Cisco Firewall :: 5520 - Multiple Global IP Address Range On ASA Outside I/f
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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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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Oct 24, 2012
We're currently PATing everything from a particular subnet to the IP of an outside interface using our ASA5585 (dynamic PAT). We're experiencing pool exhaustion and therefore need to expand the global IP range. Any way of cutting over to the new range without dropping existing connections? For clarity, the current interface address is x.x.x.37/22 and the new PAT pool is x.x.x.114-6/22.
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Nov 30, 2011
I have an ASA 5510 running version 7.0. I have a problem with an exchange server using a static map and its outbounc connectivity. It connects outbound through the global address even though inbound connectivity works fine through the static mapping. The recent changes are changing of the zero route through a different interface (there are to circuit connected to this ASA on different interfaces). So the idea was to get all workstations in the office using the global address and routing out through one circuit, and the servers connecting in/out through the other circuit. Shouldn't a static mapping ignore what the zero route is?
Here are what I believe to be the relevant configs.
interface Ethernet0/0
description New 6mb circuit
speed 100
[Code]....
So exchang2 server can be connected to from the outside properly via IP xxx.207.51.231/exchange2-outside, but all outbound connections from this server are going out via IP xxx.122.47.218/circuit-6mb as do all the workstations due to the global address statement.
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Apr 26, 2011
nat global entry not showing up in ASDM but it does via CLI see blow, it's a policy NAT.
nat (inside) 5 access-list inside_nat_outbound_4
global (outside) 5 ************-OUTSIDE netmask 255.0.0.0
Global 5 doesnt show in ASDM 6.1 (5) the globals only go up to 3
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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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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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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 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 11, 2012
Currently in our environment we have have two buildings with an ASA 5520 in each and a core stack of 3750's in each building. I am currently working on a network segmentation project and am thinking of adding another stack of 3750's in each building to add more redundancy to our network. This will allow our access layer switches to have a trunk to each stack and prevent an outage if one of the links or stacks were to go down.
My question is how I would set this up on the ASA end of things while using a common subnet and HSRP on the 3750's. I understand how to use HSRP and STP on the switches to achieve this on the 3750 end of things. I saw you can do etherchannel on the ASA with 8.4 but how does that work in a failover situation?
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Apr 4, 2011
I've got a cisco asa 5520 and setting up the NAT for multiple DMZs on it.
I want to use PAT on the outside interface.
internally ive created subinterfaces for the VLANs and connected to a trunk port on a switch.
configure NAT for this scenario. I've got only 1 external public IP address.
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Mar 8, 2013
I need to configure multiple context mode with active/standby failover solution.
Even after reading some Cisco documents I still can't understand if active/standby failover configuration has to be done within the admin context only or also within every single context (context-1, context-2 for example). In this case I have to allocate as failover interface a subinterface for each context (admin, context-1, context-2), right ?
Therefore a I have an other question: within the admin context, in a failover solution, do I have to allocate all interfaces I want to be moniotred, even though some will be used by context-1 only context and some others will be used by context-2 only context ?
An other question is: if active/standby failover configuration has to be done within each context, can I set regular failover within context-1 while stateful failover within context-2 ?
The last question is: can I use management interface within all 3 contexts ?
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Feb 2, 2013
I was wondering how to tighten the security of my email delivery to a range of ip addresses (I know how on my old firewall but the cisco is quite a bit different). Right now anyone sending email to a particular ip address on my firewall can do so. I want to restrict that to two ip address ranges it will accept deliver from. I'm thinking I need two network objects for the two ranges then add to a network object group. Configuring the ACL for delivery using that group if I'm correct about that ?
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Apr 13, 2011
ISP assigned us the following:xxx.yyy.zzz.32/30 as the outside interface network.This means .33 is the next hop, gateway, or default route.This means .34 is the outside interface on the ASA.xxx.yyy.zzz.64/26 as the ip address pool.This means xxx.yyy.zzz.65 to xxx.yyy.zzz.127 is the address pool.xxx.yyy.zzz is identical in all cases.Addresses .35 through .63 are owned by other parties and are not usable to us.The 33-34 setup works using static routing - IPSEC VPN is setup and functioning properly using these addresses.
[ie. Route outside 0.0.0.0 0.0.0.0 xxx.yyy.zzz.33]
After NAT and ACL entries are created to provide altnernate external IP address on the outside interface [ie. static (inside,outside) [external ip] [name] netmask 255.255.255.255 and access-list [name2] extended permit tcp any host [alternate outside ip] eq https], attempting to browse to an internally hosted website from an external IP address results in the following messages in the ASDM log.
6 Apr 14 2011 17:58:51 110003 [redacted external IP Address] 37763 [Internal Website Name] 80 Routing failed to locate next hop for TCP from Outside:[redacted external IP Address]/37763 to Inside:[Internal Website Name]/80
How do I setup routing for this non contiguous address range?
