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This document describes configuration of the FQDN feature (as of v6.3.0) to Firepower Management Center (FMC) and Firepower Threat Defense (FTD).
Cisco recommends that you have knowledge of these topics:
The information in this document is based on these software versions:
The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, ensure that you understand the potential impact of any command.
This document describes configuration of the Fully Qualified Domain Name (FQDN) feature introduced by software version 6.3.0 to Firepower Management Center (FMC) and Firepower Threat Defense (FTD).
This feature is present in the Cisco Adaptive Security Appliance (ASA) but it was not on the initial software releases of FTD.
Ensure these conditions are met before you configure FQDN objects:
This feature resolves a FQDN into an IP address and uses the latter to filter traffic when referenced by an Access Control Rule or Prefilter Policy.
Step 1. Configure the “DNS Server Group Object”
Retries—The number of times, from 0 to 10, to retry the list of DNS servers when the system does not receive a response. The default is 2.
Timeout—The number of seconds, from 1 to 30, before another try to the next DNS server. The default is 2 seconds. Each time the system retries the list of servers, this timeout doubles.
Step 2. Configure DNS (Platform Settings)
The expiry entry timer option specifies the time limit to remove the IP address of a resolved FQDN from the DNS lookup table after its Time-to-live (TTL) expires. Remove an entry requires the table to be recompiled, so frequent removals can increase the process load on the device. This setting virtually extends the TTL.
The poll timer option specifies the time limit after which the device queries the DNS server to resolve the FQDN that was defined in a network object group. An FQDN is resolved periodically either when the poll timer has expired, or when the TTL of the resolved IP entry has expired, whichever occurs first.
For Firepower Threat Defense 6.3.0 devices, if no interfaces are selected and the diagnostic interface is disabled for DNS lookup, the DNS resolution happens via any interface which includes the diagnostic interface (the command dnsdomain-lookup any is applied).
If you do not specify any interfaces—and do not enable DNS lookup on the diagnostic interface, the FTD uses the Data Routing Table to determine the interface. If there is no match, it uses the Management Routing Table.
If enabled, Firepower Threat Defense uses both the selected data interfaces and the diagnostic interface for DNS resolutions. Be sure to configure an IP address for the diagnostic interface on the Devices > Device Management > edit device > Interfaces page.
Step 3. Configure the Object Network FQDN
Navigate to Objects > Object Management, within a network object specify select the FQDN option.
Step 4. Create an Access Control Rule
Create a rule with the previous FQDN object and deploy the policy:
Note: The first instance of the FQDN resolution occurs when the FQDN object is deployed in an access control policy
Use this section to confirm your configuration works properly.
aleescob# show run dns DNS server-group DefaultDNS
aleescob# show run dns dns domain-lookup wan_1557 DNS server-group DNS_Test retries 3 timeout 5 name-server 172.31.200.100 domain-name aleescob.cisco.com DNS server-group DefaultDNS dns-group DNS_Test
object network obj-talosintelligence.com fqdn talosintelligence.com id 268434436
access-list CSM_FW_ACL_ remark rule-id 268434437: ACCESS POLICY: Aleescob_ACP - Mandatory access-list CSM_FW_ACL_ remark rule-id 268434437: L4 RULE: FQDN-ACL access-list CSM_FW_ACL_ advanced deny ip ifc lan_v1556 any ifc wan_1557 object obj-talosintelligence.com rule-id 268434437 event-log flow-start
# Start of AC rule. 268434437 deny 1 any any 2 any any any any (log dcforward flowstart) (dstfqdn 268434436) # End rule 268434437
Note: In this scenario, since the FQDN object was used for the destination, it is listed as dstfqdn.
