Cisco Firewall :: 8.4(3) / Outside-PAT All UDP Traffic But Exclude DNS?
Mar 6, 2012
8.4(3) I need to outside PAT all incoming UDP (SIP/RTP) traffic from outside to an internal IP. The following command makes it work:
nat (outside,inside) source dynamic any obj-10.0.0.173 service udp udp
But it breaks DNS resolution from inside. If I add the above command and try to nslookup from inside to an outside DNS server 64.90.175.90, DNS times out. If I remove the above nat command, it works again. It seems like even though DNS UDP originates from inside which should create a statefull connection, ASA still messes with return DNS responses.I then tried to create an "exclusion" for that IP with the following:
object-group network nat-exclusions
network-object host 64.90.175.90
!
nat (outside,inside) source static nat-exclusions nat-exclusions
but it's not working.I also tried:
nat (outside,inside) source static nat-exclusions nat-exclusions unidirectional
Also not working.How can outside-PAT all UDP traffic excluding DNS.
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Feb 13, 2012
I have the following setup:
ADSL ---> Cisco 877 with connected site-to-site VPN's ---> Cisco ASA 5505 with Remote VPN enabled
I want to connect my Android phone to the Cisco ASA 5505 with Remote VPN. When I forward port 500 and 4500 on the Cisco 877 to the Cisco ASA5505 I can connect with the phone.
But as expected, the site to site connections are lost because now they try to reach the ASA 5505 also.
I want to exclude the site to site external IP addresses from doing static NAT to the ASA 5505...how can I accomplish this ?
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Oct 17, 2012
I have a number of devices such as Cisco Call Manager, or Cisco Wireless Controllers, etc that I want to remain in DCR but would like to exclude from the Config Archive process. Is there any way of excluding an individual device from this process?
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Oct 13, 2011
I have an inventory added to Ciscoworks and am getting alerts on interfaces that I want to exclude but for the life of me I can't figure out how to exclude interfaces. Any tips on how to exclude interfaces from the fault engine in 4.1.
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May 16, 2011
I'd like to know if there is a way to exclude passed authentications for a specific username from reporting in the Authentications-TACACS and Authentications-RADIUS reports?
We have a few usernames that are used in scheduled jobs. We only need to know when they fail authentication, so we don't need to fill up the reports with every passed authentication from these accounts. Can this be done?
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Oct 4, 2011
In earlier versions of LMS it was possible to choose i.e. the Routers category (top level) and enter a series of commands to be excluded from the comparison. In LMS 4.0.1 I experience, in several different installations, that this is not possible. It seems I can enter one exclude command beyond the defaults per category, the rest is not applied even though the feedback from the application is positive. Next time I access the Exclude Commands view, the commands I entered are gone. Is this a change of behaviour or a bug?
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Jun 27, 2011
I'm working with Nexus 7010 - System version: 5.1(3).
For example, in the 7200 we can include or exclude an OID from the SNMP view entry using the command #snmp-server view.
How can we include or exclude an OID from the SNMP view entry in the Nexus 7010?
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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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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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Jun 3, 2013
I have configured a SVI in my 4500 ( Sup 7-E 10GE,,,,,,and,,,,,cat4500e-universalk9.SPA.03.02.00.SG.150-2.SG.bin) switch and it is showing Down Down, because there were no active switch port in the vlan, I added one switch port to this vlan but this port also in the down state, so i added the SWITCH PORT AUTO STATE EXCLUDE command under this port, even after this also the SVI never came up, So i added one systen to the port so both the switch port and the SVI came up...So why SWITCH PORT AUTO STATE EXCLUDE command have no effect in this model of the switch..
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May 23, 2013
I was asked to enable netflow in an ASA Firewall for Orion/Solarwinds server monitoration. Firewall is a 5550, with 4G RAM, and no extra modules but SSM-4GE. This firewall has 5 DMZ segments and ans specific segment for internet traffic.There are segments as unique subinterfaces in physical interfaces. Other segments as individual subinterfaces in the same physical interface (but individual VLANs)Usually firewall CPU flows between 30% to 40%. Rarely to 50%.
