We're Sorry, Full Content Access is for Members Only...

If you like to keep on reading, Become a Member Now! Here is Why:

  • Learn any CCNA, CCNP and CCIE R&S Topic. Explained As Simple As Possible.
  • [geot exclude_region="No Trial" ] Try for Just $1. The Best Dollar You've Ever Spent on Your Cisco Career![/geot]
  • Full Access to our 541 Lessons. More Lessons Added Every Week!
  • Content created by Rene Molenaar (CCIE #41726)

 

288 New Members signed up the last 30 days!

 
satisfaction-guaranteed

100% Satisfaction Guaranteed!
You may cancel your monthly membership at any time.
No Questions Asked!

Tags:


Notable Replies

  1. Hello,

    I do not understand the difference of the object nat and the regular nat, can you explain that to me?

  2. Hi Alfredo,

    The ASA (since 8.3) has different NAT "sections":


    • 1:Manual

    • 2: Auto

    • 3: "after auto" Manual
    • The ASA will first process NAT rules in section 1, then 2 and finally 3.

      Here's an example of manual NAT:

    ASA(config)# object network INTERNAL_SERVER
    ASA(config-network-object)# host 192.168.1.1
    
    ASA(config)# object network PUBLIC_IP
    ASA(config-network-object)# host 1.1.1.1
    
    ASA(config)# nat (INSIDE,OUTSIDE) source static INTERNAL_SERVER PUBLIC_IP

    The NAT rule has been configured globally, this section 1 rule is preferred over 2 and 3.

    Here's an example for Auto NAT:

    ASA(config)# object network LAN
    ASA(config-network-object)# subnet 192.168.1.0 255.255.255.0
    ASA(config-network-object)# nat (INSIDE,OUTSIDE) static PUBLIC_IP

    Above we configured NAT in the network object, this is a section 2 rule.

    Last but not least, we have your rule:

    ASA(config)# nat (INSIDE,OUTSIDE) after-auto 1 source dynamic any interface

    This section 3 rule will be processed after 1 and 2.

    The rule above is a general rule to translate all source addresses on the inside to the IP address of your outside interface. It might be a good idea to process this NAT rule last since it allows you to put more specific NAT rules in section 1 or 2.

    Both options will get you the same result (if you don't have any other NAT rules). The first one is processed in section 2, the other one in section 3.

    Hope this helps.

    Rene

  3. 9Hi Jaun

    Had a answer thought of answering you

    Networking base line is send from the source and receive back from destination

    When you do PING from inside(LAN) the echo request packet from inside interface (higher security level 100) goes to the outside(lower security level 0) and later when the echo reply back to outside interface(lower security level)going to inside interface ASA does not allow this.

    Traffic from lower security level interface to higher not allowed by default (use access list or add protocol to inspection engine)
    Traffic from higher security level to lower allowed by default (without any access-list)

  4. Hi

    Can someone help cant figure out why my internal ip address wont get nat'ed

    R1 IOS 
    !
    hostname Router
    !
    boot-start-marker
    boot-end-marker
    !
    !
    !
    no aaa new-model
    ethernet lmi ce
    !
    !
    !
    mmi polling-interval 60
    no mmi auto-configure
    no mmi pvc
    mmi snmp-timeout 180
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    ip cef
    no ipv6 cef
    !
    multilink bundle-name authenticated
    !
    !
    !
    !
    !
    redundancy
    !
    !
    ! 
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    interface GigabitEthernet0/0
     no ip address
     shutdown
     duplex auto
     speed auto
     media-type rj45
    !
    interface GigabitEthernet0/1
     ip address 192.168.1.1 255.255.255.0
     duplex auto
     speed auto
     media-type rj45
    !
    ip forward-protocol nd
    !
    !
    no ip http server
    no ip http secure-server
    !
    !
    !
    !
    control-plane
    !
    banner exec ^C
    **************************************************************************
    * IOSv is strictly limited to use for evaluation, demonstration and IOS  *
    * education. IOSv is provided as-is and is not supported by Cisco's      *
    * Technical Advisory Center. Any use or disclosure, in whole or in part, *
    * of the IOSv Software or Documentation to any third party for any       *
    * purposes is expressly prohibited except as otherwise authorized by     *
    * Cisco in writing.                                                      *
    **************************************************************************^C
    banner incoming ^C
    **************************************************************************
    * IOSv is strictly limited to use for evaluation, demonstration and IOS  *
    * education. IOSv is provided as-is and is not supported by Cisco's      *
    * Technical Advisory Center. Any use or disclosure, in whole or in part, *
    * of the IOSv Software or Documentation to any third party for any       *
    * purposes is expressly prohibited except as otherwise authorized by     *
    * Cisco in writing.                                                      *
    **************************************************************************^C
    banner login ^C
    **************************************************************************
    * IOSv is strictly limited to use for evaluation, demonstration and IOS  *
    * education. IOSv is provided as-is and is not supported by Cisco's      *
    * Technical Advisory Center. Any use or disclosure, in whole or in part, *
    * of the IOSv Software or Documentation to any third party for any       *
    * purposes is expressly prohibited except as otherwise authorized by     *
    * Cisco in writing.                                                      *
    **************************************************************************^C
    !
    line con 0
    line aux 0
    line vty 0 4
     login
     transport input none
    !
    no scheduler allocate
    !
    end