aleescob# show dns Name: talosintelligence.com Address: 2001:DB8::6810:1b36 TTL 00:05:43 Address: 2001:DB8::6810:1c36 TTL 00:05:43 Address: 2001:DB8::6810:1d36 TTL 00:05:43 Address: 2001:DB8::6810:1a36 TTL 00:05:43 Address: 2001:DB8::6810:1936 TTL 00:05:43 Address: 192.168.27.54 TTL 00:05:43 Address: 192.168.29.54 TTL 00:05:43 Address: 192.168.28.54 TTL 00:05:43 Address: 192.168.26.54 TTL 00:05:43 Address: 192.168.25.54 TTL 00:05:43 aleescob# show fqdn FQDN IP Table: ip = 2001:DB8::6810:1b36, object = obj-talosintelligence.com, domain = talosintelligence.com FQDN-ID = 268434436 ip = 2001:DB8::6810:1c36, object = obj-talosintelligence.com, domain = talosintelligence.com FQDN-ID = 268434436 ip = 2001:DB8::6810:1d36, object = obj-talosintelligence.com, domain = talosintelligence.com FQDN-ID = 268434436 ip = 2001:DB8::6810:1a36, object = obj-talosintelligence.com, domain = talosintelligence.com FQDN-ID = 268434436 ip = 2001:DB8::6810:1936, object = obj-talosintelligence.com, domain = talosintelligence.com FQDN-ID = 268434436 ip = 192.168.27.54, object = obj-talosintelligence.com, domain = talosintelligence.com FQDN-ID = 268434436 ip = 192.168.29.54, object = obj-talosintelligence.com, domain = talosintelligence.com FQDN-ID = 268434436 ip = 192.168.28.54, object = obj-talosintelligence.com, domain = talosintelligence.com FQDN-ID = 268434436 ip = 192.168.26.54, object = obj-talosintelligence.com, domain = talosintelligence.com FQDN-ID = 268434436 ip = 192.168.25.54, object = obj-talosintelligence.com, domain = talosintelligence.com FQDN-ID = 268434436 FQDN ID Detail: FQDN-ID = 268434436, object = obj-talosintelligence.com, domain = talosintelligence.com ip = 2001:DB8::6810:1b36, 2001:DB8::6810:1c36, 2001:DB8::6810:1d36, 2001:DB8::6810:1a36, 2001:DB8::6810:1936, 192.168.27.54, 192.168.29.54, 192.168.28.54, 192.168.26.54, 192.168.25.54
firepower# show access-list
access-list CSM_FW_ACL_ line 10 advanced deny ip ifc lan_v1556 any ifc wan_1557 object obj-talosintelligence.com rule-id 268434437 event-log flow-start (hitcnt=0) 0x51d8505f access-list CSM_FW_ACL_ line 10 advanced deny ip ifc lan_v1556 any ifc wan_1557 fqdn talosintelligence.com (resolved) rule-id 268434437 event-log flow-start 0x1b869cf8 access-list CSM_FW_ACL_ line 10 advanced deny ip ifc lan_v1556 any ifc wan_1557 host 2001:DB8::6810:1b36 (talosintelligence.com) rule-id 268434437 event-log flow-start (hitcnt=0) 0x51d8505f access-list CSM_FW_ACL_ line 10 advanced deny ip ifc lan_v1556 any ifc wan_1557 host 2001:DB8::6810:1c36 (talosintelligence.com) rule-id 268434437 event-log flow-start (hitcnt=0) 0x51d8505f access-list CSM_FW_ACL_ line 10 advanced deny ip ifc lan_v1556 any ifc wan_1557 host 2001:DB8::6810:1d36 (talosintelligence.com) rule-id 268434437 event-log flow-start (hitcnt=0) 0x51d8505f access-list CSM_FW_ACL_ line 10 advanced deny ip ifc lan_v1556 any ifc wan_1557 host 2001:DB8::6810:1a36 (talosintelligence.com) rule-id 268434437 event-log flow-start (hitcnt=0) 0x51d8505f access-list CSM_FW_ACL_ line 10 advanced deny ip ifc lan_v1556 any ifc wan_1557 host 2001:DB8::6810:1936 (talosintelligence.com) rule-id 268434437 event-log flow-start (hitcnt=0) 0x51d8505f access-list CSM_FW_ACL_ line 10 advanced deny ip ifc lan_v1556 any ifc wan_1557 host 192.168.27.54 (talosintelligence.com) rule-id 268434437 event-log flow-start (hitcnt=0) 0x51d8505f access-list CSM_FW_ACL_ line 10 advanced deny ip ifc lan_v1556 any ifc wan_1557 host 