Cisco Firewall :: ASA 8.2 Security-level Default Behavior
Nov 16, 2012
I'm trying to implement some best practices for ASA running on Software Release 8.2 and had a question about the default security-level behavior. Let's say I have 3 interfaces...
-inside (security-level 100)
-dmz (security-level 50)
-outside (security-level 0)
I have an ACL on the inside interface allowing http access to anywhere. Because of the ACL, the implicit higher to lower security level access is nullified. Correct?
I do NOT have any ACL on the dmz interface applied. So, would the servers in the dmz be allowed outbound access to the Internet due to the default higher to lower security level behavior?
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Jan 28, 2013
Quote from the RV180 manual; 'By default, all access from the insecure WAN side is blocked from accessing the secure LAN, except in response to requests from the LAN or DMZ.'
Does this mean a general access-rule for the firewall blocking all inbound (WAN --> LAN) data is not required?
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Nov 10, 2011
On a Cisco ASA 5520. I have 2 interfaces that are the same security level. I need hosts on 1 of these interfaces to be able to get to a specific IP and port on the other but I DON'T want to blanket enable 'same-security-traffic permit inter-interface" I have added an ACL inbound on the interface allowing the desired traffic and inbound on the other for return traffic and it simply doesn't work.
interface GigabitEthernet0/3.175
vlan 175
nameif Test175
security-level 30
ip address 172.30.175.1 255.255.255.0
[code]....
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Mar 27, 2013
I have issue with traffic passing between same security level interfaces. I want to control traffic between same security level interfaces with ACL. Even no restriction, traffic does not go through. [code]
I tried to access server from THREE network to web server at FOUR network I have no response. In sh xlate output it shows "PAT Global 10.124.104.254 (28889) Local 10.124.103.1(2922) " I am not sure what else should I do. I add both same-security-level commands and it is the same.
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Jun 25, 2011
I'm facing a problem with two vlans. Each vlan has internet access by NAT.
In each vlan there is at least one server, who should be accessible from the other vlan and vice versa.
The function "same-security-traffic permit inter-interface" doesn't work, because NAT control is in place - so an expert.
Some experts told me it's not possible to route back out the same interface, and also not route back out the seperate subinterfaces as well.
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Jul 14, 2012
I have ASA 5585 with SSP20. I want to enable same security level subinterfaces (routed mode) to communicate with each other.
I have put below command at global level but somehow it is not happening.
hostname(config)# same-security-traffic permit inter-interface
Do I also need to check for NATing or some other things apart from above command?
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Jan 23, 2012
Verifying the operation of the ASA when configured with Global access rules. Does the global rule overide the interface security levels? According to the ASA order of operations, the interface specific rule get's processed first and then the global rules, but It does not say anything about interface security levels. Observing an ASA in production that has global rules configured I see that an interface with a security level of 50 that has no rules applied to it, passing traffic to the outside interface (security level 0) drops the traffic. Syslog shows that it hits the global access rule implicit deny. Does the implicit permit any to any less secure interface not apply?
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Oct 27, 2011
I've just been testing QOS on 3560 with version 15.0(1) and it seems the the default qos trust behavior on access ports has changed. By default the trust state of a port is not to trust anything, however rather than rewriting the DSCP value of the incoming packets and settign it to 0 the switch now seems to leave the DSCP value unchanged.
SW04-C3560(config)# do sh mls qos int g0/2
GigabitEthernet0/2
trust state: not trusted
trust mode: not trusted
trust enabled flag: ena
[Code]......
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May 23, 2012
I upgraded a pair of ASA 5520s from ASA 8.3 to ASA 8.4(4) this week and now my DMZ hosts cannot reliably communicate with eachother. I have a DMZ network of 10.20.20.16/28 configured. 10.20.20.17 is the ASA/Gateway and 10.20.20.19 is one host and 10.20.20.20 is another host. These two hosts had no problem communicating with eachother before the upgrade. Now, they usually cannot communicate with eachother. Occasionally they can communicate, but only for a few minutes. What is strange is I never had any access lists for these hosts to talk with eachother before the upgrade (because their traffic to eachother should have never reached the firewall) but now I needed to create an access list on the DMZ interface allowing these two hosts to talk. ICMP works fine, but only if the ACL is in place. TCP rarely works.
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Jun 27, 2011
I have ASA 5505 that has two inside security level 100 interfaces and an outside interface.On the inside interface we have corporate domain subnet with DC and 30 hosts. On the inside2 interface I have few servers that runs specific application important for our business needs, and dumb terminals that are connected to them.I have a laptop user that periodically needs access from our corporate vlan1 to one of the servers on inside 2 vlan via remote desktop or some other remote viewer client,so he can view reports etc.I have enabled same-security-traffic intra-interface command and added nat exempt command pointing specific laptop host machine to that specific server.
Now my main concern is regarding security. This user carries his laptop home, browses the web, puts USB memory, and you can imagine how this machine is susceptible to all kind of malicious software. Inside2 vlan is very important and until now it has been a very secure environment.This is no longer the case since all traffic between this inside sec level 100 vlan host and corresponding inside2 sec level 100 server is now allowed because of the enabled same level interface traffic and nat exemption rule. Do I have another solution that would allow communication based on just a tcp port number for this host? Something like port forwarding from outside to inside Vlan interface?