1 - How dangerous or risky could be implement netflow in this firewall?...This firewall is very critical for the customer. My concern is regrading CPU, traffic generated, memory, etc
2 - In a month, firewall will be migrated from 8.2 software version to 8.4 software version. Is there any incompatibility in some commands?...Would be recommended to perform netflow configuration after software upgrade?
3 - How could it be implemented for Orion monitoring, regarding each individual sub-interface (and so, each VLAN assigned)?I there any recommendation regarding configuration, best practices?
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May 3, 2011
We have 2 FWSM modules in each 6500 switches. 1st module is having 04 firewall vlan groups with 18 vlan interfaces in a single context firewall. All are working fine with no issues. Recently we create one more vlan on MFSC and add into the same firewall module. However newly created vlan inside the FW is not able to communicate with outside and also outside users not able to reach newly created subnet. But within the firewall zones (other interfaces) it can communicate. Once we did packet capture we noticed that its hitting firewall outside interface only and when we ping we got TTL expired error. we have default routes to outside and there's no any route inside as new segment is within the firewall (no any hop).
I guess there's no limitation on number of vlans that we can assign on one firewall eventhough there is a limitation for number of vlan-group which is 16 max (but we are within that limit).
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Jan 16, 2013
Ive got a problem with passing traffic through a Cisco 515e firewall.im trying to telnet to devices on the inside net, 172.16.x.x fom an outside net 10.x.x.x? ive configured a group called infrastructure and added the 10.x.x.x addresses.ive configured acl 101 inbound on the outside interface:
access-list 101 permit tcp object-group INFRASTRUCTURE any eq telnet
theres a route to the inside net:
inside 172.16.0.0 255.255.0.0 172.16.163.1
and theres a translation:
static (inside,outside) 10.4.4.34 10.4.4.34 netmask 255.255.255.255
when i try and connect, using a packet capture I can see traffic from 10.4.4.34 to the inside device 172.x.x.x on the inside interface but i cant see the traffic leave the outside interface ive used the same group infrastructure group before to connect to VM machines on the 172.x.x.x net on RDP and this wrks ok. access-list 101 permit tcp object-group INFRASTRUCTURE object-group VMs eq 3389
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Jun 11, 2013
My setup is as below
inside host--> ASA1--Outside interface- layer_ 2_Switch1--outside interface--> ASA2--inside interface-DHCP SERVER.
We want that inside host should get ip from subnet 192.168.10.0 /24. This ip pool is configured in DHCP server (ip 172.16.10.1) which is connected to ASA2. There is no routing issue as we are able to ping DHCP srever 172.16.10.1 from ASA1. to do config needed on ASA1 and ASA2 , so that host connected to ASA1 inside interface can get ip from DHCP srever. We have configured 192.168.10.1 /24 to ASA1 inside interface which will be gateway to inside host of ASA1.
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Apr 8, 2011
Our Local Network is behind the CISCO ASA Firewall.Whenever we are accessing to Client VPN server,it is getting connected but after few Minutes (May be 5/10/30 Min),the sessions are terminating. The same traffic through PIX is no issue , only with ASA Firewall. See the following Error and request you give the possible root cause for this.
2011-04-09 16:15:09 Local4.Info 172.16.1.68 %ASA-6-302016: Tear down UDP connection 87447908 for OUTSIDE:68.22.26.66/4500 to inside:172.16.9.10/4410 duration 0:27:49 bytes 18653
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Mar 28, 2011
They have an old cisco pix 501 firewall. I can access it via the device manager interface from my browser. What they want is to be able to get all the traffic from the firewall to the internet and vis versa. They want to know the originating nat IP address and the destination from the inside interface. I looked at the console and I can't find away to capture any traffic from either interface.
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Sep 18, 2011
My device has 3 interfaces configured: inside, outside, DMZ. Right now I can access the DMZ from the Internet and I can access the DMZ from the LAN using an exempt nat statement. I am having a few issues setting up DMZ > LAN access however. The servers running on the DMZ need to send information to my LAN such as syslog traffic for example. Will DMZ traffic be NATed or should this somehow be excluded? Bascially all LAN devices should get to the DMZ devices by their actual IP and vice versa. Are there any special statements I need to add to the ASA such as nat or ACLs to make this work? My LAN is 10.10.6.0/24 and DMZ is 192.168.254.0/24.
