Cisco Firewall :: ASA 5505 - Nat Internal Network Before Sending Over Tunnel
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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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 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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Jan 15, 2012
Cisco ASA 5505 Cannot Ping Secondary Internal Network.
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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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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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Oct 14, 2012
I will be configuring port forwarding to a phone system on the network for remote management. I would like to have the ASA send an email alert when a connection has been made to the open port. Is this possible to do and if so how to configure it.
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Nov 20, 2011
I want to have my port 4 on the asa 5505 only allow access to the internet and not the internal network, what do i need to do?
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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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Apr 3, 2013
I am having some trouble accessing some backup Email (Outlook Web Access) and Citrix servers located behind an ASA 5505 firewall at a remote datacentre. Simply put, when I go to the specific URL (e.g. [URL]) I do not arrive at the splash page, I just get a message saying that the server took too long to respond in the web browser. I'm wondering whether I have missed something on the configuration or the firewall itself is not letting my requests through. The remote servers are located at a remote Disaster Recovery site and use the subnet 192.168.4.0/24. I am at head office which is connected to the DR site via a VPN using 192.168.1.0/24.
[Code] .....
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Jan 12, 2011
I have a client in a workgroup environment. They are a small company with perhaps twenty systems. Their infrastructure consists of a Dell Switch, a Cisco ASA-5505 which hands out the DHCP and a router. And that's that.They have been using an external IP as their DNS Server to get out to the Web. However, they now want to add an internal Linux-based DNS server.In looking through the ASA-5505 today I noticed a field for DNS enteries. Is this where the IP for this new internal DNS Server (in the secondary DNS field) would go?If so, would it be necessary to reboot the ASA-5505 for this change to take effect?
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Nov 7, 2012
We recently changed locations and acquired a new circuit from our provider. They also connected our remote branch office to our main office through MPLS. Now, as I understand it, the branch office basically connects back to the main office through our providers network (MPLS). We have a new router at the branch office which has a gateway of 192.168.1.225. The clients in that office have IP's of 192.168.1.96 - 100, using the gateway of 192.168.1.225.
The main office network is 192.168.0.0 (Gateway of 192.168.0.1)
At this end (Main office), I also have a new Cisco 2900 provided by the ISP, with port 0/0 for the outside connection (connected to the 0 port on my ASA 5505). The ASA's port 1 obviously running into my network hub. The provider tells me that port 0/1 on the 2900 is or should be used to connect the branch office back to here and has an IP of 192.168.0.225, as that's how the provider provisioned it. So, I plug that into the ASA's Ethernet port 0/2. And I'm assuming they have a route setup either on the 2900 or the router in the branch office so that 192.168.1.225 can reach me here at 192.168.0.0.
There is already a static route setup on the ASA: (192.168.1.0 255.255.255.255 192.168.0.225 1). As soon as I plug in the cable, the IP phones at the branch office work, but they can't access the internet or any resources in the main office. My questions are:
1. Shouldn't I be able to just go straight from the 0/1 port on the Cisco 2900 to my hub. At first I was plugging right into the ASA, but I don't think I need to do that, why go from the branch office through my ASA to access resources and then back out the ASA for internet. If they're already coming from 192.168.1.225, through the MPLS network, then they should go right to my network and then back out the ASA.
2. They have to route through the ASA first, in which case, do I need to setup another VLAN for that branch network in conjunction with a static route? I can ping the router and hosts in the branch office through the ASA only!
Below is the running sanitized config:
Result of the command: "show running-config"
: Saved:ASA Version 8.2(2) !hostname ciscoasadomain-name audiology.orgenable password ulzaQiFnKVzDwUmW encryptedpasswd 2KFQnbNIdI.2KYOU encryptednames!interface Vlan1nameif insidesecurity-level 100ip address 192.168.0.1 255.255.255.0 ospf cost 10!interface Vlan2nameif outsidesecurity-level 0ip address 1.2.3.4 255.255.255.240 ospf cost 10!interface Ethernet0/0switchport access vlan 2!interface Ethernet0/1!interface Ethernet0/2!interface Ethernet0/3!interface Ethernet0/4!interface Ethernet0/5!interface Ethernet0/6!interface Ethernet0/7!boot system disk0:/asa822-k8.binftp mode passiveclock timezone EST -5clock summer-time EDT recurringdns server-group DefaultDNSdomain-name audiology.orgsame-security-traffic permit inter-interfacesame-security-traffic permit intra-interfaceaccess-list
[code]....
