Cisco Firewall :: ASA 5520 / 8.6 Allow Publishing To Only One Range Of Public IP
Apr 19, 2013
Any confirmation that the versions 8.6 and up don't allow publishing to more then one public range if IP addresses?
We have ASA5520 version 8.4 in deployment and there I can NAT to 3 different ranges of public IP-s.
With same configuration on ASA5525-X version 8.6 it will NAT only the range that the outside interface belongs to. Also tried the 9.0 version with the same result.
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Jul 9, 2012
I have a Cisco ASA 5520 (Ver 8.2(4)) with all four interfaces in use (Public, Private, DMZ, Local offices) and an IPS module, so there are no spare interfaces. I have used all of Public IP's on the current interface for various services (these need one to one mapping, so I can't port map mainly due to SSL certificate issues) and I need to add another Public IP range. The secondary option on ASA interfaces does not exist as on routers/switches and I need to use an additional non contiguous IP address range for additional services advertised on the Public interface that are NAT'd to be servers in my DMZ.
I have seen an example of adding a static arp on the Private interface to allow a secondary gateway to be used for outbound traffic, but I need to allow 14 new IP addresses to be NAT'd from the Public to DMZ and possibly also for outbound NAT'ing (from either Private or DMZ to the Public). I have a L2 switch between the ISP router and the firewall, so using VLAN's is not an option unless the ISP can be persuaded (highly unlikey) to add the seondary IP's as a sub interface with tagging. Anyway if this was actioned then we would have a massive outage on our current IP range during the transistion.
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Jul 10, 2011
i have an ASA 5520 8.4(1) setup as follows
public wan
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ASA-- public dmz
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private lan
i need to allow https traffic to a server in the DMZ that will have a routable IP address will just an ACL suffice ?which interface do i apply it to ? wan or dmz ?i dont need a NAT since the DMZ is a routable space?
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Apr 28, 2013
I have ASA 5520 with Ver 8.2.Outside interface is directly connected to ISP's router(TelePacific) and is assigned one of public IP:198.24.210.226.There are two servers inside the network with the private IP's:192.168.1.20 for DB Server, and 192.168.1.91 for Web Server.I did Static NAT 198.24.210.226 to 192.168.1.20 and 198.24.210.227 to 192.168.1.91.When I access DB Server(198.24.210.226) it's working OK but when I access Web Server(198.24.210.227) there is no response at all.I checked the inside traffic, it even did not get into the firewall.Is this the problem with ISP's router? How can we route all of our public IP's to the outside interface(198.24.210.226)?
interface GigabitEthernet0/1nameif insideip address 192.168.1.1 255.255.255.0security-level 100no shutdown
interface GigabitEthernet0/0nameif outsideip address 198.24.210.226
[Code].....
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Oct 16, 2012
I have ASA 5520 with Version 8.2(5), the ISP give me a block of IP pubic (201.148.156.193/28), one IP valid (201.148.156.194) have the Global NAT (all users LAN) and server FTP, but i need that IP 201.148.156.195 is used for VCSe, and the IP 201.148.156.196 is used for other server FTP.
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Nov 8, 2011
How to setup this Nat on an ASA 5520 running 8.3.2 code? I know this must be possible as I can do the same thing on my Check Point with no issues. I need to Nat two dmz mail servers to one public mx record. I will have an F5 to load balance inbound and outbound traffic from the mail servers. So I need to Nat two private IP’s to one public.
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Jun 11, 2013
We have 2 x ASA 5520s in active/standby and we have a block of 30 public IP's that NAT to many servers etc and we use it for our Corp VPN. We are changing ISPs soon and we will be getting a new block of public IPs where do I even start to plan the migration and how? Can I overlap somehow and do a slow migration or must I do it in one big swoop?
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Nov 8, 2011
I am having to NAT an IP range on our ASA 5520 as a remote VPN has the same IP range. The NAT is done, but for the source access list on our ASA do I need to use our natted IP range or the non-natted IP range?
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Jun 22, 2011
How can we host 300+ secure (https) websites using a couple of public IP's on an ASA5520 with AIP SSM-20 and with as few certificates as possible?
Summary of set-up:
We currently host a number of websites using an ASA5520 and use host headers, so have 6 servers with around 40 hosted URL's. The number of websites is due to double very soon and we will need to use more of our public IP's. We can see that we will will run out of public IP's very soon especially as there is a project in the pipeline that has a likely requirement to host an additional 200+ websites.
