Cisco Firewall :: ASA 5510 - NAT And Internal Network Routing
Apr 16, 2013
I am having a problem getting my ASA to work properly. I attached a diagram for reference and most of the config is below. When I finally got it to route properly between 2 sub nets on the internal network, the NO NAT statement broke routing for the VPN Clients who rely on a NAT statement for the same sub net that is listed in NO NAT access list. I can get one of the 2 to work by replacing NAT statements but can't figure out a combination to allow routing for both the internal sub nets and the VPN clients to work.
It's been about 5 days of tweaking this thing just to get the internal routing to work correctly and when I finally did I broke VPN client access. To note, the VPN clients can still log in and get a session going, they just can't get anywhere once they are in. I also think there's a lot of stuff in this config that is not needed like a lot of the object groups, etc. but I am being very careful about removing anything. I took over support of this ASA after someone else put it in place and over this past weekend we moved it to a new building and new ISP and that is when I had to get it to route between sub nets. The main point of this move was to remove building 1's reliance on building 2 for Internet and outside email access in the event that building 2 is not available (it is close to water and this has happened more than once over the past year).
So that is why I can't go with the smartest option of just keeping the routes on the router in the other building. I also know the 1600s are ancient but they're all we have for now. I can provide those router configs also but they are VERY basic, all static routing. The IP for the Cisco router on the same sub net as the ASA is 192.168.42.254.
This is the statement that allows the routing to work between the 2 internal sub nets but breaks VPN clients: nat (INSIDE) 0 access-list NO NAT
This is the statement that allows the VPN clients to work but breaks the internal routing: nat (INSIDE) 0 access-list INSIDE_nat0_outbound
The rest of the config is below the diagram.
ASA Version 8.2(2)
host name Cisco asa
domain-name default.domain.invalid
enable password - encrypted
password - encrypted
names
dns-guard
[code]...
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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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May 12, 2012
I have an ASA 5510 configured 3 interface Internet_AAPT, Internal_Network and Server_Network. The server network works fine as is able to connect to the internet and services like port 80 work from the internet in. But from the Internal_Network can only get to the server network but not internet (6May 13 201214:17:4030201310.153.111.21253663199.47.216.14880Built outbound TCP connection 42508 for Internet_AAPT:199.47.216.148/80 (199.47.216.148/80) to Server_Network:10.153.111.212/53663 (10.153.111.212/53663). The weird thing in logs i see a connection being made but for some reason its referring to the Server_Network interface? below is my current config...
ASA Version 8.2(5)
!
hostname ASA01
domain-name names
name 10.153.11.184 QNAP
name 10.153.11.192 exc2010
name 10.153.11.133 zeacom
[code]....
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May 17, 2012
Having trouble with a couple items. First of all, should I be able to ping the inside interface of the ASA from all internal subnets assuming all of these subnets/vlans are directly connected to the same L3 switch? I can ping the ASA inside interface from our L3 switch, but I cannot ping the inside interface from a host on a different internal subnet. I have setup static routing on the ASA [
route inside 10.10.96.0 255.255.248.0 10.30.1.1 1]and verified that I can ping the host [10.10.96.212] from the ASA inside interface [10.30.1.5]. The inside interface is on the 10.30.1.x/24 subnet. My host is on the 10.10.96.x/21 subnet. From the ASA I can ping 10.10.96.212, but I cannot ping 10.30.1.5 from 10.10.96.212. I can however ping 10.30.1.1 from 10.10.96.212.
This leads to my next issue, which is trying to setup the ASA to work concurrently with our current firewall. I'm doing this in order to transition to the ASA. I'd much prefer to cutover inbound NAT a little at a time vs. doing it all at once. Our current firewall is setup at 10.30.1.2 and this is the default route on our L3 switch (0.0.0.0 0.0.0.0 10.30.1.2). So my question is, if I setup an inbound NAT to one of our web servers on the 10.10.96.x subnet, will I be able to get it to route back to the ASA as opposed to ending up in asymmetric routing **** since the default route points back to our other firewall?
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Dec 18, 2012
I have the syntax correct and thought process down right on a solution to allowing guest wireless users access to an internal webserver. (DMZ discussion aside)
We have an ASA5510 with interfaces setup as:
outside - 65.x.x.x address
inside - 172.20.1.2
guest_inet - 10.2.1.1
Internally clients resolve our website to 192.168.40.40 and that part works as it should. Clients outside of our network resolve our website to the correct external address (lets just call it 1.1.1.1). We have a NAT statement static (inside, outside) 1.1.1.1 192.168.40.40 netmask 255.255.255.255 and an ACL to permit tcp any host 1.1.1.1 eq www
Clients on our guest_int use an external DNS server and hence resolve our website to 1.1.1.1. However it seems traffic goes out and back in our outside interface and this connection never occurs.
