Cisco Firewall :: ASA 5505 Allowing Traffic Between Two Internal Networks
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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May 22, 2011
I have 3 networks coming on DMZ (VPN) interface. Only one network is able to ping the DMZ interface. See below networks coming i on the DMZ.
10.132.24.0/2410.132.25.0/2410.132.26.0/24 Only the 10.132.26.0/24 netork works as it is in the same range as the DMZ interface.
allowing the other two networks to communicate. I've attched the diagram and configs for your perusal.
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Mar 15, 2012
I am trying to switch out a cisco pix 501 firewall with a cisco ASA 5505 firewall. I am not very familiar with all of the commands for the firewalls and have always relied on a standard command line script that I use when building a new one. Unfortunately, my script is not working with the 5505. What I am doing wrong with the following script? I've masked public IP info with xxx.xxx.xxx and I run it right after restoring the firewall to the factory defaults. I am able to get out to the internet if I browse directly from one of the servers, but cannot access a web page when trying to browse to it from an outside network. [code]
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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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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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Mar 10, 2013
I have a nac guest server 3315 appliance with 4 NICs. I want to connect each NIC to 4 different networks without allowing traffic between them. So RADIUS interface will be different from sponsor/admin interface to the NGS. how to achieve this. I have created and assigned a static IP address using system-config-network, but when i do ifconfig i dont see the remaining 3 NICs and the web interface doesnt seem to have provision to create this interfaces.
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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 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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Jan 17, 2013
A customer has a ASA 5505 with a remote access vpn. They are moving their internal network to a new scheme and would like users who come in on the vpn to access both the exisiting and new networks. Currently the can only access the exisiting. WHen users connect to the remote access vpn, the asa gives them an address of 192.168.199.x. The current internal network is 200.190.1.x and they would like to reach their new network of 10.120.110.x.
Below is the config:
:
ASA Version 8.2(5)
!
hostname ciscoasa
[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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May 15, 2012
Let me start by saying that I'm just starting to study for CCNA, so the ASA seems to be a bit above me yet. The ASA's we are using is for VPN to our corporate office and only allowing access to our Citrix environment, so no direct internet allowed. We have a person who works in the remote office who has need for a caption telephone that requires direct access to the internet. The phone only supports DHCP, and getting the ASA to do an ARP reservations is proving difficult. For now I wrote an access list to allow it's DHCP address out but it still isn't working. The access list I wrote is:
access-list 101 extended permit ip host xxx.xxx.xxx.124 any log
access-list 101 extended permit ip any any
access-group 101 out interface outside
When I do a show access-list I'm seeing that traffic is hitting the access list as the hit counter has increased. When I do a show conn I'm seeing one of the IP's that the phone should have access to, however the flags are: saA, so I'm assuming they are not getting a response. According to the manufacturer, only outbound connections are needed, no incoming ports required. All traffic is TCP.
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Mar 1, 2011
I ' m not able to configure the asa 5510 to allow the multicast traffic to pass through ASA.The multicast traffic have to pass from inside interface to outside interface.Can I configure the multicast traffic to pass through asa with a static nat ?
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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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Oct 2, 2011
We have Cisco ASA 5505, 90.x.y.2/29 IP is assigned to outside interface. We have one internal HTTP server so that I use static (inside,outside) tcp interface [URL] to forward all incoming HTTP traffic to internal HTTP server 1. Now we need to add new physical HTTP server 2 so that I would like to forward
HTTP traffic to e.g. 90.x.y.3/29 to 172.16.0.11.
How can I do that? See scenario image (scenario.png) if needed.
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Apr 24, 2012
I have a computer behind the ASA 5505 firewall. The computer needs to access Microsoft Activation Server. Reading some website information, I need to allow a huge list of servers that basically points to www and https traffic. Therefore, looking at this heavy requirements, I prefer to allow this computer to navigate to any https or http (www) server outside of the firewall.I have included my current asa 5505 configuration. [code]
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Apr 26, 2011
We recently got a Cisco ASA 5510 Security Appliance and I have some general question.
We have 1 T1 internet connection, and we have 2 internal networks. These 2 internal networks currently hav access to the internet. I am having issues with the 2 internal networks being able to communicate with each other.
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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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Jul 29, 2011
i have reviewed this configuration a couple of times and I am not seeing my error. I have two internal subnets, in different VLANs with the ASA being the default router. The internal zone works fine, but the zone called wireless on VLAN 13 doesn't. The firewall blocks all communications and the rules look correct to me. I want all traffic on this wireless subnet to be allowed to cross over the firewall and NAT to the outside interface, just as the inside zone does.
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Oct 25, 2012
I have a cisco ASA5505, it runs a wide site to site VPN network and has 4 servers connected to it
10.50.15.4 > fileserver
10.50.15.5 > domain controller (exchange)
10.50.15.6 > terminal server
10.50.15.7 > terminal server
Now yesterday i removed 10.50.15.6 and replaced it with a new terminal server with the same ip address, ever since the ASA is blocking traffic between it and the domain controller (example)
2Oct 27 201214:51:0510600710.50.15.655978DNSDeny inbound UDP from 10.50.15.6/55978 to 10.50.15.5/53 due to DNS Query What has me baffled is the only thing different between today and yesterday is the new server is windows server 2008 and the old one was windows server 2003. The new server has the same LAN ip address as the old one to make the changeover seamless for the users.
why all the sudden my ASA has decided to block the traffic between those machines? all the other machines can talk to it fine just not the domain controller, and seeing that this is a terminal server naturally you can see the problem i face!
this router has worked flawlessly for 2 years now without any config changes and i cant work out why its blocking traffic between those 2 machines.
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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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Nov 26, 2011
I am new to the ASA series and I am at a complete loss as to why I cannot configure this router to forward SMTP and RDP traffic to an internal host.
The packet trace tool in ASDM shows complete end-to-end connectivity for RDP but it still fails to connect from outside. This is my config file, what I need to change in order to make it work?
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Feb 13, 2011
I am using ASA5510 and i want to know if it is possible to redirect http traffic to an internal proxy software. I explain : PC from the LAN use a internal proxy in their IE browser but some other PC doesn't use it.They are directy connected to the Internet using the Public IP from the WAN interface ( via NAT). Can we redirected this HTTP Traffic from the WAN interface to the Proxy in the LAN ?
Http Traffic will be routed like that : PC -> WAN interface -> Proxy -> WAN interface -> Internet In fact,can we create a rule saying : All http traffic which doesn"t come from the IP Proxy must be redirected toward proxy.
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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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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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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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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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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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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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Jan 15, 2012
Cisco ASA 5505 Cannot Ping Secondary Internal Network.
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