Cisco Firewall :: ASA 5505 Internet Access Best Practices?
Oct 10, 2012
i am looking for the best practices when using a Cisco ASA 5505 to provide NAT and protect my inside network from the outside.
I have the inside security level set to 100 and the outside set to 0, want other features can be used to protect the network from the Internet, am assuming that the security levels will ensure no traffic comes from the outside to the inside unless there is a rule that allows it.
Would any firewall policies be required to increase the level of security?
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Jan 10, 2012
What are considered the best practices for monitoring ASA's--specifically the 5510 with Sec+ License.
My current monitoring application keeps reporting issues with outbound interface buffers being too high, but there are not any performance issues and I believe the thresholds are just set absurdly low.
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Sep 27, 2012
I have config ASA 5505 and it is conencted to layer 3 switch that connects to cable Modem.
ASA is config with DHCP option and PC is able to get the IP from ASA. But from PC i am unable to access the internet. From ASA itself i am able to ping the Websites fine.
ASA has config with DHCP for inside and also it is doing NAT.
When i connect the ASA directly to Cable modem then pc is able to access the internet.
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Jul 5, 2011
I would like to restrict Internet traffic (HTTP & HTTPS) for Inside Users with an ASA 5505. I would like to setup a proxy-like system where a User/Password must be entered before the User can actually browse the web.
I know that this can be done with an additional RADIUS/TACACS+ Server. Is this also possible without any external AAA Server, so with User/PW stored on the ASA locally only?
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Jul 20, 2011
I have configured the ASA 5505 for internet access and outside users to use two servers in the DMZ. Every thing is working fine. When I was configure VPN, I did some mistake I guess, now inside users are not able to access internet. They get an error 405. Thats an error. The request method XXX is inappropriate for the URL /. Thats all we know. Even I am not able to access the server in the DMZ from outside and I get an error : Bad Request - Invalid HeaderThese things just happend after I did some thing on the ASA. I copy and pasted the my old configuration but still insider users are not able to connect to internet and from outside I am not ableto connect to server. The weired thing is that I can user VPN with out any issues. I can connect to vpn but I cant access any internal resources. Even inside users are able to ping internet addresses with out any issue.
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Nov 14, 2011
What should i do on my Cisco ASA 5505 firewall to grant access to my network systems to access internet via gateway. I use ASDM to configure the firewall.
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Nov 14, 2011
I have a wireless Airport Extreme on Vlan3. My problem is that I can't get internet access from a wireless client which connects to the Airport which is on the DMZ. From my laptop which is connected to the Airport, I can ping the 5505. That's as far as I get.
asa5505(config)# sh running-config
: Saved
:
ASA Version 8.4(2)
!
hostname asa5505
enable password ArKd0aXL.wihdyE3 encrypted
passwd ArKd0aXL.wihdyE3 encrypted
names
[code]....
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Aug 7, 2011
ASA 5505 and DMZ and Base License,"For example, you have one VLAN assigned to the outside for Internet access, one VLAN assigned to an inside business network, and a third VLAN assigned to your home network. The home network does not need to access the business network, so you can use the no forward interface command on the home VLAN; the business network can access the home network, but the home network cannot access the business network." Page 6-17.
This is exactly what I need. Mail server in DMZ, full access from internet to DMZ, and from inside network to DMZ, no access from DZM to inside network. If I good understand, this is possible with base license.
I successfully configure, internet Access for DZM and inside network, Mail server can be accessed from internet, as well as RDP on inside network. But I have problem to configure communication from inside network to DMZ. [code]
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Jul 26, 2011
I am having a problem configuring my ASA 5505 for NAT.
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Aug 23, 2011
setting up an ASA 5505 to be used as a firewall between a BT internet router(BTNet service) and a Cisco 3560 Lan switch. BT have presented me with a cisco 3800 series router with the following details:
Network Address Network Mask BTnet NTE Router LAN Address
There are 2 Gigethernet ports on the back of the router port Ge0/0 is connected to the BT NTE and the status light is flashing green. Int ge0/1 is connected into port int e0/1 of the ASA but i am unable to get any connection.
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Apr 23, 2010
I can't access our ASA 5505 via SSH from the outside. I've configured this through the ASDM to allow SSH (Device Management > Management Access > ASDM/HTTPS/Telnet/SSH). I added a rule that allows SSH on the outside interface from 0.0.0.0 0.0.0.0. When I try to ssh in with putty, it says "server unexpectedly closed network connection" When I watch the logs on the ASA, it shows a Built inbound TCP connection on port 22, but then immediately a Teardown TCP connection. It doesn't show it's being blocked by any rule. Is there something I'm missing on enabling SSH?
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Aug 7, 2012
I am not able to get to the internet from my DMZ ip address.
