Cisco Firewall :: 2921 - ZBFW Not Blocking Traffic From DMZ
Apr 22, 2013
OK, I have a 2921 on 15.3-2T. ZBFW is working from the inside to the outside, but the DMZ is not being blocked at all to the inside. I am currently running with subinterfaces. All interfaces have zones attached. I have policies from inside to outside and DMZ to outside, those work fine. Without any policy from DMZ to inside, it can pass traffic freely from DMZ to inside. I have tried making an explicit policy to drop all to inside, still passes. I ended up just having to put an ACL on the interface
I already tried upgrading the IOS, that is how I ended up on the newest version. This is connected to a 2960S with a trunk port. Everything else works perfectly except for the DMZ security. I haven't had time to try to lab it up yet, but wanted to see if any reasons this shouldn't work, as all documentation says it should drop all traffic unless you make a policy to pass traffic.
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Feb 15, 2013
networking but can understand with a bit of explanation.. I own a restaurant and provide free WiFi for my customers with a Cisco E2500, I am gettign bills that are through the roof, I contacted my ISP and was told users were accessing P2P downloads(uTorrent, etc.). How can I block these applications?
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Oct 14, 2012
I have a LAN with several linux boxes (Fedora 17, both 32 and 64 bits), as well a a WInXP box. All of these are connected to the same switch, which is connected to the inside port of my PIX 515.
For a few sites (mozilla.org happens to be one of them), for http access, the tcp connection is established, but the "GET" request - or anything else for that matter - will not go through the PIX (from inside to wan). I have verified this by first, using wireshark to watch the packets being sent out from the client box, then by using the trace function in the PIX to see that the packets ARE arriving at the inside interface, but ARE NOT sent out of the wan interface.
This is for the linux boxes ONLY. When I do the same thing with my WinXP box, all works: in the PIX trace, I see the packets arrive at the inside interface, and leave the wan interace. And access to these sites are okay.
(What's a bit weird, although somewhat expected, when I connect my android phone to my LAN via WiFi, it too is unable to reach those sites - but then again, android is linux, right?)
In addition to the tracing, I have narrowed this problem down by connecting a linux box directly to my DSL router, then replacing the PIX with a simple router/gateway. Both of those solutions work.
Some background:
I have been using this PIX for about 10 years now, with the same configuration (except IP addresses). Only in the last several months has this problem started to show up.
I got this pix from a dead company at a really great price (free), so I'd like to keep it, and not have to spend money on something else. I don't have any support license, and have not been able to get any software upgrades. Here is its version info:
taz(config)# sho ver
Cisco PIX Firewall Version 6.2(2)
Cisco PIX Device Manager Version 2.0(2)
Compiled on Fri 07-Jun-02 17:49 by (code)
Serial Number: 405200362 (0x1826ddea)
Running Activation Key: 0x38ac31f3 0x0630df47 0x9a77b805 0x8bc39a60
PS: Since this PIX is at its end of life, I was wondering if any of the software upgrades would be now available without a license?
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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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Aug 21, 2011
I just made a move from a PIX 506 to an ASA 5540. I have a user that currently logs into a web portal and runs a job. It is now erroring out. When I run the test it gives me the following message:
Testing ports...
Port 1433: Failed
Port 1150: Success
Port 80: Success
Port 443: Success
One or more tests have failed
The computer we access this site from is on the inside network and the ACL says permit ip any any from the inside out so I am not sure why it is failing. Under the ASA Home screen I see the Top 10 Protected Servers under SYN Attack and it appears that the ASA thinks this is some sort of attack.
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Apr 5, 2013
I have a RV110W that's been in service since Dec 2012. All Everything is working fine except every month or so the firewall starts blocking all inbound traffic. It does not respond to remote management access. If I reboot the firewall (pwr off/on) everything works correctly for the next month or so and then it begins blocking all inbound traffic again. Local access to the Internet and VPN tunneling are not affected. When it's working, all my rules and port forwarding work correctly.
