Cisco Firewall :: 5520 As ISP Causes VPN To Be Disabled When Using Contexts
Jan 31, 2012
In the latest code, is VPN still disabled when using contexts? If you use a 5520 as an ISP based firewall for customers, then what would be used for VPN access? Also how many contexts does a 5520 support, and would putting 2 interfaces into an etherchannel for inside, and 2 for outside work? Reason I ask about that, the inside and outside would connect to 2 different core routers. I would be for an MPLS setup.
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Mar 27, 2011
Ive got a virtualised firewall running 3 security contexts in routed mode. What am experiencing is that i cannot connect to an OUTSIDE host through the security contexts. From the firewall itself i cannot ping the directly attached host on the OUTSIDE interface but i can ping the directly attached host on the INSIDE interface. When i reload the firewall box, the first ping to the OUTSIDE host would be successful but subsequent pings fail and thus total connectivity is lost.
I even tried upgrading to ASA version 8.4(1) but still the same.
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Jun 28, 2012
ASA 5520
version 8.2
My client has the inside network on interface gig0/1.100 and the guest network on gig0/2.200. The whole 10.77.1.0/24 network needs to be able to reach the server with IP 10.47.47.80 using HTTP. The access list is in place ont the guest interface to allow traffic to the server. The problem is that when I do a packet trace to see the traffic flow, it is dropped on a NAT rpf-check. NAT control is disabled. [code]
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Feb 21, 2011
Is it possible to route among contexts (I have 5 contexts) in the ASA without sending traffic to a fusion router (external router) to be routed. I am running ASA 8.3.
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Jun 4, 2013
What is the maximum number of contexts a pair of 5515Xs in HA mode can support?
I know each 5515X can have a max of 5 contexts, but does that mean in HA mode a pair can support 10 with license pooling?
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Apr 19, 2011
Q1. I would like to confirm like how many total of contexts do I have by default when I purchase the ASA 5540 ? are they two contexts aside from the admin context or two contexts including the admin context?
Q2. can I configure the default box with High Availability using the default contexts?
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Feb 27, 2012
I have two 7609S routers each with a FWSM running 4.0( 8). I am licensed for 20 contexts.
Recently, I added a context for a new application and required access to a VLAN that already had an interface in another context.
The MAC address assigned to the interface in the new context was assigned the same MAC address as the interface in the previous context. This caused an application running through the first context to fail.
I know that on the FWSM I cannot hard code a MAC address to an interface in a context so how do I get around this problem caused by the duplicate MAC addresses?
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Mar 26, 2012
I'm having problems getting FTP to work through two FWSM virtual contexts which are connected via a vrf. All this is configured on a 6500 switch with the FWSM running 3.1(4)
CLIENT-----CONTEXT_1-------VRF------CONTEXT_2--------FTP_SERVER
At the moment we can make the control connection but when we issue commands the connection times out.
Looking at the logs we can see the initial connection made to the server on port 21 from the client, this is also seen on the second firewall context (nearest the FTP server). The data channel is then seen on the first context, made using high src & dst port numbers and initiated from the client, successfully passing the ACL/Inspection, then on the second context we see the connection being denied by the incoming ACL on the second contexts interface connected to the VRF instance.
The rules are identical on the contexts and have been made by copying and paste the rule using CSM, we are using the predefined service group 'FTP-Group' which contains both tcp 20 & 21. FTP inspection is at default on both contexts.
We have tested with Win XP (capable of Active FTP only) & Firefox 3.6.12 which is the connections we are seeing in the logs trying to do Passive FTP.
Is this a problem with teh contexts randomizing sequence numbers or TCP Normalization? Or do we just have a problem with the Inspection engine on one of the contexts (I would have expected to see this on both contexts if it was a bug).
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Jun 28, 2011
I am just designing a solution where a FWSM consists of 2 contexts initially and has a shared outside interface pointing to the 6500 switch. There are 3 subnets connected to each of the FWSM contexts. So if anyone wants to access these 6 subnets then a route would be needed pointing to the interface vlan of the shared interface on the switch. But that would not be enough to access the subnets.. I am sure we have to define static NATS to point them to the right context where these subnets reside.
