Cisco Firewall :: ASA 5510 - NAT With 2 ISPs / 2 Different Public IP?
Oct 17, 2011
We have an issue with some NAT on an ASA 5510. Here is a simplified drawing of the ASA setup:So the issue is when we try to send traffic from 172.16.3.251 to 1.1.1.1 we got this message in the log:
Oct 18 2011 12:32:12: %ASA-3-305006: portmap translation creation failed for udp src inside
172.16.3.251 /37166 dst outside:1.1.1.1/23
It looks like there is an issue with NAT but maybe is cause of the DUAL ISP setup as packets are routed through the outside interface and not IPtelefoni_outisde?
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Oct 30, 2011
Currently we have a T1 for data connected to a 1721 Router that is connected to an ASA 5510. We would like to add a FIOS line for dedicated online backup. Is it possible to connect the FIOS router to the ASA and route the IP from our backup server to use the FIOS line and everyone else continue to use the T1?
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Jan 5, 2013
I have ASA5510 with PLUSE License.I have 2 Inside interfaces as STAFF and MAIL and two Outside interface OUT_STAFF and OUT_MAIL which is in separate ISP's.now i want to nat STAFF to OUT_STAFF and MAIL to OUT_MAILbecause I'm having two default routes it gets impossible to do.
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Aug 25, 2011
What we are trying to accomplish here use two ISP's (one cable and one T1), use the Cable line for site-to-site VPN and use T1 line for all internet traffic. We currently use the following configuration: Cisco 2820 routers terminating the T1 -> HP switch -> Cisco AS 5510 port 0 -> port 1 to LAN switch (Nortel 5510)We want to force all VPN traffic (using 10.0.0.0/24 subnets - 10.0.1.0, 10.0.2.0, etc) through a cable connection, perhaps on port 2 of the ASA, then all non VPN traffic goes to the T1.
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Apr 11, 2013
I am in the process of configuring a ASA 5510 to replace an older PIX. This change is part of migrating to a new ISP, so the process is complicated by the existence of two outside interfaces. I have virtually everything working, but there is a requirement to be able to access hosts from the internal networks using both their private IPs and their public IPs. The older PIX took care of this silently with little configuration, but the ASA has me twisted on the details. Some of the hosts with public IPs are on the internal network and some are on a DMZ (not my design, inherited). For the internal ones I implemented hairpinning to take care of the requirement, but I am having trouble with the DMZ based hosts.. Since there are two external interfaces each internal host has two IPs and two static NAT rules to handle incoming traffic from each external interface.
The routins and dynamic NAT entries we have in place take care of accessing the hosts using their private IPs on the DMZ, but I cannot figure out how to get the public IPs to work from the internal network. It seems like a simple Static D-Nat shoudl do it, but when I add a Static D-Nat on the DMZ the public IP works, but the private IP breaks.. Is there a way to get them both to operate ?
Network layout looks like this (IP ranges altered):
DMZ 172.10.0.0.0 Class C
INTERNAL 10.0.0.0 Class C
Outside 1.2.3.0 Class C
Outside2 2.3.4.0 Class C
[code]....
After applying it I could access the public IP (1.2.3.50) from the internal network, but I could no longer access the DMZ IP (172.10.0.2) from the internal network. Is there any way to get this configuration to allow access to both IPs from the internal network ?
The problem here is that there are website links based on the public IP and the DNS is split so DNS returns the internal IP to users. As a result both need to be accessible from the internal network.. Not my favorite design, but the client (or in this case the boss) is always right so I need to get it working somehow.
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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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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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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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Mar 3, 2013
I have DMZ n/w 192.166.0.0/24 on which i have nated on public ip
-private ip : 192.16.0.201 (OWA)
-public ip : 61.x.x.x.
when i try to access owa(public ip ) from dmz it is not allowing , From what rules i need to set to get work ASA 5510 8.2
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May 7, 2012
I have a new 5510 which I have upgraded to 8.4(3). I have a /29 subnet from the telco on my outside interface. I have 6 subinterfaces on a dot1Q trunk on my inside interface. The customer requirement is to have two servers in a DMZ which have public IP's from the /29 subnet. The customer will not give the servers a new IP address so we are stuck with the two public IPs in the DMZ. I thought I would need a bridge group and bridge the outside, two DMZ interfaces but I read that bridging requires the firewall to be in transparent mode and then it won't support VPNs - this is not an option as I need to terminate VPNs on the box too.
how can I accommodate the two servers in the DMZ with public IPs whilst the ASA is in routed mode ?
