Cisco Firewall :: Setup Of IPSec Passthrough On ASA 5520
Mar 28, 2012
I am working on IPSec Passthrough on an ASA 5520, with version 8.3, and ASDM 6.3. Currently I have a requirement for users in my internal network (10.10.249.128 / 25) to be able to connect to external IPSec VPN servers.
So I created a network object with 10.10.249.128 / 25, and used dynamic PAT to translate the source ip address to the external internet facing outside interface:
I then added the following rules on the inside-in ACL: However troubleshooting shows that isakmp is passing through the firewall, but esp and ah is not.
For isakmp:
For ESP:Seems like the nat rule is drawing my ESP traffic,
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Jan 13, 2012
In a cisco firewall 5520 how could you take a public wan connection and pass it to another firewall behind the 5520 without using nat. How could you put a single port on the 5520 into transparent or passthrough much like you can on a broadband modem?
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Jan 31, 2012
I'm trying to find a reference for how many IPSEC tunnels the WRVS4400N can passthrough.
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Mar 2, 2013
I have two ASA 5520 units, both running version 8.3(2) code. Among many other uses, they have an IPSec tunnel between them to link office 1 and office 3 together. Office 2 does exist, and is connected to a different port on the ASA in office 3; there is no IPSec involved with office 3.
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Mar 20, 2013
How can I see the quantity of traffic that is passing through into an IPSec VPN in a ASA 5520.
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Apr 11, 2013
I'm trying to achieve a site-to-site ipsec tunnel to a Cisco ASA 5520. Most examples feature the ASA with a public interface that terminates the tuennel and a private network on another interface that the tunnel interacts with. Where my scenario differs is that the interface that accepts the tunnel is part of a public /29 network where I want the remaining hosts on that subnet to be able to route thrugh to the other end of the tunnel. My tunnel gets established, but any attempts to route via the IP assigned to that one interface result in the ASA rejecting traffic. If so, what configuration options should I consider?
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Jan 7, 2013
Need to check how many tunnels IPSEC are running over ASA 5520.Tried commands which we use on Routers no luck?
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Aug 19, 2012
we wish to implement IPSec remote access vpn with the condition that employees should be able connect to this vpn only from company issued laptops and not from any other computers. I assume using client side certs is one of the ways to do it but I couldn't find any doc that was really useful. Cisco's documentation seems quite obscure. We are on 8.1 (5520)
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Feb 14, 2012
Any setup passthrough mode of the Motorola NVG510 router ATT makes you use with U-Verse to a CISCO 877 or similar, with a block of public addresses they want to use? It is So frustrating that I have to deal with this NVG510. It is NOT a very business class router... I am assuming that I need to put it into "pass through" mode for the Cisco to be able to manage what happens with my assigned public addresses. If there is another way, let me know!
Here's what I plan to do: I've read the "related to" post above, about putting the NVG510 into pass through mode, and I plan to do this as it discusses. I'll assume that works for now. But it will assign the router's WAN IP Address to the router's "outside" interface, not one of my private IP addresses. On the Cisco side, here is what I would do: vlan1 interface is my "inside" private network. Create vlan2 interface using dhcp to get IP/gateway from the nvg510, or set it up manually, whichever works... This interface will be the "outside" NAT interface. But this interface's address will be the router's WAN address, NOT the first of my 5 public assigned usable addresses...
Here is how it will be setup:
interface FastEthernet0
switchport access vlan 2
[code]...
Then - make it my default NAT interface: ip Nat inside source list 110 interface Vlan2 overload
If I stop there... I assume I could then NAT ports from my different private addresses to the various servers in my office. But the router won't have an interface with that first assigned-to-me public address. The reason I ask is that we have a site-to-site crypto- map defined, and the interface it is defined on determines the IP Address it will communicate from. I wanted this to be my own assigned public address, not the WAN address of the router... Not sure how I would do that though... Same with the default NAT assigned to vlan2 - by default machine in access list 110 will get to the internet with the WAN address of the nvg510, not my private address.