192.168.29.54 (talosintelligence.com) rule-id 268434437 event-log flow-start (hitcnt=0) 0x51d8505f access-list CSM_FW_ACL_ line 10 advanced deny ip ifc lan_v1556 any ifc wan_1557 host 192.168.28.54 (talosintelligence.com) rule-id 268434437 event-log flow-start (hitcnt=0) 0x51d8505f access-list CSM_FW_ACL_ line 10 advanced deny ip ifc lan_v1556 any ifc wan_1557 host 192.168.26.54 (talosintelligence.com) rule-id 268434437 event-log flow-start (hitcnt=0) 0x51d8505f access-list CSM_FW_ACL_ line 10 advanced deny ip ifc lan_v1556 any ifc wan_1557 host 192.168.25.54 (talosintelligence.com) rule-id 268434437 event-log flow-start (hitcnt=0) 0x51d8505f
access-list CSM_FW_ACL_ line 10 advanced deny ip ifc lan_v1556 any ifc wan_1557 object obj-talosintelligence.com rule-id 268434437 event-log flow-start (hitcnt=4) 0x51d8505f access-list CSM_FW_ACL_ line 10 advanced deny ip ifc lan_v1556 any ifc wan_1557 fqdn talosintelligence.com (resolved) rule-id 268434437 event-log flow-start 0x1b869cf8 access-list CSM_FW_ACL_ line 10 advanced deny ip ifc lan_v1556 any ifc wan_1557 host 2001:DB8::6810:1b36 (talosintelligence.com) rule-id 268434437 event-log flow-start (hitcnt=0) 0x51d8505f access-list CSM_FW_ACL_ line 10 advanced deny ip ifc lan_v1556 any ifc wan_1557 host 2001:DB8::6810:1c36 (talosintelligence.com) rule-id 268434437 event-log flow-start (hitcnt=0) 0x51d8505f access-list CSM_FW_ACL_ line 10 advanced deny ip ifc lan_v1556 any ifc wan_1557 host 2001:DB8::6810:1d36 (talosintelligence.com) rule-id 268434437 event-log flow-start (hitcnt=0) 0x51d8505f access-list CSM_FW_ACL_ line 10 advanced deny ip ifc lan_v1556 any ifc wan_1557 host 2001:DB8::6810:1a36 (talosintelligence.com) rule-id 268434437 event-log flow-start (hitcnt=0) 0x51d8505f access-list CSM_FW_ACL_ line 10 advanced deny ip ifc lan_v1556 any ifc wan_1557 host 2001:DB8::6810:1936 (talosintelligence.com) rule-id 268434437 event-log flow-start (hitcnt=0) 0x51d8505f access-list CSM_FW_ACL_ line 10 advanced deny ip ifc lan_v1556 any ifc wan_1557 host 192.168.27.54 (talosintelligence.com) rule-id 268434437 event-log flow-start (hitcnt=4) 0x51d8505f access-list CSM_FW_ACL_ line 10 advanced deny ip ifc lan_v1556 any ifc wan_1557 host 192.168.29.54 (talosintelligence.com) rule-id 268434437 event-log flow-start (hitcnt=0) 0x51d8505f access-list CSM_FW_ACL_ line 10 advanced deny ip ifc lan_v1556 any ifc wan_1557 host 192.168.28.54 (talosintelligence.com) rule-id 268434437 event-log flow-start (hitcnt=0) 0x51d8505f access-list CSM_FW_ACL_ line 10 advanced deny ip ifc lan_v1556 any ifc wan_1557 host 192.168.26.54 (talosintelligence.com) rule-id 268434437 event-log flow-start (hitcnt=0) 0x51d8505f access-list CSM_FW_ACL_ line 10 advanced deny ip ifc lan_v1556 any ifc wan_1557 host 192.168.25.54 (talosintelligence.com) rule-id 268434437 event-log flow-start (hitcnt=0) 0x51d8505f
aleescob# show cap in 13 packets captured 1: 18:03:41.558915 192.168.56.132 > 172.31.200.100 icmp: 192.168.56.132 udp port 59396 unreachable 2: 18:04:12.322126 192.168.56.132 > 172.31.4.161 icmp: echo request 3: 18:04:12.479162 172.31.4.161 > 192.168.56.132 icmp: echo reply 4: 18:04:13.309966 192.168.56.132 > 172.31.4.161 icmp: echo request 5: 18:04:13.462149 172.31.4.161 > 192.168.56.132 icmp: echo reply 6: 18:04:14.308425 192.168.56.132 > 172.31.4.161 icmp: echo request 7: 18:04:14.475424 172.31.4.161> 192.168.56.132 icmp: echo reply 8: 18:04:15.306823 192.168.56.132 > 172.31.4.161 icmp: echo request 9: 18:04:15.463339 172.31.4.161 > 192.168.56.132 icmp: echo reply 10: 18:04:25.713662 192.168.56.132 > 192.168.27.54 icmp: echo request 11: 18:04:30.704232 192.168.56.132 > 192.168.27.54 icmp: echo request 12: 18:04:35.711480 192.168.56.132 > 192.168.27.54 icmp: echo request 13: 18:04:40.707528 192.168.56.132 > 192.168.27.54 icmp: echo request aleescob# sho cap asp | in 192.168.27.54 162: 18:04:25.713799 192.168.56.132 > 192.168.27.54 icmp: echo request 165: 18:04:30.704355 192.168.56.132 > 192.168.27.54 icmp: echo request 168: 18:04:35.711556 192.168.56.132 > 192.168.27.54 icmp: echo request 176: 18:04:40.707589 192.168.56.132 > 192.168.27.54 icmp: echo request
aleescob# sho cap in packet-number 10 trace 13 packets captured 10: 18:04:25.713662 192.168.56.132 > 192.168.27.54 icmp: echo request Phase: 1 Type: CAPTURE Subtype: Result: ALLOW Config: Additional Information: MAC Access list Phase: 2 Type: ACCESS-LIST Subtype: Result: ALLOW Config: Implicit Rule Additional Information: MAC Access list Phase: 3 Type: ROUTE-LOOKUP Subtype: Resolve Egress Interface Result: ALLOW Config: Additional Information: found next-hop 192.168.57.254 using egress ifc wan_1557 Phase: 4 Type: ACCESS-LIST Subtype: log Result: DROP Config: access-group CSM_FW_ACL_ global access-list CSM_FW_ACL_ advanced deny ip ifc lan_v1556 any ifc wan_1557 object obj-talosintelligence.com rule-id 268434437 event-log flow-start access-list CSM_FW_ACL_ remark rule-id 268434437: ACCESS POLICY: Aleescob_ACP - Mandatory access-list CSM_FW_ACL_ remark rule-id 268434437: L4 RULE: FQDN-ACL Additional Information:
Result: input-interface: lan_v1556 input-status: up input-line-status: up output-interface: wan_1557 output-status: up output-line-status: up Action: drop Drop-reason: (acl-drop) Flow is denied by configured rule
> system support firewall-engine-debug Please specify an IP protocol: icmp Please specify a client IP address: 192.168.56.132 Please specify a server IP address: Monitoring firewall engine debug messages 192.168.56.132-8 > 192.168.29.54-0 1 AS 1 I 0 new firewall session 192.168.56.132-8 > 192.168.29.54-0 1 AS 1 I 0 DAQ returned DST FQDN ID: 268434436 192.168.56.132-8 > 192.168.29.54-0 1 AS 1 I 0 Starting with minimum 2, 'FQDN-ACL', and SrcZone first with zones 1 -> 2, geo 0 -> 0, vlan 0, inline sgt tag: untagged, ISE sgt id: 0, svc 3501, payload 0, client 2000003501, misc 0, user 9999997, icmpType 8, icmpCode 0 192.168.56.132-8 > 192.168.29.54-0 1 AS 1 I 0 Match found for FQDN id: 268434436 192.168.56.132-8 > 192.168.29.54-0 1 AS 1 I 0 match rule order 2, 'FQDN-ACL', action Allow 192.168.56.132-8 > 192.168.29.54-0 1 AS 1 I 0 MidRecovery data sent for rule id: 268434437,rule_action:2, rev id:2096384604, rule_match flag:0x0 192.168.56.132-8 > 192.168.29.54-0 1 AS 1 I 0 allow action 192.168.56.132-8 > 192.168.29.54-0 1 AS 1 I 0 deleting firewall session
iab_mode Off # Start of tunnel and priority rules. # These rules are evaluated by LINA. Only tunnel tags are used from the matched rule id. 268434439 fastpath any any any any any any any any (log dcforward both) (tunnel -1) 268434438 allow any any 1025-65535 any any 3544 any 17 (tunnel -1) 268434438 allow any any 3544 any any 1025-65535 any 17 (tunnel -1) 268434438 allow any any any any any any any 47 (tunnel -1) 268434438 allow any any any any any any any 41 (tunnel -1) 268434438 allow any any any any any any any 4 (tunnel -1) # End of tunnel and priority rules.
