Cisco VPN :: ASA 5510 - NAT Destination Address Through VPN?
Feb 25, 2012
I am trying to perform destination NAT through a VPN tunnel.my scenario traffic coming from 172.29.11.135 needs to connect to address 192.168.1.1 from the source device traffic will have a source IP address of 172.29.11.135 destination will be 172.30.14.1 traffic will hit the asa 5510 and the traffic source will stay as 172.29.11.135 but the destination needs to change to 192.168.1.1.
I have tried the different types of NAT but been unsucessful with all. My VPN tunnel will connect if the destination address does not change (NAT Exemption used). This scenario is even possible on Cisco devices. I have seen discussion that NAT the source address but not the destination address.
example config
access-list FROM_INTERNET extended permit esp any any
access-list FROM_INTERNET extended permit ah any any
access-list FROM_INTERNET extended permit gre any any
access-list FROM_INSIDE extended permit ip host 172.29.11.135 host 172.30.14.1
access-list VPN-TUNNEL extended permit ip host 172.29.11.135 host 192.168.1.1
**I have left other config statements off as the NAT config used previous has not worked and the VPN tunnel does build when using NAT exempt.
**All ACL have been applied in the inbound direction on the respective interfaces. Two static routes have been applied to the FW directing inside traffic inbound and all unknown traffic outbound. I have not defined a specific static roule for the VPN traffic allowing the default static to perform that function.
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Jan 23, 2012
im lookin to establish a a multiple L2L ips tunnels ( one tunnel for each subnet) from my cisco asa 5510 to the same destination. should the cisco asa capable of this ?
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Mar 13, 2012
Here is a snippet from "show ip cache flow", from a border router of our network; [code] To clarify, Gi0/3 faces our customers, Fa1/0 faces a transit provider. These results have come from configuring "ip flow egress" on Fa1/0, facing the transit provider. 1.2.3.4 is a static IP we have assigned a customer. I know this customer has a firewall terminating this connection so I want to understand the cache flow results on this route. Why is the destination address an RFC1918 address? Is it possible that the customers firewall is trying to connect to these addresses, the flow gets as far as this border router, and drops? I assume that to be false, and only successfully initiated flows are recorded?
Also, looking at those figures it's IP protocol 0x11 which is UDP (17) and source port 62023 to destination port 161. 161 is SNMP? Without asking the customer what they are doing I suppose I can never know at that level, but I'm really more interested in why these flows are showing at all, when 192.168.1.0/24 isn't in this routers FIB?
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Jul 15, 2012
i have a situation where i have a deployed asa5505 running 8.4.1.The client has an existing mail server that is located on their lan and has Port Nat's configured for the normal mail ports, 25,110,993,587 etc.
This works fine for mail inbound and for any user popping mail off the server externally or visiting the webmail interface from outside the network.However when users inside the LAN try to connect through the ASA back inbound to the IP on the External Interface of the ASA they are unable to do so.
One solution i came up with is Split DNS. and well this works it rely's on the users not changing their dns servers.I was wondering if it's possible to do some sort of NAT that rewrites traffic destined for the above ports on the external IP to the Internal LAN Ip instead.
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Sep 21, 2011
Is it possible to assign a static route to an interface and not globally on a ASA 5510 ver 8.3.
I have two links between my offices one for Data via a VPN and one for video traffic which is a secure connection with QOS end to end.
All interfaces are on the same security level of 100 except Outside which is 0.
Office 1 Interfaces ASA 5510
VLAN 1 vOffice1Data 10.40.1.0/24
VLAN 3 vOffice1Video 10.40.2.0/24
VLAN 5 vInterOffice 10.40.5.0/24 (QOS connection Between Offices)
[Code]....
At the moment if I try and access data from VLAN 1 to VLAN 4 it gets to the destination ok going through the static route and over the vInterOffice connection but the problem is VLAN 4 returning the traffic. This fails because there is no static route back to VLAN 1. If I create a static route from Office 2 to VLAN 1 then it will route all my data traffic over it as well.
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Jul 9, 2012
I have a Cisco 2600. I would like to know how to redirect traffic going to a certain IP address three hops away to an IP address on a locally connected segment.
