ASA rpf-check DROP

[fachman_1]

Hi,

I've got ASA 5506-X. The task is to provide access to Web server which is located in dmz from internet (outside). I use static NAT 192.168.120.254 (Web server)--> 95.67.82.153 (Public IP). Unfortunately, it is not working. I try different configurations with NAT and ACL. 

Error- 

Type: NAT
Subtype: rpf-check
Result: DROP

Config and packet trace output are here. Give me a hint how to handle static NAT issue, please!

ciscoasa(config)# packet-tracer input outside tcp 95.67.82.129 www 192.168.120$

Phase: 1
Type: ACCESS-LIST
Subtype:
Result: ALLOW
Config:
Implicit Rule
Additional Information:
Forward Flow based lookup yields rule:
in id=0x7f79a4cf3340, priority=1, domain=permit, deny=false
hits=42293680, user_data=0x0, cs_id=0x0, l3_type=0x8
src mac=0000.0000.0000, mask=0000.0000.0000
dst mac=0000.0000.0000, mask=0100.0000.0000
input_ifc=outside, output_ifc=any

Phase: 2
Type: ROUTE-LOOKUP
Subtype: Resolve Egress Interface
Result: ALLOW
Config:
Additional Information:
found next-hop 192.168.120.254 using egress ifc dmz

Phase: 3
Type: ROUTE-LOOKUP
Subtype: Resolve Egress Interface
Result: ALLOW
Config:
Additional Information:
found next-hop 95.67.82.129 using egress ifc outside

Phase: 4
Type: ACCESS-LIST
Subtype: log
Result: ALLOW
Config:
access-group outside-dmz in interface outside
access-list outside-dmz extended permit ip any host 192.168.120.254
Additional Information:
Forward Flow based lookup yields rule:
in id=0x7f79a62d7090, priority=13, domain=permit, deny=false
hits=6, user_data=0x7f799ef187c0, cs_id=0x0, use_real_addr, flags=0x0, protocol=0
src ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=any
dst ip/id=192.168.120.254, mask=255.255.255.255, port=0, tag=any, dscp=0x0
input_ifc=outside, output_ifc=any

Phase: 5
Type: NAT
Subtype: per-session
Result: ALLOW
Config:
Additional Information:
Forward Flow based lookup yields rule:
in id=0x7f79a42a38f0, priority=0, domain=nat-per-session, deny=false
hits=5402302, user_data=0x0, cs_id=0x0, reverse, use_real_addr, flags=0x0, protocol=6
src ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=any
dst ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=any, dscp=0x0
input_ifc=any, output_ifc=any

Phase: 6
Type: IP-OPTIONS
Subtype:
Result: ALLOW
Config:
Additional Information:
Forward Flow based lookup yields rule:
in id=0x7f79a4cfb800, priority=0, domain=inspect-ip-options, deny=true
hits=2832591, user_data=0x0, cs_id=0x0, reverse, flags=0x0, protocol=0
src ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=any
dst ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=any, dscp=0x0
input_ifc=outside, output_ifc=any

Phase: 7
Type: VPN
Subtype: ipsec-tunnel-flow
Result: ALLOW
Config:
Additional Information:
Forward Flow based lookup yields rule:
in id=0x7f79a5c6a000, priority=13, domain=ipsec-tunnel-flow, deny=true
hits=2905, user_data=0x0, cs_id=0x0, flags=0x0, protocol=0
src ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=any
dst ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=any, dscp=0x0
input_ifc=outside, output_ifc=any

Phase: 8
Type: ACCESS-LIST
Subtype: log
Result: ALLOW
Config:
access-group provider out interface dmz
access-list provider extended permit ip any any
Additional Information:
Forward Flow based lookup yields rule:
out id=0x7f79a77ae600, priority=13, domain=permit, deny=false
hits=8, user_data=0x7f799ef18580, cs_id=0x0, use_real_addr, flags=0x0, protocol=0
src ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=any
dst ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=any, dscp=0x0
input_ifc=any, output_ifc=dmz