Each of these websites are required to use https and therefore each must have a certificate which will be very expensive. PCI DSS (payment card industry data security standard) is causing us issues because we had hoped to post the certificates on the firewall (one for each physical server) and then run the data UN-encrypted from the firewall to the relevant web servers, so that we could use one certificate for lots of websites and therefore reduce our certificate costs, however is not best practice to do this due to the data being unencrypted within the firewall and on the DMZ network and therefore potentially open to compromise. I doubt that we could install 200+ certificates on a 5520 and then re-encrypt the data to the web servers especially seeing as we also have an IPS card that is already running at around 70-80% util due to the performance overhead.
BTW - We also have an in-line Breach WAF which will be required to inspect the packets (certificates to be installed on the WAF to allow this).
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Mar 17, 2011
Got an ASA5520 running V8.2(3) and we want to upgrade our internet bandwidth. Our ISP says OK but we need to install different physical circuit, upgrade CPE router, etc.
Then they say, btw your globally allocated IPs will change - this is a problem as we have Site-to-Site VPN Tunnels, IPSEC RA, etc.
ISP are proposing to give us a 3 month period whereby old & new IP blocks will be routed to our ASA (by means of secondary IP address on their Cisco CPE).
Multiple IPs on the same physical i/f on the ASA require sub-interfaces/IP Addresses/VLAN ids on my "outside" i/f.
Is this going to horiibly break Site-to-Site VPN Tunnesl, IPSEC remote access ?
Will VLANs work at all with IPSEC on the "oustide" i/f at all ?
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Oct 25, 2011
I'm migrating our network objects from our current firewall to a new ASA 5520 configuration. I'm using ASDM 6.4 for configuration.
We have a range of IP addresses for hosts that we need to add to a firewall rule/ACL. In the previous FW software I could create an object that was a range of IP address. For example there is an object called emailservers that is defined as 192.168.2.25-192.168.2.50.
Is there a way to do a similar thing on the ASA 5520?
I can see how to create subnets, but in this case I only have a range of IP addresses, no subnet mask.
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Apr 7, 2013
Does the ASA treat an object-group with a network-object containing a range of IP addresses as a netmask? For example, I can apply this configuration without the ASA throwing any errors though the configuration calls for a 'net mask':
object-group network test
network-object 192.168.0.0 192.168.63.255
?
network-object-group mode commands/options:
A.B.C.D Enter an IPv4 network mask
sh run ob id test
object-group network test
network-object 192.168.0.0 192.168.63.255
I found that in the documentation it requires a netmask as oppose to a range. Is this a bug in the code? I am running code version 8.0(5)23 on a 5520. If this is not a bug how does the ASA treat this type of configuration when applied to an access list? When I ran a quick packet trace and denied access from that range it looks like the ASA doesn't read that configuration properly.
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Sep 27, 2012
I understand router on a stick for inter-vlan routing but where I'm having trouble is having one of the vlans be public addresses. One of my clients has a rack in a colo where there is no router, i.e. their /24 public network has .1 of the network assigned to a colo router, then they have a 2960G switch in the rack that all the gear is connected to. Public IP's are assigned to certain devices / servers with .1 as their GW. Problem is, they also have a private range on the same switch with no vlans and things are a little 'cluttered' and there is no control of traffic.
The assets I have are a 2821 router with (2) GigE interfaces and the 2960G switch. A /30 network is going to assigned on the colo gear to use to push the entire /24 down to the cabinet. I'm going to NAT the local 10.100.x addresses on vlan 10 and I want the public traffic on vlan 20. During a recent test, the private traffic worked as expected but the public traffic didn't work. I don't need a complete config, more of a 10,000 ft. view of how this needs to be done so (a) traffic is vlan'd to keep things segmented, (b) I can static inside / outside public addresses from the /24 to reduce the number of public addresses being assigned directly to servers (some of this is unavoidable, but the less the better), and (c) I can NAT the local subnet to either to the /24 or the /30 (not much very much traffic in this way).
EDIT: The switch is a C2960S, not G. I cannot enable lanbase-routing, it is apparently unavailable.
* 1 26 WS-C2960S-24TS-S 12.2(55)SE3 C2960S-UNIVERSALK9-M
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Jan 15, 2012
I work at a Public Safety building in Pennsylvania and our employees here share a Wifi connection with a local hospital facility that is in a industrial park behind us. The room we work in is able to access the Public Wifi but only half of the room has a good connection. I went to the local computer store and purchased a Belkin Dual-band wireless Range Extender and got it all set up, now I have the Public Wifi Extention access and it will connect to it but it has no internet access. Now we have no access to the administor or the network from our facility. How do i get internet access thru this range extender? If i connect from the good half of the room to the Public wifi i have a good connection with internet access but as soon as you put it thru the extender no more internet access.
