Jun 10, 2013

I have a 2600 I am trying to setup for educational use. 
My Cable ISP has issued me 5 routable IP's through their SMC modem  The SMC modem is .225.  Currently the internal network can get out through .229 as expected but nothing outside (tcp 80 to web server) can get through.  When I assigned the ip's to e0/1 as secondarr I could get it to route from the inside network (so hitting .226 80 went to the correct place) but it still didn't work from the outside - plus I read that wasn't a great way to do it anyway.

interface FastEthernet0/0
description LAN Interface


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External IP To Internal Device?

Sep 22, 2012

I have a checkpoint Safe@Office 500 firewall router, connected to adsl via another adsl device in bridged mode.We needed to assign an external IP to a device behind the firewall.We contacted the ISP, and now they have assigned an additional IP to our adsl account.I have read from the documentation that:"NAT can be defined automatically via the network object (Node, Network or Address Range). When you define NAT via the network object, rules are automatically added to the Address Translation Rule Base" I add the object, with the external IP given to us by our ISP, and the wizard simply complains that the IP address is invalid.My thoughts are that the router does not know about the additional IP provided by our ISP. If so, how do I tell the router that there are other IP addresses available to use? I have rebooted the router, and no luck.

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Connect Using Rdp From External To Internal Ip?

Jun 20, 2011

i can can ping my host externally from another ip however i have left my house without port forwarding to my pc is there a way to connect to my pc via something like this command "" i have tried this and does not work as it does not like the ":"truth be told my real goal is to ultimately be able to look at my webcam as it is pointed at a homebrewing project which i need to see. this is what i want to work on setting up while in rdp?

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Cisco Firewall :: Can't Access Internal Servers From Behind ASA 5505

Apr 3, 2013

I am having some trouble accessing some backup Email (Outlook Web Access) and Citrix servers located behind an ASA 5505 firewall at a remote datacentre. Simply put, when I go to the specific URL (e.g. [URL]) I do not arrive at the splash page, I just get a message saying that the server took too long to respond in the web browser. I'm wondering whether I have missed something on the configuration or the firewall itself is not letting my requests through. The remote servers are located at a remote Disaster Recovery site and use the subnet I am at head office which is connected to the DR site via a VPN using

[Code] .....

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Cisco :: ASA5505 Change SIP Internal Address To External One

Sep 15, 2011

The problem is that the PABX is sending out an internal address in it's INVITE messages and the ASA5505 isn't changing the internal address to the external address.We need> From: Calling Number <SIP: SIP Username@Public IP Address>However our PABX sends out> From: Calling Number <SIP: SIP Username@Private IP Address>. How to translate the internal IP address to the external IP address on an ASA 5505?

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Cisco Wireless :: 2504 - Using Both External And Internal DHCP On WLC

Nov 25, 2012

I am wondering if the folowing is a valid configuration:

I need 3 SSID/VLAN, 1 for corporate devices, 1 for coporate smartphones, 1 for guest.

Port 1 on the 2504 should be used for management and corporate devices and connect to the corp network. Port 2 is for smartphones/guest and will be connected to a Cisco ASA 5515 that is connected to a second ISP.
Corp devices should get IP from an Windows DHCP. Smartphones/guest should get IP from the WLC. Is this possilbe? I read this in a document "To use the WLC as a dhcp, you need to enable DHCP proxy as it is required." Some how I am imagining that this will mess with the Windows DHCP. Is it better to use the ASA as DHCP for smartphones/guest?

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Cisco WAN :: ASA 5505 - Assign External IP To Internal Server?

Mar 2, 2012

I have 3 external ips from my isp:

The first one I use to provide internet access to my office. The other two I'm going to use for the following: I'm going to deploy a server in internal network which must have 2 external ips on his network interface (& one internal ip on the second,but that's ok: I cannot put an extra network switch before asa & plug this server there: this server is virtual & is on esxi host in internal network. External ips must be assigned to servers' interfacw,bot just forwarded there (ms direct access requirement).

My current config:
ASA Version 8.4(3)
hostname msk-office


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IPConfig Is Not Recognized As Internal / External Command?

Jun 29, 2011

I can hear nothing sound driver disabled... windows explorer wont open...and my notepad and calculator wont work either... how do i remove it..

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Cisco Firewall :: 2801 Cannot Access External Websites That Use FTP

Dec 26, 2012

I am having an issue where I cannot access certain files on websites. It looks as though the files are accessed via ftp. Could my router be blocking it. I have a Cisco 2801 router acting as a firewall.

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Cisco Firewall :: 5510 - Can’t Access External IP From Within LAN

Oct 20, 2010

Basically we have different customers using the same 5510 firewall. We have created one sub interface for every customer on the inside interface. There are differed NAT rules for every customer all using the same block of public IP addresses on the outside interface. They do not have access to each other’s network so I cannot make any exemption rules between two sub interfaces. The problem is for all our customers that they cannot communicate with each other over Internet, Email, Applications etc. using the external IP address. A work around is to use a proxy server, but they do not agree with that. I cannot make exemption rules between sub interfaces for security reasons.