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Jan 7, 2012
Previous attempts to set up these NAT rules has been met with minimal success. We have been able to get the NAT rules created, and able to ping our inside servers and receivers from a different outside network, but every time we get that far our internal network crashes. Running the Packet Trace utility via the ASDM shows that internal traffic from the servers to the workstations is being blocked by the default implicit rule under the access rule heading that states "any to any, service being ip, action= deny". Reverse traffic from the workstations to the servers is being allowed though. In an effort to start over again, the Cisco ASA has been Factory Defaulted via the CLI, and has had it's Inside network, and Outside IP address set back up. DHCP pool has been setup for a minimal amount of addresses on the inside network, since most of our equipment will always be assigned statics. We reset our static NAT policies, and seem to be having the same problem. My partner and I have been working on this for some time now, and have ourselves so frustrated that I know we are missing something simple. [code]
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Apr 2, 2012
My internet link is connected on Internet Router & below downwards Cisco ASA 5520 is connected.ASA is connected with core switch cisco 4510 on downwards. our web based mail [URL] is hosted outside.
Lets suppose ISP pool is 4.4.4.0/28.suppose owa server is Static natted on ASA with 4.4.4.4. my machine traffic is going to internet with same ISP with PAT on Cisco ASA & internet is working on my machine. if i want to access {URL} or ip base for mail access, its not working & also it is not pinging. i suppose to ASA is blocking for returning traffic.
is there any way to traffic will go via same Firewall & comeback on same firewall port?
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Apr 18, 2012
I have a 1921 K9 with a 4 port 10/100/1000 EHWIC switch.
Interface 0/1 = 192.168.1.0
EHWIC = 192.168.5.0
I have Active Directory setup on the 192.168.1.0 network. When I attempt to join the domain from 192.168.5.0 it joins but I get errors. After some troubleshooting using portqry I have found that the services related to class map DomainTrafficUDP are being reported by portqry as being filtered regardless of policy map settings (currently set to allow).
Building configuration...
Current configuration : 18833 bytes
!
! Last configuration change at 11:20:25 NewYork Thu Apr 19 2012 by dave
! NVRAM config last updated at 13:56:45 NewYork Wed Apr 18 2012 by dave
!
[Code].....
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Nov 26, 2012
I am attempting to block outbound traffic for a specific PC on my LAN using the ASDM.
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Jul 31, 2012
I'm trying to run ZBFW on a 2811 with IOS version 15.3(T4) and I'm running into a strange issue I'm not quite sure how to troubleshoot.
I have 3 zones, internet, local, and ssl-vpn.The rules I'm trying to enforce are: all traffic from SSL-VPN can go to anywhere, anywhere can go to SSL-VPN. Anything originating from local can go out. Certain ports can come in for DMZ services (http, https, imap/s, pop3/s, submission).
After rebooting the router and applying f0/0 and tun0 to internet, f0/1 to local, and virtual-template 1 to ssl-vpn things work fine. But after a while I stop being able to connect to servers at the high end of the subnet. (I have .20 to .26 configured with the services, .20, .21 work fine always, .22 and up stop responding). Remove interfaces from the ZBFW, no problem at all. Apply ZBFW, traffic stops.
I'm seeing dropped sessions in the log on zone-pair local-to-internet , invalid flags with ip ident 0 which I think is outbound traffic attempted for no inbound inspect entry, but everything should be allowed out, and the traffic is to port 80 which is allowed by 'match protocol http' on the inbound policy.
Edited config attached (remove passwords and stuff) Last few log lines are at the bottom.
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Feb 16, 2012
I have a 7204VXR NPE-400 running c7200-adventerprisek9-mz.124-24.T3.bin at the moment. This device is being used as a firewall between zones in a service provider network.
My issue is we have a lab device on the corporate side that needs to talk SCTP to the core device. Since there is no option to match SCTP in ACLs or protocol matching, I can't really get this to pass properly. What is the new IOS versions support SCTP? Any options to pass this traffic through the firewall?
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Dec 27, 2011
I need to update my Cisco 881W config to allow port forwarding FROM the Internet TO the following inside device as follows:
IP Address: 192.168.1.254
Protocol: TCP/UDP
Port: 5001
This device is a Slingbox Pro-HD and I want to be able to view it from the Internet.
Attached is a copy of my 881W config. I am horrible at properly configuring my zone based firewall (ZBFW) config
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May 6, 2011
I can't find any specific information on the implementation of packet inspection in a zone based policy firewall. In other words, is there a specification or even just a set of values that define the default inspection parameters for all protocols? With DPI I can manage 'some' of the inspection capabilities but I have some fairly rigorous and specific requirements to meet and I need to validate that the IOS ZBFW will meet those requirements. Specifically, I'm interested in HTTP, DNS, and ICMP but all other protocols would be useful as well.I'm working with basic routers; 871's, 2811's, 1841's, etc. The IOS in use in most cases is adventerprisek9-mz.151-3.T.
