Solved: ASA 5505 version 9.1(4) NAT issue

Rizwan · ‎03-01-2014

Hi,

I am using ASA 5505 version 9.1(4) and using dynamic NAT command to NAT(PAT) inside subnet 192.168.3.0/24 with outside interface 192.168.100.2/24

But unable to ping from inside host to internet or router interface 192.168.100.1 . Please suggest the show running is mentioned below.

Following is the logical diagram

192.168.100.1/24 192.168.100.2/24 192.168.3.1

Internet(ISP) ------------------->------------------ Router------------------------->(e0/0) ASA 5505 (9.1) eth0/4 ----- ---------- Host (192.168.3.22)

ASA Version 9.1(4)

!

hostname ciscoasa

enable password 2KFQnbNIdI.2KYOU encrypted

xlate per-session permit tcp any4 any4

xlate per-session permit udp any4 any4

names

!

interface Ethernet0/0

switchport access vlan 2

!

interface Ethernet0/1

!

interface Ethernet0/2

!

interface Ethernet0/3

!

interface Ethernet0/4

!

interface Ethernet0/5

!

interface Ethernet0/6

!

interface Ethernet0/7

ciscoasa(config)# object network Generic_All_Network

ciscoasa(config-network-object)# sub

ciscoasa(config-network-object)# subnet 0.0.0.0 0.0.0.0

ciscoasa(config-network-object)# ex

ciscoasa(config)# nat (inside,outside) source dynamic Generic_All_Network inte$

ciscoasa(config)#

ciscoasa(config)# wr

Building configuration...

Cryptochecksum: fe5175c6 25dfd45a 117bd6e3 867486db

3211 bytes copied in 1.120 secs (3211 bytes/sec)

[OK]

ciscoasa(config)# sh run

: Saved

:

ASA Version 9.1(4)

!

hostname ciscoasa

enable password 2KFQnbNIdI.2KYOU encrypted

xlate per-session permit tcp any4 any4

xlate per-session permit udp any4 any4

names

!

interface Ethernet0/0

switchport access vlan 2

!

interface Ethernet0/1

!

interface Ethernet0/2

!

interface Ethernet0/3

!

interface Ethernet0/4

!

interface Ethernet0/5

!

interface Ethernet0/6

!

interface Ethernet0/7

!

interface Vlan1

nameif inside

security-level 100

ip address 192.168.3.1 255.255.255.0

!

interface Vlan2

nameif outside

security-level 0

ip address 192.168.100.2 255.255.255.0

!

ftp mode passive

object network inside_hosts

subnet 192.168.3.0 255.255.255.0

object network Generic_All_Network

subnet 0.0.0.0 0.0.0.0

access-list inbound extended permit ip any any

access-list inbound extended permit icmp any4 any4

access-list inside_access_in extended permit ip 192.168.3.0 255.255.255.0 any

pager lines 24

logging enable

logging asdm informational

mtu outside 1500

mtu inside 1500

ip verify reverse-path interface outside

ip verify reverse-path interface inside

icmp unreachable rate-limit 1 burst-size 1

no asdm history enable

arp timeout 14400

arp permit-nonconnected

nat (inside,outside) source dynamic Generic_All_Network interface

!

object network inside_hosts

nat (inside,outside) dynamic interface

access-group inbound in interface outside

access-group inside_access_in in interface inside

route outside 0.0.0.0 0.0.0.0 192.168.100.1 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 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

http server enable

http 192.168.3.0 255.255.255.0 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 warmstart

crypto ipsec security-association pmtu-aging infinite

crypto ca trustpool policy

telnet timeout 5

ssh timeout 5

ssh key-exchange group dh-group1-sha1

console timeout 0

dhcpd auto_config outside

!

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

call-home reporting anonymous prompt 2

Cryptochecksum:fe5175c625dfd45a117bd6e3867486db

: end

Marius Gunnerud · ‎03-01-2014

Is there a specific reason why you are NATing on the ASA? Is the router managed by your company?

