the NAT ID processing order

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  Hi people,

  I am preparing to a test lab and have the following scenario:

  R6---172.16.50/24---PIX---172.16.10/24--R1

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  lo0 6.6.6.6/24

  FA0/1 172.16.50.50/24

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  Type to abort escape sequence.

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  > 1.1.1.1 (8/0), 4 packs

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  I wonder why the decrypted packets are denied by the ACL. I expect that the ACL is processed BEFORE the packet is decrypted. When I look at the meter on the hit of the ACL, it seems that the ACL is checked twice.

  Someone at - it an idea on the exact order of encryption and the treatment of the ACL?

  Thank you

  Michael

  Attached you will find the configs of the R1 and R6

  Michael

  I recently saw an explanation of encryption and ACLs that indicates there has recently been a change in behavior. In most versions of IOS, the behavior is as you describe, the package is evaluated by the ACL twice. The explanation is that the package is evaluated first in his State encrypted to check that it was something that must be dealt with. After the package has been decrypted, the IOS necessary to assess the package decrypted to see if things like the quality of Service necessary to apply. So basically the decrypted packet passed through the interface again and the ACL again. In recent versions of the code (12.3 (4) T, if memory serves) a change has been made and the package will now go through the ACL only once.

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• Disable the NAT for VPN site-to-site

  Hello world

  I work in a company, and we had to make a VPN site-to site.

  Everything works fine, except that the packages sent to my site are translated, in other words: the firewall on the other site (site_B) see only the IP address of my firewall (Site_A).

  I tried to solve the problem, but without success, I think that natives of VPN packets is the problem.

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  ASA Version 8.3(2)
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  enable password 9U./y4ITpJEJ8f.V encrypted
  passwd 2KFQnbNIdI.2KYOU encrypted
  names
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  nameif inside
  security-level 100
  ip address 192.168.67.254 255.255.255.0
  !
  interface Vlan2
  nameif outside
  security-level 0
  ip address 41.220.X.Y 255.255.255.252 (External WAN public IP Address)
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  switchport access vlan 2
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  interface Ethernet0/1
  !
  interface Ethernet0/2
  !
  interface Ethernet0/3
  !
  interface Ethernet0/4
  !
  interface Ethernet0/5
  !
  interface Ethernet0/6
  !
  interface Ethernet0/7
  !
  ftp mode passive
  clock timezone CET 1
  object network obj_any
  subnet 0.0.0.0 0.0.0.0
  object network 41.220.X1.Y1
  host 41.220.X1.Y1
  