Can I create interface vlan3, somehow linked to vlan2, give it the first private address in my block, and then move the cypto-map to this interface, and also change the default Nat to vlan3 now instead of vlan2? ip nat inside source list 110 interface Vlan3 overload
How would I go about doing such a thing? I am not a Cisco expert, I understand just the basics... This is a bit more complicated than I can figure out. Or maybe it is not possible? Will I have to, for any computer that needs unsolicited traffic through the internet to use one of my assigned public addresses, to setup a one-to-one NAT for that address to that internal address? And everyone else is stuck using the WAN address. If this is the case, it is not right... What were they thinking when they designed this router and forced us to use it as a business class U Verse customer? This should NOT be so difficult/complicated.
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Apr 18, 2013
We are setting up an old office building as an offsite data center. The network cosists on a PIX 501 firewall and a 2811 router. I am attempting to setup a GRE tunnel over IPsec back to the main office. The main office consists of a PIX515, a 2821 router, and a 2921 router.
There is also an ASA5510 in our main office that is used as our primary connection for all of our external services and as a GRE endpoint for our other offices. The PIX515 is used to connect our main office clients to the internet and we would like traffic between it and our offsite data center to go across it as well. The default route is to use the ASA. We used policy based routing on the 2821 and 2921 routers to direct the appropriate traffic to the PIX515. Right now I am not able to get the tunnel setup. It appears that the offsite datacenter is sending packets but is not receiving any when I issue the “show crypto ipsec sa” commands on both firewalls. I will show the output of that command below.
Main Office The external address 198.40.227.50. The loopback address 10.254.10.6 The tunnel address 10.2.60.1
Offsite Datacenter The external address 198.40.254.178 The loopback address 10.254.60.6 The tunnel address 10.2.60.2
The main office PIX515 Config :
PIX Version 7.2(2)
!
interface Ethernet0
mac-address 5475.d0ba.5012
nameif outside
security-level 0
ip address 198.40.227.50 255.255.255.240
[code]....
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Jan 18, 2012
I need to setup an ASA 5520 to correctly NAT over two wan links. The idea sounds pretty straingforward but it does not, I have only 2 IPs that are involved with the NAT
192.168.1.10(Nated Server) -- 172.16.1.10(Web Server)
I have 2 interfaces that sould be applied to it let's say outside1, outside2. The server is reacheable through each outside interface, the outside interfaces is selected uppon dynamic routing and that is working OK.
So if link outside1 is up the Nat follows this schema 192.168.1.10(inside) -- 172.16.1.10(outside1)
that works fine, but I want that automagically changes over when the link outside1 is down to 192.168.1.10(inside) -- 172.16.1.10(outside2).I know I can't have a NAT with 2 IPs and 2 different interfaces (ASDM doesn't allow me to), is there a way to implement this??
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Sep 15, 2011
I want to setup NAT with ASDM on ASA for a client and I can not make it work. I have several interface:
Inside: 10.97.0.1 / 24
Outside: 10.0.1.70 /24
Interco: 192.168.6.1 /24
Other Sites: 10.26.0.4 /24
All routing in the network is Ok My customer want to access a server @ ip 10.194.70.1 in https on the interface Interco with his nat address as 10.97.0.11 .This server must be accessible with the address 10.97.0.11:443 from interfaces inside, outside and other sites.And source address must be nated with original destination address 10.97.0.11 to be redirected on 10.194.70.1.
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Jan 30, 2012
I am trying to setup an active/standby failover with 5520's running 8.4(2) and am having problems with it not dropping connections during the failover. I am using a portchannel from the switch to each ASA and using sub-interfaces off that. I'm using the command Failover mac address Port-Channel1 “mac-address on primary Port-Channel1” “mac-address on standby Port-Channel1”.The command goes through but doing a show interface port-channel1 doesn't show a change in the mac address on the secondary unit after a failover when it becomes active.
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Jan 17, 2012
I have switch cisco 2960 ,When you boot it displays the message that is unknown for me.
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Aug 23, 2011
Using a Mac running Mac OS X 10.6.8 with VPN Tracker 6.3.0.Before switching to the WAG320N I had no issues with my IPSEC VPN client. After the switch it consistently fails in Phase 1 negotiation.In the log file of the gateway I only notice: Mon, 2011-08-22 07:47:31 - [Outgoing] UDP Packet - 192.168.1.100:500 --> IP.ADDRESS.VPN.GATEWAY:500.The software itself complains about timeouts while contacting the remote gateway.VPN pass through is enabled, no port forwarding is set up, firewall is disabled.