Ex. Packet leaves a device with source IP of 10.10.10.10 and destination of 20.20,20.20 When the packet hits the router (10.10.10.1) I want the router to redirect the destination of 20.20.20.20 to 30.30.30.30 (locally connected segment).
The router has two physical interfaces.I am thinking along the lines of creating a VLAN with an ip of 30.30.30.1 and then doing a NAT translation from 20.20.20.20 to 30.30.30.30.
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Sep 25, 2012
we're looking to use an ASA5505 or 5510 as our firewall but want to see if one of them can prioritize traffic. I know it does QoS but we're wanting to dedicate x amount of our bandwidth to traffic based on destination IP address. Is that possible and does it take a license upgrade?
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Sep 26, 2012
transport the serial0 and serial1 from a remote route to a local router at his local serial0 interface.The routing mechanism is very easy, it like a RS485, incoming data at the local router is trasmited to the remote serial0 and serial1. If some data income at the serial0 or serial1 at the remote, this data travel to the local an is printed into de local serial0 Remote Serial0 and Serial1 ends at the local Serial0. The local Serial0 starts and ends at the remote Serial0 and Serial1.Both serials are RS-232 (is a async-protocol group)The RS-232 protocol is UNADDRESSED The application is a back-up serial link.
My Config is:
LOCAL R236:
bstun peer-name 192.168.33.236
bstun protocol-group 10 async-generic
interface serial0
physical-layer async
[code]....
If i debug the BSTUN PACKET:
*Mar 7 02:31:18.182: %BSTUN-3-NOPEER: No peer configured to route frame with destination address 0 (bstun group 10)
At the Cisco IOS Software System Error Messages ARAP Error Messages Manual notes:
BSTUN-3-NOPEER: No peer configured to route frame with destination address
[chars] (bstun group [dec])
Explanation A BSTUN route has not been configured for the frame with a destination address.Recommended Action If this message appears while you are debugging BSTUN, it indicates that no specific BSTUN route has been configured for the frames being received with the device address listed in the packet debug trace. You may choose to configure a BSTUN route, or ignore this message.I know that the address must be content on the frames that income at the serial port interface, I mean the router fordward the frames if this have some BYTE and the start that indicate what is address of a remote device, so i guess that this routing mechanism use that byte to select the remote router.But If I set the address at the local and remote route, the router is not who must include his own address in the frame?If I set a point to point link, the only way if I want to transport more that 1 link,? for now the only way is set TWO groups and set one for first link ant the other for the second. (Serial0--Group1--Serial0 and Serial1--Group2--Serial1)The router do not let me set the same group ant the same route. where at the Serial interface i set the LOCAL ADDRESS for a BSTUN protocol?
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Feb 8, 2012
i recently get high speed link for my compagny to replace the old frame realy.the internet service provider gave me a non routable range to set on my asa like this : [code]then the ISP tell my public ip wan range was x4.23.209.166/29.i made this kind of configuration works when i put a cisco routeur in befor the cisco asa like this: [code] it is possible to make this works on cisco asa 5510 without putting a router in front ?if it works problem can happen to establishing vpn from the outside interface having a private ip ?
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Aug 19, 2012
We have a strange issue for one of our customers that recently migrated to our internet service.They are trying to vpn to an external ip address not controlled by ourselves. The issue is only on one subnet and isolated to Mac’s, PCs in the same subnet also work fine. They were able to vpn from the MACs before they migrated to our INET solution. They previously used a checkpoint FW for their outside NAT and firewall and now are using a failover pair of asa 5510s. I have packet traced out the firewall and there should be nothing blocked. UDP ports 500 and 4500 are open to the destination ips from the correct subnets. All other subnets with Windows PCs can vpn out to external ip without issue. The users in that subnet with the MACs can also browse internet fine so the routing and nat overloading is also ok
When they try to initiate a connection from the macs i can see the connection/xlate coming in from a source port of udp 4500/500 and also a destination of udp 4500/500 instead of a random source port. Just this evening we managed to get one device connected but no others. Would the fact that the source port is claiming 500 and 4500 stop the other macs using the same source ports at the same time to connect out? They are using the onboard mac vpn client, he can’t get the Cisco one working at the minute. [code]
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Jan 4, 2012
I have setup a site to site VPN with an ASA 5510 (8.4) and a Cisco 2811. The tunnel is working fine, however both sites have 5 different contiguous networks. The crypto ACL between sites states only one subnet.Is it possible to state a summary address in an ACL rather than having five lines for the ACL?The tunnel works when the router uses an ACL of 10.2.200.0 0.0.7.255, however if a summary address of all the subnets on the inside network of the ASA are stated in an ACL - 10.1.200.0 255.255.248.0 - then the tunnel does not come up.Is it possible to state a summary address on a crypto ACL on the ASA?
