topic Hi Siren, in Network Security

Nat Rule not working

crawley2017 — Tue, 12 Mar 2019 09:39:52 GMT

Nat Rule not working | Firewalling | Cisco Support Community

Hi,

I am newbie and learning to manage the ASA 5505.

I have got a site where we have one broadband with one Static IP.

I wanted to configure to monitor CCTV but it doesnt seem to work.

I have used Packet tracer and I get the error on access list Config Implicit Rule.

Can please someone direct me where I am going wrong here?

object network CAMERA
nat (any,outside) dynamic interface

access-list acl-outside extended permit tcp any object CAMERA eq 8000

Thanks,

Hi,

siren eam — Thu, 06 Jul 2017 15:30:18 GMT

Hi,

Please check this link if it can help:

http://www.networkworld.com/article/2162844/tech-primers/how-to-configure-static-nat-on-a-cisco-asa-security-appliance.html

Hi crawley2017,

Spooster IT Services — Thu, 06 Jul 2017 17:02:26 GMT

Hi crawley2017,

Try the following configuration and test.

object-group network ANY
network-object 0.0.0.0 0.0.0.0

object service 8000
service tcp destination eq 8000

nat (outside,any) source static ANY ANY destination static interface CAMERA service 8000 8000

Hi Siren,

crawley2017 — Fri, 07 Jul 2017 07:54:59 GMT

Hi Siren,

I followed Dan's example and created

object network Camera
Host 10.10.10.1
nat (inside, outside) static interface service tcp 8000 8000
access-list Camera-monitor extended permit tcp any host 10.10.10.1 eq 8000
access-group Camera-monitor in interface outside

It failed when I used Packet Tracer

Hi,

crawley2017 — Mon, 10 Jul 2017 11:24:27 GMT

Hi,

I followed your example

object-group network ANY
network-object 0.0.0.0 0.0.0.0 ( I used camera ip address)

object service 8000
service tcp destination eq 8000

nat (outside,any) source static ANY ANY destination static interface CAMERA service 8000 8000

I could not make it work.

Hi Crawley,

Spooster IT Services — Mon, 10 Jul 2017 11:28:05 GMT

Hi Crawley,

Can you please send the whole configuration of the ASA?

Hi,

Aditya Ganjoo — Mon, 10 Jul 2017 11:55:53 GMT

Hi,

The config looks fine.

Can you try with actual traffic?

Can you post the result from CLI:

packet-tracer input outside tcp 4.2.2.2 8787 <interface outside ip> 8080 det ?

Regards,

Aditya

!hostname ASAenable password

crawley2017 — Mon, 10 Jul 2017 12:05:53 GMT

!
hostname ASA
enable password encrypted
names
!
interface Ethernet0/0
switchport access vlan 2
!
interface Ethernet0/1
!
interface Ethernet0/2
!
interface Ethernet0/3
!
interface Ethernet0/4
!
interface Ethernet0/5
switchport access vlan 4
!
interface Ethernet0/6
!
interface Ethernet0/7
!
interface Vlan1
no forward interface Vlan4
nameif inside
security-level 100
ip address 192.168.1.254 255.255.255.0
!
interface Vlan2
nameif outside
security-level 0
pppoe client vpdn group Dialler
ip address pppoe setroute
!
interface Vlan4
nameif DMZ
security-level 0
ip address 192.168.231.254 255.255.255.0
!
ftp mode passive
dns domain-lookup inside
dns server-group DefaultDNS
name-server 192.168.1.2
name-server 192.168.1.10
object network obj_any
subnet 0.0.0.0 0.0.0.0
object network CAMERA
host 192.168.1.246
object service 8000
service tcp destination eq 8000
object-group service CAMERA-PORTS tcp
port-object eq 8000
access-list CCTV-Monitoring extended permit tcp any object CAMERA object-group CAMERA-PORTS
pager lines 24
logging asdm informational
mtu inside 1500
mtu outside 1500
mtu DMZ 1500
icmp unreachable rate-limit 1 burst-size 1
icmp permit any outside
no asdm history enable
arp timeout 14400
no arp permit-nonconnected
!
object network obj_any
nat (inside,outside) dynamic interface
access-group CCTV-Monitoring in interface outside
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 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
dynamic-access-policy-record DfltAccessPolicy
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
crypto ipsec security-association pmtu-aging infinite
crypto ca trustpool policy
telnet timeout 5
no ssh stricthostkeycheck
ssh 192.168.1.0 255.255.255.0 inside
ssh timeout 5
ssh key-exchange group dh-group1-sha1
console timeout 0