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Sep 20, 2011
Any step by step guide to setup syslog for site to site VPN.(in ASA 5520)Just send me the step to monitor site to site vpn using that in ASA 5520.
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May 22, 2010
Currently running a pair of 5520 as VPN routers. running 8.0.3, been using only Anyconnect SSL VPN for end users. These boxes do nothing else except serve VPN clients.However, recently we tried testing some IPSEC clients and are realizing that the Anyconnect SSL VPN clients is about 10x slower than the IPSEC client.From my house, downloading either CIFS or FTP, I can pull pretty close to 1.0mbps, while using Anyconnect, I pull 0.1mbps. What could be causing this slowdown? Should SSL VPN performance be on par with IPSEC? Clients all are windows 7, 64 bit. and the testing is being conducted on the same device.
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Nov 19, 2011
The network design is a hub and spoke using a carrier provided MPLS network with a ASA 5520 at the hub that has a IPSec tunnel to another part of the company.This configuration has worked for sometime now (long before I came to the company a couple of months ago).The thing that does not make sense to me is that the those networks out on the spokes did not have a route to the inside interface network of the ASA. With the way this MPLS works, if a network is not in the MPLS network routing tables it will not pass that network. The network was not in the MPLS network, nor was it in any of our edge routers connecting to the MPLS.
These hub networks did have routes both in the MPLS and edge devices for the networks on the other side of the IPSec tunnel and have been reaching them for some time.So what I am trying to understand is how it is possible for these hosts that have no route to the ASA inside interface network, but do have routes to the remote networks, how are they able to successfully pass that traffic? There are no NAT devices between these WAN hosts and the ASA.
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Feb 17, 2011
I have a client that uses the ASA 5520 as both a firewall and VPN termination device. Day to day VPN usage is 30-50 users and the memory (512 MB) is typically at 50% while the CPU is mostly under 30%. I've suggested the RAM be upgrade to 1GB.The client would like to add a large block of VPN users which could see 250-300 concurrent users. What kind of a system resource hit should the expect with this level of load?
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Jun 24, 2012
I have made the following change to my ASA 5520 using ASDM to try and force VPN clients to use a self assigned certificate from the ASA. I made the following changes Remove Access VPN > Certificate Management > Identity Certificates > Add Certificate.Then I made the following change.. Remote Access VPN > Network (Client) Access > IPSec(IKEv1) Connection Profiles > Connection Profile > Edit > IKE Peer Authentication > Pre Shared key and pointed the identity certificate to the one I created in the step above.Having made this change I am still able to VPN without a certificate configured in authentication settings.I was expecting that the VPN would attempt to issue the self assigned cert to client machine?
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Feb 15, 2011
Options a user may reside in Austin, TX and I want the user to utilize the local proxy (i.e. texasproxy:8080). We currently only require the user to enter the RSA passcode and username to authentication (RSA/AD username are identical). Is there a way to have the user authenticate via RSA and have the user's AD group membership (TX) assign the user the specific IE proxy settings? We are utilizing an ASA 5520 on 8.2, but we are willing to upgrade to newer IOS or even consider anyconnect to resolve this issue.
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May 28, 2012
Currently we are having a 2 ISP for Internet. Need to achieve redundancy for IPSEC VPN using the domain.
Requirement :Will configure a domain and assign two public IP address from 2 service providers. Will set the priority for the public ip address and do the manual change during the ISP failure.We will provide the domain name to the clients to setup the IPSEC VPN.So incase of failure by one ISP, we will change the priority in the domain to point to the availble address.So that we can reduce the downtime and no need of configuring new IPSEC VPN tunnels.
Question :Whether we can achieve this in Cisco ASA 5520.Or do we have an alternate solution to overceome this solution.
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Sep 8, 2011
When I try to add CAS to CAM a cannot choose a OOB Virtual Gateway or OOB Real-IP Gateway, because these operation modes are absent in Type list.What can be reason it?
