Cisco Firewall :: Unable To Edit IP Based ACL Firewall Rule In RVS4000?

Apr 8, 2012

I am a novice with networks but do have a fair understanding of networks. I have a small business network, utilizing a RVS4000 router (Firmware V2.0.27)I am attempting to set up firewall rules to block certain web sites at certain times.I have successfully set up rules using source and destination ranges, to deny service 24 hours a day everyday.
However and here is the problem when I attempt to edit any of the rules (I want to change the time to certain hours of the day) it allows me to edit the rule but when I attempt to save I get an error message up saying there are invalid characters and it will not save the changes?create the whole thing with the changes I want it works fine, is this a known bug?

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Cisco Routers :: RVS4000 Default Firewall Rule?

Sep 15, 2011

RVS4000 has default firewall rule from ANY WAN -> to ANY LAN with status Allowed. Should that be denied by default, like in RV042 or RVL200?

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Cisco Firewall :: ASA 5505 - Cannot Add Rule Without Deleting Implicit Rule

Jan 18, 2011

what is the purpose of the "Permint all traffic to less secure networks".
Well I know the purpose and the technique to handle some sercurity level is nice. when I cannot add add a rule without deleting this implicit rule?
The technique of security level is then obsolete?

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Cisco Firewall :: 871 - Edit Firewall Exceptions

Aug 5, 2010

My goal is to be able to edit firewall exceptions "on the fly" and without having to hack an ACL. I have created a service object-group that contains exceptions to the firewall, however when I apply this object-group to the firewall ACL, it opens up the ACL entirely! What am I doing wrong with this configuration? Thanks very much for any insight you can provide!
Cisco 871 running c870-advsecurityk9-mz.124-22.T.bin. Here are the configs:
ip access-list extended FIREWALL permit object-group FIREWALL-EXCEPTIONS any any log permit udp any eq boot ps any eq boot pc deny   ip any any


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Cisco Firewall :: ASA5505 Firewall Rule Not Blocking

Apr 1, 2013

I'm trying to troubleshoot an ASA5505.
The original goal was to block "Mumble/Murmur" (a voip app) traffic, which runs on TCP/UDP 64738, both inbound and outbound, except to a certain host (
However, when nothing I tried seemed to make a difference, just to troubleshoot, I decided to try blocking all inbound traffic.  I first disconnected ethernet port 0/0 to ensure that it was cabled correctly and the outside interface went down when I did.  That worked as expected, so I confirmed I had the right interface and it was cabled correctly.
I then applied a "any any deny ip" rule as the first element in the outside interface access_list, as you can see below.  However, it appears to have had no real effect and the hit count is very low (it should be astronomical).
show ver 
Cisco Adaptive Security Appliance Software Version 9.0(2)
Device Manager Version 7.1(2) 
Compiled on Thu 21-Feb-13 13:10 by builders
System image file is "disk0:/asa902-k8.bin"


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Cisco Firewall :: Rv042 - Firewall Access Rule

Jun 3, 2013

I have a server behind an rv042 that i would like to block access to on one port from outside in.  I have configured the rule as follows:
priority = 1.  policy name<name>.  enable<checked>.  action = deny.  service <service to block>. source interface = wan1.  sources = any.  destination = <public ip address of server>.  day <nothing>. 

This does not block the intended port from outside.  I also changed the destination to be the private ip address and i changed the source interface to LAN and to *.  What is the correct syntax to do this?.  Port forwarding is enabled.  I noticed that there is one entry in the forwarding table for the public ip but it is going to a dead private ip address.  Would this have an effect? 

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Cisco Firewall :: 2901 - How To Avoid SMTP Inspection On Zone Based Firewall

Aug 2, 2011

We had a problem with SMTP inspection dropping some regular emails (Cisco 2901 IOS 15.0). The original configuration.

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Cisco Firewall :: 2901 To Avoid SMTP Inspection On Zone Based Firewall

Jun 21, 2011

We had a problem with SMTP inspection dropping some regular emails (Cisco 2901 IOS 15.0).Incoming mails are going thru Spam and Virus Blocker so that bypassing SMTP inspection is not security issue in this case.