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Jan 17, 2012
We have an ASA5510 running version 8.25. This is in our central office in London. The London network has an ip address range of 10.110.128.0/22. Connected to this via a site-to-site VPN we have a satellite office that has an IP address range of 172.16.148.0/22.
We have now connected to our parent company via another site-to-site VPN connected to the same ASA5510. Their network has an internal range of 10.110.18.0/24. It was our parent company that issued us with our range of addresses a long while ago so that it all fits in with the rest of the company.
We have resources (web servers) on their network that we use which work just as it all should. We now want to allow our satellite office to view those same web servers. The problem is that only 10.110 addresses can flow to our parent company.
I have configured the firewall at our central office and our satellite office to route across to our parent company via our network network and the packets are flowing just fine except that obviously once they reach our firewall they cannot go to our parent company because the 172.16.148 range cannot be routed there.
My idea is to NAT traffic from our satellite office to one of our local addresses before it goes over to our parent company network.
For example: If someone in our satellite office with an IP address of 172.16.150.5 attempts to request a resource from 10.110.18.12 then the request would go via the VPN to our firewall and then get NATed to 10.110.131.200 before being passed on to our parent company network.
My question is what would the NAT configuration be to achieve this. I just cannot work out what type of NAT I would need or how to construct the command. It's probably PAT as it will be multiple addresses to a single address. Essentialy, all traffic from 172.16.148.0/22 destined for 10.110.18.0/24 should get NATed at our firewall to 10.110.131.200 before being passed on.
Just to add, we already have this working from our Cisco 3000 Concentrator which is now going to be phased out hence trying to get this to work on our ASA. The satellite office has now been moved to the ASA and as of today our parent company has been moved to the ASA.
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Mar 3, 2013
I am using an ASA 5510 firewall in routed mode.How can I filter incoming traffic by mac address on the AS 5510 ? I have already setup a static access rule for rdp users on the outside to access a terminal server on the inside.Now, i would like to further limit access from specific computers only.
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Nov 16, 2011
I added a new server and created a new static NAT assignment on the ASA 5510 to the server's IP. When I browse to the web to check what public IP it's reporting, it shows the wrong IP. I disabled the network interface on the server, ran "clear xslate", reenabled the network interface, ran "sho xlate" and while the correct translation was in the table, the server still reported the wrong IP address.I even ran a packet trace and it showed the IP address being correctly translated to the proper public IP, but when I browse to the web I get the same erroneous public IP. [code]
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Mar 27, 2011
I am using the Cisco VPN Client 5.0.06.0160 - and am having an issue connecting to my ASA 5510 via VPN. This issue is happening on 1 of our laptops. All other laptops connect just fine. So the problem is not in the ASA. I have double checked the client setup and config and it too is correct. The interesting thing is, we are connecting to an IP Address and not a host name.
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Apr 5, 2011
can i have 2 pools each with diifferent subnet [code] i wanna put restricution on remote vpn users having address from pool-2,and just give them access to 172.16.10.0/24,is it possible on the asa 5510?
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Nov 28, 2012
We have hosted spam filter service with 3rd party vendor. My vendor is switching to different spamming services and I need to add ip address lets say 44.33.454.32 to the list of allowed system that can connect to my smtp service. I am going over my firewall 5510 configs and I think I need add the entry like this: “access-list outside-to-inside extended permit tcp object-group obj-44.33.454.32 interface outside eq smtp”. [code]
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Mar 17, 2013
Is the following sysntax correct in removing a remote access vpn address pool and inserting a new one on an ASA5510?