    -

    R2 
    Building configuration...
    
    Current configuration : 2741 bytes
    !
    ! Last configuration change at 10:21:34 UTC Wed Mar 1 2017
    !
    version 15.6
    service timestamps debug datetime msec
    service timestamps log datetime msec
    no service password-encryption
    !
    hostname Router
    !
    boot-start-marker
    boot-end-marker
    !
    !
    !
    no aaa new-model
    ethernet lmi ce
    !
    !
    !
    mmi polling-interval 60
    no mmi auto-configure
    no mmi pvc
    mmi snmp-timeout 180
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    ip cef
    no ipv6 cef
    !
    multilink bundle-name authenticated
    !
    !
    !
    !
    !
    redundancy
    !
    !
    ! 
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    !
    interface GigabitEthernet0/0
     no ip address
     shutdown
     duplex auto
     speed auto
     media-type rj45
    !
    interface GigabitEthernet0/1
     ip address 192.168.2.2 255.255.255.0
     duplex auto
     speed auto
     media-type rj45
    !
    ip forward-protocol nd
    !
    !
    no ip http server
    no ip http secure-server
    !
    !
    !
    !
    control-plane
    !
    banner exec ^C
    **************************************************************************
    * IOSv is strictly limited to use for evaluation, demonstration and IOS  *
    * education. IOSv is provided as-is and is not supported by Cisco's      *
    * Technical Advisory Center. Any use or disclosure, in whole or in part, *
    * of the IOSv Software or Documentation to any third party for any       *
    * purposes is expressly prohibited except as otherwise authorized by     *
    * Cisco in writing.                                                      *
    **************************************************************************^C
    banner incoming ^C
    **************************************************************************
    * IOSv is strictly limited to use for evaluation, demonstration and IOS  *
    * education. IOSv is provided as-is and is not supported by Cisco's      *
    * Technical Advisory Center. Any use or disclosure, in whole or in part, *
    * of the IOSv Software or Documentation to any third party for any       *
    * purposes is expressly prohibited except as otherwise authorized by     *
    * Cisco in writing.                                                      *
    **************************************************************************^C
    banner login ^C
    **************************************************************************
    * IOSv is strictly limited to use for evaluation, demonstration and IOS  *
    * education. IOSv is provided as-is and is not supported by Cisco's      *
    * Technical Advisory Center. Any use or disclosure, in whole or in part, *
    * of the IOSv Software or Documentation to any third party for any       *
    * purposes is expressly prohibited except as otherwise authorized by     *
    * Cisco in writing.                                                      *
    **************************************************************************^C
    !
    line con 0
    line aux 0
    line vty 0 4
     login
     transport input none
    !
    no scheduler allocate
    !
    end