What I'm wondering is the correct NAT statement / ACL to add that would allow our internal clients on the 10.2.1.x network to access our internal website. Would that be: static (inside,guest_inet) 1.1.1.1 192.168.40.40 netmask 255.255.255.255 ? Since there is already an ACL permitting port 80 traffic to 1.1.1.1 we should be taken care of on the ACL side of things, right?
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May 19, 2012
We have a site with two inbound circuits, one for internet and one for our MPLS. Each circuit is being terminated by a 2921 Router and matching ASA 5510 Firewall. For the internal network, the Internet ASA's inside interface (172.16.0.1) is the default gateway for all hosts. OSPF is the routing protocol between all the routers and ASA's and routing is working. In fact, ICMP is working as well. From an inside host (172.16.0.81), we can ping anything on the MPLS network. But when I try to use telnet (for example), the connection fails. If I add a route to 10.10.10.0 to the host, or re-configure the host to point to the MPLS ASA (172.16.0.254) as it's default gateway, connections will establish.
Both ASAs are running 8.4(3), and have the following commands:
same-security-traffic permit intra-interface
interface Ethernet0/0
nameif outside
[Code]....
And from the MPLS nodes, I can see a tcp request is made.
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Jun 3, 2012
I have an ASA5510 running version 8.2(5) I am having an issue with routing/natting from an internal network to the outside interface IP on port 443 which has a nat back in to another internal address. i works externally in from a public address. i also see log messages to do with IP Spoofing
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Dec 14, 2012
We just changed ISPs and now have a /29 routed subnet to be used on our ASA 5510 (8.4) instead of the one public ip we had before.There are a couple of PAT translations that were previously setup on the "interface" address which i now want to assign to a different ip address further in my subnet.
So i just changed this:
object network BMMM
nat (inside,outside) static interface service tcp smtp smtp
to:
object network BMMM
nat (inside,outside) static other.external.ip.in.subnet service tcp smtp smtp
And assumed that this would work,y it does not, and this leaves me unable to contact that machine from the outside.And shoud i also change my access-list?The relevant access-list rule is:access-list outside_in extended permit tcp any object BMMM eq smtp
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Jun 11, 2013
I've been following most of the comments in regarding how to allow communication between two internal networks on a ASA5510 8.2.5 But I am still a little confused about to how to set my firewall. I made chages to it and still do not have the desired results.
I need to allow comunication between Interface 0/1 and Interface 0/2. See configuration file with fake or dummy ip address below.
ASA Version 8.2(5)
!
hostname ciscoasa
domain-name lxx.com
[Code].....
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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 4, 2013
I have inherited an asa 5510 whit 4GE SSM module installed. The asa runs fine, but i can not use the 4GE SSM ports. Using ASDM or console i can get and configure the gigabitethernet1/x ports but i can not get traffic on it. The ping from the console to the ip address of the Gigabitethernet1/0 is successful. On switches or hubs connected to those ports i can not see the port's mac address. The two Internal-data0/0 and Internal-data1/0 are down and i can get they up. How to configure 4GE SSM or ASA internal-data ports.
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Apr 22, 2012
I am tasked with transferring all clients from one subnet to the other. I figure the nicest way to do this is to temporarily have the subnets talk to each other in an endeavour to avoid as much downtime as possible. The two internal subnets are:
192.168.0.0/24
192.168.43.0/24 (the intended migration network)
I am beating my head against the desk here as I dont seem to be getting anywhere after the changes I have made. The current configuration is as such:
ASA Version 8.2(5)
!
hostname ciscoasa
domain-name *****
enable password ***** encrypted
passwd ***** encrypted
names
[code]......
Upgrading the firmware is not really an option?
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Sep 25, 2012
I was just wondering if it's possible with an ASA 5510 to connect to the external IP address of an internal server from inside the network. I have already set up dns doctoring for dns lookups, and everything is working fine there. We have an application inside the network that tries to connect straight to the external Ip of another internal server. where to look in the ASDM 6.4?
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Feb 20, 2012
I am working on replacing our Checkpoint Firewalls with ASA's, and am running into the following NAT problem. On some of our Checkpoints, there are external NAT's that are mapped to multiple internal hosts based on ports.Is there any way to translate that to the ASA? I'm not sure the ASA will let you have multiple internal hosts mapped to one external IP using static NATs. The main issue, is these are alarm panels that receive data from external hosts (the traffic is initiated externally on the Internet) so I can't use dynamic PAT with this.
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Dec 5, 2012
Since the power failure two days ago, my -ASA stops forwarding traffic to internal servers, for no apparent reason. Packet trace shows all OK, packet capture buffer stays empty when I try to http into the mail server. The only way to get it working is to change the Outside Ip to the one used for mail, then to change it back. It will work OK for a few hours, then stop, with nothing obvious in the logs.