The FWSM is running version 3.x code So say 1.1.1.0(shared), 10.10.0.0(inside1), 10.20.0.0(inside2) and 10.30.0.0(inside3) reside in Context 1 and 1.1.1.0(shared), 20.10.0.0(dmz1), 20.20.0.0(dmz2) and 20.30.0.0(dmz3) reside in Context 2 in each of the context we would have to make three static NATS
static(inside1,shared) 10.10.0.0 10.10.0.0 netmask 255.255.255.0
static(inside2,shared) 10.20.0.0 10.20.0.0 netmask 255.255.255.0
static(inside3,shared) 10.30.0.0 10.30.0.0 netmask 255.255.255.0
The same would go for context 2 as well
static(dmz1,shared) 20.10.0.0 20.10.0.0 netmask 255.255.255.0
static(dmz2,shared) 20.20.0.0 20.20.0.0 netmask 255.255.255.0
static(dmz3,shared) 20.30.0.0 20.30.0.0 netmask 255.255.255.0
By creating these NAT statements, would the outside users be able to access the subnets residing in the context?
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Apr 3, 2013
if on the ASA 5512-X virtual contexts are supported with version 9.1 ?
I found different information on the Cisco web, the ASA datasheet says it is supported but in the configuration guide I found exactly the opposite information.
Cisco ASA Series General Operations CLI Configuration Guide 9.1 and 8.6 [URL]
Cisco ASA 5500 and ASA 5500-X Series Next- Generation Firewalls for Small Offices and Branch Locations Data Sheet (Updated) [URL]
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May 6, 2013
We are deploying the Cisco ASA 5585 in transparent mode with multiple contexts, the port-channel was configured to connect to the core switches using dot1q trunk. We are experiencing an issue which is the core switches are configured loop guard globally, therefore the port-channel connected to the firewalls will be put into inconsistent state when the failover happen, and the two firewalls' failover can not fulfill the failover at last.
I have two queries below:
1. Does the firewall allow the BPDU passing through when it is in standby mode, for example, secondary firewall is active for group 2 and standby for group 1. does the secondary firewall block the BPDU from the vlans under group1 ?
2. Can we disable the loop guard feature on the switch port-channel or is there any other way to solve this issue ?
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May 12, 2013
We are currently looking at design models for a Multi-Tenancy solution.The firewall layer will be 2 X ASA's running 9.X to take advantage of VPN's in multiple context mode and mixed L3 and L2 contexts.
We will be delivering services through multiple L3 contexts (between 2 and 5 L3 contexts for services) and 1 transparent context for customers infrastructure who will then have virtual firewalls for NAT's and VPN's etc withing their own environment.
I am not very experienced with IPS so my query is; if we were to get an IPS license for both ASA's how would the IPS fit in, can we use it to inspect traffic for all the L3 contexts and the transparent context?
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Jan 28, 2013
I have a ASA 5510 with Security Plus License and when I looked at the devices a few days ago I had 2 contexts, however after configuring the Mgm port as a regular port the contexts show 0, why? I can not find any post on the internet where this issue has happen: here is the output from show ver:
Cisco Adaptive Security Appliance Software Version 7.0(8)
Compiled on Sat 31-May-08 23:48 by builders
System image file is "disk0:/asa708-k8.bin"
[Code]......
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Feb 5, 2012
We are going to deploy a active/active setup of 2 ASA 5585's. Here we will implement a concept of security zones through context's where different services will be firewall through a separate firewall context. will a security context consume 1 or 2 licenses because we are running in a Active/active setup? Right now I got completely confused when my manager asked me that question.I would say that we only use on security context license - but since we are running in a active/active setup - even though the other instance is standby - will it consume a context license? We are using ASA OS 8.4.x.
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Jan 23, 2013
I have setup a 5515-X in transparent multi-mode and setup 5 security contexts with inside and outside ports, one admin and 4 others. The problem I have run into is setting up a management IP for each context. On one of my other transparent firewalls in production we were able to apply an IP to the security context (not interface) however the new firewall is running the latest software and this same functionality is not available. The only options for IP in context mode is IP AUDIT. So my next plan was to create sub-interfaces of the management interface and assign one to each context however the 5515-x does not allow sub-interfaces on the management interface. How I setup a management IP on each context?
Another interesting thing i read is that the managment IP assigned to a context (if i could figure out how to set it up), has to be in the same subnet as the data interface which if fine but it also says that the management interface should not be connected to the same switch as the data interface because of MAC address table update issues, meaning that i could not use a sub-interface of one of the already configured context ports.