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Jun 9, 2012
I have a Cisco 2901 which terminates a Class C address pool. I have split the Class C address pool into 3 sub-nets and 2 zones and created a non-addressable pool (private pool):
dmz-zone : x.x.x.0 TO x.x.x.127 (x.x.x.0/25)
in-zone: x.x.x.128 TO x.x.x.159 (x.x.x.128/27) & x.x.x.160 TO x.x.x.191 (x.x.x.160/27)
private-zone: 192.168.x.0 TO 192.168.x.255 (192.168.x.0/24)
I have configured private-zone NAT to use address pool x.x.x.161 TO x.x.x.189 within the in-zone.
Within the:
dmz-zone - are servers for : DNS, Syslog, SIP & HTTP/HTTPS in-zone - is a SMTP mail server which is behind VPN Gateway/NAT, TomCat (Application Server) and PostgreSQL Server private-zone - is where all standard users are operating from and they can access the SIP & HTTP/HTTPS servers within dmz-zone My problem is that I cannot seem to configure the ZBFW to allow the dmz-zone HTTP/HTTP server to redirect to in-zone TomCat server.
I do not want to make the TomCat server generally visible and am instead using the Apache proxy/ajp13 to connect from dmz-zone server to in-zone server.However I cannot seem to get anything (including icmp) to work from dmz-zone to in-zone.
I have Policy:
POLICY-DMZ-IN (dmz-zone to in-zone) which has:
any any udp/tcp inspect
any any icmp inspect
unmatched traffic DROP/LOG
But I still cannot get anything from dmz-zone to in-zone...Could the POLICY-DMZ-IN be being overridden by other dmz-zone to out-zone policies?
NOTE: I have routing rules for each of various sub-nets and all out-zone to dmz-zone, out-zone to in-zone and private-zone to out-zone, in-zone and dmz-zone routing works ok, so it appears problem is with ZBFW not routing table.
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Oct 23, 2012
We have a Cisco 2921 router at the head office (Easy VPN Server) and been deploying Cisco 887VA (EasyVPN remote - Network Extension) for remote offices using EasyVPN. We are allowing Voice and Data traffic over VPN. Everything has been working great until this issue was discovered today:
When a remote user behind Cisco 887VA calls another remote user also behind Cisco 887VA, the call connects and Avaya IP phone rings but no voice in either direction.
Calls to/from head office and external mobiles/landlines are fine. Only calls between two remote sites are affected. As there is no need for DATA connection between Remote office, our only concern is Voice support.
I think "hair-pinning" of traffic over VPN interface is needed. (Examples configs etc).
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Feb 18, 2013
We have Cisco Router 2921 in our branches. We need to get statistic about traffic patterns per month with per IP
1) Does NME NAM module provide this features?
2) For what period can name store traffic statistics?3) If yes, does Web-interface support russian language?
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May 16, 2012
I have a Cisco 2500 Wireless Controller connected and controlling 5 Cisco AP's. Everything works fine except one device.
This device is used to connect to our AP wirelessly and then any of the wireless laptops can use programming software to connect to the device and program through it. I can successfully set up our device on the network and all PCs can ping it, but the programming software refuses to connect to it. I spent an hour and a half on the phone with the device people who assure me its the network. So, I bought in a cheap Linksys router, hooked one laptop up to it and configured the device wirelessly. With that, the programming software works.
what should I be looking for in the Wireless Controller that may be blocking direct connection to the device even though I can ping it?
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Dec 28, 2012
I wonder if I can have a RV042 VPN Tunnel to a RV082, and in the RV082 block all traffic to the internet that comes form the PCs that are behind the RV042.
Remote PC -> RV042 -> VPN -> RV082 -> RV082 Firewall (block internet traffice, allow intranet traffic)
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Mar 29, 2012
I've blocked all traffic on port 80 (Advanced-Access Control- Apply Advanced Port Filter- All IP range and Port 80 selected) to avoid any kind of Web Access. I won't use Web Filter because there are too many URLs to be blocked.
However I have a problem to keep Google Earth working, since it uses port 80.