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Feb 21, 2013
I have a Cisco ASA 5505 (version above) and I have someone that needs to SSH into a box behind the ASA. I'm having a few issues trying to configure this access-list and NAT. I've tried many combinations and clearly my IOS is not as good as I thought. What commands should I enter to accomplish mapping SSH from an outside network range to an internal host ?
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Jan 25, 2012
I now need to configure an ASA 5505 for a small server farm. It's fairly straightforward:isp -> asa5505 -> internal servers,'m using static addresses -- no DHCP involved.VPN works; I can get into the internal network.pinging from the ASA to an external address works,However, I cannot get from a laptop connected to an internal port out to the internet, either using ping or typing an address in the browser.
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Dec 19, 2011
I am implementing a guest wireless network to work alongside my internal network. The guest network will use the existing switching network and will be separated by VLANs. I have the ASA set so that traffic can get to it and out to the Internet. I can set up a workstation on the same VLAN as my guest network and can route inside my network (strictly doing this for testing purposes). Where I am having problems is with the Catalyst 4506 switches and the ip routing. I had two separate "ip route" statements defined on my switches.
ip route 10.200.2.0 255.255.255.0 10.200.2.254
ip route 0.0.0.0 0.0.0.0 10.100.100.254
I have discovered that the traffic is always following the default route despite the fact that my IP address on my test workstation falls in the 10.200.2.x network. I was looking at documentation and found that it is possible to set up policy-based routing on the core switches. Can you have two "ip route" statements defined like this to segreate traffic or do I have to use PBR for routing (or a combination) in this case? If I define PBR then how does that impact my existing routing? I need to make sure that I can still route the existing traffic while I'm configuring this change.
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Aug 1, 2012
After connecting via anyconnect client 2.5, I cannot access my internal network or internet. My Host is getting ip address of 10.2.2.1/24 & gw:10.2.2.2
Following is the config
ASA Version 8.2(5)
!
names
name 172.16.1.200 EOCVLAN198 description EOC VLAN 198
dns-guard
!
interface Ethernet0/0
description to EOCATT7200-G0/2
switchport access vlan 2
[code]....
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Aug 23, 2011
I am using ASA 5520 with 8.2.4 IOS. I'm new to ASA/Firewall. I need to do access webserver from outside network.From Laptop (192.168.2.51), If I connect to url... it should open page from 10.10.10.50.I also need to ssh to webserver from laptop. If I ssh to 192.168.2.50 from laptop, it should connect to 10. 10. 10.50. [code]I can't get to webserver from outside network, so now, I connected laptop to directly ASA 5520 outside port with crossover cable.ASA Inside port connects to L3 switch. Webserver also connects to L3 switch. But still doesn't work.
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Jan 15, 2012
Cisco ASA 5505 Cannot Ping Secondary Internal Network.
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Oct 27, 2011
For a customer I have configured a new ASA 5505 firewall with 8.42 software. I had to build 3 ipsec tunnels to different locations and firewalls. All tunnels are working except one. I have to translate the inside network 1 to 1 to a different private range before it is sent over the tunnel. Each host from network 192.168.133.0 /24 has to be translated to a 192.168.112.0 /24 host and then sent over the tunnel. (e.g. 192.168.133.22 translated to 192.168.112.22)
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Feb 18, 2013
I am new to Cisco ASA and have been configuring my new firewall but one thing have been bothering. I cannot get internal networks and routing between them to work as I would like to. Goal is to set four networks and control access with ACL:s between those.
1. Outside
2. DMZ
3. ServerNet1
4. Inside
ASA version is 9.1 and i have been reading on two different ways on handling IP routing with this. NAT Exempt and not configuring NAT at all and letting normal IP routing to handle internal networks. No matter how I configure, with or without NAT I cannot get access from inside network to DMZ or from ServerNet1 to DMZ. Strange thing is that I can access services from DMZ to Inside and ServerNet1 if access list allows it. For instance DNS server is on Inside network and DMZ works great using it. [code]
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Jan 10, 2013
we have a Cisco 2901 as a router on a stick for several vlans. Everything on the segment routes fine and accesses the internet just as they should. The 2901 connects to an ASA5505 on port 0/1. Any host connected to the ASA5505 can access the internet, but can not ping into any of the vlans off of the 2901. The strange thing is on either segement of the network I can ping all of the gateways. What is even more strange is when I run wireshark from behind the firewall going into the 2901 I can not see the packet on another wireshark instance behind the 2901. However if I start a ping for a host host behind the asa I can see the packet in wireshark on the host, which I am trying to ping, hit the gateway.