    -

    ASA 
    
    : 
    : Serial Number: 9AQC5RW23DD
    : Hardware:   ASAv, 2048 MB RAM, CPU Pentium II 3504 MHz
    :
    ASA Version 9.5(2)204 
    !
    hostname ciscoasa
    enable password 8Ry2YjIyt7RRXU24 encrypted
    xlate per-session deny tcp any4 any4
    xlate per-session deny tcp any4 any6
    xlate per-session deny tcp any6 any4
    xlate per-session deny tcp any6 any6
    xlate per-session deny udp any4 any4 eq domain
    xlate per-session deny udp any4 any6 eq domain
    xlate per-session deny udp any6 any4 eq domain
    xlate per-session deny udp any6 any6 eq domain
    names
    !
    interface GigabitEthernet0/0
     nameif INSIDE
     security-level 100
     ip address 192.168.1.254 255.255.255.0 
    !
    interface GigabitEthernet0/1
     nameif OUTSIDE
     security-level 0
     ip address 192.168.2.254 255.255.255.0 
    !
    interface Management0/0
     shutdown
     no nameif
     no security-level
     no ip address
    !
    ftp mode passive
    object network PUBLIC_POOL
     range 192.168.2.100 192.168.2.200
    object network INTERNAL
     range 192.168.1.0 255.255.255.0
    pager lines 23
    mtu INSIDE 1500
    mtu OUTSIDE 1500
    no failover
    icmp unreachable rate-limit 1 burst-size 1
    no asdm history enable
    arp timeout 14400
    no arp permit-nonconnected
    !
    object network INTERNAL
     nat (INSIDE,OUTSIDE) dynamic PUBLIC_POOL
    timeout xlate 3:00:00
    timeout pat-xlate 0:00:30
    timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 sctp 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 0:05:00 absolute
    timeout tcp-proxy-reassembly 0:01:00
    timeout floating-conn 0:00:00
    user-identity default-domain LOCAL
    no snmp-server location
    no snmp-server contact
    crypto ipsec security-association pmtu-aging infinite
    crypto ca trustpoint _SmartCallHome_ServerCA
     no validation-usage
     crl configure
    crypto ca trustpool policy
     auto-import
    crypto ca certificate chain _SmartCallHome_ServerCA
     certificate ca 6ecc7aa5a7032009b8cebcf4e952d491
        308205ec 308204d4 a0030201 0202106e cc7aa5a7 032009b8 cebcf4e9 52d49130 
        0d06092a 864886f7 0d010105 05003081 ca310b30 09060355 04061302 55533117 
        30150603 55040a13 0e566572 69536967 6e2c2049 6e632e31 1f301d06 0355040b 
        13165665 72695369 676e2054 72757374 204e6574 776f726b 313a3038 06035504 
        0b133128 63292032 30303620 56657269 5369676e 2c20496e 632e202d 20466f72 
        20617574 686f7269 7a656420 75736520 6f6e6c79 31453043 06035504 03133c56 
        65726953 69676e20 436c6173 73203320 5075626c 69632050 72696d61 72792043 
        65727469 66696361 74696f6e 20417574 686f7269 7479202d 20473530 1e170d31 
        30303230 38303030 3030305a 170d3230 30323037 32333539 35395a30 81b5310b 
        30090603 55040613 02555331 17301506 0355040a 130e5665 72695369 676e2c20 
        496e632e 311f301d 06035504 0b131656 65726953 69676e20 54727573 74204e65 
        74776f72 6b313b30 39060355 040b1332 5465726d 73206f66 20757365 20617420 
        68747470 733a2f2f 7777772e 76657269 7369676e 2e636f6d 2f727061 20286329 
        3130312f 302d0603 55040313 26566572 69536967 6e20436c 61737320 33205365 
        63757265 20536572 76657220 4341202d 20473330 82012230 0d06092a 864886f7 
        0d010101 05000382 010f0030 82010a02 82010100 b187841f c20c45f5 bcab2597 
        a7ada23e 9cbaf6c1 39b88bca c2ac56c6 e5bb658e 444f4dce 6fed094a d4af4e10 
        9c688b2e 957b899b 13cae234 34c1f35b f3497b62 83488174 d188786c 0253f9bc 
        7f432657 5833833b 330a17b0 d04e9124 ad867d64 12dc744a 34a11d0a ea961d0b 
        15fca34b 3bce6388 d0f82d0c 948610ca b69a3dca eb379c00 48358629 5078e845 
        63cd1941 4ff595ec 7b98d4c4 71b350be 28b38fa0 b9539cf5 ca2c23a9 fd1406e8 
        18b49ae8 3c6e81fd e4cd3536 b351d369 ec12ba56 6e6f9b57 c58b14e7 0ec79ced 
        4a546ac9 4dc5bf11 b1ae1c67 81cb4455 33997f24 9b3f5345 7f861af3 3cfa6d7f 