(config)# NO ip local pool BWCVPN 192.168.200.1-192.168.200.128
(config)# ip local pool BWCVPN 192.168.300.1-192.168.300.128
(confif)# tunnel-group BWCVPN ciscovpn general-attributes
(config-general)# address-pool BWCVPN
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Dec 10, 2012
I have just started to use an ASA 5510 for my network. I use the DHCP server on it and after i made the change over to ASA hosts started loosing their IP address. This was not a problem before on my old firewall that aso had the roll of DHCP.
Is it possible that something is wrongly sett on the asa? All traffic is flowing normaly when this does not happen.
Information:
Lease length: 172800
address pool: 134 addresses
hosts: around 45 + mobile units 45
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Jan 19, 2013
Is it possible to perform static Nat's through an internal network?I have a ASA 5510 with a public outside interface (let’s call it 68.68.68.1), and I have an inside private IP address (192.168.1.2/24). The inside IP address leads to a 4900m with that interface being configured with a 192.168.1.1 (no switching). On the 4900 M I have several VLANs one of them is an internal DMZ of sorts. (192.168.2.0/24). Within this DMZ network are several Web servers which need to be associated a public IP address (68.68.68.x).
Every time I configure a static Nat to associating a public IP address with an internal IP address within the DMZ, packet Tracer on the ASA informs me that the packet gets dropped at the static Nat and I cannot figure out why this is so.Safe it to say my question still stands is it possible to Nat (68.68.68.222 to and 92.168.2.60) given the configuration above, and how would I go about configuring in such the manner above so that I acn apply static nat through the 192.168.1.0 network to reach the 192.168.2.0 network.
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Jul 11, 2012
i'm running a 5510 asa and the vpn has been working great for a while. We recently change our network provider so i had to change the public ip, and dns on the firewall... now i can still connect via the vpn and browse accross my mpls to other sites, but cant really access anything on the native lan that the firewall resides on?
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Dec 25, 2012
We have an ASA 5510 and we also have two separate address pools which have been provided by our ISP. The addresses are not contiguous. Is there a way to configure an interface on the ASA to handle both sets of public address pools? If the outside interface is set up on eth0/0 would I create two subinterfaces (eth0/0.1, eth0/0.2) and assign each subinterface an address pool? Then just NAT/PAT to my heart's content? At that point I would want both to route to our inside network. So it's basically two inbound sets of IP addresses comming into one interface and then comming into the network... Right now the outside interface is configured with our first set of IP addresses. We wanted additional addresses and when we called our ISP they told us we already had them - just a different pool. Hence the question. I'm guessing that I wouldn't put anything specific on the outside interface and I would put the specifics on the subinterfaces?
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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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Apr 5, 2012
We've had issues with our Exchange 2010 server (running on ESXi 4.1) since its default gateway was changed to our new ASA 5510. They manifested as frequent Outlook client connection dropouts or as IP address conflicts whenever Exchange was rebooted. The temporary fix was to disable the Exchange server NIC, bounce the ASA and enable the server's NIC again. We saw poor performance from Exchange after a while again, but after some research and testing I realised that disabling proxyarp on the inside interface fixed the problem permanently.
However I've now realised that the client VPN no longer routes properly because proxyarp is disabled on the inside interface, so I still have a problem.
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Apr 10, 2011
Using Cisco ASA5510 Security Plus (Post May 2010) with 8.2(1)
I was trying to limit the number of internet IP Address that can initiate Remote Access VPN connection to the firewall. I have plan to only allow internet IP Address from few ISPs for control.
However, blocking AHP, ESP, ISAKMP, NON500-ISAKMP, and IPSec Over TCP Port Assigned in the firewall outside interface doesn't work. But it works by putting the ACL in the router before the firewall. It seems that the firewall have a "hidden" process VPN first before user entered ACL (or explicit rule), similar to Checkpoint FW's implied rule. How to get around it?
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Nov 4, 2012
We will be moving to a new data center in the very near future and with them our WAN IP addresses will be changing. Any best course of action for changing the IP addresses throughout the firewall configuration? Would it be possible/suggested to export the running-config, make the neccessary changes, then import the config? I am familiar with the ASA 5510 only so far as changes are required. It is not something I work with on a regular basis.
