Cisco Firewall :: ASA5520 Bypass All Network Through Firewall

Dec 22, 2011

With regarding to the firewall ASA5520, i'm using it in my network, all the confiuration are properly configured and working but with the use of proxy address in internet explorer(e.: all the blocked contents as easily accessible simply it bypass all the network through will u guide me to block the proxy servers.

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Cisco Firewall :: ASA5520 / Can't Stream RTSP Outside Network

Jan 9, 2013

Equipment used:
VBrick Systems Inc., Model HPS 7102 HS-HD
Cisco ASA5520 Firewall
I have been trying to take a vBrick RTSP stream and stream it outside of our network:Inside our network, If I were to open VLC, and go to “Media”, “Open Network Stream” and paste rtsp:// the stream works, audio and video. Outside our network nothing.  I have opened ALL UDP and TCP ports to the vBrick 123.1123.157.10 on our firewall and tried from outside of our network:
access-list access-in extended permit tcp any host range 1 65535
access-list access-in extended permit udp any host range 1 65535
After adding this to the access list, the web gui (uses port 80) and ftp (uses port 21) is functional outside of our network...just not the rtsp stream which works fine internally.

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Cisco Firewall :: ASA5520 To ASA5520 Via L2L Tunnel

May 31, 2011

Our firewall expert has gone off on long term illness leave and I am trying to pick up the pieces :-(
We have an ASA 5520 (local office) talking to another ASA (remote office) via a VPN Tunnel.
My 1st problem is that I cannot ping from my inside network (local) to the outside interface of my remote ASA.
My 2nd is that I have debug enabled on my rules but am not logging anything.

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Cisco Firewall :: ASA5520 Unit Not Accessible On Network For Initial Configuration

Dec 15, 2011

We received an ASA5520-K8 through Cisco's Loan program so we could demo it as a replacement for our aging Cisco 3005 VPN appliances.  Given that we are a non Cisco shop (except for specific appliances like concentrators and wireless access points), I don't have a great deal of experience with Cisco gear.I started to set to setup the appliance this morning but immediately ran into issues.  The 5520 doesnt seem to be acting as a DHCP server, and worse yet, I can't access the unit even if I hard code the IP on the PC being used for configuration.  I have to say that I feel kinda stupid having to post this, since I actually followed the documentation avaiable for this menial task and I fully expect the problem to be a simple one.  Namely, I am using two specific sources of info for connections.

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Cisco Firewall :: ASA5520 / How To Use Network Object NAT To Perform Regular Dynamic PAT And Identity NAT

Jun 19, 2011

this is ASA5520 associate with 8.4(1). very simple scenario , three ports: inside . outside . DMZ my problem is how to use network object NAT to perform Regular Dynamic PAT and Identity NAT.

for example, this is my configuration

**** first i configured Regular Dynamic PAT****
object network myinside
nat (inside,outside) dynamic interface 
**** then , i met problem when i want to make identity NAT between inside and DMZ****
**** if i add below CLI , the first nat line will be replaced ****
**** SO IF I ADD THIS****


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Cisco Firewall :: Keep ASA5520 Firewall In Sync

Aug 22, 2011

I have two asa 5520 firewalls. one at my primary data center connected to our production Internet feed, and one at my fail over data center connected to a backup internet feed. I was wondering if there was an easy way to keep the firewall rules in sync between the two firewalls. We have failover with our isp that will move our public facing address block from our primary site to our dr site in the event of a disaster so the ip addresses will not change if we were to have to fail over to the DR site. currently i just have to do any changes that i make on the fail over server but would like a way to at least simi-automat this if not fully automat this so that i can eliminate the possibility of human error of a change happening at primary but never getting don at DR.

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Belkin Routers :: N450 Doesn't Allow To Add To The DMZ To Bypass Firewall

Feb 1, 2013

My Belkin N450 assigns a for an IP address. This does not allow me to add to the DMZ to bypass firewall and open my NAT. It wants a 192.168.2.__. What do I need to do to make this happen?