Is there a way to keep Google Earth working, even blocking traffic on Port 80? I've tried configuring an application rule to let Google Earth working, but it didn't work (it seems that I can not create an exception for Filter Port) .
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Sep 24, 2012
I inherited a Cisco ASA 5505 and am trying to piggy back the device off of an established Network. Here is the basic layout:
192.168.10.1 (Core Router - Handles DHCP/DNS)
192.168.10.9 (ASA 5505 - Piggy backing off of Network)
192.168.40.x (ASA 5505 - VLAN)
I'm able to get onto the Internet without any problems. Devices from the 192.168.10x Network can not ping the inside VLAN1 (192.168.40.x). However, I would like traffic going from the inside VLAN to the Outside VLAN to be blocked, except for 192.168.10.1 and 192.168.10.9. I've tried using ACL's but end up killing my Internet connection. 192.168.10.1 is the default route and is how I get out to the Internet. Is this possible? Essentially, I'm trying to set up a small Network that guests can connect to. The idea is that they can get to the Internet, but that is it. They can't get to internal resources on the 192.168.10.x Network
Here is the config:
ASA Version 8.2(1)
!
hostname ciscoasa
enable password EeCsulrpu.9LalEE encrypted
[Code].....
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Mar 18, 2013
We have been deploying Cisco SF200-24P switches for our systems for over a year now. They connect to a Cisco 881 router. In many cases we are also deploying Cisco AP541s.Over the last few months, on an intermittent basis, the switches will simply freeze, blocking all traffic flow. The power LED also goes dark. It appears the switch has frozen. The only thing that seems to revive the switch is a hard reboot by pulling the power cord. In the last couple of weeks, one site in particular has gone down a handful of times. That client of our is fed up. Our patience is running thin too.
I cannot see any indications in the logs to any event that might give a clue as to the problem. We definitely see this problem with the 1.2.7.76 firmware and the 1.2.9.44 (latest as of typing this). Not sure if with earlier 1.1.2 firmware.Without a fix, we likely will have to change switches and possibly vendors as we need a reliable switch.I see some vague references to a similar problem. And one reference to a SG300 series having what sounds like the same issue.
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Jul 5, 2012
I am configuring a 2921 with enhanced security using the CCP. I have found a behavior that seems strange to me and I'm not sure if I'm misunderstanding something or missing a setting. It seems that if I create a firewall rule to "allow" traffic through, that traffic gets dropped, but if I set the action to "Inspect", the traffic comes through fine. I can actually reproduce this at will by setting up a rule from out-zone to self to allow traffic and I cannot telnet into it from an external ip, but if I change that rule to "inspect" i can connect fine (i dont want that rule set up permanently, was just using it to test the firewall).
If I set the allow rule to log, I see the following line in the application security log:
(target:class)-(ccp-zp-out-self:user-fw-ccp) Passing telnet pkt 1.1.1.1:58141 => 2.2.2.2:23 with ip ident 0
(where 1.1.1.1 is the external laptop and 2.2.2.2 is my WAN IP address of the 2921)
So it looks to be passing the traffic, but that traffic is getting dropped somewhere because the connection is unsuccessful.
Is this the expected behavior of "Allow" action? Is there something I can do to make sure "allow" traffic actually gets through?
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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 (63.223.117.170).
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"
[Code].....
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Apr 2, 2013
I'm getting below msgs in my ZBFW logs on my test router. .Apr 2 23:09:43: %FW-6-DROP_PKT: Dropping icmp session 115.186.192.153:0 10.40.2.100:0 on zone-pair ZP-OUTSIDE-INSIDE class class-default due to DROP action found in policy-map with ip ident 0
The bit I'm curious about is that I am NOT NAT-ting any ICMP. Hence why is the ZBFW even triggering against the LAN IP? It should only activate after NAT according to order of operations (and hence why unlike CBAC you put the inside local IP not the outside global IP).....
If the ICMP was directed at the WAN interface (not the 10.40.2.100 internal IP) then it is allowed, but morever even if blocked it should be logged against my WAN IP (which is publicly routable not a 10.x internal).
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Jun 27, 2011
I just purchased thie Cisco 2921 router and have all the configuration completed except the Firewall and NAT. We have 4 supnets at our location on the router each with a DHCP handed from the router to our network. Any examples for the Firewall and Nat configurations?