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Feb 19, 2013
Im having problems with google saying we generate to much traffic to [URL]
I need to know which machines on the inside are talking so much with google. Can this be done via ASA 5510? do i need a third party program for this?
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Feb 5, 2012
I have a situation where we have a single DMZ server currently statically forwarded to a single public IP. TCP ports 80, 443, 8080, 8500, 53, and 21 are open to this server via an access list.
However, we have added an additional server to the DMZ, and because our web developers did not communicate with me beforehand, we are forced to use the same DNS name (thus, the same piblic IP) for this server. This server only needs traffic on TCP/8800 forwarded to it.
I am using ASDM 6.4 for configuration of this, as I am required to take multiple screen shots of the procedure for our change control policy.
My question lies in the reconfiguration of NAT/ PAT. Since our current server has a single static NAT to a single public IP, it is simply natted for "any" port. I understand that I can add the new server as an object, and only PAT it on TCP 8800, but will I then have to go back and reconfigure the first server multiple times for PAT, or will the ASA notice the specific PAT, and forward 8800 to the new server without affecting the existing "old" server?
It appears ASDM will not allow me to put multiple ports into a single network object. I am assuming I will need to add 6 separate object translations for the "old" server based on TCP port, and 1 object translation for the "new" server, correct?
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Apr 13, 2013
I have a few devices that the manufacturer told us we have to set with a public IP (No Natting) We have Internet ->ASA5510-> Switch 3550 with 3 vlans. Up to now we have always use Natting to configure internet access to specific devices. I heard setting up a witch with one VLAN connected to the internet and all other internals is a bad idea. that was the only Idea we had.
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Sep 18, 2012
I've tried a bunch things but it didn't work, I'm about to gave up! :-/
I have the following scenario:
ASA5510 - v8.3(2)
Interfaces
ETH0/0 = outside = 189.xxx.xxx.129
ETH0/1 = inside = 10.xx.1.15
[Code]....
What should I do to get the SIP and 8080 port working on my Public IP, likewise just as access from my browse the http://189.xxx.xxx.129:8080 and get through directly to my internal server 10.xx.xx.61 ?
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Feb 5, 2012
We need to deploy a Cisco ASA 5510 behind the Internet facing router for Remote Access VPN (RAVPN). We bought the block of 16 IPs (in a different subnet) which is routed through the main router (69.x.x.x)and configured the outside interface of ASA with a public IP 64.x.x.x and subnet mask 255.255.255.240. Below is the network structure.
But, we can't access the ASA by it's public IP.
DSL Modem → RV082 router → Switch → LAN
(69.x.x.x) ↑ (192.168.0.0)
Cisco ASA 5510
(outside: 64.x.x.x, inside: 192.168.0.172)
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Dec 2, 2010
I'm currently replacing my ASA 5505 with a 5510. I have a range of public IP addresses, one has been assigned to the outside interface by the setup wizard (e.g. 123.123.123.124 ) and another I would like to NAT to an internal server (e.g 192.168.0.3 > 123.123.123.125). On my asa 5505 this seemed fairly straigh forward, i.e. create an incoming access rule that allowed SMTP to 123.123.123.125 and then create a static nat to translate 192.168.0.3 to 123.123.123.125. Since I've tried to do the same on the 5510 traffic is not passing through so I'm assuming that the use of additional public IP addresses is not handled in the same way as the 5505? I also see that by default on the 5505, 2 VLANs are created, one for the inside and one for the outside, where as this is not the case on the 5510. Is the problem that VLANs or sub-interfaces need to be created first? I'm doing the config via ASDM.
Everything else seems to OK i.e. access to ASDM via 123.123.123.124, outbound PAT and the site-to-site VPN.
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Mar 12, 2012
I have a Cisco ASA 5510 that was set up as a VPN server for working remote. I have disabled split tunneling so that all traffic created while VPN'd in goes through the ASA. The problem I'm having I believe would be resolved if I enabled split tunneling but I would prefer another solution. Now..for the problem.When a user is connected via VPN, they can hit all intended devices both public and private accept servers that have static NATs in the FW. So Server A has a public of 1.1.1.1 which is one to one mapped to private address of 10.1.1.1. Now if the remote user brings up a browser and goes to 1.1.1.1 it wont work. The FW gives me a error which is posted below. However, using the private IP of the server works. I thought about trying to manipulate DNS to resolve this as the remote users are using URLs and not IPs when trying to reach these servers but again, was hoping I could resolve the NAT problem that the FW seems to be having.