Here is my config.
interface Ethernet0/0
switchport access vlan 2
!
interface Ethernet0/1
!
interface Ethernet0/2(code)
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Mar 8, 2013
I have a web server behind my 5505 that I'd like to access from the outside of the 5505 (still within my home network though). Its running on port 3000. I made the changes but I have been unable to access my server from the outside.
I do have an Airport Extreme in from of the 5505 and the 5505 is getting its address via dhcp from the airport. So I'm trying to hit 192.168.2.57:3000 from my wireless airport network.
[code]...
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Sep 22, 2011
if log on to the firewall with the enable_15 account remotely via a Cisco IPSec VPN client? Similarly, how do you restrict access to the ADSM to the local LAN for the enable_15 account? Is there a way to tell when a user last logged on via an IPSec VPN?
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Jan 11, 2013
I have question about license for ASA 5505. I have to put public access point behind ASA into DMZ. Do I need to hava the unlimited license? Does Securipty Plus license include unlimited users option and 50 VLAN or I will need different type of license.
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Jul 9, 2012
We have a Cisco ASA 5505. As of yesterday we could no longer access our web server (the web server is hosted off-site). Pinging the DNS address and direct IP (from the firewall and a PC) both return no response. Pinging the IP from the T1 router responds properly, meaning the router can access the web server, but the firewall cannot. Accessing the web server has never been a problem, and no configuration changes have been made to the network/firewall. Other locations can access the web server just fine.
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Mar 11, 2013
No connection via IE of any flavour
Chrome shows Error 113 (net::ERR_SSL_VERSION_OR_CIPHER_MISMATCH): Unknown error
I have 30 machines here, none of which have a serial port.
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Dec 31, 2012
ASA Version 9.1(1)
!
xlate per-session deny tcp any4 any4
xlate per-session deny tcp any4 any6
[Code]....
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Oct 29, 2012
I need to move the email traffic to a backup circuit. Below is my config. I have tried for email access but to no avail.
asa5505# sho run
: Saved
:
ASA Version 8.2(2)
!
hostname asa5505
[code]........
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Nov 29, 2012
Cisco ASA 5505
Cisco Adaptive Security Appliance Software Version 7.2(4)
Device Manager Version 5.2(4)
I have and vpn tunnel between a pix network (192.168.200.0/24) and an asa network (192.168.100.0/24); it's been running fine for awhile now but this morning i've come in an i can not access anything on the pix network, (mail, file & web servers). Each attempt to access results in a SYN timeout.
6 Nov 30 2012 14:24:01 302014 192.168.200.9 192.168.100.115 Teardown TCP connection 6014 for outside:192.168.200.9/135 to inside:192.168.100.115/51240 duration 0:00:30 bytes 0 SYN Timeout
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May 3, 2013
I'm currently facing a problem with a ASA5505. I've set it up from factory defaults... From the CLI, I can ping an the outside interface, the GW and an outside IP (ex:8.8.8.8).So I believe that there's no connectivity issue and the configuration is correct.
However, for a reason that I don't know, users can't have access to web pages.The product license allow me to have 50 host connected. Currently I've only got one host connected...
When I enable syslog, I can see the following messages :Deny traffic for protocol 17 src inside: 192.168.1.20/64429 dot ouside:8.8.4.4/53, licensed host limit of 0 exceeded.Where this limitation can come from ?
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Feb 1, 2012
with LMS 4.1 Reporting in several areas it is possible with selecting devices to use 'Group Selector' (e.g. Syslog Severity Level Summary Report).Group Selector dynamically chooses devices in selected Group at Report runtime to get the latest devices.Not all Reports in LMS 4.1 provide this Group Selector, e.g. Best Practices Deviations/Discrepancies.Is that a bug? As DCR changes often (add/delete) we urgently need to dynamically perform reports to latest DCR-Population.
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Feb 27, 2011
I am trying to enable access to use RealVNC on our Cisco ASA 5505 without using VPN. RealVNC uses port 5900. Users should be able to vnc to 99.23.119.78 and reach our internal server 192.168.1.4. So far they are receiving connection refused.
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May 21, 2012
I have a remote ASA5505 running 8.4(3) with a working site 2 site VPN tunnel to my main office. (The main office is running an ASA 5510 with OS 8.4.3 as well). The encryption domain is all private IP on main site vs. 172.16.10.0/23 on remote site.
Relevant config of the remote ASA:
interface Vlan1
nameif inside
security-level 100
[Code].....
I can manage the ASA on the outside interface (outside of the site 2 site VPN) using the TACACS credentials I can also ping my management station from the ASA using the inside interface, but as stated, the other way around does not work. I have not yet tested if management from the local 172.16.10.0/23 subnet works, but I will try this next.
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Jan 20, 2013
I've have an ASA 5505 with a inside network vlan1 (192.168.0.0/24) - i've configured an IPsec VPN profile and a VPN network of 192.168.0.50/24. I can through my VPN tunnel access inside hosts on vlan1 - but not ASDM on the ASA (192.168.0.1). Under management i've added the VPN network of 192.168.50.0/24 to have access to ASDM, but still does not work.