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Jun 21, 2012
In the last 8 month I have been upgrated at least 6 Cisco ASA 5505 from 8.2(1) to 8.4(3) without problems, I did a minor changes and all related to rules due a problem with the migration.
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Sep 21, 2012
I have 2 dmz interfaces(dmz1 and dmz2) with security level 50. I am able to ping the hosts on dmz2 from dmz1. I am running a service on a dmz2 host on port 82 but i am not able to access that service from dmz1. Also, i have an inside interface at security lever 99 which is able to access that service.
Also, i have defined the following command to allow same security level communication.
same-security-traffic permit inter-interface
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Feb 3, 2011
We have an ASA5520 firewall, IOS 8.0(4), running in routed mode with an operational Cisco 2821 router to ASA-5520 L2L IPsec VPN.:All Internet searches explain how to enable a L2L IPsec VPN from the LOWER security-level interface to a HIGHER security-level interface- and this is how our setup is configured and it is operational and working fine.:We now have a need to setup another L2L IPsec VPN tunnel on the same firewall BUT this time traffic will be arriving on the HIGHER security-level interface destination is to a LOWER security-level interface.:Is it possible to enable a L2L IPsec VPN tunnel between a HIGHER security-level interface to a LOWER security-level interface?
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Sep 21, 2011
We have an ADSM (version 5.2(3) ) . In ASA ( version 7.2(3)) we are working with routing, access restriction and configuring IPSEC vpn with integration to our AD. We need to get two diferent profiles: one for networking administrators, who are going to manage routing, acls and have the root for ASA, and the other profile is going to be for the vpn administrators. As I read from the ASDM 6.0 user guide is posible define command privilege level. So do you consider posible to define a particular level for all the command related with ipsec vpn (Create, Modify and Delete) and asociate that particular level with the user for vpn administration.
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Apr 15, 2013
I am trying to configure site to site vpn between Cisco ASA and Cisco router 3825, I need to establish the vpn connection with an interface that has security level of 90.I followed the procedure shown in the following link: URL.
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Feb 17, 2013
I have been monitoring the alarm summary but have been off couple days and i see one of my controllers is down. Getting critical level security and message is port is down on the controller, condition link down. The other issue is config difference found between NCS and Contoller, I tried getting them to sync together but still getting the same message.
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Aug 8, 2006
ASA 5510 security plus edition will it support active/active failover. and does it support context with securiyt plsu edition. and how many default context do we get with asa 5510 security plus edition.
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Mar 5, 2012
I'm fine tuning some of our ASA logging config, and am having an issue with one particular syslog ID.The message is: syslog 106100: default-level informational (enabled)and the log settings are:
Syslog logging: enabled
Facility: 20
Timestamp logging: enabled
Standby logging: disabled
Debug-trace logging: disabled
[code]....
This ACE log entry is generated by explicit deny any any statements at the end of all the ACLs, e.g.access-list inside_access_in extended deny ip any any log interval 600 Based on the config, I would expect to see this being logged to the syslog server, but not to the local buffer, but am still seeing them locally in the buffer:
Feb 22 2012 10:58:20: %ASA-4-106100: access-list inside_access_in denied udp INSIDE/HOSTABC(52629) -> OUTSIDE/HOSTXXX(162) hit-cnt 5 300-second interval [0x3baecf1e, 0x0]
It also still shows these as level "warning", %ASA-4-106100, instead of the default %ASA-6-106100 I've tried removing and re-applying the config at different levels but it still reports in the buffer log as level "warning", %ASA-4-106100 This also doesnt affect every 106100 log that is generated. Most messages are generated at the correct level 6 severity but some seem to randomly log at level 4. There doesn't seem to be any pattern to this. The same access-list line can produce severity level 4 and 6 106100 messages.
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Jul 17, 2011
I have been net searching this question and I find answers relative to other Cisco products but not for the 6500 series. We are running entservicesk9_wan-mz.122-18.SXF17a.bin and would like to know how to change the default SSH listening port..
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Mar 17, 2011
I´m trying to configure a subinterface named Inside with vlan 1 but the interface stops work with this vlan.My switch is a Cisco and use the lan with vlan 1 too.If I change de vlan for other i.e vlan13 works fine. And all others vlans works fine too.Is there a problem to use the vlan 1?
My configuration is:
Cisco ASA:
interface gig0/3
no ip address
no security
no nameif
Interface gig0/3.1
vlan 1
nameif Inside
Securirity-level 100
ip address 10.x.y.x 255.255.224.0
The giga port of the swtich is configure to trunk model.
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Feb 20, 2012
Can we set ips 4260 into factory default settings with a single command?