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Aug 23, 2012
I have configured an ASA 5505 to connect a single internal network to internet, it is not working. I have attached the config
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May 8, 2013
What is the best way to monitor an Internet Edge router from the Internal network behind the Firewall?We want to pull more information from the edge router like netflow. We can use SNMPv3 and ACLs to keep the router secure.
But I am looking for the best config to keep both the router and firewall as secure as possible while still allowing us to monitor performance and faults.I am running an ASA and a 2821.
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Sep 10, 2012
I have a 5505 between a vendor router & my company network, vendor is not able to access devices on internal network. I am also not able to access the firewall via asdm
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May 21, 2012
I am using a 6500 with FWSM. I need to separate an internal server/HQ network from 3 or 4 different external connections. The external networks do not necessarily need to be isolated from each other.I have the option of using a 3 layer model: L2 Access layer to SVIs on the Distribution layer and then L3 to the 6500.L2 Access, connecting directly to the 6500s, with the SVIs on the FWSM.Is it better to have the FWSM outside the MSFC or Inside? Am i correct in thinking that "inside" vs "outside" is determined by whether the SVI's are configured on the FWSM or the MSFC? is there any performance impact from having the FWSM doing the routing instead of the MSFC.If the vlans are all configured on the FWSM, what is the 6500 doing, other than providing switch ports?
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Mar 17, 2013
I have created a VPN connection for ASA 5512-X by using the wizards and nothing seems to be wrong on the wizards's config.I am able to connect to the network by using the VPN but unable to ping internal network.Below is my config for your reference:
Result of the command: "sh run"
: Saved
:
ASA Version 8.6(1)2
!
hostname FAA-ASA-1
enable password crzcsirI44h2BHoz encrypted
passwd 2KFQnbNIdI.2KYOU encrypted
[code].....
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Jan 23, 2012
We have a Cisco wireless infrastructure in place that includes a guest network with its own subnet that is a sub interface of the inside interface on our ASA 5520. There are no routes for it to be allowed access to the internal subnets. So it can only access the internet. This is primarily used by the public, but we have several non employee personnel that we only want to give internet access and force them to access the internal network through our clientless SSL vpn portal or through other internet facing internal resources such as webmail.I have done packet traces from within the ASA and the break appears to be there is no ACL allowing the traffic back into the network once the web resource replies to the request and the traffic is attempting to come back into the network from the web resource. Is that as clear as mud?
I know that this has to be a common problem and a way around this is to allow the guest wireless network access to the internal network but only for the select resources that they require. And that this can be done seemlessly by network specific routes and or alternate DNS entries, but I would like to keep this simple and just allow them to access the web resource, webmail and VPN, from the guest wireless using internet DNS servers without route trickery.
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Oct 10, 2012
I'm able to build my tunnel but unable to RDP nor ICMP back to the internal network.
VPN Client IP: 192.168.200.200
INTERNAL IP: 172.17.130.200
my configuration is below:
HOME-ASAFW02(config)# wr t: Saved:ASA Version 8.4(4)!hostname HOME-ASAFW02domain-name hsd1.nj.comcast.netenable password ViPq56cvd3SGvB08 encryptedpasswd 8bcozHCAwCqA5BmN encryptednames!interface Ethernet0/0description OUTSIDE-Connectionswitchport access vlan 2switchport protected!interface Ethernet0/1description INSIDE-Connectionswitchport protectedspeed 100duplex full!interface Ethernet0/2description WiFi-LinkSYSswitchport access vlan 3switchport protected!interface Ethernet0/3shutdown!interface Ethernet0/4shutdown!interface Ethernet0/5shutdown!interface Ethernet0/6shutdown!interface Ethernet0/7shutdown!interface Vlan1description INTERNAL-Networknameif insidesecurity-level 100ip address 172.17.130.129 255.255.255.128!interface Vlan2description OUTSIDE-Link-to-ISPnameif
[code]....
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Feb 20, 2012
Is possible to configure a chassis internal network (CIN) with Cisco CBS3110G switches in an IBM BladeCenter?
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Dec 19, 2011
I have an ASA 5505 configured with internal network, a DMZ, and a VPN on seperate subnets. The implicit rules allow my internal client computers to connect to the web servers on the DMZ IP, but I can not connect to the public NAT address from the internal network. I have a DNS server on my internal network and it does resolve to the public IP correctly. NAT seems to be working correctly because if I go outside the network and connect to the public IP or qualified name then I can get to everything correctly. I do not see any messages in the Cisco logs and the packet trace tool shows the route of http from an internal IP adddress to the external (NATed) address is allowed.
Specifically, I can go to http://192.168.1.121 from the internal (192.168.0/24) network, but I can not go to http://72.22.214.121 (the NAT address) from the internal network. If I am outside my cisco then I can go to http://72.22.214.121 easily. [code]
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