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Cisco Firewall :: ASA 5540 And Concurrent Sessions - Bypass TCP Connection For One IP

Nov 15, 2012

in Cisco ASA 5540 Adaptive Security Appliance Platform Capabilities and Capacities, I see Concurrent Sessions: 400,000. Which mean what device can handle 400,000 session and no more. But if I'm using TCP State Bypass Feature (Inbound traffic pass via ASA but Outbound goes via different device). I can see such connections via show conn command with b flag.
My questions: 1. Will this limit (Concurrent Session) affect in this case? Or ASA can handle more such connections (for example 800,000 ...) in bypass state? 2. It's possible to tune timeout for such connection without using global timeout conn? My problem what I want to do by pass tcp connection for one IP with has very high connection/sec rate.

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Cisco VPN :: IKE-UDP500 / Windows Firewall IPSEC Bypass Across Remote Client VPN?

Jun 15, 2011

I am trying to implement IPSec Authenticated Firewall Bypass on windows vista clients within my microsoft domain to avoid implementing numerous windows firewall port exceptions for each client.

This is working internally on our network, between services servers (i.e AV server), and desktop clients. However i am having a problem when the clients are remotly accessing the domain via the VPN client.I have open traffic ports (IKE-UDP500, ESP - IP Prot 50, AH - IP Prot 51) bidirectionally between the remote vpn clients subnet and the services servers, however when the endpoints initiate traffic to the services server, the IKE traffic is unencrypted?

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Cisco WAN :: Does The RV016 Port Forwarding Bypass Firewall Default Rules

Jun 20, 2011

when opening SSH service to a Database Administrator within my LAN, that has a RV016 as the default gateway. So confidence, I just set up a port forwarding in Setup > Forwarding and everything works fine, cool.
However, I do not want this to be a public access, I need a specific firewall rule for a specific external IP address (only the DBA fixed IP Internet might connect to my database server through SSH).
O noticed that when a port forwarding is created within RV016, it bypass the firewall default rules and wide-opens the service (port) to the web. Conceptually, this is correct, as port forwarding is a network translation, but I expected that my firewall had work over this.
My current solution was to create a "Deny from all" rule at port 22 and then create one additional rule that allows traffic from an specific IP at port 22.

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Cisco Firewall :: Only One Internet IP Can Be Used In Asa5520?

Sep 25, 2011

I have a asa5520 with five Internet IP.One for the internet interface and the others are static maped to dmz hosts. It runs rightly until yesterday.Now it will lose the connection to the gateway many times everyday and the dmz hosts can not connect to internet any time. configuration(simplified):
interface GigabitEthernet0/0
nameif internet
security-level 0


I called ISP to check,when ISP clear their router's ARP, the asa will lose the connection at the same time and then the ISP's router couldn't learn the ASA's MAC. After I 'clear arp' manually,The ISP's router can learn the ASA's MAC and the connection recovered,but the DMZ's cann't access internet still (of course,There is no problem between DMZ and ASA ,I ping the internet gateway from DMZ host and can not get any reply.).

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Cisco Firewall :: Upgrade 8.2.2 On ASA5520?

Oct 3, 2011

We have 2 x ASA5520 and I upgraded this to 8.2.2 last year, I see 8.2.5 and now 8.4 is out.  If we are having no issues, is it best just to leave it as it is?  I can see a couple of features I may find useful in 8.2.5, but 8.4 seems like a huge jump and a risky one too.

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Cisco :: Firewall ASA5520 Is Very Slow

May 8, 2011

I have one firewall ASA5520, are very slow

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Cisco Firewall :: Cannot Ping ASA5520 From LAN

Mar 7, 2011

I am trying to introduce an ASA5520 to my network based on the following diagram: ISP Internet ------> ASA5520 ------- > Cisco Router ------> LAN. The problem is I cannot ping the ASA from the LAN. I can ping it from  inside the router.  I already allow ICMP within ASA. If i remove the  cisco router and replace it by a swich, I can ping the ASA with NO problem.

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Cisco Firewall :: ASA5520 With Different CPU Type?

May 16, 2011

We want to use ASA5520 but both Firewall have different CPU. One has CPU Pentium 4 2400 MHz and another has Pentium 4 Celeron 2000 MHz. Can it be configured for replica / failover?

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Cisco Firewall :: LAN To LAN Between ASA5520 Version 8.3 And PIX?

Apr 19, 2011

We have 2 firewalls on PIX facing the Internet and connected to interface e1 (behind it) an ASA version 8.3 Both the PIX (Firewall facing) and the ASA are on the same subnet.
By using Routing statements and statics I have been able to reroute specific traffic to the ASA5520 version 8.3 Now I need to inverse the 2 devices. The ASA5520 will be facing the Internet and the PIX will be behind it.Unfortunately the ASA5520 is refusing to route the traffic to the PIX. The access-lists are open accordingly and a NAT on the ASA has been created.