Asymmetric NAT rules matched for forward and reverse flows; Connection for tcp src Outside:192.168.202.100/49238 dst INSIDE:1.1.1.1/80 denied due to NAT reverse path failure 192.168.202.x/24 is the remote vpn ip given via the ASA.
Here are some configurations on the ASA:
static (INSIDE,Outside) 1.1.1.1 10.1.1.1 netmask 255.255.255.255
access-list INSIDE_nat0_outbound extended permit ip object-group DM_INLINE_NETWORK_2 192.168.202.0 255.255.255.0
object-group network DM_INLINE_NETWORK_2
[code].....
Outside with 4.4.4.4 as the public ip traffic gets NAT'd do dynamically Inside with 10.1.1.x network on it.The ASA is running 8.2
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May 10, 2012
getting my additional IP addresses working on my ASA 5510. I have a /29 allocation and outbound access and inbound access to my internal www server is working fine through the default outside interface. However, I now need to setup a second IP address that maps internally to a different web server. When I setup a new network object with automatic NAT translation to the new IP address, it does not work. If I setup the same scenario using the outside interface, it works fine. What is the proper way to setup additional IP address on my ASA v8.4?
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Sep 11, 2012
I hava ASA5510. INSIDE,DMZ and OUTSIDE interfaces are configured. I hava web server on DMZ ip:10.0.0.1 and it is static natted to 1.1.1.1. From internet i can reach to web server with IP:1.1.1.1 and from INSIDE connect to web server with IP:10.0.0.1. Now i want to connect from INSIDE to WEB server via public IP(1.1.1.1).how can configure it?
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Mar 15, 2011
Will I break anything if I create a second IP address on the physical external interface of our ASA 5510? I want to point it nowhere internally but want an active interface that can be vulnerability scanned but won't lead anywhere internally.
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Dec 27, 2011
I have one public IP address but multiple local servers that run on the same port. I cannot change the port the clients use to connect to this server, so I can't do a port map in my NAT router. The solution I had in mind, is to filter on source address. If a client from public IP X.X.X.X connects to port Z, I want it to go to internal server 10.10.10.10 and if a client from public IP Y.Y.Y.Y connects to port Z, I want it to go to internal server 10.20.20.20. Is this possible? I'm using an ASA5510 but I could also switch to a 5505 for this.
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Jul 30, 2012
I have an ASA 5510, one public IP address on my outside interface, an internal email server and a private network.I would like...
1: Users on my private network to be able to access the internet (PAT them to external outside address)
2: Email to be delivered to my MX (my single public IP address translated back to my internal email server.
i.e. can I share my single public IP address to serve translation in both directions (private users surfing the Internet (in-to-out) and an outside to inside NAT for email) ?
Email (MX) = 1.2.3.4
Public (outside) address = 1.2.3.4
Email server internal = 10.1.2.3
Internal private subnet for users = 10.0.0.0/8
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Oct 12, 2011
how to totaly disable Admin/ASDM access on our public interface of our 5510. I don't want to change IPSec or SSL access to the outside interface. Just totaly disable access to Admin/ASDM from the outside without halting all other access.
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Sep 4, 2012
I am working on a task of redirecting any unmatched http traffic to Symantec public transparent proxy through Cisco ASA. For the definition of uncatched http traffic, we have inbound squid servers for deploying IE proxy pac and redirect the http traffic to Symantec public transpraent proxy, however we can't deploy IE proxy pac to mobile device and non-support web browers.Since we have some application using IE proxy setting for direct http communication with external domains, the current symantec policy addes those domains in the exception list so that they are not redirect to Symantec public transparent proxy server.
-For the platform - Cisco ASA 5510 ASA 8.4(4)1
-For the solution, I have the following two nat rules
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Nov 14, 2011
I am having a strange requirement. actually I am not sure it is strange or not. I am having ASA5510 with 8.4 sw version. Currently one ISP is connected to it. It is working fine. We have some servers that are directly connected to internet using another ISP connection. These servers having public IP addresses configured on their LAN settings. I need to move these servers in to the DMZ zone.
When i connect it to the ASA's DMZ zone,servers will get internet through the first ISP that is already configured on ASA. But i need to NAT the DMZ servers with the IP address provided by the other ISP, which even not configured on ASA.