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Jun 1, 2011
I have an ASA5520 in location A with an ISP connection and a matching ASA5520 in location B with a separate ISP connection. We have fiber connecting the two locations and vlans passing back and forth so I will be able to configure the failover via a vlan as well as extend the ISP's to each location via vlans. The Active/Active configuration with the multiple security contexts does not seem to be an issue but how is a redundant ISP configured in this mode?We want to have context A using the ASA in location A with ISP1 as the primary and failing over to ISP 2 in locaiton B We also want to have context B using the ASA in location B with ISP 2 as the primary and failing over to ISP1 in location A Would route tracking provide the desired result? Is there a better option?
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Feb 24, 2011
I have disabled Unicast RPF on a Cisco ASA 5510 for one specific interface. However, how do I verify that RPF indeed has been disabled on that particular interface? It doesn't show up in the config, neither does it up when I issue the command "sh int interface'.
To disable the RPF feature, I issued the following command: no ip verify reverse-path interface interface_name
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Mar 1, 2011
I am having problems with the Cisco VPN Client software version 5.0.07.0290 installed on a Windows 7 x64 Client.When attempting to connect through the VPN client I am being prompted with the following error: [code]
The client did not match the firewall policy configured on the central site VPN device. Cisco Systems Integrated Client Firewall should be enabled or installed on your computer.
The backend infrastructure used is a Cisco VPN 3000 Concentrator which has a Cisco PIX 525 Firewall.When the Firewall is disabled, the connection is made with no errors. But obviously, this is not good practice.The problem seems to lie with the Local Client Firewall?
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Jun 24, 2012
I am trying to configure two inside interfaces without NAT. I am not using nat-control and I have added exemptions for the two networks. I can communicate between the two networks and to the Internet just fine.I would like to verify that NAT is disabled between the two interfaces. I also need to make sure that the Interface IP (specifically for the traffic from inside-test to the inside network) is not added to packets between the two networks. I would like to be able to verify this as well. In other words I need to have the Source IP address from the originating connection on the inside-test network passed along through to the Inside network device without being replaced by the Interface's IP address. This is a test config for a production environment that will be using a load balancer. The config I have may be working in this regard and the load balancer may be replacing this IP address (that is what I am trying to test), but I am not certain.So far I have the following NAT related running-config command (in regards to these two interfaces):
access-list NAT_Exempt extended permit ip 192.168.12.0 255.255.255.0 interface insideaccess-list NAT_Exempt extended permit ip 192.168.3.0 255.255.255.0 interface Inside-testaccess-list NAT_Exempt extended permit ip 192.168.12.0 255.255.255.0 192.168.3.0 255.255.255.0access-list NAT_Exempt_2 extended permit ip 192.168.12.0 255.255.255.0 interface insideaccess-list NAT_Exempt_2 extended permit ip 192.168.3.0 255.255.255.0 interface Inside-testaccess-list NAT_Exempt_2 extended permit ip 192.168.3.0 255.255.255.0 192.168.12.0 255.255.255.0
nat (inside) 0 access-list NAT_Exempt_2nat (inside) 1 0.0.0.0 0.0.0.0nat (Inside-test) 0 access-list NAT_Exemptnat (Inside-test) 1 0.0.0.0 0.0.0.0
global (outside) 1 interfaceglobal (Inside-test) 1 interface
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Jan 14, 2013
I have a client that is running an ASA5512-X. When I initially installed it, they were having issues sending out emails. I disabled ESMTP inspection and thought it resolved the issue. Recently, they upgraded to Exchange 2010 and are still having an issue with some emails getting hung up in the queue. If I watch the ASA when they try to telnet to the external mail servers that do not work, they get a SYN timeout.
I am not sure why this would happen since ESMTP is disabled. They are running 8.6(1) on the ASA.
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Jan 16, 2012
I have disabled windows firewall in Windows 2003 server control panel but only few ports are shown opened when i scanned with advanced port scanner why other ports are closed.How to open the closed ports?
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Aug 23, 2011
Using a Mac running Mac OS X 10.6.8 with VPN Tracker 6.3.0.Before switching to the WAG320N I had no issues with my IPSEC VPN client. After the switch it consistently fails in Phase 1 negotiation.In the log file of the gateway I only notice: Mon, 2011-08-22 07:47:31 - [Outgoing] UDP Packet - 192.168.1.100:500 --> IP.ADDRESS.VPN.GATEWAY:500.The software itself complains about timeouts while contacting the remote gateway.VPN pass through is enabled, no port forwarding is set up, firewall is disabled.