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Cisco Firewall :: Client Uses ISP DNS Under ASA5520?

May 31, 2013

i have my router connected to ISP then my router directly connected to my ASA5520....i use also ASA5520 as my DHCP Server and i was wondering with the DHCP Server function of ASA 5520 because if i use the ASA 5520 LAN ip ...all workstation will not be able to browse anything from the internet unless i use my ISP DNS IP which they gave me?

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Cisco Firewall :: Using CSC SSM 6.6.1125.0 With ASA5520 8.4(4)1?

Sep 4, 2012

Get the following log message on secondary ASA console output when turning on the ASA failover function?
"Mate's service module (CSC SSM 6.6.1125.0) on slot 1 is different from mine (CSC SSM 6.6.1125.0)"
After that the secondary cannot join as a failover unit and shows in disabled status.We have the same model ASA & CSC module and each pair of them are in same firmware (CSC 6.6.1125.0 with ASA5520 8.4(4)1), when I shutdown both the csc modules, the ASA failover works fine.

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Cisco Firewall :: ASA5520 To Act As Web Proxy

Dec 15, 2012

I am using a squid proxy behind an ASA5520 firewall to collect the users to the internet. Squid is just necessary to log what is going on in order to find a quick solution when the internet slows down.
Considering that I have unlimited licenses and I would like to get rid of squid, I wonder if the ASA has some functionalities to track which websites are being used and how much traffic is generated. If there is not, I would like to know if Cisco offers a good product to replace Squid.

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Cisco Firewall :: ASA5520 Upgrade 7.2 To 8.4

Jun 8, 2011

Upgraded an ASA5520 from 7.x to 8.4 in one step? Release notes for 8.4 state that you can "...upgrade from any previous release directly to 8.4..."  I've read the previous version release notes and see the various changes in NAT etc that 8.3 made.

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Cisco :: ASA5520 / Two Firewall Are Unknown On LMS 4.0.1

Jul 5, 2011

My customer had 2 asa5520 version:8.0(5)20 and LMS 4.0.1.Two Firewall are "unknow" on LMS, why ?Normally, LMS manages ASA with version 7 min.

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Cisco Firewall :: ASA5520 VPN Support Over DSL

Jan 5, 2012

Any limits on the number of IPSec sessions an ASA5520 can support over a DSL connection?
Currently, as we increase the number of IPSec VPN tunnels, our LAN switches connected to the DSL/ASA start seeing CRC/input errors.   Tried different LAN ports for both DSL/ASA connections - same reults (CRCs and errors).   Swapped ASA for PC running 1 IPSEC w/HD video and no issues.
VPN connection bandwidth demand 50% of DSL capacity, so not exceeding DSL bandwidth.    Errors get so bad that all VPN sessions drop - sometimes VPN sessions re-establish while other instances a DSL modem reboot is required.
cause of LAN switch connections seeing errors with 4+ VPN sessions established on ASA across a DSL Internet circuit?

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Cisco Firewall :: Cut-Through Proxy Not Working With ASA5520

Jan 16, 2012

I'm trying to configure an ASA 5520 with cut-through proxy feature. The user is required to be authenticated when trying to access an outside resource from the inside. This is a test lab before it is implemented in production. [code]

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Cisco Firewall :: How To Enable Not Used Interfaces On ASA5520

May 12, 2011

I have a pair of brand new 5520s I am in the middle of commission.  After carving out all the DMZs etc I needed I realized that I really neede another physical NIC, not just another VLAN off a configured nic. [code]I am running 8.3(2).  How can I turn these "Not used" interfaces into useable ones?