So what should i do? In short my requirement is
1) need to NAT the server with the IP address provided by another ISP
2) Also note that the default route is configured for the first ISP only in ASA
so Do i need to configure another default route? Do i need to make it with larger AD? So i do it will act as the secondary route only.
I need to make the ASA up and running for two ISP, and servers in the LAN should be able to NAT with the IPs of first ISP and ,the servers in the DMZ zone should be able to NAT with the public IP of the new ISP.
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Apr 3, 2011
We have plans for multiple ISPs and need to pick the correct device/architecture for that. single site: 3 ethernet hand offs (1 From ATT Fiber/10Mb pipe via their managed router, another one from ATT via Copper T1 via a separate circuit & managed router and the 3rd/last from Cable Modem/Comcast)
1.WAN hand off from another ISP from I will use ASA 5510 (already have) to use all the above 4 as inputs and then use the internal interface of the ASA 5510 as the default gateway for all the employees to browse the internet etc. so that1. If one one or more of the ISP lines die, we continue to operate (albeit lower bandwidth)
2. Also, we take advantage of the added bandwidth (even though it may not be the arithmetic sum of all the above).
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Jul 1, 2011
I need to know how to setup my ASA with dual wan links. 1 is 10/10 fiber, other will be a 50/5 Cable Wideband link. The 10/10 fiber is currnetly being used for VPN's and Internet, (about 20 point to point IPSEC vpn's currently).
I want to add the Wideband link and use the "Tunneled (Default gateway for VPN traffic)", feature for the current fiber link and the new Wideband link for any other internet traffice. I tried this however as soon as I set my fiber link to "Tunneled (Default gateway for VPN traffic), I lost all connectivity.
I also setup my "VPN" link with the "tunneled" option and my "INTERNET" link with a default route to the internet. This would only let me ping internet sites from the ASA device but not from client computers, also the VPN's would not come backup.
I have tried the sla setting with a DSL line for failover and that works good, i've since got rid of the DSL and want to utilize 2 wan links for different purposes/traffic.
ASA 5510, SSM-10 1GB RAM
ASA version 8.4(1)
ASDM Version 6.4(3)
Context Mode Single
FW Mode Routed
License Security Plus
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Jul 10, 2011
i have an ASA 5520 8.4(1) setup as follows
public wan
|
|
ASA-- public dmz
|
|
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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Aug 17, 2011
Looking to replace an "all-in-one" type firewall (UTM/Firewall, SSL VPN) with a cisco product - the issue i'm running into is that we have multiple ISPs plus WAN and DMZ - overall more than 5 ports on mid-range ASA devices - and from what i read, adding 4-port module precludes me from adding CSC module.
Is there an solution to that other than going for 5585-x model? (kind of over our budget, granted we need 2 for failover)
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Dec 5, 2011
We have a cisco ASA 5505 with sec bundle plus
We have two ISP's:
ISP1 (Our IP = 30.100.150.50, gateway 30.100.150.8)
ISP2 (Our IP = dynamic, gateway 20.100.150.9) - ADSL
Our internal LAN IP range is 10.9.8.0/24
We want to configure the ASA 5505 to allow users via ISP2 for http traffic We then want to use ISP1 for strictly VPN and access to internal web resources (eg OWA) as we have public IP's there.
Our idea was to configure two gateways on the ASA (e.g. 10.9.8.5 via ISP2 and 10.9.8.6 via ISP1)
Then give the users gateway 10.9.8.5 for web browsing etc Is this configuration possible on the ASA 5505?
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Oct 3, 2012
Site A has an ASA 5510 and a single internet connection.Site B has two internet connections (primary and backup). If Site B also has an ASA, I can configure Site A's ASA to deal with a failover at Site B (set peer 1.1.1.1 2.2.2.2). Does this work if Site B has an IOS router instead of an ASA? In other words will "set peer 1.1.1.1 2.2.2.2" on the ASA work when it's talking to IOS on the other end?
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Aug 9, 2011
I have a Cisco ASA 5510 and I am trying to set it up to be able to have it failover to the 2nd ISP connection if the 1st one ever went down. I think I need a nat statement that the "backup" connection will use when the 1st connection goes down, but I am unsure what the nat statement is supposed to be. I have added the commands that I am pretty sure that I need to add for the "backup" ISP connection. Attached are those commands, the interfaces that are set up, and the objects that are set up in the ASA.
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