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Aug 2, 2011
I tried the solution posted at [URL] however it did not work on my ASA5505 8.4(2). I thought that it may be because I only have a single public address so the web server is responding to port forwarding through the one public IP already. looking in ASDM it appears to indicate that a configured access list is blocking the server from responding to the internal hosts.
object network Private_IP
host 192.168.1.15
object network Public_IP
host 1.1.1.1
object-group network internal_net
[code]....
Can I fix an access list (or something) to make this work or am I wishing for too much with only one public IP? This worked by default on my Netgear firewall.
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Jun 4, 2012
I have a Cisco 5505, 2 sites that are internal, 1 external IP (dhcp from cable modem). While on my laptop, ipad, iphone, I cannot access the server via it's external IP address. I MUST use the internal IP in order to access this site. I have heard of hairpinning, internal dns server(don't really want this).
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May 30, 2013
I have an old ASA 5505, and I'm having some trouble with Nat Hairpinning. I've done this with other firewalls before and I am having no luck now. I have an internal address that I wish to forward from an external address- so if someone goes to 123.456.789.012:3456 then it will forward to 192.168.1.244:92 (All numbers are arbitrary here- only for illustration). I have and Access Rule and NAT and PAT set up so that I can get in if I originate from outside the LAN. What I am trying to do is to have this work from inside the LAN as well- so that if I am at my desk, and I connect a device and type in 123.456.789.012:3456, it will deliver the content at 192.168.1.244:92. The problem I am having is that it just isn't working, and I cannot figure out why- When I started here, there was an address configured to work this way, and it still works- I just cannot find what is different between what I am doing and what the person who configured it did.
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Aug 30, 2011
I'm usually not working with this product, but this is what I'm trying to do.I have 2 internal networks setup on our Cisco ASA 5505 firewall. (not done by me, I'm a new to this product)I'm trying to access a server on one network from a PC located on the other internal network. (preferable through the web gui)When I try "Packet Tracer" from interface "Trust4" it fails on the NAT phase.(Source ip: 10.0.4.99, Destination ip: 10.0.6.99)
When I check the NAT rule, it says:
Type Source Interface AddressDynamic any outside outside.
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Mar 24, 2013
I'm completely illiterate with Cisco appliances but I'm taking care of an ASA 5505 that is configured as a firewall and it has been working for the last years. All of the sudden we are experiencing intermittent connection problems from the workstations. You can be browsing the internet and suddently you'll get a server not found error but you refresh it and it works. This is also intermittent, out no apparent reason it will start working normally again.
I am seeing a bunch of errors like this in the logs:
4 Mar 25 2013 14:34:49 106023 66.235.119.5 69.70.15.61 Deny icmp src outside:66.235.119.5 dst inside:69.70.15.61 (type 8, code 0) by access-group "inbound" [0x0, 0x0]
[Code].....
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Oct 27, 2011
I have a server that I need to open up some ports on to allow access to the new internal Sharepoint server we're setting up. I've been having some issues getting the ports open like once I put the commands in and save them that server suddenly stops allowing outbound traffic. After looking at a few things I noticed while I was looking at the config file that the ASDM location is showing 2 IP's, both are the same as the server I'm trying to open ports for one being the private IP and the other is the public IP I'm trying to use. Is this the reason I'm having problems when I try to open those ports to my server? Do I need to use both a different private and public IP for this server so I can get my ports to work? The programmers selected these IP's so if I need to change them I'll let them know in case they need to make changes for the Sharepoint setup. This is on an ASA 5505.
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Nov 11, 2012
I have the connection working with my ASA 5505 but cannot ping the internal network. (Note external interface is getting the IP via DHCP)
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May 25, 2011
I have an ASA 5505 with the security plus software and I'm trying to find out how to assign 2 public IPs to the outside interface and have each IP routed to a separate internal VLAN. For example, IP 1 = X.X.X.1 routed to 192.168.1.0 and IP 2 X.X.X.2 routed to 192.168.2.0. I was told this was possible and I've been trying to find configuration examples, but I can't seem to get anywhere and now I'm getting desperate because I'm scheduled to install it this weekend.