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Nov 6, 2012
I am trying to configure a SSL VPN on a Cisco ASA5520. Unfortunately the port 443 of the OUTSIDE interface of ASA is already in use by Microsoft Outlook Web Access and I cannot change the configuration of Outlook. This configuration already in place prevents me to use the public IP of the ASA as Cisco VPN ip address for the webpage. I don't either want to use a different port so to keep life easy for the users.I have some public IPs available that I can use so I wanted to use one of them instead of the ASA's OUTSIDE interface.
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Mar 5, 2012
We have a Cisco ASA 5520, and we're creating an IPSec VPN to another Cisco ASA. We have multiple VPNs on this firewall.
The issue with the latest one is they require a Public IP as the Local Encryption Network. I've seen this question a couple times while searching but never really a definitive answer.
Would using the "Outside-Network" as the local encryption network, then natting the appropriate IPs be sufficient? Or would this not work at all?
Our Public block is X1.X1.X1.64 - X1.X1.X1.79, our Peer IP X1.X1.X1.66. Would using X1.X1.X1.64/28 as the local encryption network make the connection? Then NAT the needed IPs from our DMZ X2.X2.X2.71 as X1.X1.X1.71 to the client?
Would this work or am I way off the mark (I'm by no means an ASA expert, and an ASDM explanation would work over command line).
Edit: Or would I have to create a new Global Pool made up of Public IPs on a different subnet mask than our actual Public IP address pool. And make that our Local Encrypted Network? I think this might be it, but could it cause IP overlapping? Our webserver is part of this and I'm worried about causing connection issues.
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Feb 12, 2013
I need config mi own Cisco Router 2600 and permit to External Internet my Samsung DVR SDE-4001
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Nov 23, 2012
My laptop is inspiron 5520 new one just one month old ?I have similar problem like that ( my wireless is working but in very closed distance to the connection point, if I change the site to about 5 or 6 metter from the connection site, the Internet become interrupted,
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Apr 3, 2012
We are going to "publish"(I don't know if this is correct word to use;)) our mail server on Cisco 2921. As far as I know it can be easily achieved with static NAT. But the thing is, we don't want to publish it on standard 443 port i.e. we want router to listen for https connections on other port than 443, and then redirect this connection to internal server with private ip.
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Nov 15, 2011
I've just registered with NO-IP (free account), created a host, installed the client (in CentOS) and I want to see a website I'm running locally in that computer from another computer (via internet :). How do I access it?My host is "customtrack.no-ip.org "And in that unix box I've got a published website that I can access from any browser in the following URL: [URL]When I log in to from the browser from another computer I get the following error message:
Quote:The connection was reset- The connection to the server was reset while the page was loading.The site could be temporarily unavailable or too busy. Try again in a few moments.If you are unable to load any pages, check your computer's network connection.If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the Web.
How do I tell CentOS that I want to redirect that site I'm hosting locally [URL] to [URL]? I believe that's not done automatically. How do I configure the redirection?
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Jan 21, 2013
We have a network of over 20 devices, all kinds (windows, android, mac enz...). Everything was going well until one of the mac-users tried to publish his website that contained a movie (at first the movie was 622 MB). If this user presses publish the internet is going away. The website won't publish, waiting doesn't work. While the internet isn't working I went to another pc in the network and started some ping experiments. I can ping any device in the LAN, outside the LAN something strange happens: let's say for 6 seconds it is ok, but then it fails for lets say 20sec, again 6 sec the ping returns ok (45ms), and goes down for a longer period. Eventually it is not coming back.The mac user himself cannot access the internet either. When the publishing is stopped, the internet is back in less than a second.
This problem is recent, and it isn't the first time this user published a video on his own website, on the same host with the same application (iWeb). I asked him to publish his site to a local folder and hand it over to me, I tried to publish it to the same host using my own FTP application (FileZilla), this worked without any problem (I am on the same network). This is what we tried:
- Compressing the video (it is now 26 MB, still not working), we have 2GB space from the host, no limits on filesize.
- Publishing the website without the video's, no problem
- I turned on logging (debugging level) in the modem/router, no entries at the moment things went wrong...
- I called the provider, they claim nothing is wrong at their systems.
So, can the modem be broken? I don't think so because I can use it with far more intensive tasks without going down.One thing is clear, it shouldn't be possible for one computer to block the internet for everybody, so changes in the configuration are needed (I think).