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Nov 2, 2012
We were using ASA-5520-K9 with ASA-SSM-AIP-20-K9 but recently found some hardware problem in our running ASA. Now cisco want to replace with ASA-5520-K8.
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Feb 27, 2013
I'd like to see some REAL LIFE comparisons of ASA firewall throughput (a bit like this one for ISR G2 Routers - [URL].
The reason I ask is that I recently upgraded a firewall from an ASA5505 to an ASA5520 on a small network where the only outside connectivity was a single 10meg Internet circuit with an IPSEC VPN (not landed on the firewall but on a router) to another site.
When I swapped out the firewall the users noticed a big improvement. The firewall is not doing anything out of the ordinary - no IPS or VPN, just standard state full inspection.
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May 5, 2013
I have an asa 5520. How would I configure my dedicated management interface to be able to route off subnet while the firewall is in transparent mode?
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Nov 26, 2012
ASA 8.2(5), uauth absolute timeout is disabled and inactivity timeout is set to 48 hours:
timeout xlate 48:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02
timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00
timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00
timeout sip-provisional-media 0:02:00 uauth 0:00:00 absolute uauth 48:00:00 inactivity
timeout tcp-proxy-reassembly 0:01:00
timeout floating-conn 0:00:00
Users still get kicked out every 8 hours and they have to reauth. This is a logging message:
%ASA-5-109012: Authen Session End: user 'john', sid 839, elapsed 28801 seconds
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Jul 26, 2012
We are using the newest release of AD Agent (1.0.0.32.1, 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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Apr 15, 2013
I try to launch a LAND Attack against my firewall ASA 5520. Everything will work fine. But why, I think it should not work. I use a little tool where I can user a spoofed address, with a cluster shell and attack the firewall interface with the source of 127.0.0.1 ore the ip address of the interface as the source and destination. Then I get a cpu load of 89% with only two host. With IP tables I can use kernel processes to prevent this. But I don´t find anything for ASA.
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Jan 4, 2012
Two different WAN links get connected to the firewall via two routers.(Different ip subnets).I need to get this two wan streams seperatly to the core switches.Core switches sits.Active/Stanby senario. If the Active core goes down Stndby Core will have take over the traffic. My design is correct ,if not what do i need to change. ASA is 5520.
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May 22, 2013
I have ASA 5520 installed. I want to use ntp server for firewall clock setting. I found one open-access ntp server (stratum 2) in Los Angeles:
[URL] 209.151.225.100
Can I use the following command to set ntp server?
ntp server 209.151.225.100 source outside.
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Jan 1, 2012
communication between 2 vlans.i have 2 vlans
Vlan 100
ip add 1.1.1.1
!
!
!
Vlan 200
ip add 2.2.2.2
i want to make communication between 2 vlans on firewall 5520 ASA 8.2.
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Feb 27, 2011
I have a serious problem with my corporate firewall, witch is an ASA 5520, fv 8.3, with 8 +1 interfaces. It suddenly started to crash every 10/20 minutes and rebooting alone.
First of all I checked system resources witch are in a very low usage state. I also checked interfaces errors, but nothing strange come out o from error counters analysis. I tried disabling logging and all the service policy rules configured, but nothing changed.
Nothing changed and firewall continue restarting by itself.
Last logs I received before crash were:
%ASA-4-711004: Task ran for 35 m sec, Process = Dispatch Unit, PC = 84a619e, Call stack =
%ASA-4-711004: Task ran for 35 m sec, Process = Dispatch Unit, PC = 84a619e, Call stack = 0x084A619E 0x084A6512 0x084A70E1 0x084A7987 0x084A7AAA 0x08558B9B 0x08558E8A 0x083D3518 0x083CA145 0x080659D1 0x089196D9 0x08919790 0x089FF711 0x08A27468
Here the sh crash info command on module 0, after last reboot:
[Code] ......
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Nov 29, 2011
we are having a firewall asa 5520 .we have connected the management port and inside port to internal network and dmz port to dmz network.now we need to configure tacacs and other management tool on dmz devices through management port. The problem is the management devices tacacs and other are placed in internal network.
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