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Cisco Firewall :: ASA5520 Cannot Ping Outside World

May 22, 2013

I have Cisco ASA5520 with  a 8.4 code in GNS3.  I have a problem pinging to the internet.  On the ASA console, I can ping  to outside world, but on vpc  I cannot ping the outside world.  But I can ping the ASA Inside interface and other VLANs, no problem. [code]

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Cisco Firewall :: Access-list On ASA5520

Feb 23, 2011

I have a question about access-lists on ASA: (5520 running 8.4)Often I want to permit all traffic from networks behind an interface (let's say DMZ in this example) to Internet, but NOT to internal networks. Then I  first configure a Deny from DMZ to all internal network and then a Permit to ANY. If I forget the first Deny I will allow all traffic also to my internal networks. Is it possible to configure an access-list that permit all traffic from a network to all networks that are reachable via a given interface? In this example: Permit all traffic from DMZ to all networks that are reachable via the Outside-interface? This should permit traffic to Internet and deny traffic to internal networks in one statement.If I specify the outside-interface as the destination only traffic to the interface itself will be allowed.

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Cisco Firewall :: ASA5520 Not Allowing Traceroute

Oct 31, 2011

I've got an annoying problem with my ASA 5520.I have traffic going from the inside interface (security level 100) to the outside interface (security level 0) with a global PAT applied to the outside interface address for all inside traffic - and I can't seem to traceroute through the firewall.The ruleset is simple - basically, allow any IP from inside to outside. The NAT is simple - PAT all traffic unless exempted to the IP address of the outside interface.If I do the trace from my internet edge router it works fine - so I know it's not soemthing my uplinks are filtering - but if I do it through the firewall, I get perfect responses until the hop where it hits the firewall interface - then nothing.Is there something I am missing that I need to do to allow traceroute to just work with all the rest of the traffic?

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Cisco Firewall :: How To Verify If CG-NMS Is Enabled On ASA5520

Apr 11, 2013

how do I verify if CG-NMS is enabled on ASA5520. I just need to know if it's enable/install to be enabled and used?Cisco Adaptive Security Appliance Software Version 8.0(5)28..Device Manager Version 6.1(5)51

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Cisco Firewall :: Inspect Not Working In ASA5520?

Aug 15, 2012

I have a cisco ASA5520 box running with IOS version8.2(5)13 where default policy map is applied globally. But I have not seen any traffic being inspected through included protocol defined under policy map.All configuration seems to be ok for me.
service-policy global_policy global
 Global policy:
  Service-policy: global_policy
Class-map: inspection_default
Inspect: ftp, packet 0, drop 0, reset-drop 0


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Cisco Firewall :: SSH Stopped Working On ASA5520?

Mar 27, 2012

I can no longer SSH to a primary active firewall. It had all of a sudden stopped working.  However I am able to SSH to the secondary standby firewall without any problems. I did try to regenerate the RSA key on the primary fw, but still unable to connect. The only way I can connect to it is by using telnet.
I ran the "show asp table socket" command and I'm seeing port 22 listening on the primary IP address (not the standby), foreign address is*. I did a packet capture on port 22 on the inside inside, seeing my request hit the fw and then right away a reset back from the fw.
version 8.2.(5)
model ASA5520
I'm hitting a bug in the software version I'm running? Or what else can I check before rebooting the primary fw?

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Cisco Firewall :: Zero Downtime IOS Upgrade On ASA5520

Jun 5, 2011

We are planning to upgrade IOS on a 5520 pair, from 7.2.4 to 8.2.4, and cause minimum outage. And according to the documentation, we can do the zero downtime IOS upgrade by failing over to the standby ASA and back.
So, can during this process, can we go from 7.2.5 to 8.0.5 (last maintenance release), or do we have to move to 8.0.2 first ?

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Cisco Firewall :: ASA5520 And Public IP Zone

Apr 5, 2011

I'm trying to setup a zone behind my firewall with complete publicly routeable IP addresses for 3 servers. The reason I'm doing this is I am in the network setup stage of an OCS implementation, and OCS connections don't behave well with NAT.
My device is a ASA5520. I have an internal zone, and a dmz zone. These are done via standard NAT configurations.
My question is this:
Is it possible to setup connectivity to the outside with internal servers that have Public IP's directly on their NIC's? Another little detail of interest is that this ip space is seperate than the one that's on current Outside interface facing our ISP. However we own both address space.

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Cisco Firewall :: ASA5520 External Flash For 8.4

Apr 6, 2011

I am in the process of setting up the ASA5520 with the latest 8.4 firmware   latest Anyconnect 3.0.
Unfortunately, the internal memory is sufficient enough for the ASA ASDM only. It says not enough memory when I tried to tftp the Anyconnect pkg.There is a external flash slot at the back of the ASA, I've inserted a 256mb CF card but when I do a show disk1: it shows

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