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Mar 14, 2013
I have a Cisco ASA 5510 I am using ASDM 6.1
I have a LAN and a DMZ and an internet connection. I am using one of the internet connection IPs to host a HTTP service on a server in my DMZ. (its the same interface as my internet connenction but a different IP to the one used for internet connectivity)
so say my LAN is 192.168.1.x
and my DMZ is 172.168.1.x
I can access DMZ from Lan and vice versa. when i try to access the public IP (or URL) from a pc in my LAN i get nothing.
I have enabled DNS rewrite (doctoring) but it is still not working. the HTTP service is available from other sites.
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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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Jul 24, 2011
I have a situation which requires some non best practice stuff to be done. There is a box behind an ASA that has a lot of code that references public DNS names and therefore needs access to itself and a number of other boxes on the same subnet via the public DNS names (that obviously resolve to public IPs). This traffic is dropped on some pretty fundamental ASA characteristics.I know this isn't really ideal, and it should be handled by DNS nstead, but I'm in somewhat of a bind and need to know if the ASA can allow this traffic.I figure I could match the traffic and exempt it from state-checking and that would probably work, but it's not a very graceful solution.
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Feb 27, 2013
I configured dns on the router on this command ip name-server 4.2.2.2when i tried to ping www.google.com showing no valid routeTranslating "www.google.com"...domain server (4.2.2.2) [OK]Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 2800:3F0:4001:807::1013, timeout is 2 seconds:
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Aug 2, 2012
a) one router with two ethernet interfaces (LANs) and a serial interface. The serial interface is connected to the internet, dynamic nat is used for hosts in the two lans. A web server has a private address of 172.168.50.10 and it is being translated to the internet with serial's interface 68.32.x.x (public ip) with static nat. Clients in the internet type the public address to access the web server.
b)Problem: clients inside the LANs cannot access the web server by typing the public address, they use the server's private address instead, this create a problem with DNS static entries in the HOSTS file in the OS. It is a test server and is only available to authenticated users (lock and key ACLs), so no need to make a real DNS record. The entry in the HOSTS file points to the public address.
c)Question: how can a create a route map to change the public address in the HOST file to the private address of the test web server everytime a user in the LANs type the domain name.
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Mar 4, 2011
I have several Cisco switches connecting our network. Switch N connects to the gateway, Switches Y & Z connect to some hosts. Switch N connects to Y and Y connects to Z. Assume our gateway IP is a Class B address with a netmask of 255.255.254.0 and all the hosts attached on switches Y & Z have static IP addresses assigned to them. This gateway connects to the internet.In addition to this IP address, some of the hosts also have a second IP address assigned to the same NIC. This IP is Class A (10.0.###.###) and have a netmask of 255.255.0.0 A second gateway address is not defined.
The hosts that have 2 IP's bound to their nic, use the 10. address to communicate with each other. (Programs running on the hosts are specifically configured to use 10. address).I have several questions regarding this setup:
1) Assume Host has only 1 IP (Class B) - if the destination is on the same network, does the host system send the packet to the gateway first to find the destination on the network or does the host send a "where are u" packet to the broadcast address to find the destination?
2) Assume Host as 2 IPs (Class A & B) - if the destination is a 10. address, how does the host go about finding it?
Since there is no Gateway defined for the Class A address, does the host simply send out a packet to the broadcast address for the Class A network? or does it go to the gateway defined in the Class B network as it was defined first (i'm assuming primary connection)
3) Assume Switch N's connection to Switch Y is disabled - how will this affect communication between hosts on Switches Y & Z that have a 10. IP trying to share data with each other, using the 10. Address. If the answer is this should not affect it, what additional circumstances are required that may cause the systems with a 10. address to be unable to communicate when the connection from Switch Y to N is terminated?]
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Jun 17, 2013
One of end costumers is trying to configure IP Accounting on 7206 running version 12.4(4)XD8,The issue we are having is that while the physical interface is up (the sub interface is part of a metro line which is directly connected) we dont see packets being accounted if the destination IP is down.
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