Phase: 9
Type: NAT
Subtype: rpf-check
Result: DROP
Config:
object network server
nat (dmz,outside) static 95.67.82.153 net-to-net dns no-proxy-arp
Additional Information:
Forward Flow based lookup yields rule:
out id=0x7f79a5d65070, priority=6, domain=nat-reverse, deny=false
hits=4, user_data=0x7f79a5e44620, cs_id=0x0, use_real_addr, flags=0x0, protocol=0
src ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=any
dst ip/id=192.168.120.254, mask=255.255.255.255, port=0, tag=any, dscp=0x0
input_ifc=outside, output_ifc=dmz

Result:
input-interface: outside
input-status: up
input-line-status: up
output-interface: dmz
output-status: up
output-line-status: up
Action: drop
Drop-reason: (acl-drop) Flow is denied by configured rule

ASA Version 9.6(1)
!
hostname ciscoasa
enable password 8Ry2YjIyt7RRXU24 encrypted
names

!
interface GigabitEthernet1/1
description Do not forget to reassign zone to 0
nameif outside
security-level 0
ip address dhcp setroute
!
interface GigabitEthernet1/2
nameif inside
security-level 100
ip address 192.168.1.1 255.255.255.0
!
interface GigabitEthernet1/3
description Use for server
nameif dmz
security-level 50
ip address 192.168.120.1 255.255.255.0
!
interface GigabitEthernet1/4
description Wifi redundant
nameif WiFi
security-level 45
ip address 172.16.50.1 255.255.255.0
!
interface GigabitEthernet1/5
shutdown
no nameif
no security-level
no ip address
!
interface GigabitEthernet1/5.66
vlan 66
no nameif
no security-level
no ip address
!
interface GigabitEthernet1/6
shutdown
no nameif
no security-level
no ip address
!
interface GigabitEthernet1/7
shutdown
no nameif
no security-level
no ip address
!
interface GigabitEthernet1/8
shutdown
no nameif
no security-level
no ip address
!
interface Management1/1
management-only
no nameif
no security-level
no ip address
!
ftp mode passive
clock timezone EEST 2
clock summer-time EEDT recurring last Sun Mar 3:00 last Sun Oct 4:00
object network obj_any
subnet 0.0.0.0 0.0.0.0
object network Office
subnet 192.168.1.0 255.255.255.0
object network server
host 192.168.120.254
description access to server from 95.67.92.235
object network serve
access-list outside-dmz extended permit ip any host 192.168.120.254
access-list inbound55 extended permit ip any any
access-list dmz extended permit ip any any
access-list provider extended permit ip any any
pager lines 24
logging enable
logging asdm informational
mtu outside 1500
mtu inside 1500
mtu dmz 1500
mtu WiFi 1500
ip verify reverse-path interface outside
icmp unreachable rate-limit 1 burst-size 1
no asdm history enable
arp timeout 14400
no arp permit-nonconnected
!
object network obj_any
nat (inside,outside) dynamic interface
object network server
nat (dmz,outside) static 95.67.82.153 net-to-net dns no-proxy-arp
access-group outside-dmz in interface outside
access-group dmz in interface dmz
access-group provider out interface dmz
route inside 10.10.20.0 255.255.255.0 192.168.1.5 1
route outside 95.67.82.128 255.255.255.128 95.67.82.129 1
route inside 192.168.88.0 255.255.255.0 192.168.1.5 1
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
aaa authentication ssh console LOCAL
http server enable
http 192.168.1.0 255.255.255.0 inside
no snmp-server location
no snmp-server contact
service sw-reset-button

crypto ipsec ikev1 transform-set ESP-DES-SHA-TRANS mode transport
crypto ipsec ikev1 transform-set ESP-DES-MD5-TRANS esp-des esp-md5-hmac
crypto ipsec ikev1 transform-set ESP-DES-MD5-TRANS mode transport
crypto ipsec ikev2 ipsec-proposal AES256
protocol esp encryption aes-256
protocol esp integrity sha-1 md5
crypto ipsec ikev2 ipsec-proposal AES192
protocol esp encryption aes-192
protocol esp integrity sha-1 md5
crypto ipsec ikev2 ipsec-proposal AES
protocol esp encryption aes
protocol esp integrity sha-1 md5
crypto ipsec ikev2 ipsec-proposal 3DES
protocol esp encryption 3des
protocol esp integrity sha-1 md5
crypto ipsec ikev2 ipsec-proposal DES
protocol esp encryption des
protocol esp integrity sha-1 md5
crypto ipsec security-association pmtu-aging infinite
crypto ca trustpoint ASDM_Launcher_Access_TrustPoint_0
enrollment self
fqdn none
subject-name CN=192.168.1.1,CN=ciscoasa
keypair ASDM_LAUNCHER
crl configure
crypto ca trustpool policy
crypto ca certificate chain ASDM_Launcher_Access_TrustPoint_0