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Cisco Firewall :: IOS Zone Based Firewall Websense URL Filtering Feature On 881G

Jul 27, 2011

I've been trying to configured Websense urlfiltering using ZFW feature on my Cisco 881G router. The router is running on IOS 15.0(1)M with Advanced IP Services. And I have confirmed it supports urlfilter feature.
This is what I tried to accomplish but IOS version 15.0x seems to have different command set.
class-map type inspect httptraffic
match protocol http
parameter-map type urlfilter param
server vendor websense

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Cisco Firewall :: 1811 / Zone-Based Policy Firewall Configuration

May 16, 2011

I have two 1811's connected in a lab using a ipsec vpn tunnel (using a switch to simulate an internet connection between them).I am trying to configure one of the routers as a ZBPF just to allow a remote windows login (DC on the firewalled side, workstations on the other side).I'm trying to verify that the zbpf is working, but it doesn't seem to stop anything.  I had match icmp added to the class-map, but took it out to test if icmp would fail.  It didn't.  Basically, I don't think the firewall is working at all.  Any thoughts on how I can configure this so that the policies will work between zone-pairs?

Here's an quick drawing:

Here are the configurations:

 Local router:
 hostname sdc-1811-LocalLab
no aaa new-model
resource policy


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Cisco Firewall :: 5520 Identity Based Firewall Doesn't Work Using Citric Published

Jul 26, 2012

We are using the newest release of AD Agent (, built 598). The ASA Firewalls 5520 are having the software release 8.4(3)8 installed.When somebody tries to connect thru the Identity based firewalls from a citrix published desktop environment (PDI) the connection is not possible. Checking the ip-of-user mapping on the firewalls (show user-identity ip-of-user USERNAME) mostly doesn't show the mapping of the USERNAME and the PDI the user is logged in. The user-of-ip mapping of the PDIs IP-address shows mostly other users, which then are used to authenticate the acces thru the firewalls.
What is interesting, that on the AD Agent using "adacfg.exe cache list | find /i "USERNAME"" i can't see the PDIs IP-address neither because it is mapped to another user.Is Citrix Published Desktop environment supported to connect thru Identity based Firewalls? How AD Agent, Domain Controllers and Firewalls are working together? On the firewalls with "show user-identity ad-agent we see, the following:
-Authentication Port: udp/1645
-Accounting Port: udp/1646
-ASA Listening Port: udp/3799
Why Cisco does use 1645 and 1646 and not 1812 and 1813?The Listening Port is used for what purpose? we tried the AD Agent modes full- download and on-demand with the same effect.

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Cisco Firewall :: 3945 / Zone Based Firewall And WAN Interface ACL?

Mar 16, 2011

I am getting ready to deploy a 3945 ISR to serve as an internet and core router for and remote site.  I will be terminating a site-to-site VPN tunnel on it and also configuring a zone based firewall config between my "outside" (internet link) and "inside" (all internal nets).  My question is about how to approach securing the WAN interface with the Zone based FW in place?what kind of ACL do I need beyond those allowing and restricting remote access to the outside ip? 

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Cisco Firewall :: 1841 - Which IOS Support Zone Based Firewall

Jan 3, 2013

I have a cisco 1841 router  , and i want to configure zone based firewall on it. But the document of zone based firewall only said that "after 12.4(6)T" can support zone based firewall. I use the ios  " c1841-ipbasek9-mz.124-15.T9.bin ", but it can't support ZFW. What kind of ios support ZFW. for example: ipbase, ent base, ip service ,advent etc.

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Cisco Firewall :: Zone Based Firewall Performance On ASR 1004

Sep 11, 2011

we are experiencing performance issues on ASR 1004 with ZBF as our campus edge router.Symptoms:

- sending small packets from inside zone to outside zone, for example UDP packets without payload
- this way I can generate up to 150.000 pps traffic (testing with packeth software, but we have had a real example with some kind of worm/virus)
- CPU load is about 1% (yes one!) to 2% all time !! (weird)
- ASR response to pings rises very quickly up to 5 seconds which makes box unusable dropping everything what goes through ZBF (so internet connection is gone)
- if I do the ping directly from box, it seems to work fine (no rules from self to outside zone in ZBF)
- if I remove interfaces from inside and outside zone (so disabling ZBF) and do the test again, ASR response goes from normal (0.2ms) up to 2ms (still sending 150.000 pps) and everything seems to work fine)
According to Cisco Datasheets: routing, Qos, Zbf ... on ASR 1000 with RP1, ESP10 should be done in hardware with up to 17.000.000 pps performance.

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Cisco Firewall :: RVS4000 NAT To ASA 5505 Firewall?