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Mar 10, 2011
We are looking to implement traffic shaping/policing primarily for P2P traffic. As natively the ASA5550 is only capable of p2p inspection if the traffic is tunneled via port 80 is the AIP-SSM the way forward? We have 2 5550s in active/active failover config. As a side note we are also looking to implement an IDS/IPS system so could this module cover all?Is this module going to provide the desired outcome or is there another module/device out there better suited for this? I would prefer to use the ASA5550s as opposed to implementing another product if only that we can make use of the investment we already made on these devices.
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Jun 11, 2012
we just bought a 2921 with the following modules: 4 port clear channel T1/E1 HWICSM-ES3G-24-P: EtherSwitch.I read some CISCO documents, and not be able to find what I need. I would prefer all instructions from you are for CLI interface.This is my first time to deal directly with T1, WIC and 2921 etc. The following is what I get from ATT, IP masked IP Address Block IP Address: 20.20.20.136/29 WAN Link Details: WAN Link IP Address:13.13.13.92 AR Serial INT IP Address:13.13.13.93 CR Serial INT IP Address:13.13.13.94 WAN Link Subnet Mask:255.255.255.252
A: how do I configure T1, what does "AR, CR" stands for, and do I need to use both IP addresses? What is the WAN Link IP for?
B: We have two T1 lines, so I should plug them both to the WIC, say port 0 and port 1, how to configure them?
C: how do I access the firewall from the command line?
D: I followed T1/E1 HWIC installation guide, and as soon as I add channel-group to the controller t1, the serial interface went down?
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Jul 1, 2011
I need to configure the access list on the outbound internet port to accept the following:
ip access list 10
access-list 10 permit PPTP vpn any xxx.xxx.xxx.xxx
access-list 10 permit RDP any xxx.xxx.xxx.xxx
access-list 10 permit FTP any xxx.xxx.xxx.xxx
access-list 10 permit Postgresql any xxx.xxx.xxx.xxx
access-list 10 permit MacARD any xxx.xxx.xxx.xxx
This method does not work on the Cisco 2921 router with FW
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Nov 27, 2012
I am testing limit bandwith using my ASA 8.2, i am trying to limit internet access for certains users , i order to save Bandwith for the important things but i can´t get any limitation
My configuration is the following, the acces list is just for my pc in order to test, and the service policy is applied to outside interface (called internet in my case) for incoming traffic
access-list Internet_mpc_1 extended permit ip host 172.16.127.70 any class-map Internet-class-TEST match access-list Internet_mpc_1 policy-map Internet-policy-web class Internet-class-TEST police output 1024000 1500
service-policy Internet-policy-web interface Internet
With show service policy i can´t see any activity on the policy , but if i do a similar configuration for inside interface outgoing traffic i can see packets allowed and dropped
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Apr 29, 2012
I have an ASA 5520 with the below config
Gi0/0: outside (Internet)
Gi0/1: inside (Internal users)
Gi0/2: DMZ (web servers, ftp, Mail etc..)
I have a SMTP relay deployed on the DMZ for mailing. I have also a mail servers installed in the internal lan,
I want to allow trafic from dmz to reach internal lan, and i want normally also allow stmp relay from dmz to reach Internet.
How can i block trafic from DMZ to reach Internal Lan (instead of smtp) if the to allow trafic from dmz to internet i must put ANY in the policy?
For allowing trafic from DMZ to reach Internet, the policy must be DMZ -----> ANY ----->Services., this policy means DMZ can implicity reach Internal Lan?
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Feb 22, 2012
I have a IOS firewall on a 2921 router, zone-based config. The remote and main sites have Cisco WAAS , running 4.4.1 software. I am using WCCP redirection on the WAAS/router combination. If I leave it off the firewall passes SSH correctly to the devices on the other side of the firewall. If I enable WCCP the SSH connections fail. The SSH to the router itself is fine, I am not using the self zone for router protection. I had seen a few posts on WAAS but the only one mentioning a config statement in the firewall was on 4.0 WAAS and the command is no longer on the IOS firewall. Is this supposed to work transparently or am I missing a config?
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May 10, 2011
I have cisco ASA 5510 with ios version 7.07 & all users are browsing the internet via PAT through ASA. i want to block some sites/URLs like facebook, yahoo etc.
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