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Aug 24, 2012
In case I configure duplicate IP addresses to the same VLAN(two interfaces in VLAN 1100 have IP address 192.168.2.2) I see following ARP messages rapidly(those six messages were received in less than 2ms time-frame)
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Jun 5, 2012
I am researching on the behaviors of routers when MTU is increased beyond the MTU set in the routers. Also, when I use jumbo frames instead of normal MTU, how does it affect the network. So, what I plan to do is
LAN_A -- > blackbox --> WAN --------> WAN --> blackbox --> LAN_B
All the traffic coming from LAN_A will be of size 1500 Bytes or less. The blackbox in the center will add an overhead of 4 bytes, recalculate the CRC and transmit the packet on the WAN side. I wanted to know that:
1- if my LAN router and WAN router, both are set at 1500 MTU, then will WAN router drop the packet if it receives a packet greater than 1500B ?
2- If i keep my LAN side to 1500 MTU and I switch my WAN router to Jumbo frames, how will this configuration affect the complete network ? Will it work or not ?
3- I want to add the overhead on every packet coming in from LAN side, so, what options do I have to achieve this goal ?
PS. All types of traffic can come from LAN side.
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Dec 14, 2011
We have a lab network set up with a 7609 router as the central core. Scenario: Laptop with a SIP client. In the lab is a session border controller that will route signaling and media to a SIP gateway with a call agent (172.23.112.201) and a media "handler" (172.23.113.6). The call processing device will forward packets to an RF network (108.x.x.x) where an NCS cable modem sits.Call signaling works perfectly fine. However, RTP traffic from the laptop to the NCS phone is getting routed incorrectly. RTP traffic from the phone to the laptop works fine. [code]
Packet captures show the laptop to phone RTP packets are being routed back towards the corporate router. These time out with ICMP TTL exceeded packets. There are static routes for 172.23.113.0/27 to the optical interfaces that go to the SIP gateway. Interestingly, I can ping an IP on the SIP gateway (not used for media, but is pingable) in that static range (172.23.113.1) just fine from the 7609 (i.e. it's not getting routed to the corporate router). Unfortunately, the IP for the media endpoint on the SIP gateway is not pingable. Config for the 7609 is attached.
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Feb 5, 2012
I have a weird situation with some switches.
Switch .55 can ssh into Switch .57 but cannot ssh into Switch .56.
Switch 56 can ssh into Switch 55 and ssh into Switch 57
Switch 57 can ssh into Switch 55 and ssh into Switch 56
The software on .56 is:
C3560 Software (C3560-IPBASEK9-M), Version 12.2(55)SE3, RELEASE SOFTWARE (fc1)
I noticed on .56, when I do a show ip ssh I get: SSH Enabled - version 1.5. It doesn't say version 1.99 like the others even when I configure version 2. Is this a bug I am running into?
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Apr 16, 2012
We have instructed our user community to start their VPN sessions by connecting to our ASA 5520 with a browser to download (if necessary) and initiate the Anyconnect essentials VPN client. Everything was working fine until a few days ago.
We have had several people report the same problem. They connect with the browser, enter their login information and are greeted with our "authorized use only" message by the ASA. Then, instead of downloading (if necessary) and starting the VPN client software, the web page just goes back to the login prompt without displaying any error message. The client software is never downloaded or started.
We've been able to work around this by installing the client software manually (where necessary) and starting the VPN client from the start menu. However, this isn't our preferred solution because this method won't have them automatically picking up updated versions of the VPN client.
We have seen this behavior before when there was a pending Java update that had not been applied. However, that doesn't seem to be the case this time. Clients have recently updated to IE9, but I have personnally been running the Anyconnect client and launching through IE9 for months.
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Jan 30, 2012
Document at url... is quite interesting,One of these goes about the behavior of a switch (2960-S and 3750G) when QoS is not enabled vs the one when QoS is simply enabled with "mls qos".What additional commands, beside "mls qos", would be needed so as to simulate as accurately as possible the switch's behavior when QoS is not enabled?
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Aug 14, 2012
I configure multiple static RPs and one of the ACLs denies a source will it move on to the next entry that covers it in another acl? [code] i.e. 1.1.1.1 will be used as the RP for 224 to 238 and 2.2.2.2 will be used as the RP for 239.Will that work correctly, i.e. if a source is trying to register with the router and its for the group 239.1.1.1, will it be denied against the first RP and then permitted against the second RP?
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Apr 25, 2011
Does the E1000 router come with a default security setting upon installation using the supplied CD?
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Nov 14, 2011
Will ASA5510 support default route failover mechanism by giving two different AD value in the route outside command?
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Jul 12, 2011
I have another asa 5520 and it is configured. when i do factory default every thing erase. ok. when i enter again it promped for enable password. and it takes my privious password taht i gave in full configuration.
It generally comes no password . Why enable PW dont erase ? why factory default holds my previous password ?
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May 23, 2012
I'm having issues with NAT dropping ICMP on default NAT. Do I need to create another NAT for ICMP?
Here's the packet-tracer result:
firewall01# packet-tracer input inside icmp 172.23.1.74 0 10 8.8.8.8 detailed
Phase: 1
Type: ROUTE-LOOKUP
Subtype: input
Result: ALLOW
Config:
[code]....
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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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