        81f5b84a d3f58537 1cb5a6d0 09e4187b 384efa0f 02030100 01a38201 df308201 
        db303406 082b0601 05050701 01042830 26302406 082b0601 05050730 01861868 
        7474703a 2f2f6f63 73702e76 65726973 69676e2e 636f6d30 12060355 1d130101 
        ff040830 060101ff 02010030 70060355 1d200469 30673065 060b6086 480186f8 
        45010717 03305630 2806082b 06010505 07020116 1c687474 70733a2f 2f777777 
        2e766572 69736967 6e2e636f 6d2f6370 73302a06 082b0601 05050702 02301e1a 
        1c687474 70733a2f 2f777777 2e766572 69736967 6e2e636f 6d2f7270 61303406 
        03551d1f 042d302b 3029a027 a0258623 68747470 3a2f2f63 726c2e76 65726973 
        69676e2e 636f6d2f 70636133 2d67352e 63726c30 0e060355 1d0f0101 ff040403 
        02010630 6d06082b 06010505 07010c04 61305fa1 5da05b30 59305730 55160969 
        6d616765 2f676966 3021301f 30070605 2b0e0302 1a04148f e5d31a86 ac8d8e6b 
        c3cf806a d448182c 7b192e30 25162368 7474703a 2f2f6c6f 676f2e76 65726973 
        69676e2e 636f6d2f 76736c6f 676f2e67 69663028 0603551d 11042130 1fa41d30 
        1b311930 17060355 04031310 56657269 5369676e 4d504b49 2d322d36 301d0603 
        551d0e04 1604140d 445c1653 44c1827e 1d20ab25 f40163d8 be79a530 1f060355 
        1d230418 30168014 7fd365a7 c2ddecbb f03009f3 4339fa02 af333133 300d0609 
        2a864886 f70d0101 05050003 82010100 0c8324ef ddc30cd9 589cfe36 b6eb8a80 
        4bd1a3f7 9df3cc53 ef829ea3 a1e697c1 589d756c e01d1b4c fad1c12d 05c0ea6e 
        b2227055 d9203340 3307c265 83fa8f43 379bea0e 9a6c70ee f69c803b d937f47a 
        6decd018 7d494aca 99c71928 a2bed877 24f78526 866d8705 404167d1 273aeddc 
        481d22cd 0b0b8bbc f4b17bfd b499a8e9 762ae11a 2d876e74 d388dd1e 22c6df16 
        b62b8214 0a945cf2 50ecafce ff62370d ad65d306 4153ed02 14c8b558 28a1ace0 
        5becb37f 954afb03 c8ad26db e6667812 4ad99f42 fbe198e6 42839b8f 8f6724e8 
        6119b5dd cdb50b26 058ec36e c4c875b8 46cfe218 065ea9ae a8819a47 16de0c28 
        6c2527b9 deb78458 c61f381e a4c4cb66
      quit
    telnet timeout 5
    ssh stricthostkeycheck
    ssh timeout 5
    ssh key-exchange group dh-group1-sha1
    console timeout 0
    threat-detection basic-threat
    threat-detection statistics access-list
    no threat-detection statistics tcp-intercept
    dynamic-access-policy-record DfltAccessPolicy
    !
    class-map inspection_default
     match default-inspection-traffic
    !
    !
    policy-map type inspect dns migrated_dns_map_1
     parameters
      message-length maximum client auto
      message-length maximum 512
    policy-map global_policy
     class inspection_default
      inspect dns migrated_dns_map_1 
      inspect ftp 
      inspect h323 h225 
      inspect h323 ras 
      inspect ip-options 
      inspect netbios 
      inspect rsh 
      inspect rtsp 
      inspect skinny  
      inspect esmtp 
      inspect sqlnet 
      inspect sunrpc 
      inspect tftp 
      inspect sip  
      inspect xdmcp 
    !
    service-policy global_policy global
    prompt hostname context 
    call-home reporting anonymous prompt 2
    call-home
     profile License
      destination address http https://tools.cisco.com/its/service/oddce/services/DDCEService
      destination transport-method http
     profile CiscoTAC-1
      no active
      destination address http https://tools.cisco.com/its/service/oddce/services/DDCEService
      destination address email callhome@cisco.com
      destination transport-method http
      subscribe-to-alert-group diagnostic
      subscribe-to-alert-group environment
      subscribe-to-alert-group inventory periodic monthly
      subscribe-to-alert-group configuration periodic monthly
      subscribe-to-alert-group telemetry periodic daily
    Cryptochecksum:37800462eea240bb1047046b615be618
    : end

    I think i followed the lesson correctly but it just wont work

    Thanks

    Simon

Continue the discussion forum.networklessons.com

14 more replies

Participants