Phase: 4 Type: ACCESS-LIST Subtype: log Result: ALLOW Config: access-group CSM_FW_ACL_ global access-list CSM_FW_ACL_ advanced trust ip any object obj-talosintelligence.com rule-id 268434439 event-log both access-list CSM_FW_ACL_ remark rule-id 268434439: PREFILTER POLICY: Prefilter-1 access-list CSM_FW_ACL_ remark rule-id 268434439: RULE: FQDN_Prefilter Additional Information:
All the logs needed are gathered from an FMC Troubleshoot. To gather all the important logs from FMC, run a Troubleshoot from the FMC GUI. Otherwise from a FMC Linux prompt, run sf_troubleshoot.pl. If you find an issue, please submit an FMC Troubleshoot with your report to the Cisco Technical Assistance Center (TAC).
FMC Logs
Log file name/location |
Purpose |
/opt/CSCOpx/MDC/log/operation/vmsshareddsvcs.log |
All API Calls |
/var/opt/CSCOpx/MDC/log/operation/usmsharedsvcs.log |
All API Calls |
/opt/CSCOpx/MDC/log/operation/vmsbesvcs.log |
CLI Generation Logs |
/opt/CSCOpx/MDC/tomcat/logs/stdout.log |
Tomcat Logs |
/var/log/mojo.log |
Mojo Logs |
/var/log/CSMAgent.log |
REST Calls between CSM & DC |
/var/log/action_queue.log |
DC’s Action Queue Log |
These are the errors/warnings shown in UI for FQDN and DNS server group object and DNS Settings:
Error/Warning |
Scenario |
Description |
Name contains invalid characters. Names must start with either alphabet or underscore and then either alphanumeric or special characters after. (-,_,+,.) |
User configures wrong name |
User is informed of the allowed characters and max range. |
Invalid default domain value |
User configures wrong domain name |
User is informed of the allowed characters and max range. |
No Interface Object has been selected for the DNS in platform setting ‘mzafeiro_Platform_Settings’. If proceeded, DNS domain-lookup is soon to happen on all interfaces |
User does not select any interface for domain lookup For a post-6.3 device |
User is warned that the DNS server group CLI is soon to get applied to all interfaces. |
No Interface Object has been selected for the DNS in platform setting ‘mzafeiro_Platform_Settings’. If proceeded, no DNS server-group with ‘DNS’ is soon to be applied |
User does not select any interface for domain lookup For a 6.2.3 device |
User is warned that the DNS server group CLI is not generated. |
When an FQDN is used in policy other than AC Policy/Prefilter policy, this error can occur and shown in the FMC UI:
1) Open logfile: /var/opt/CSCOpx/MDC/log/operation/usmsharedsvcs.log
2) Check for validation message similar to:
“Invalid network(s) configured. Networks [NetworksContainingFQDN] configured on the device(s)[DeviceNames] refer to FQDN”
3) Suggested action:
Verify if one or more of the below-mentioned policies are already configured with a FQDN or group which contains a FQDN object(s) and re-try the deployment of the same after those object(s) are removed.
a) Identity Policy
b) Variable Sets that contain a FQDN-applied to AC Policy
The system can show the next via the FTD CLI:
> show dns INFO: no activated FQDN
The DNS is not be activated until an object with a defined fqdn is applied. After an object is applied, this is resolved.
Q: Is Packet-tracer with FQDN a valid test to troubleshoot issues?
A: Yes, you can use fqdn option with packet-tracer.
Q: How often the FQDN rule updates the IP address of the server?
A: It depends on the TTL value of the DNS Response. Once the TTL value expires, the FQDN is resolved again with a new DNS query.