Mar 18, 2011

I’ve been using a Cisco ASA 5505 Security Plus bundle for two years now without any problems. My previous Internet Service Provider was routing the external IP I was leasing directly through to my internal network without NAT which my ASA 5505 was working well with. Thus, I had configured my 5505 to provide NAT to my inside network which includes two subnets one for my workstations and internal "private" resources and a DMZ to provide access to my webserver, email server and two domain name servers; but restrict access to my internal; resources. i recently changed my ISP to Verizon FiOS (which is providing me with 25 Mb bandwidth at a fraction of the cost of my old T1) which is set up to provide 5 Static externally facing IP numbers for my email, webserver and name servers;. The problem is the Verizon router doesn’t support my use of the ASA Appliance (at least not the way it is currently configured. Verizon recommend I purchase a business class router and use it in place of the one they provided with my installation. With this in mind, I bought a Cisco RVS4000. I have configured it to use the primary external IP number and have internet access; however, the new router is providing NAT addressing which the ASA is in conflict with (they are both using the same NAT IP range). I'm assuming the ASA 5505 is expecting to have access to the external IP addressed (since that is what it was getting before) and NOT NAT address. How to configure the new router to either provide access to the five static external “real world” IP to my Cisco ASA Firewall. However, I just need to get my ASA 5505 back in the loop and would prefer to do this rather than go back to the Verizon router combined with a low end firewall. So, my questions are: Does the ASA 5505 expect real world External IP numbers? Or can it work with NAT addresses being fed to it from the router?  And, if so, how do I configure the access rules and other items which are currently mapping to external numbers?

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Cisco Firewall :: 2951 Zone Based Firewall

Feb 16, 2011

I am confiuring ZFW on a Cisco 2951 Router. The router has the following interfaces: [code]Port Channel 1, 1.5, 1.10, 1.15, 1.20 have been added to the zone called IN-OUT. All the subinterfaces correspond to an internal VLAN.The router is connected to a MPLS network and has a BGP peer on interface MPPP. Over the MPLS network, an ecrypted DMVPN tunnel to HQ has been built (tunnel 0). EIGRP is the routing protocol running over the tunnel.Traffic coming in from HQ has to be firewalled on this router (don't ask me why!!). As a result, I am configuring ZFW on this router.
1-The router itself does not need to be protected, only the servers in the remote offices. That being said, I am not planning to create any self zone on this router. I don't want to break BGP, therefore the MPPP interface will NOT belong to any zone. Is this the correct way to do it?
2-The tunnel 0 interface will belong to OUT-IN zone that will protect all incoming traffic into this site from HQ. So when writing class-maps for the traffic coming INTO this site, do I need to write any class-maps for EIGRP or ESP? My guess is no, since that traffic will not be coming into the site, but rather just terminating on the router.

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Cisco Firewall :: 1861 Zoen Based Firewall

May 1, 2011

having a very strange problem with a Cisco 1861 running - Cisco IOS Software, C1861 Software (C1861-ADVENTERPRISEK9-M), Version 12.4(24)T5
I have suddenly started to get performance issues with downloads and access through the ZBF. Without the firewall enabled and just having NAT enabled and routing  , downloads perform as expected - ( have been using Itunes download as test file ) - with the ZBF enabled , and the necessary rules installed to inspect & allow traffic - downloads stall - and the only way to get the downlaod to start again is to pause , then resume. The stalls are anything between the first 25 - 120 secs.
I have debugged and performed packet traces - but cant see anything untoward. I have also placed another router ( just a cheap Belkin )  on the ADSL service and again , the downloads work as expected.
one further thing to add is that when im tunneling through the firewall ( VPN ) , then downloads do work as expected - suggesting that the issue is with native HTTP(s) traffic..I have upgraded from T4 to T5 - and the symptons still remain - I am thinking that these may have been introduced when i upgraded to T4 a few monthes ago.

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Cisco Firewall :: SR520 ADSL Router - How To Add / Edit Class Maps Rules

Mar 26, 2013

I got myself lately Cisco SR520 router with some basic firewall functions built in. This is going to be used for my home broadband, so no need to be really super secure, as it would be for some business. I managed to configure it, however there are few things on the firewall side, which I don't understand.

This router had some default configuration in it's flash, when I bought it. There are class maps.... how it works or how to add/edit rules. Also, do I need to use class maps, or can they be replaced by ACL's to certain extend? How to add/edit class maps rules to allow certain port (eg. 3333). Pease see below part of the default config:

class-map type inspect match-any SDM-Voice-permit
match protocol sip
class-map type inspect match-any sdm-cls-icmp-access
match protocol icmp
match protocol tcp

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Cisco Routers :: RVS4000 WOL Rule Not Working From WAN (Internet)?