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May 6, 2013
I have an ASA5505 with 8.4 software used on a business DSL account.This means I am running PPPoE session to the provider and am then given an Inside Global subnet /29.I have various servers NATed to specific IP's then have the DHCP users NAT with overload to another of my inside global addresses. When I try to establish an IPSEC tunnel to any of my inside globals and monitor I get an access denied message but there is nothing that is blocking.If I determine my PPPoE IP address I am able to extablish a IPSEC session to that but cannot exchange traffic. Not that I want to use that IP anyway because that PPPoE Session IP changes and only my inside globals are static.I spent several hours on this and cannot put my finger on it. Do I need to allow VPN to the INSIDE interface?
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Dec 4, 2012
I used to have a Thomson st-330 USB modem for my ADSL network. When I wanted to change my IP i just disconnected and reconnected a dial up connection that does the job instantly! (a wan miniport + a batch file to disconnect/recoannect with my password and username)Few days ago i bought a new modem/router (TP-LINK TS-W8951NS)Before that all I knew was that if I wanna change the ip address (if I have a router) was a batch file with commands ipconfig /release/renew.I now know that this changes the ip of my PC not the global IP! So how would I change it without restarting the router? (When i change something in my router interface page (PVC1.2.3....etc) my IP changed instantlybut how do I do this without accessing the router, like commands and a batch file etc? I just found out that my global IP changed on its own after like 30-60 min :S why is that! and to do so manually???
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Jul 25, 2008
CAn we filter MAC address in LAN using ASA 5520 , whats the method ?
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Oct 7, 2012
We recently replaced our Cisco 5510 with a 5520. I had the SSL Client VPN working on the 5510, I cannot get it working on the 5520. The IOS version is 8.2(5) and the ASDM version is 6.4.I run through the SSL Client wizard and get everything set up. When I try to get to my outside interface Internet Explorer just comes up with an error. When I try to connect through the Cisco AnyConnect client on my Android it used to come up with a "No address available for SVC connection". After deleting an address pool not even related to my SSL VPN profile I cannot get that far. I just get a "login failed". Even after I create a user with level 15 privilege and assign to my vpn group policy.I still get the "No address available for SVC connection" when I try to connect to the default profile, which doesn't really go anywhere.
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Apr 30, 2013
I am trying to get two external addresses to PAT to different ports on the same address in the dmz.
Object NAT is configured as follows:
object network Obj-192.168.1.20-1
nat (dmz,outside) static Obj-External-1 service tcp https https
object network Onj-192.168.1.20-2
nat (dmz,outside) static Obj-External-2 service tcp 2000 https
Obj-192.168.1.20-1 and Obj-192.168.1.20-2 contain the same host address.
The idea being that traffic destined for Obj-External-1 on port 443 will be forwarded to Obj-192.168.1.20-1 on port 443. Traffic for Obj-External-2 on port 443 will be forwarded to Obj-192.168.20-2 on port 2000.
Traffic for the first object, Obj-192.168.1.20-1, works but traffic for the second does not.
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May 28, 2012
We have a Cisco ASA 5520 and in order to conserve public IP addresses and configuration (possibly) can we use the same public IP address for a static NAT with two different interfaces? Here is an example of what I'm refering too where 10.10.10.10 would be the same public IP address.
-static (inside,Outside) 10.10.10.10 access-list inside_nat_static_1
-static (production,Outside) 10.10.10.10 access-list production_nat_static_1
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Oct 31, 2011
I am trying to correctly configure our ASA 5520 and our Mitel Border Gateway in our DMZ. In the documentation for the Mitel border gateway it wants me to set up 2 external IP's on my ASA one to allow 443 traffice into the MBG, and another for 443 traffic that needs to be forwarded to port 4443 for the MGB in the DMZ. My problem is I don't know how to do this. the MBG only has one IP, and I need to have 2 different URL's mapped to two different external IP's both externally using port 443, and one of them forwarding to 4443 on the DMZ interface.
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Apr 6, 2011
I have a handheld device that will be used for inventory outside of our office. It has 3g capabilities. Is there anyway I can permit traffic from this device from the outside world coming into my network? I need to open a couple of ports so it can hit the server. But I have no intention to open these ports up to the entire world. I use an ASA 5520 with a managed router from our provider. I looked around on the Cisco site and the only information I found was for permitting and denying traffic from devices that are within the network.
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Dec 13, 2012
I am trying to connect two overlaping IP address sites ( see attached diagram). Site A LAN address will dynamic NAT to 10.1.1.0/24 at ASA5520.All the users from site A need to get services from site B ( DHCP, DNS, Mailbox,Print Servers, AD loggin etc). All the connections will be initiating from site A to B.
1-will all these services will run over NATed address.( dynamic) or I have to change to static NAT?
2- Any sample config for ASA 5520 for this type of network?
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Jun 7, 2012
I am having issues getting this to work. For email, I have mail.xxx.xxx DNS'd to 165.165.165.165. I want it to come in to 10.1.0.31. It needs to go out a cluster of 10.1.0.31, 10.1.0.34, or 10.101.201.31 but look like it came from the 165.165.165.165 address. I have set up static NAT for the inbound. I have set up the global PAT with an ACL group of the 10.xxx addresses. I have set this same method up on an ASA with no issues but it doesn't want to work on the PIX 6.3. What am I missing?
no fixup protocol smtp 25
object-group service NewExchange tcp
port-object eq https
port-object eq smtp
[Code] ....