This also depends on the Poll Timer attribute defined in the DNS Server configuration. FQDN rule is resolved periodically when the Poll DNS timer has expired or when the TTL of the resolved IP entry has expired, whichever comes first.
Q: Does this work for round-robin DNS?
A: Round-robin DNS work seamlessly as this feature works on the FMC/FTD with the use of a DNS client and the round-robin DNS configuration is on the DNS server side.
Q: Is there a limitation for the low TTL DNS values?
A: If a DNS response comes with 0 TTL, the FTD device adds 60 seconds to it. In this case, the TTL value is minimum 60 seconds.
Q: So by default the FTD keeps the default value of 60 seconds?
A: The user can always override the TTL with Expire Entry Timer setting on DNS Server.
Q: How it interoperates with anycast DNS responses? For example, DNS servers can provide different IP addresses based on geolocation to requesters. Is it possible to request all IP addresses for a FQDN? Like the dig command on Unix?
A: Yes, if FQDN is able to resolve multiple IP addresses, all are be pushed to the device and the AC rule expands accordingly.
Q: Are there plans to include a preview option that shows the commands is pushed before any depoloment change?
A: This is part of the Preview config option available via Flex config. Preview is already there, but it is hidden in Flex Config policy. There is a plan to move it out and make it generic.
Q: Which interface on the FTD is used to perform the DNS lookup?
A: It is configurable. When no interfaces are configured, all named interfaces on FTD are enabled for the DNS lookup.
Q: Does each managed NGFW perform its own DNS resolution and FQDN IP translation separately even when the same Access Policy is applied on all of them with the same FQDN object?
A: Yes.
Q: Can the DNS cache be cleared for FQDN ACLs to troubleshoot?
A: Yes, you can perform the clear dns and clear dns-hosts cache commands on the device.
Q: When exactly the FQDN resolution is triggered?
A: FQDN resolution happens when the FQDN object is deployed in an AC policy.
Q: Is it possible to purge the cache only for a single site?
A: Yes. If you know the domain name or IP address then you can clear it, but there is no command as such per ACL perspective. For example, the clear dns host agni.tejas.com command is present to clear the cache on host by host basis with the keyword host as in dns host agni.tejas.com.
Q: Is it possible to use wildcards, like *.microsoft.com?
A: No. FQDN must begin and end with a digit or letter. Only letters, digits, and hyphens are allowed as internal characters.
Q: Is name resolution performed at AC compilation time and not at the time of the first or subsequent requests? If we hit low TTL (less than AC compilation time, fast-flux or something else), can some IP addresses be missed?
A: Name resolution happens as soon as the AC policy is deployed. As per the TTL time expiry, the renewal ensues.
Q: Are there plans to be able to process Microsoft Office 365 cloud IP addresses (XML) list?
A: This is not supported at this time.
Q: Is FQDN available in SSL Policy?
A: Not for now (software version 6.3.0). FQDN objects are only supported in source and destination network for AC policy only.
Q: Are there any historic logs that can provide information about resolved FQDNs? Like LINA syslogs, for example.
A: To troubleshoot the FQDN to a particular destination, you can use the system support trace command. The traces show the FQDN ID of the packet. You can compare the ID to troubleshoot. You can also enable Syslog messages 746015, 746016 to track the FQDN dns resolution activity.
Q: Does the device log FQDN in connections table with resolved IP?
A: To troubleshoot the FQDN to a particular destination, you can use the system support trace command, where the traces show the FQDN ID of the packet. You can compare the ID to troubleshoot. There are plans to have FQDN logs in the event viewer on FMC in the future.
Q: What are the shortcomings of FQDN rule feature?
A: The feature does not scale if the FQDN rule is used on a destination that changes IP address frequently (for example: internet servers that have TTL expiry of zero), workstations can end up having new IP addresses that no longer match with the FTD DNS cache. As a result, it does not match the ACP rule. By default, the FTD adds 1 minute on top of the received TTL expiry from the DNS response and cannot be set to zero. On these conditions, it is highly recommended to use the URL Filtering feature that is best suited for this use case.
Revision | Publish Date | Comments |
---|---|---|
3.0 |
31-May-2024 |
Recertification |
1.0 |
04-Aug-2019 |
Initial Release |