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Dec 23, 2011
Currently I have an ASA setup as a Firewall with 1 outside interface and 2 inside interfaces. Initially, the Guest interface was setup to receive DHCP from the ASA and everything was working. I'm adding router and a server for the guest interface and what I'm trying to accomplish now is the following: ASA 5505 > Airport Extreme with a public static IP (69.xx.xx.6), handling DHCP and NAT > Mac Server as DNS Server.Right now, when I connect to my Airport Extreme with any computer, I don't have internet. I don't understand what's wrong. My DNS Server has a reserved IP address: 192.168.226.2 and it's pointing to itself and forwarding the ISP DNS servers, the Airport Extreme is handling the DNS Server IP and the ISP DNS Server IP but I can't connect to the internet from the server. [code]
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Mar 22, 2012
We have an ASA 5505 running version 8.4. We are having problems allowing external traffic to access computers behind the firewall. Our current config is:
ASA Version 8.4(3)!hostname ciscoasadomain-name default.domain.invalidnames!interface Ethernet0/0switchport access vlan 2!interface Ethernet0/1!interface Ethernet0/2!interface Ethernet0/3!interface Ethernet0/4!interface Ethernet0/5!interface Ethernet0/6!interface Ethernet0/7!interface Vlan1nameif insidesecurity-level 100ip address 10.2.1.1 255.255.255.0!interface Vlan2nameif outsidesecurity-level 0ip address 152.18.75.132 255.255.255.240!boot system disk0:/asa843-k8.binftp mode passivedns server-group DefaultDNSdomain-name default.domain.invalidobject network a-152.18.75.133host 152.18.75.133object network a-10.2.1.2host 10.2.1.2object-group network ext-serversnetwork-object host 142.21.53.249network-object host 142.21.53.251network-object host 142.21.53.195object-group network ecomm_serversnetwork-object
[code]....
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Apr 4, 2013
How to best troubleshoot some errors I'm seeing on the internal interfaces of my ASA 5505. This is similar to the question at [URL], but the details are different enough that I felt it justified a new discussion.
I have an ASA 5505, running version 8.2(2), 256MB RAM. From time to time (on the order of once a week) our monitoring alerts us that both Internal-Data0/0 and Internal-Data0/1 are experiencing an unusual amount of inbound packets which were discarded with errors, up to 2.3 per second as of this post. Here is what I hope relevant output from my device:
asa# show interface ip brief
Interface IP-Address OK? Method Status Protocol
Internal-Data0/0 unassigned YES unset up up
Internal-Data0/1 unassigned YES unset up up
Vlan1 10.x.x.x YES CONFIG up up
Vlan2 32.32.32.32 YES CONFIG up up
[code]....
1. My understanding is that Internal-Data0/0 is an internal bus that connects to modules like the 4GE. I don't have any modules installed at all, as you can tell. Therefore, what is this bus doing?
2. For that matter, what is Internal-Data0/1 doing? What does it connect to?
3. I'm guessing that due to the input errors and overruns reported for both of these interfaces, it's a buffering issue. Since these are input errors, does this mean that traffic destined to this bus for forwarding is being dropped because the bus itself is running out of buffer memory? How would I see (and subsequently monitor) the buffer memory for these interfaces? Once I am able to see it, what sort of tools can I use to determine what is causing this?
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Jun 29, 2011
I have just installed a new 887 in a branch office. Two GRE tunnels are configured back to our two head office routers. Only one of the tunnels is able to send EIGRP hellos successfully and hence, one tunnel adjacency is flapping after the RTO is maxed. Ive tried a few things but I'm totally at a loss now. I can see from debug eigrp packets that the hello is en queued and that Hellos are received from the tunnel endpoint, but the ACK is generated and queued also. There are no access lists or nat enabled on the tunnel interface and no outbound acls in place. General NAT/PAT is set for the Dialer int. Ive removed all crypto and any QOS although I don't think these would affect this anyway. Bear in mind that both tunnels originate at the Dialer and one is working fine.
The SH ip eigrp neigh is shown here
EIGRP-IPv4 Neighbors for AS(****)
H Address Interface Hold Up time SRTT RTO Q Seq
(sec) (ms) Cnt Num
1 172.20.80.1 Tu0 10 00:00:13 83 5000 1 1784719
0 172.21.80.1 Tu1 13 2d21h 79 474 0 1437249
At this point Im starting to think it could be an ISP issue?