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Cisco Firewall :: ASA 5505 8.4(2) Allow User To Access Internal Www Server?

Aug 2, 2011

I tried the solution posted at [URL] however it did not work on my ASA5505 8.4(2). I thought that it may be because I only have a single public address so the web server is responding to port forwarding through the one public IP already. looking in ASDM it appears to indicate that a configured access list is blocking the server from responding to the internal hosts.
object network Private_IP
object network Public_IP
object-group network internal_net

Can I fix an access list (or something) to make this work or am I wishing for too much with only one public IP? This worked by default on my Netgear firewall.

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Cisco Firewall :: Anyconnect ASA 2.5 Cannot Access Internal Network Or Internet

Aug 1, 2012

After connecting via anyconnect client 2.5, I cannot access my internal network or internet. My Host is getting ip address of & gw:
Following is the config
ASA Version 8.2(5)

name EOCVLAN198 description EOC VLAN 198
interface Ethernet0/0
description to EOCATT7200-G0/2
switchport access vlan 2


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Cisco Firewall :: 5520 Can't Access Internal Web Server From Outside Network

Aug 23, 2011

I am using ASA 5520 with 8.2.4 IOS. I'm new to ASA/Firewall. I need to do access webserver from outside network.From Laptop (, If I connect to url... it should open page from also need to ssh to webserver from laptop. If I ssh to from laptop, it should connect to 10. 10. 10.50. [code]I can't get to webserver from outside network, so now, I connected laptop to directly ASA 5520 outside port with crossover cable.ASA Inside port connects to L3 switch. Webserver also connects to L3 switch. But still doesn't work.

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Cisco Firewall :: ASA5505 With Base License - Access From Dmz To Internal

Dec 18, 2011

we have a cisco ASA5505 with base license and 3 interface configured. Internal DMZ Outside The DMZ is configured to allow the traffic pass to the outside interface only (base license allow only traffic to one interface) in order to let clients on this network to browse internet. On the outside interface there's a nat configuration that let the port 443 to be natted to an in internal server. Is it possible to let the clients in DMZ to access to the internal server on port 443 from the outside interface?

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Cisco WAN :: WRVS4400N - External Web Server Can't Connect To Internal SQL Database

Jul 4, 2011

I have a hosted web server that has a website on it that needs to connect back to a database within our internal network. We have a Cisco WRVS4400N Wireless Router with 2 VLANS. VLAN 1 goes to a Watchguard Firebox which is connected to our internal network. VLAN 2 goues to our classroom network.
Our database is on VLAN 1. I have opened port 1433 on the Watchguard to allow SQL traffic from our Web Server. I can telnet from my workstation on VLAN 1 to the Web Server over port 1433, so I know the Web Server is not blocking anything. When I try to telnet from the Web Server to our Public IP address over port 1433, it fails.
I believe I have the firewall on the Cisco WRVS4400N off, so it shouldn't be blocking any traffic, but for the life of me I can't get this to work. I have been working on this for two days, and I NEED it to work. This was working up until last week, then it quit working. I am the only person making changes to our network, and there were no changes made during that time.

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Cisco Switching/Routing :: ASA5505 / Route External IP To Internal IP

Mar 20, 2013

I have an internal DVR system that I am trying to share to the outside world.  We recently put in an ASA5505 and I am having trouble getting the settings correct.I want to use an external IP to access the DVR system from anywhere and have my ASA5505 redirect the traffic to the internal IP address.  I assume I need to use a NAT and a route policy however can not figure out how it would be. 

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Cisco Wireless :: 5508 Office Extend Internal External?

Dec 18, 2011

I am having an issue with internal and external clients. When we have the nat ip configured on the controller we cannot connect internal ap's at all. When we take the nat ip out it works fine. We are on code 7.0.220. I have tried the following command  <config network ap-discovery nat-ip-only disable> and it did nothing.

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Cisco VPN :: ASA 5520 - VPN Clients And DNS Resolution Internal Or External Does Not Work

Jun 27, 2011

I have set up a remote access ipsec vpn on an asa 5520.  I can connect,  and ping internal ip addresses, however I cannot ping back out to the  internet, nor can the internal network ping the vpn clients and dns resolution internal or external does not work.  I am seeing nothing blocked in the logs on the asa.

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Cisco Firewall :: ASA 5510 - Enable External Access To Server On DMZ

Apr 5, 2011

i'' ve one appliance ASA 5510, v8.X and asdm 6X here u have my configuration :
interface Ethernet0/0 description Link To WAN nameif outside security-level 0 ip address!interface Ethernet0/1 description Link to LAN(forefront) nameif inside security-level 100 ip address!interface Ethernet0/2 description Link to CoreSW (DMZ) nameif DMZ security-level 50 ip address
i have on server ssh ( on my DMZ .
I wan to enable my external user, i mean outside user to be able to access to this server which is in my DMZ for this port ( ssh)

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