quit
crypto ikev2 policy 1
encryption aes-256
integrity sha
group 5 2
prf sha
lifetime seconds 86400
crypto ikev2 policy 10
encryption aes-192
integrity sha
group 5 2
prf sha
lifetime seconds 86400
crypto ikev2 policy 20
encryption aes
integrity sha
group 5 2
prf sha
lifetime seconds 86400
crypto ikev2 policy 30
encryption 3des
integrity sha
group 5 2
prf sha
lifetime seconds 86400
crypto ikev2 policy 40
encryption des
integrity sha
group 5 2
prf sha
lifetime seconds 86400
crypto ikev2 enable outside
crypto ikev1 enable outside
crypto ikev1 policy 20
authentication rsa-sig
encryption aes-256
hash sha
group 2
lifetime 86400
crypto ikev1 policy 30
authentication pre-share
encryption aes-256
hash sha
group 2
lifetime 86400
crypto ikev1 policy 50
authentication rsa-sig
encryption aes-192
hash sha
group 2
lifetime 86400
crypto ikev1 policy 60
authentication pre-share
encryption aes-192
hash sha
group 2
lifetime 86400
crypto ikev1 policy 80
authentication rsa-sig
encryption aes
hash sha
group 2
lifetime 86400
crypto ikev1 policy 90
authentication pre-share
encryption aes
hash sha
group 2
lifetime 86400
crypto ikev1 policy 110
authentication rsa-sig
encryption 3des
hash sha
group 2
lifetime 86400
crypto ikev1 policy 120
authentication pre-share
encryption 3des
hash sha
group 2
lifetime 86400
crypto ikev1 policy 140
authentication rsa-sig
encryption des
hash sha
group 2
lifetime 86400
crypto ikev1 policy 150
authentication pre-share
encryption des
hash sha
group 2
lifetime 86400
telnet timeout 5
ssh stricthostkeycheck
ssh 192.168.1.0 255.255.255.0 inside
ssh timeout 50
ssh version 2
ssh key-exchange group dh-group1-sha1
console timeout 0

dhcp-client broadcast-flag
dhcpd auto_config outside
!
dhcpd address 192.168.1.5-192.168.1.254 inside
dhcpd enable inside
!
dhcpd address 192.168.120.254-192.168.120.254 dmz
dhcpd enable dmz
!
ssl cipher default low
ssl cipher tlsv1 low
ssl cipher tlsv1.1 low
ssl cipher tlsv1.2 low
ssl cipher dtlsv1 low
ssl trust-point ASDM_Launcher_Access_TrustPoint_0 inside
ssl trust-point ASDM_Launcher_Access_TrustPoint_0 inside vpnlb-ip
webvpn
enable outside
cache
disable
error-recovery disable
group-policy remote internal
group-policy remote attributes
vpn-tunnel-protocol ssl-clientless
webvpn
url-list none
dynamic-access-policy-record DfltAccessPolicy
username guru password mq7FrqS57onsNCCN encrypted
username fort password VyhrrAMcqZYUjXbq encrypted privilege 0
username fort attributes
vpn-group-policy remote
tunnel-group Office type remote-access
tunnel-group Office general-attributes
default-group-policy remote
!
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
!
service-policy global_policy global
prompt hostname context
no call-home reporting anonymous
Cryptochecksum:781fa1a41c4f9dfd487e2b0164ab8d3c
: end

[Ajay Saini]

Hello,

First things first, you need to correct the packet-tracer output. The destination ip has to be the public ip of server. 

It should look like something below:

packet-tracer input outside tcp 4.2.2.2 3344 95.67.82.153 80

I have used 4.2.2.2 as a random public ip and a random source port of tcp 80

Please share results.

Also, please ensure that the dynamic PAT which includes the source ip of internal server should be below the static NAT.

Regards,

Ajay