dhcpd auto_config outside
!
dhcpd address 192.168.231.10-192.168.231.200 DMZ
dhcpd dns 8.8.8.8 208.67.222.222 interface DMZ
dhcpd enable DMZ
!
threat-detection basic-threat
threat-detection statistics access-list
no threat-detection statistics tcp-intercept
!
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:d6498956d9481d43fc8cb50bc67dd85e
: end

Hey Aditya,

crawley2017 — Mon, 10 Jul 2017 12:31:44 GMT

Hey Aditya,

Please see below.

Phase: 1
Type: ROUTE-LOOKUP
Subtype: Resolve Egress Interface
Result: ALLOW
Config:
Additional Information:
in x.x.x.x 255.255.255.255 identity

Phase: 2
Type: NAT
Subtype: per-session
Result: ALLOW
Config:
Additional Information:

Phase: 3
Type: ACCESS-LIST
Subtype:
Result: DROP
Config:
Implicit Rule
Additional Information:

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

the access list is

access-list CCTV extended permit tcp any object CAMERA object-group CAMERA-PORTS

Access-group CCTV in interface outside

Hi Crawley,

Spooster IT Services — Mon, 10 Jul 2017 12:51:44 GMT

Hi Crawley,

Please add the following NAT rule same as it is and test it.

nat (outside,inside) source static obj_any obj_any destination static interface CAMERA service 8000 8000

still the same.

crawley2017 — Mon, 10 Jul 2017 13:04:01 GMT

still the same.

Let me explain my setup. I

crawley2017 — Tue, 11 Jul 2017 14:38:01 GMT

Let me explain my setup. I have got two asa and the old asa 1 is working ok and I have got static IP addresses for each service. I have added a second switch and ASA2 for resiliency. All the internal traffic goes to ASA1 and NAT is fine as the switch the gateway for all VLAN and forward the external traffic to ASA1.

I presented another switch and ASA2 and wanted to use similar rules as ASA1 but somehow it is not working. Nat works fine when I use it for same subnet but it doesnt when I use different VLAN for CCTV etc. The CCTV is using VLAN 20 and I can ping VLAN 200 from ASA2.

I have attached a pic to understand if it helps.

Hi crawley2017,

Spooster IT Services — Tue, 11 Jul 2017 14:38:02 GMT

Hi crawley2017,

Can you answer the following

Que 1) What are subnets you are using for CCTV (both old and new subnet)?

Que 2) What are the Camera IP (both old and new) ?

I have not changed the CCTV

crawley2017 — Tue, 11 Jul 2017 15:07:32 GMT

I have not changed the CCTV subnet. The old and new are on VLAN200. I have not changed any IP Address.

There is a route for Vlan 200 on ASA2.

Hi crawley2017,

Spooster IT Services — Tue, 11 Jul 2017 15:17:47 GMT

Hi crawley2017,

I suspect there is something wrong configured or missed.

Ques1 ) Is everything working for ASA1?

Ques 2) What are the interface nameif's on both ASA's?

Can you attached the running config of both ASA's? (Remember to remove sensitive information)

I think it is more of a

crawley2017 — Thu, 13 Jul 2017 08:40:31 GMT

I think it is more of a routing issue here but trying to understand where I need to start as One is working but the second one isn't. The VLANs are same and nameif interfaces are same as well. Both ASAs are on the same subnet.

I just tested a NAT on the same subnet and it worked. So I am sure it maybe something to do with the routing or I am wrong :).

One more thing I noticed in ASDM I could see the Hits going up.

I checked the logs and found something SYNTIMEOUT.

Teardown TCP connection 29234 for outside:8.8.8.8/80 to inside:192.168.20.50/8000 duration 0:00:30 bytes 0 SYN Timeout.

is it something to do with

crawley2017 — Thu, 13 Jul 2017 09:23:46 GMT

is it something to do with same subnet. as CCTV is on another subnet.

When I use sh arp command I do not see CCTV subnet and my layer 3 switch does the routing for Vlans.