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Oct 3, 2012
I have a Cisco ASA running 8.2 in routed mode.The ASA has three interfaces, inside, outside and DMZ. They connect to the following three networks:
Inside: 10.1.1.0/24
Outside: 10.1.2.0/24
DMZ: 100.1.1.0/24
I have the following dynamic PAT configuration:
nat (inside) 1 10.1.1.0 255.255.255.0
global (outside) 100.1.1.1
nat control is turned off.
By my understanding any traffic from the inside to outside interface will be PATted to 100.1.1.1. However, communications between inside and the DMZ will not be PATted, and should work with no problems.This seems to be corroborated by this document: [URL]Which states:"The adaptive security appliance translates an address when a NAT rule matches the traffic. If no NAT rule matches, processing for the packet continues."EDIT: I may have misunderstood the above statement.I found this guide to configuring NAT/PAT: [URL]It states:"When you specify a group of IP address(es) in a nat command, then you must perform NAT on that group of addresses when they access any lower or same security level interface; you must apply a global command with the same NAT ID on each interface, or use a static command. NAT is not required for that group when it accesses a higher security interface because to perform NAT from outside to inside you must create a separate nat command using the outside keyword. If you do apply outside NAT, then the NAT requirements preceding come into effect for that group of addresses when they access all higher security interfaces. Traffic identified by a static command is not affected."My problem is that packet tracer does not seem to bear me out. It tells me the packet is dropped due to "no matching global" when I source traffic from the inside interface and send it to the DMZ.
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Nov 24, 2011
I got a Global Implicit Rule problem with my Cisco ASA 5510. Here's my configuration : url...I created a PAT translation so that my web server (group LAN Network) could be accessed from the Internet.Although every rule seems to be ok, i got a "tcp deny access" when i try to telnet my public IP on port 80 (ping is ok).
Why is there only one Global Implicit Rule, and not one for each Interface (like in the older versions of ASA OS) ?
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Sep 26, 2011
I have ASA 5550, i create 2 context in my ASA 5550. I create a NAT in context A and context B. But when i create NAT in context B i get another i get error message like this "static overlaps with global in another context". I have checked there is same nat translation in context A and context B. My question is : is same nat translation configuration not allowed in context A and context B"
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Jun 2, 2013
I'm receiving an error when trying to access a web server behind from one subinterface to another subinterface on an ASA access the public IP. I'm getting the following:
Global Static NAT Deny IP spoof from (61.X.X.X) to 201.X.X.X on interface Outside
Traffic dies at the firewall stating that the traffic is spoofed from the Global address (61.) to the static (201.) address. Both bound to the outside interface. When I create a static NAT on the firewall there is no problem; however when I'm patting against the firewall to the public IP I get the denies.
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Jan 23, 2012
Verifying the operation of the ASA when configured with Global access rules. Does the global rule overide the interface security levels? According to the ASA order of operations, the interface specific rule get's processed first and then the global rules, but It does not say anything about interface security levels. Observing an ASA in production that has global rules configured I see that an interface with a security level of 50 that has no rules applied to it, passing traffic to the outside interface (security level 0) drops the traffic. Syslog shows that it hits the global access rule implicit deny. Does the implicit permit any to any less secure interface not apply?
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May 22, 2013
I am struggling to get our 887VA setup for our config.
We have a public IP range from our ISP and we have multiple servers behind our router. One of the servers need large ranges of ports open so I have ended up trying to use a ‘rotary’ nat pool which works fine but I cannot get the other servers to NAT correctly on their ports. It seems the rotary takes over.
Here is a snip of my config.
interface Ethernet0no ip addressshutdown!interface ATM0no ip addressno atm ilmi-keepalive!interface ATM0.1 point-to-pointpvc 0/38 encapsulation aal5mux ppp dialer dialer pool-member 1!!interface FastEthernet0description Private LANno ip
[Code].....
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Dec 20, 2012
Although I haven't looked through all the forum topics I couldn't find anything very similar to my situation. I have a rather large house and my modem/router (Netgear DGND3300 v2 due to DSL) is in the very corner. Given this most of the opposite corner of my house gets either poor or no connection; however, I do have an ethernet cable run across the house through the basement to my home theatre setup. This is where I encounter another problem, I need multiple devices to be connected via ethernet and I also need to have wireless in that same area. In my mind I picture myself connecting a second router to this ethernet cable through which I could have wired connections to all my devices, and a second router broadcasting wirelessly. I'm familiar with some types of wireless bridging, but I'd rather use more of a wired bridge concept if possible, but I've never really seen something like this. The question is, is this possible? Or, what is another possible way to achieve the same results? The only other thing I can think of is to run an ethernet hub from the original wired connection to my home theatre so I can connect multiple ethernet devices and run a separate wireless extender or something, but this just seems pricy.
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