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Nov 21, 2012
New to the ASA 5505 8.4 software version, but here is what I'm trying to do:
-Single static public IP: 16.2.3.4
-Need to PAT several ports to three separate servers behind firewall
-One server houses email, pptp server, ftp server and web services: 10.1.20.91
-One server houses drac management (port 445): 10.1.20.92
-One server is the IP phone server using a range of ports: 10.1.20.156
Basically, need to PAT the ports associated with each server to the respective servers behind the ASA 5505. Is anything missing from this config? Do I need to include a global policy for PPTP and SMTP? [code]
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Nov 2, 2012
We were using ASA-5520-K9 with ASA-SSM-AIP-20-K9 but recently found some hardware problem in our running ASA. Now cisco want to replace with ASA-5520-K8.
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May 13, 2011
1. how do I nat a public address to a dmz address.
2. how do I open port 80/443 in the public to this address?
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Mar 16, 2011
we have hosted voip and would like have our internet as back for their router. We gave them public static ip so they can configure that in their router. How can i configure the ip address in our firewall let say on asa5510 ethernet port 3 so if their router T1 goes out then our internet will work as backup.
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Jul 22, 2012
I am now using ASA 5510 as a firewall device.I have configured 3 interfaces ethernet 0/0,ethernet 0/1,ethernet 0/2 as Wan interface, DMZ interface and Internal Lan interface. Internet is working fine from LAN as well as DMZ.The WAN interface use the Public Point 2 point IP(/30) Provided by the ISP and another pool of Public Ip is also provided by the ISP (/28). Now I want to Map the /28 IP to some servers in DMZ . DMZ servers currently have 192.168.101.0/27 private IP . Now the problem is how to Map the Public IP to those Private IP in DMZ servers.
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Jan 16, 2013
We have 2 IP blocks from my ISP. We have been using just one a /30 block with one IP address used on the outside interface of the device. The new block is a /29 range and I would need to use just two of those IP addresses. Here is the situation I am facing.A company we partnered with wants to set up a VPN, they will send us 2 Cisco 861s to put behind our ASA. Is it possible to assign these 861's with public IPs from the block that we are not currently using? (the /29 range)? I know that it might require an upgrade to the Security Plus.
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Oct 7, 2012
I am having normal network need to add public ip 162.196.212.32 / 29 with port 51241 in ASA firewall
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May 2, 2013
The client I am doing work for as ASA 5505 at a remote location that is using Cox Communications for the ISP. The ISP assigned 5 static IP addresses, but we only need 1 for this location. However, that is the minimum you get no matter what. The issue is that the subnet mask is a /25 and what they are telling me is that the ASA is grabbing all the IP addresses in that range. They asked if there is anyway to keep the ASA from grabbing those IP addresses. Now, I have never run into this issue before with a provider. The gateway is in the /25 subnet, so going to a /30 isn't an option.
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Aug 31, 2011
i just got an extra public subnet from our ISP (co hosting center) But I can't figure out how to use them on my ASA.
New:
IP-adresses: 87.1.1.194 - 87.1.1.254
Default gateway: 87.1.1.193
Subnetmask: 255.255.255.192
Old:
IP-adresses: 200.1.1.34 - 200.1.1.46
Default gateway: 200.1.1.33
Subnetmask: 255.255.255.240
Config:
route wan 0.0.0.0 0.0.0.0 200.1.1.33 1
And statics like:
static (interface,wan) tcp 200.1.1.37 3389 192.168.3.100 3389 netmask 255.255.255.255
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Nov 8, 2011
in ASA 8.4, I need to use to static nat an internal IP with a public IP and use the same public IP to dynamic nat another internal IP:
-nat (inside,outside) source static IP1_PRIVATE IP_PUBLIC
-nat (inside,outside) source dynamic IP2_PRIVATE IP_PUBLIC
All outgoing connection from IP1_PRIVATE and IP2_PRIVATE should be natted to IP_PUBLIC and all incoming connection to IP_PUBLIC should be forwarded to IP1_PRIVATE: is it correct ?
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Sep 5, 2012
We have the setup as shown above, our requirement is to access mail server via ports smtp and pop3.But as the mailserver is hosted at internet users at site were not able to aceess. we need to nat a intranet ip with mail server ip and mail server ip back to intranet ip and provide the access.We use ASA 5510 firewall.
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Jun 8, 2011
Upgrading from a PIX 515 ,V6.2, I can get internet traffic out through the ASA , but no traffic in to the servers. The NATS are the same on the old firewall. The routers outside the firewalls are doing further natting from the .253 netwrok to a publilc address. No changes have taken place on the routers. [code]
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