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    In this guide, we will identify some of the possible causes that might activate the asa debug access list and then suggest possible solutions that you can try to resolve this issue.


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    High Is there a way to debug the Zu asa firewall rules application?I created a set of simple access rules: any allow ICMP and any allow UDP.First
    once it’s up and running, I can ping. UDP doesn’t work. Running a real trace (simulated packet) in asdm shows that the packet was dropped by the implicit drop rule, but I don’t understand why that is, and never matches my udp rule. Can I enable rule evaluation logging?

    debug access list asa

    Here is a golf config element that I think is quite relevant (sorry, I’m not a Cisco expert using ASDM):

    access-list tunnel Split default ACL for list external_access_in extended allow icmp any anychecking access noteslist to access list external_access_in external_access_in Destiny UDP authorization extended to host x.x.x.x y.y.y.y

    I also try to replace x.x.x.x and y.y.y.y with each of the values.A packet trace indicating that the packet can be rejected by an implicit deny rule associated with the access check phase.The icmp strategy works.

     Result "commanddu effort: packet tracer disabled x udp.x.x.x 5060 y.y.y.y 5060 verbose"Phase: SEARCH 1Type: ROUTESubtype : ALLOWtune:Additional inputresult: info:inside outside2nd stepType:Result: access listSubtype: DROPtune:implicit ruleFurther information: Forward flow based on the Lookup Yields rule: at id=0xad31d370, priority=111, domain=allowed, denied=true    hits=28380, user_data=0x0, flags=0x4000, protocol=0 cs_id=0x0, source ip/id=, mask=, port=0  dst ip/id=, mask=, port=0, dscp=0x0    input_ifc=open, output_ifc=openResults:Input interface: openInput status: highInput line status: highOutput interface: openExit Status: HighOutput line status: upAction: ThrowReason for deletion: (acl-drop) thread rejected by configured rule

    Access list ACL cached log total flows: 0, denied 8 (deny-flow-max 4096)            Access Alert Interval 300List Split Tunnel ACL; 1 PC.; Brand hash: 0xaa04f5f3Tunnel Split Line Access List ACL 1 Generic Xxx Authorization.xx5.0.0 (hitcnt=6240) 0x9439a34baccess list external_access_in; piece 2.; Name hash: 0x6892a938access list external_access_in string Advanced 1 trust icmp all all (hitcnt=0) 0x71af81e1access list external_access_in binding 2 remarks testaccess list external_access_in sequence 3 auth realm Udp coordinator x.x.x.x host y.y.y.y (hitcnt=0) inside_nat0_outbound; 0x9fbf7dc7access list to some Hash elements; on behalf of: 0x467c8ce4access list inside_nat0_outbound phrase 1 extended permission ip toy city network object remote-mgmt-pool 0x1c53e4c4 access list inside_nat0_outbound line 1 extended IP allowed xxx.xx5.0.0 (hitcnt=0) 0x1c53e4c4access list inside_nat0_outbound line 2 facilitates extended IP object City network object City2-network 0x278c6c43  access list inside_nat0_outbound internet 2 allowed extended IP xxx.xx5.0.0 xxx.xx2.0.0 (hitcnt=0) 0x278c6c43Access List inside_nat0_outbound Any Line Permit Extended IP City Concept Network City1 Object Network 0x2b77c336  access list inside_nat0_outbound 3 lines extended license Xxx ip.xx5.0.0 xxx.xx1.0.0 0x2b77c336Access list (hitcnt=0) inside_nat0_outbound line 4 elevated resolution city-network ip-object object city3-network list 0x9fdd4c28 inside_nat0_outbound pipe 4 access is allowed No extended IP xxx.xx5.0.0 xxx.xx5.0.0 255.255.0.(hitcnt=0) 0 0x9fdd4c283-item access list; external_cryptomap; Name hash: 0x39bea18fAccess list external_cryptomap Course 1 Extended permission Xxx internet.xx5.0.0 City1 Network 0x12693b9a object access list external_cryptomap license line 1 extended IP xxx.xx5.0.0 xxx.xx1.0.0 (hitcnt=265) 0x12693b9aaccess list inside_nat_outbound; 1 PC.; Concept hash: 0xb64b365aaccess list line 1 inside_nat_outbound tcp area authorization object metro network each smtp eq 0x4c753adf  accesslist carefully thread 1 inside_nat_outbound tcp realm permission xxx.xx5.0.0 any smtp eq (hitcnt=0) 0x4c753adflist external_cryptomap_1; access to 1 element; Topic Hash: 0x759febfaAccess List external_cryptomap_1 Line 1 Internet Protocol Address Claim Extended Object Metropolitan Network Metropolitan Object 0x4b257004  Access list external_cryptomap_1 Line 10 Extended IP address allocation xxx.xx5.0.0 xxx.xx5.0.0 255.255.0.(hitcnt=0) 0 0x4b257004single access list external_cryptomap_2; Elements; Name hash: 0x4e1c27f3access list 1 insert external_cryptomap_2 extended authorization IP address xxx.xx5.0.0 city4 idea network 0xa82be620 Access list external_cryptomap_2 line Extended 1 available IP xxx.xx5.0.0 xxx.xx3.0.0 (hitcnt=25) 0xa82be620

    debug access list asa

    I know this position is stuffy, it’s actually quite simple. Many of those who deal with environments have implicit access control lists and permissions because it must have been too much work to create a list of requirements that could interact with anything before firewalls put them in place.< /p>>

    So you’ve applied a very nice access control list to the interface, because you should allow everything. The goal is to allow nothing and break the individual allow rule only so that we can change it to a deny rule. Inside Asdm it should look like this.

    What exactly is in this access control list, why can I start breaking some rules and writing freelancers?

    Now, if you right-click on an ACL in ASDM, you’ll get this nice helper called View Log…. If you click on that option, you still won’t see most of the stuff. First,

    All I want to help you with is enable debug logging for ASDM. SoThus, I don’t have to change anything when I open the log viewer or go back to view the hits in the ACL.

    In Configuration -> Logging -> Logging Filters -> Logging Filter asdm by Severity select Debug

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