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Feb 6, 2011
I'm new to this cisco 5505 and I want to carry out a task as simple as a remote access VPN, in my case I did the wizard, with time on my test, I could connect to the VPN, but I can not ping any device internal network. [code]
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Apr 9, 2012
What I got is a 5505 ASA firewall and I'm connected to it via VPN. I'm pulling an 192.168.169.x address because that's what we set their company's internet LAN to. Which is what we want. What I can't do while I'm VPN'd in is ping from the internet network to the DMZ, and the same when I try and ping from the DMZ to the internal network.
The DMZ is on a 196.0.0.x network.The internet network is 192.168.169.x network.
I don't need them to have internet access on the DMZ I just want to be able to access it from the internal network. What is going on is we need them to be able to VPN into the DMZ and access their equipment. At this point it would just make me happy to be able to ping from the internal network to the DMZ and I can figure it out from there I've setup rules and applied them and when I wasn't having success I referred back to defaults. Right now the rules are set at default, any thing in and anything out, on both internal and DMZ. I'm using a VPN client and going through Cisco ASDM Launcher to setup the rules and static routes, I haven't done anything with the command line. All the research I've done everyone does it command line, I find it easier to do it GUI. This is my first time working with an ASA firewall.
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Apr 23, 2012
I have an ASA 5505 with the base license,When I setup the DMZ interface I had to add the deny access to the inside VLAN. The DMZ works fine with WiFi on it, but user's iPhones can't get email unless they turn WiFi off.Is there a simple way to allow HTTPS traffic through the DMZ interface to our internal Exchange server which is NAT'd on the 5505's external IP?
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Sep 12, 2011
I have configure Cisco 5505 as layer 2 firewall mode. I have vendor machine connected to Cisco ASA 5505 on port 2 as VLAN2 inside then VLAN1 outside connected to my internal network on layer 2 cisco 2960 switch. This machine needs access only to LOGMEIN then block all internal/internet traffic.
vendor machine on vlan 2 inside >> Cisco ASA 5505 vlan1 outside >> layer2 switch >> internal LAN >> Cisco 5520 main FW >>> INTERNET
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Oct 25, 2012
Having a strange issue with RDP to a XP machine through a L2L tunnel.Tunnel is between an ASA5505 and ASA5510. Site A 5510, Site B 5505 I have a handful of Win7 and XP Dev machines running on ESXi 4.1 within Site A.Site B to Site A I can RDP to all Server 2008 and W7 machines(physical and virtual).I can also RDP to a physical XP machine.I can ping the XP VMs by name and IP successfully.I cannot RDP to the 5 XP VMs running on the ESXi 4.1 host Site A to Site B I can RDP from the XP VMs on the ESXi 4.1 host to any machine within Site B.Within Site A I can RDP to these XP VMs AnyConnect I can AnyConnect into Site A and RDP to the XP VMs I have tried to Telnet on 3389 to the XP VMs with no success.
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May 17, 2013
I have a ASA 5505, which has two IPSec RA tunnels build, for each one the user is able to authenticate and get an IP address is the designated IP pool, but they are not able to ping the Firewall, or RDP to any internal servers. Here is a copy of the running config:
: Saved
:
ASA Version 7.2(2)
!
hostname ciscoasa(code)
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Mar 27, 2008
I am trying to monitor my ASA 5505. This asa is connect via a ip-sec tunnel to our network. I have no problems with snmp monitoring devices behind the ASA, but when trying to monitor the asa itself I do not get a SNMP response.
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Mar 21, 2012
I'm trying to establish a VPN tunnel between our main office running a Cisco ASA 5505 [8.3(2)] and a remote user using a Cisco Small Business WRVS4400N firmware version V2.0.1.3.
The Cisco ASA 5505 is already configured to allow incoming IPSec VPN connections via the Cisco VPN Client.
Is this possible, and if so, how would I go about doing so? The remote user has a static IP address as well as the main office.
I'm trying to establish a VPN tunnel between our main office running a Cisco ASA 5505 [8.3(2)] and a remote user using a Cisco Small Business WRVS4400N firmware version V2.0.1.3.
The Cisco ASA 5505 is already configured to allow incoming IPSec VPN connections via the Cisco VPN Client. Is this possible, and if so, how would I go about doing so? The remote user has a static IP address as well as the main office.
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