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Dec 15, 2011
\I just configure my PIX 515E with version 7.0(4) and having problems to get traffic out on eth0 (if name outside). There is no problems between different VLAN ,all VLANs are configure on eth1. It is also possible to accass services on VLAN 10 (DMZ) from outside. The only thing I see in syslog is "Built Outbound" and "Teardown".
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Dec 5, 2012
I am able to ftp from my Head Office to my test machine at the remote location but I can't get the other way around to work. Error message from the Syslog deny tcp src 192.168.50.5/1825 dst 208.124.202.44/21 by access-group "dmz_access_in".I try a couple of ways to fix it but no luck.A partial config of my ASA 5505. [code]
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Nov 28, 2011
I have a classical "inside + DMZ + outside" configuration.I also have a mail server in DMZ which have to be allowed to reach any destination on the outside (internet) at least on the SMTP port, of course.If I make an access rule that allows traffic from that server to "any", everything works fine, but doing so the server is allowed to reach any destination, including what is behind the inside interface (internal network).I didn't find any other option to tell the ASA machine to allow any destination, but on the outside interface only.I do believe is possibile to have the ASA to allow any kind of traffic from a host on the DMZ to the outside interface only, but I didn't figure out how.
P.S.: I'm using a 5510 machine running version 8.2
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Jan 22, 2013
I Have this Topology: R1 is as server and i want to public that server in INTERNET using public IP 7.7.7.7, but i can not do that. I tried to do a NAT but it just translate from DMZ to Outside, however i can not to ping to 7.7.7.7 from Outside (R2).
I have a route in R2
7.7.7.7 [1/0] via 200.200.200.1
On R2 i can´t ping to 7.7.7.7
On R2 i can´t ping to 172.16.0.2
On R1 i can ping to 200.200.200.2
On Inside i can ping to 172.16.0.2
when i try to ping from DMZ to Outside (200.200.200.2) the debug, and show nat details, show me:
ciscoasa(config)# nat: translation - dmz:172.16.0.2/26 to outside:7.7.7.7/26
nat: untranslation - outside:7.7.7.7/26 to dmz:172.16.0.2/26
nat: untranslation - outside:7.7.7.7/26 to dmz:172.16.0.2/26
nat: untranslation - outside:7.7.7.7/26 to dmz:172.16.0.2/26
ciscoasa(config)#
ciscoasa(config)# sh nat detail
[code]...
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Apr 23, 2013
I'm having a (fairly common) problem with my ASA in that I cannot get traffit to pass through it. I can't determine the source of this problem and need getting traffic from my inside network (10.1.2.1, please ignore anything labled 192.168.X.X) to my outside network.
-The border router can ping the Internet, itself, and the ASA's outside int (10.1.1.2)
-The ASA can ping everything
-An ASDM can connect and can manage the ASA via the 10.1.3.2 management cloud
-The inside router (R2) can ping the inside int of the ASA but not the outside
I've tried in both the CLI and ASDM to: -Add network objects to prepare configuring NAT (objects required after 8.3 I believe) -Configure NAT (static) -Configure ACL's to allow any traffic in any direction (just for these initial testing purposes) -Allow ICMP inspection (which was weird because my ASA had no global_policy and I had to make one)
The ASDM doesn't show any logging traffic when I try to ping from R2 (192.168.150.150 or old 10.1.2.2) to my Border (either ints, both being inside 10.1.1.1 and outside 172.16.68.190). Again, I can't even ping the outside int of the ASA from R2. [code]
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Feb 6, 2013
I've got a PIX running 7.2(4) with its outside interface on the Internet. The only thing this PIX is doing is acting as the endpoint for an IPSEC LAN-to-LAN tunnel with an Internet-connected ASA on another network.
I'd like to filter inbound Internet traffic to this PIX so that only the designated ASA can attempt to establish an IPSEC connection -- in other words, I want to prevent any other device on the Internet from even being able to attempt to establish an IPSEC connection to the PIX. As far as I know (and have seen), this can't be done with an access-list on the outside interface, since that access-list doesn't apply to traffic to the PIX itself.