Oct 17, 2012

I picked up an RVS4000 V2 and configured a rule to forward a Magic Packet to an internal system to wake it from a sleep state. Everything was working fine until I update the firmware to v2.0.3.2. I know it's not the the computer as I can wake it from Sleep internally without any problems. One thing I noticed is that the static IP for the computer in Sleep state gets lost in the ARP/RARP Table though the NIC is configured to respond to ARP requests in Sleep.
Has anything changed in v2.0.3.2 that requires a different configuration to get Wake on Lan working externally?

My Setup is
P8Z68 Deluxe/Gen3 onboard Intel 82579V NIC
Wake on Magic Packet: ON
Respond to ARP/NS requests without waking system: ON
 RVS4000 V2 (v2.0.3.2)
Mode: Gateway


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Cisco Routers :: RVS4000 - Format To Input Into ACL Rule Range

Feb 18, 2012

I have read through the manual. My question is what is the proper format to input into the ACL rule "Range"?  Would as an example work- - Will the range effectively work? Or does it have to be -

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Cisco Firewall :: ASA 5510 / 4GE SSM - FP L2 Rule Drop

Nov 10, 2011

ASA 5510 running without issues for a while but we needed extra port so added a 4GE SSM.
Having installed the 4GE SSM we had some issues with the card not liking a connection to our switches and only working by plugging directly from the server into the firewall, not great as we wanted extra servers on the line in the future.  So we upgraded the firmware and no are at an impasse.
We have upgraded to 8.0(4)3 and now we cannot get any traffic through the port, we can't even connect to an external DNS server.  Running a packet trace I get an immediate error on the first step '(l2_acl) FP L2 rule drop', and it appears as though the outside connection is down.
I have some experience on setting up basic port forwarding and NAT for internet access, webservers, mail but this has thrown me. 

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Cisco Firewall :: ASA 5505 - Creating NAT Rule

Mar 7, 2012

Our external security department needs to scan, every three months, a computer behind the firewall. I need to create a simple NAT rule that will allow an ip address or subnet to the computers behind the ASA 5505. At the moment, we have a simple NAT rule which allow all network traffic to exit from inside to outside.

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Cisco Firewall :: ASA 5505 - Adding New Rule For Network?

Mar 30, 2011

I have an asa 5505 and I would like to adding a new rule for a network, however it was added, it seems it would be inactive. I have two inside network, (name: lanA) and (name: lanB) I have the following in the running-config:
access-list lanB_acl line 1 extended permit ip any
access-group lanB_acl in interface lanB_interface
But when I tried to reach a host in the lanA, the packets are dropped. I configure the asdm, which shows this on the LanB interface:

1 lanB_network | any | ip | permit (hits 344)
2 any | any | ip | deny
 and I checked the packet tracer with: tcp, source: dest: and it shows that the packet has been dropped by the last 2. 'implicit any any ip deny' rule, in spite of my access-list rule (access-list lanB_acl line 1 extended permit ip any) preceded it, and active.
The lanB and lanA interfaces are the same security level 100, and I can reach the outside/internet from Is it possible that I have to reload the rules or something like in order to apply? Or I missconfigured something?

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Cisco Firewall :: ASA5520 - Access-Rule ASDM Ver 6.2(1) Vs 5.2(3)

Apr 17, 2011

I am creating access rule on a ASA5520 running ASA 8.2 (1) and ASDM 6.2(1) and found that the GUI has less option then when creating access rule on a ASA5505 running ASA 7.2 (3) and ASDM 5.2(3) (see attachment). Is there an option that enables me to get the same configuration options on the ASA5520 running ASA 8.2 (1) and ASDM 6.2(1) as I have on the ASA5505 running ASA 7.2 (3) and ASDM 5.2(3).

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Cisco Routers :: Rv082 Firewall Rule Not Working

Oct 14, 2011

i have a Cisco Rv082 with Firmware v4.0.4.02-tm (Jul 4 2011 13:30:56)I have configure WAN1 with a public IP and netmask (Only one public IP in use) Internally the LAN is a need to add some rules like

Service: HTTP
Interface: WAN1
From: ANY
But after rule configured the connection still not working, it only works when I add a port forwarding.For HTTP maybe port forwarding is OK, but other services I need to grant access to a specific public IP address, not to everyone. So I need the Firewall rule, but is not working, it always block the request. [code]

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Cisco Firewall :: ASA 5510 - Add A NAT Rule For Range Of Ports?