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Jun 29, 2012
I am running into a issue that I cannot seem to figure out. I have a asa 5505 with the Security Plus license. I setup a native vlan where all of my network devices sit on. ie my Wireless Access point has an ip of 192.168.3.2, my switch .3. I have no issues managing these devices from any vlan I am on (permitting firewall access rules). When I try to access my ASA via ASDM/SSH. I have to use the gateway of the vlan I am on. For instance. If I am on vlan 10 I have to use 192.168.10.1 for access, if I am on vlan 20 I type 20.1...etc...etc If I type in 192.168.3.1 I get an error in the ASDM logs that states TCP reset by appliance. This is for any gateway I type except for the gateway of the vlan that I am connected to. I am posting a sanitized config. How can I configure the ASA to permit access via any gateway.
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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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Feb 9, 2013
I have configured the ASA in a very similar manner to how the PIX was set up but I'm having trouble with some hosts on the inside accessing the Internet. Any inside hosts which use DHCP work fine. Any inside hosts with a static IP (and configured on the ASA with a "static" rule) cannot access the Internet. For example, in the config below the server daviker-dialler cannot access the Internet. I've spent a few days working on this now and have started from scratch several times but I'm not getting anywhere. Apologies for all the X's everywhere, didn't like to post anything sensitive on the Internet.
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Jan 5, 2012
We have an ASA5505 UL bundel, updated with this license "L-ASA5505-SEC-PL=" to enable traffic from DMZ to Inside. No NAT or rules deployed for that yet.
On the Inside we have Exchange 2007 in a single server installation. The public url for smtp, ActiveSync, OWA and Outlook Anywhere is mail.company.se. There is a static NAT for outside traffic to access above mentioned services on inside. Now, on DMZ there is the WLAN for guests to access the Internet. How ever, our Smart Phones with WLAN turned on, cannot sync to the Exchange Server on the Inside! The DMZ gets IP-addressen from ASA on DMZ Interface with external DNS configured. How can I configure the ASA to achieve the function of ActiveSync from DMZ to Inside with the public URL from the phones?
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Jan 5, 2012
How do I enable remote access to ASDM from outside of the network on the ASA 5505? This would be used for remote access to the firewall at a site that is not utilizing VPN.
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Nov 18, 2012
I have a closed network that is not connnected to the internet, just other sites that we want to communicate with. We have a cisco router connected to the outside interface on an ASA5505 and a cisco router connected to the inside interface on the same ASA5505. I have an inside interface that connects our management LAN, five separate DMZ interfaces with a separate LAN (VLAN) on each DMZ interface and the outside interface that connects to the other sites. Data is not allowed to mingle between the five DMZ's.
Alll connections to the other separate nodes are handled with the router on the external interface. IPSEC GRE tunnels have been established between all sites and BGP routing has been verified. Pings are good between inside, dmz and external interfaces and between the DMZ's and the other sites, to include hosts on our local networks and hosts at the remote sites. Inter and intra traffic is enabled.
When a remote site attempts an https connection, the initial ACK handshake makes it through the ASA5505, but the return SYN/ACK is being knocked down and I don't understand why (it is not because of ACL's, they are any any at this point).
Why the return SYN/ACK to the remote site isn't getting through the ASA5505 outbound. Will probably have the same issue with FTP, but right now, just trying to solve one problem at a time.
ASA5505 is in routed mode, not looking to NAT since the IP addresses in the DMZ need to be reached by their real IP address.
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Feb 23, 2011
configure my ASA 5505. It is setup using PPPoE. What I want to do is this:
I have one of my IP addresses (99.23.119.78) setup for ftp using the ftp protocol to our internal IP address 192.168.1.3. What I need is to also allow for HTTP access but not just that, I need it to forward the http port to port 9000 because the web interface requires port 9000 for customer access. Previously on our old firewall customers were able to access the web interface by browsing to [URL]. I would like to not have to not require the port in the URL.
In addition, I would like to be able to setup a different IP address in our range (99.23.119.73) to be setup for http access using the standard port 80 for the same internal IP address (192.168.1.3). This URL will allow us to access the administration web interface for the FTP server.
Here is my current config:
Result of the command: "show running-config"
: Saved:ASA Version 8.2(1) !hostname ciscoasaenable password qVQaNBP31RadYDLM encryptedpasswd 2KFQnbNIdI.2KYOU
[Code].....
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May 25, 2011
I would like to allow users from network 10.132.23.0/24, 10.132.33.0/24, 10.132.24.0/24 access to our SQL server(192.168.1.7) located on the inside interface(192.168.1.0/24 network) Those networks (10.132.0.0/16) come from the DMZ interface.
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