  object network NETWORK_OBJ_192.168.67.0_24
  subnet 192.168.67.0 255.255.255.0
  object network NETWORK_OBJ_172.19.32.0_19
  subnet 172.19.32.0 255.255.224.0
  object network 194.2.176.18
  host 194.2.XX.YY (External IP address public of the other site (Site_B))
  description 194.2.XX.YY
  access-list inside_access_in extended permit ip any any log warnings
  access-list inside_access_in extended permit ip object NETWORK_OBJ_172.19.32.0_19 object NETWORK_OBJ_192.168.67.0_24 log debugging
  access-list inside_access_in extended permit ip object 194.2.176.18 any log debugging
  access-list inside_access_in extended permit ip any object NETWORK_OBJ_172.19.32.0_19 log debugging
  access-list outside_1_cryptomap extended permit ip 192.168.67.0 255.255.255.0 172.19.32.0 255.255.224.0 log debugging
  access-list outside_1_cryptomap extended permit ip any object NETWORK_OBJ_172.19.32.0_19 log debugging
  access-list 1111 standard permit 172.19.32.0 255.255.224.0
  access-list 1111 standard permit 192.168.67.0 255.255.255.0
  access-list outside_1_cryptomap_1 extended permit ip 172.19.32.0 255.255.224.0 any log debugging
  access-list outside_1_cryptomap_1 extended permit ip any object NETWORK_OBJ_172.19.32.0_19 log debugging
  access-list outside_1_cryptomap_2 extended permit ip 192.168.67.0 255.255.255.0 172.19.32.0 255.255.224.0 log debugging
  access-list outside_1_cryptomap_2 extended permit ip any object NETWORK_OBJ_172.19.32.0_19 log debugging
  access-list outside_access_in extended permit ip any any log warnings
  access-list outside_access_in extended permit ip object 194.2.XX.YY any log debugging
  access-list outside_access_in extended permit ip any object NETWORK_OBJ_172.19.32.0_19 log debugging
  access-list nonat extended permit ip 192.168.67.0 255.255.255.0 176.19.32.0 255.255.224.0
  access-list nonat extended permit ip 192.168.67.0 255.255.255.0 172.19.32.0 255.255.224.0
  pager lines 24
  logging enable
  logging monitor informational
  logging asdm warnings
  mtu inside 1500
  mtu outside 1500
  icmp unreachable rate-limit 1 burst-size 1
  icmp permit any inside
  icmp permit any outside
  no asdm history enable
  arp timeout 14400
  nat (inside,outside) source dynamic any interface
  nat (inside,outside) source static NETWORK_OBJ_192.168.67.0_24 NETWORK_OBJ_192.168.67.0_24 destination static NETWORK_OBJ_172.19.32.0_19 NETWORK_OBJ_172.19.32.0_19
  access-group inside_access_in in interface inside
  access-group outside_access_in in interface outside
  route outside 0.0.0.0 0.0.0.0 41.220.X.Y 1
  timeout xlate 3:00:00
  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 0:05:00 absolute
  timeout tcp-proxy-reassembly 0:01:00
  dynamic-access-policy-record DfltAccessPolicy
  aaa authentication ssh console LOCAL
  aaa authentication telnet console LOCAL
  http server enable
  http 192.168.67.0 255.255.255.0 inside
  http 0.0.0.0 0.0.0.0 outside
  no snmp-server location
  no snmp-server contact
  snmp-server enable traps snmp authentication linkup linkdown coldstart
  crypto ipsec transform-set ESP-DES-MD5 esp-des esp-md5-hmac
  crypto ipsec transform-set ESP-DES-SHA esp-des esp-sha-hmac
  crypto ipsec security-association lifetime seconds 28800
  crypto ipsec security-association lifetime kilobytes 4608000
  crypto dynamic-map SYSTEM_DEFAULT_CRYPTO_MAP 65535 set transform-set ESP-DES-MD5
  crypto map outside_map 1 match address outside_1_cryptomap_2
  crypto map outside_map 1 set peer 194.2.XX.YY
  crypto map outside_map 1 set transform-set ESP-DES-MD5
  crypto map outside_map 65535 ipsec-isakmp dynamic SYSTEM_DEFAULT_CRYPTO_MAP
  crypto map outside_map interface outside
  crypto map inside_map 65535 ipsec-isakmp dynamic SYSTEM_DEFAULT_CRYPTO_MAP
  crypto map inside_map interface inside
  crypto isakmp enable inside
  crypto isakmp enable outside
  crypto isakmp policy 10
  authentication pre-share
  encryption des
  hash md5
  group 2
  lifetime 86400
  telnet 192.168.67.200 255.255.255.255 inside
  telnet timeout 5
  ssh 0.0.0.0 0.0.0.0 outside
  ssh timeout 30
  console timeout 0
  dhcpd auto_config outside
  !
  threat-detection basic-threat
  threat-detection statistics access-list
  no threat-detection statistics tcp-intercept
  webvpn
  username bel_md password HSiYQZRzgeT8u.ml encrypted privilege 15
  username nebia_said password qQ6OoFJ5IJa6sgLi encrypted privilege 15
  tunnel-group 194.2.XX.YY type ipsec-l2l
  tunnel-group 194.2.XX.YY ipsec-attributes
  pre-shared-key *****
  !
  class-map inspection_default
  match default-inspection-traffic
  !
  !
  policy-map type inspect dns preset_dns_map
  parameters
  message-length maximum client auto
  message-length maximum 512
  policy-map global_policy
  class inspection_default
  inspect dns preset_dns_map
  inspect ftp
  inspect h323 h225
  inspect h323 ras
  inspect rsh
  inspect rtsp
  inspect esmtp
  inspect sqlnet
  inspect skinny
  inspect sunrpc
  inspect xdmcp
  inspect sip
  inspect netbios
  inspect tftp
  inspect ip-options
  inspect icmp
  inspect ipsec-pass-thru
  !
  service-policy global_policy global
  prompt hostname context
  Cryptochecksum:0398876429c949a766f7de4fb3e2037e
  : end
  

  If you need any other information or explanation, just ask me.

  My firewall model: ASA 5505

  Thank you for the help.

  Hey Houari,.

  I suspect something with the order of your NATing statement which is:

  NAT (inside, outside) static static source NETWORK_OBJ_172.19.32.0_19 destination NETWORK_OBJ_192.168.67.0_24 NETWORK_OBJ_192.168.67.0_24 NETWORK_OBJ_172.19.32.0_19

  Can you please have this change applied to the ASA:

  No source (indoor, outdoor) nat static static NETWORK_OBJ_172.19.32.0_19 destination NETWORK_OBJ_192.168.67.0_24 NETWORK_OBJ_192.168.67.0_24 NETWORK_OBJ_172.19.32.0_19

  NAT (inside, outside) 1 static source NETWORK_OBJ_192.168.67.0_24 NETWORK_OBJ_192.168.67.0_24 static destination NETWORK_OBJ_172.19.32.0_19 NETWORK_OBJ_172.19.32.0_19

  Try and let me know how it goes.

  If she did not help, please put the output form a package tracer will shape your internal network to the remote VPN subnet with the release of «see the nat detail»

  HTH,

  Mo.

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