May 22, 2012

i have a cisco asa 5510 and would like to add a NAT rule for a range of ports like 50000-59999

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Cisco Firewall :: PIX600 - Correlate Access Rule

Oct 13, 2011

I have a PIX with 600 active access rules but many rules arent't in use. A lot of the rules aren't necessary anymore but I don't know what they are. How to know what rules are working?

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Cisco Firewall :: ASA 5510 Global Implicit Rule

Nov 24, 2011

I got a Global Implicit Rule problem with my Cisco ASA 5510. Here's my configuration : url...I created a PAT translation so that my web server (group LAN Network) could be accessed from the Internet.Although every rule seems to be ok, i got a "tcp deny access" when i try to telnet my public IP on port 80 (ping is ok).
Why is there only one Global Implicit Rule, and not one for each Interface (like in the older versions of ASA OS) ?

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Cisco Firewall :: ASA 5500 - Learning Mode For New Rule

Mar 29, 2012

Can you set the ASA 5500 series to learn the rule itself? I am talking about putting it into learning mode for first few weeks. I have done this with Zone Alarm software, but not sure this is available in Cisco 5500 series. 

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Cisco Firewall :: Asa 5510 Error - Cannot Add Policy To Rule Engine

Mar 5, 2013

I am trying to add 89,462+ access list rules to an ASA 5510 running 8.2(5). I have added all the rules to an object group and when I try to apply the access list to an interface it gives me the following error:
ERROR: Cannot add policy to rule engine ERROR: Unable to assign access-list wan-out to interface wan
I have not tried not using an object group and just putting the rules in the access list. I want to be able to add to these rules if needed easily.
I think it's clear that i have exceeded the rule limit for the ASA. So my question is, what is the rule limit for an ASA 5510 and which ASA could I purchase that would handle this amount of rules?

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Cisco Firewall :: ASR 1000 ZBF Can Use Police Action In An Inspect Rule

Mar 23, 2011

I have two questions about ZBF on ASR1000 with Firewall and Flexible Packet Inspection license:
1 is IPv6 supported?

2 can I use police action in an inspect rule? I want to limit some protocols to low bandwidth. There is no police command in ZBF policy map.

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Cisco Firewall :: 5520 Why Does Dynamic Policy NAT Rule Apply

Jun 4, 2013

we have a nat exemption rule for to w.x.y.z followed by some static nat rules and then dynamic policy nat rule for to w.x.y.z natting to IP a.b.c.d.When I do a packet trace from to w.x.y.z, it shows the packet first matching against the nat exemption rule, and then immediately afterwards it matches the dynamic policy NAT rule. The static nat rules are being successfully bypassed (which is what I want), but why does the dynamic policy nat rule apply if an exempt rule has been hit already? An actual test between the IPs above reflects the result of the packet tracer as well (IP a.b.c.d is seen on server w.x.y.z).We are running the following software on an ASA5520.

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Cisco Firewall :: ASA 5520 Flow Is Denied By Configured Rule

May 28, 2013

I am attempting to allow traffic from one vlan to another.Vlan 1 is on Interface 0/2.vlan1Vlan 2 is on int 0/3.vlan2Each vlan can communicate inside it's own vlan, and the gateway on each responds to vlan specific clients My problem is that I am unable to communicate between the two vlans.  Using the ASDM packet tracer tool, I find that packets are denied by the default rule (on the second Access List lookup).  It appears as if the packet never reaches the other interface.  The access rules are set up to allow traffic from one vlan to another (inbound), on both interfaces.  Testing from either vlan to connect to the other fails.  Below are the accee-rules for each vlans.  Once I get basic connectivity working.
access-list aVlan1; 3 elements; name hash: 0xadecbc34
access-list aVlan1 line 1 extended permit ip any (hitcnt=0) 0xeb0a6bb8
access-list aVlan1 line 2 extended permit ip any (hitcnt=0) 0x3a7dfade
access-list aVlan1 line 3 extended permit ip any (hitcnt=0) 0x93302455
access-list aVlan2_access_in; 3 elements; name hash: 0x6dc9adc7
access-list aVlan2_access_in line 1 extended permit ip (hitcnt=0) 0x054508b7
access-list aVlan2_access_in line 2 extended permit ip (hitcnt=0) 0xc125c41e
access-list aVlan2_access_in line 3 extended permit ip host (hitcnt=0) 0x4adc114c

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