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Apr 4, 2011
Here is the situation: A CISCO871 router is configured to establish an IP SEC tunnel with a CISCO ASA5520. The configuration is OK about that. I wish to configure the same CISCO871 in order to establish a LAN-to-LAN IP sec Tunnel with another CISCO871 at the same time in order to reach private network. So, I have followed the Cisco procedure Document ID: 71462 "LAN-to-LAN IP sec Tunnel Between Two Routers Configuration Example"; it works, I can reach the peer private network BUT ONLY when the IP SEC tunnel with ASA is not established.
It seems to be a routing problem...I don't find how to configure to make both tunnels up and functional at the same time.
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Jun 26, 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, and dns resolution does not work.
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Jun 23, 2011
I am trying to set up remote access vpn on an asa 5520 running 8.4.1. I have the ipsec group, policies, and ip pool set up. When I try and connect with the cisco vpn client I see the following in the logs. Deny icmp src outside:214.67.39.42 dst outside:24.252.51.73 (type 3, code 3) by access-group "acl_inbound". Do I need to put in some firewall rules to allow this traffice so that the VPN can connect?
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Aug 25, 2011
I am currently having some problems on our 5520 ASAs. The problem is the IPSec VPN clients not being able to connect. We have had an issue twice this week where this happened. Earlier in the week we had folks not able to sign in, but some folks who were connected already stayed connected. The ASAs had been up for 200+ days and no changes have been made to it recently. At that point I had to reload the ASAs so users could start signing back in to it. Today we had a similar issue, but I didn’t have to reload the ASAs. The issue‘resolved’ itself. The VPN clients are getting Error code: 433 and the ASAs are getting Reason: Peer Address Changed when this occurs.
ASA5520, 2048 MB RAM, CPU Pentium 4 Celeron 2000 MHz version 8.3.2.
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Nov 13, 2011
We have multiple vpn tunnels coming to our cisco asa 5520 , the problem is that when we create another tunnel with the same network as another network on the firewall , it does not know how to route the traffic to which interface or sub interface.
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Mar 27, 2013
We have set of PC's who will be connecting either RA IPsec or SSL VPN to another location. On our site, our perimeter device is an ASA 5520 8.2(3). The interfaces on this ASA doesn't have Access Lists applied, so from what I understand, there is a default policy applied globally (class-default). Now my question is: If we set up vpn clients on our pc, are the ports used by the clients to the VPN server allowed by default or do we need to tweak the class-default?
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Mar 25, 2011
i have configure l2tp/ipsec vpn on cisco ASA 5520 and also configure windows 7 client but its getting error
Error in ASA debug log
debug crypto isakmp 7
Mar 26 07:44:28 [IKEv1]: IP = 59.161.130.13, IKE_DECODE RECEIVED Message
[Code]......
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Sep 10, 2012
I would like to know if the ASA 5520 BUN K9 supports the data compression on VPN IPsec.
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Mar 7, 2011
Is there any documents that I can use to design an IPSEC remote access solution using 2 data centers . One data center is primary and other one is secondary. The VPN is terminated in ASA 5520. End users using cisco client.
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Sep 8, 2012
I have a site-to-site VPN configured between a 5520 at our data center, and a 1700 at a client's site for site-to-site connectivity. What I've noticed is, is that the VPN can only initiate from my Data Center, never from the client router. I can telnet into the router and start a telnet session sourced from the "inside" interface and it fails, yet I can see the NAT translations get created in the state table that should match the crypto-map. However, if I ping a host on the inside of the remote LAN from my workstation (behind the 5520) to bring the tunnel up, and run the exact same command on the client router once the tunnel is up, it works. Right now I have a continuous ping running from my workstation to keep the tunnel up, but obviously that's not the best solution
I had to modify this config to NAT the LAN addresses at the client to a non-overlapping subnet, so anything coming from 128.1.0.0/16 should be NAT'd to 192.168.105.[50-200]/24. I've also got two static NATs for inbound access from the data center and those seem to work fine.
Current configuration : 2787 bytes
!
! No configuration change since last restart
!
version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
[code]...
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