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Jul 24, 2011
We have a BT Infinity broadband circuit which terminates at a vdsl modem, I've plugged an ASA 5505 into the back of this modem and gone through the ADSM quick setup wizard (yes I'm that much of a beginner!) The config that's been generated is pasted below, the symptomns I'm seeing are;
The ASA is setup with PPPOE on the internet connection, I assume this is correct as if I do a show IP on the ASA I'm getting an IP address that has been assigned, if I change the password to the wrong one then I get no IP (as expected).
If I ping from the ASA to an internet connection I'm getting "no route" error messages, if I try a "ping outside x.x.x.x" then I get no repsonses.
The ASA can ping it's external IP, the client machines can ping it's internal, however nothing appears to be able to get out.
ASA Version 8.4(1)
!
hostname xxxxxx
enable password xxxxxx encrypted
[Code].....
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Jun 11, 2012
I am trying to enable Ftp traffic through our firewall at work. We have a Cisco 5505 ASA and we cannot access any Ftp servers outside our network. We are running 8.3(2). Any have commands I can run to allow us to connect to ftp sites?
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Jan 25, 2013
I used the GUI configuration tool for this ASA 5505. When I install it no traffic passes. I am wondering to verify my config. I have masked the usernames for VPN with xxxxxx and yyyyyy. [code]
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May 20, 2011
Just wondering if there are any methods or commands, natively, in the asa5510 for determining all traffic in to and from a certain server passing through the asa. This would be without a syslog server or something similar.
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Nov 1, 2012
We just migrated from a single 5510 to a dual (failover) 5520, It seems that everything is working except the remote VPN. We can establish a tunnel and authenticate as local users, (going to LDAP when all is working) but no traffic is passing. I know I am overlooking something but cant see it. [code]
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Jun 12, 2011
Our ASA 5520 firewall is running 8.0(4) IOS.I have an internal L2L VPN terminating on my firewall (from an internal remote site) on ENG interface.With the default "sysopt connection permit-vpn" command enabled, VPN traffic is allowed to bypass the ENG interface acl.The security level on the ENG interface is set at 50.The security level on the destination interface PRODUCTION is set at 40.Inbound VPN traffic bypasses ENG interface acl and since higher-to-lower security level allows VPN traffic to flow freely from ENG to PRODUCTION, it seems the only place to check/filter VPN traffic is an ACL placed on the PRODCTTION interface and set at INBOUND (outbound VPN traffic).
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Nov 15, 2011
I am trying to setup my very first ASA5505 and I cannot get it to pass traffic from the inside to the outside. I am not using NAT/PAT. Here is what I have done so far.
ASA5505(config)# interface Vlan 1ASA5505(config-if)# nameif insideASA5505(config-if)# security-level 100ASA5505(config-if)# ip address 33.46.132.34 255.255.255.248ASA5505(config-if)# no shut
[Code]....
Then from the asdm I permited everything from inside to go out but I cannot get any traffic through. I can ping the outside if I source the outside interface but not if I source the inside. The logs would not show me anything.
I did a packet tracer and it indicates the implicit deny rule at the end of the access-list is stopping my traffic eventhough I have allow rules above it?
I also checked the box in the asdm to allow traffic to pass without NAT
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Dec 1, 2011
I have a Cisco ASA 5520 (8.0) and I'm trying to figure out how to prioritize traffic to specific websites (by either domain names or IP addresses/ranges). This document [URL] has some great examples, but I'm not able to create a class-map that will match addresses. I'm not doing any other traffic manipulation on this ASA.
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Mar 11, 2013
Core Internal Network -> Cisco ASA 5510 -> DMZ Switch.If i send a ping reguest from internal network to servers in DMZ Switch over the ASA 5510, i can see a delay in response, some times this delay can be more than 80ms, this is a problem for the web applications in http traffic.How i can find what's happening on my ASA? I disable the inspect traffic over the IPS, disable the policy maps below, reload the two boxes, but doesn't works, the problem still persists. [code]
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