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View solution in original post

Marius Gunnerud · ‎03-01-2014

Just for testing and eliminating add a permit ip any any to the outside interface.

access-list test extended permit ip any any

access-group test in interface outside

and then test again please.

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View solution in original post

Marius Gunnerud · ‎03-01-2014

Please remove the following command

nat (inside,outside) source dynamic Generic_All_Network interface

You already have a dynamic NAT for the inside hosts:

object network inside_hosts

subnet 192.168.3.0 255.255.255.0

nat (inside,outside) dynamic interface

does the router have a route back to the 192.168.3/24 network?

could you issue a packet tracer on the ASA and post the output here please.

packet-tracer input inside tcp 192.168.3.22 1234 4.2.2.2 80 detail

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Rizwan · ‎03-01-2014

Following is the output from packet tracer

ciscoasa# packet-tracer input inside tcp 192.168.3.22 1234 4.2.2.2 80 detail

Phase: 1

Type: ACCESS-LIST

Subtype:

Result: ALLOW

Config:

Implicit Rule

Additional Information:

Forward Flow based lookup yields rule:

in id=0xcb12af48, priority=1, domain=permit, deny=false

hits=0, 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=inside, output_ifc=any

Phase: 2

Type: ROUTE-LOOKUP

Subtype: input

Result: ALLOW

Config:

Additional Information:

in 0.0.0.0 0.0.0.0 outside

Phase: 3

Type: ROUTE-LOOKUP

Subtype: input

Result: ALLOW

Config:

Additional Information:

in 192.168.3.0 255.255.255.0 inside

Phase: 4

Type: ACCESS-LIST

Subtype: log

Result: ALLOW

Config:

access-group inside_access_in in interface inside

access-list inside_access_in extended permit ip 192.168.3.0 255.255.255.0 any

Additional Information:

Forward Flow based lookup yields rule:

in id=0xcb202db8, priority=13, domain=permit, deny=false

hits=0, user_data=0xc9234ab0, cs_id=0x0, use_real_addr, flags=0x0, protocol=0

src ip/id=192.168.3.0, mask=255.255.255.0, port=0, tag=0

dst ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=0, dscp=0x0

input_ifc=inside, output_ifc=any

Phase: 5

Type: NAT

Subtype:

Result: ALLOW

Config:

nat (inside,outside) source dynamic Generic_All_Network interface

Additional Information:

Dynamic translate 192.168.3.22/1234 to 192.168.100.2/1234

Forward Flow based lookup yields rule:

in id=0xcb1fcee0, priority=6, domain=nat, deny=false

hits=0, user_data=0xcb1fc080, cs_id=0x0, flags=0x0, protocol=0

src ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=0

dst ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=0, dscp=0x0

input_ifc=inside, output_ifc=outside

Phase: 6

Type: NAT

Subtype: per-session

Result: ALLOW

Config:

Additional Information:

Forward Flow based lookup yields rule:

in id=0xc7669ae8, priority=1, domain=nat-per-session, deny=false

hits=0, 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=0

dst ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=0, dscp=0x0

input_ifc=any, output_ifc=any

Phase: 7

Type: IP-OPTIONS

Subtype:

Result: ALLOW

Config:

Additional Information:

Forward Flow based lookup yields rule:

in id=0xcb1baae8, priority=0, domain=inspect-ip-options, deny=true

hits=0, 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=0

dst ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=0, dscp=0x0

input_ifc=inside, output_ifc=any

Phase: 8

Type: HOST-LIMIT

Subtype:

Result: ALLOW

Config:

Additional Information:

Forward Flow based lookup yields rule:

in id=0xcb1e86f8, priority=0, domain=host-limit, deny=false

hits=1, 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=0

dst ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=0, dscp=0x0

input_ifc=inside, output_ifc=any

Phase: 9

Type: NAT

Subtype: rpf-check

Result: ALLOW

Config:

nat (inside,outside) source dynamic Generic_All_Network interface

Additional Information:

Forward Flow based lookup yields rule:

out id=0xcb1fd6f0, priority=6, domain=nat-reverse, deny=false

hits=1, user_data=0xcb1fc138, 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=0

dst ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=0, dscp=0x0

input_ifc=inside, output_ifc=outside

Phase: 10

Type: NAT

Subtype: per-session

Result: ALLOW

Config:

Additional Information:

Reverse Flow based lookup yields rule:

in id=0xc7669ae8, priority=1, domain=nat-per-session, deny=false

hits=2, 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=0

dst ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=0, dscp=0x0

input_ifc=any, output_ifc=any

Phase: 11

Type: IP-OPTIONS

Subtype:

Result: ALLOW

Config:

Additional Information:

Reverse Flow based lookup yields rule:

in id=0xcb1e3f10, priority=0, domain=inspect-ip-options, deny=true

hits=1, 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=0

dst ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=0, dscp=0x0

input_ifc=outside, output_ifc=any

Phase: 12

Type: FLOW-CREATION

Subtype:

Result: ALLOW

Config:

Additional Information:

New flow created with id 1, packet dispatched to next module

Module information for forward flow ...

snp_fp_tracer_drop

snp_fp_inspect_ip_options

snp_fp_tcp_normalizer

snp_fp_translate

snp_fp_adjacency

snp_fp_fragment

snp_ifc_stat

Module information for reverse flow ...

snp_fp_tracer_drop

snp_fp_inspect_ip_options

snp_fp_translate

snp_fp_tcp_normalizer

snp_fp_adjacency

snp_fp_fragment

snp_ifc_stat

Result:

input-interface: inside

input-status: up

input-line-status: up

output-interface: outside

output-status: up

output-line-status: up

Action: allow

Marius Gunnerud · ‎03-01-2014

Well, the packet is allowed through the ASA, which leads me to believe this is a routing issue on the router...or more acurately, this is a NAT issue on the ASA. Really depends on how you want to look at it.

Why are you NATing on the ASA when you have a router between the ASA and the internet?

I suspect that the router has an incorrect route with regards the inside network being NATed. If the router is managed by you, then I suggest removing all NAT configuration on the ASA and perform NAT on the router.

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Rizwan · ‎03-01-2014

If packet is allowed through ASA then how is it NAT issue?

Rizwan · ‎03-01-2014

Please see below trace for icmp its dropped.

ciscoasa(config)# packet-tracer input inside icmp 192.168.3.22 12 34 4.2.2.2 d$

Phase: 1

Type: ROUTE-LOOKUP

Subtype: input

Result: ALLOW

Config:

Additional Information:

in 0.0.0.0 0.0.0.0 outside

Phase: 2

Type: ROUTE-LOOKUP

Subtype: input

Result: ALLOW

Config:

Additional Information:

in 192.168.3.0 255.255.255.0 inside

Phase: 3

Type: ACCESS-LIST

Subtype: log

Result: ALLOW

Config:

access-group inside_access_in in interface inside

access-list inside_access_in extended permit ip 192.168.3.0 255.255.255.0 any

Additional Information:

Forward Flow based lookup yields rule:

in id=0xcb202db8, priority=13, domain=permit, deny=false

hits=2, user_data=0xc9234ab0, cs_id=0x0, use_real_addr, flags=0x0, protocol=0

src ip/id=192.168.3.0, mask=255.255.255.0, port=0, tag=0

dst ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=0, dscp=0x0

input_ifc=inside, output_ifc=any

Phase: 4

Type: NAT

Subtype:

Result: ALLOW

Config:

object network inside_hosts

nat (inside,outside) dynamic interface

Additional Information:

Forward Flow based lookup yields rule:

in id=0xcb200698, priority=6, domain=nat, deny=false

hits=1, user_data=0xcb1fc1f0, cs_id=0x0, flags=0x0, protocol=0

src ip/id=192.168.3.0, mask=255.255.255.0, port=0, tag=0

dst ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=0, dscp=0x0

input_ifc=inside, output_ifc=outside

Phase: 5

Type: NAT

Subtype: per-session

Result: ALLOW

Config:

Additional Information:

Forward Flow based lookup yields rule:

in id=0xcab4fd00, priority=0, domain=nat-per-session, deny=true

hits=0, user_data=0x0, cs_id=0x0, reverse, use_real_addr, flags=0x0, protocol=0

src ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=0

dst ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=0, 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=0xcb1baae8, priority=0, domain=inspect-ip-options, deny=true

hits=3, 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=0

dst ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=0, dscp=0x0

input_ifc=inside, output_ifc=any

Phase: 7

Type: INSPECT

Subtype: np-inspect

Result: ALLOW

Config:

class-map inspection_default

match default-inspection-traffic

policy-map global_policy

class inspection_default

inspect icmp

service-policy global_policy global

Additional Information:

Forward Flow based lookup yields rule:

in id=0xcb7774d0, priority=70, domain=inspect-icmp, deny=false

hits=1, user_data=0xcb7769f8, cs_id=0x0, use_real_addr, flags=0x0, protocol=1

src ip/id=0.0.0.0, mask=0.0.0.0, icmp-type=0, tag=0

dst ip/id=0.0.0.0, mask=0.0.0.0, icmp-code=0, tag=0, dscp=0x0

input_ifc=inside, output_ifc=any

Phase: 8

Type: INSPECT

Subtype: np-inspect

Result: ALLOW

Config:

Additional Information:

Forward Flow based lookup yields rule:

in id=0xcb1ba5e8, priority=66, domain=inspect-icmp-error, deny=false

hits=1, user_data=0xcb1b9bf8, cs_id=0x0, use_real_addr, flags=0x0, protocol=1

src ip/id=0.0.0.0, mask=0.0.0.0, icmp-type=0, tag=0

dst ip/id=0.0.0.0, mask=0.0.0.0, icmp-code=0, tag=0, dscp=0x0

input_ifc=inside, output_ifc=any

Phase: 9

Type: HOST-LIMIT

Subtype:

Result: ALLOW

Config:

Additional Information:

Forward Flow based lookup yields rule:

in id=0xcb1e86f8, priority=0, domain=host-limit, deny=false

hits=3, 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=0

dst ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=0, dscp=0x0

input_ifc=inside, output_ifc=any

Result:

input-interface: inside

input-status: up

input-line-status: up

output-interface: outside

output-status: up

output-line-status: up

Action: drop

Drop-reason: (acl-drop) Flow is denied by configured rule

Rizwan · ‎03-01-2014

Does 192.168.3.0/24 requires any route in the Router because it will be NAT with outside interface. first

ASA required to create an IPSEC tunnel, but first need to resolve NAT issue.

Message was edited by: Rizwan Siddiqi

Rizwan · ‎03-01-2014

problem is in this phase

Phase: 5

Type: NAT

Subtype: per-session

Result: ALLOW

Config:

Additional Information:

Forward Flow based lookup yields rule:

in id=0xcab4fd00, priority=0, domain=nat-per-session, deny=true

hits=0, user_data=0x0, cs_id=0x0, reverse, use_real_addr, flags=0x0, protocol=0

src ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=0

dst ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=0, 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=0xcb1baae8, priority=0, domain=inspect-ip-options, deny=true

hits=3, 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=0

dst ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=0, dscp=0x0

input_ifc=inside, output_ifc=any

Marius Gunnerud · ‎03-01-2014

could you post the output of the command please:

show service-policy inspect ip-options

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Marius Gunnerud · ‎03-01-2014

Is there a specific reason why you are NATing on the ASA? Is the router managed by your company?

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Marius Gunnerud · ‎03-01-2014

Also check your logs when you ping the router. This could give some helpful pointers as to what is dropping the packet.

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Rizwan · ‎03-01-2014

Fiber is terminating at router.

Rizwan · ‎03-01-2014

ciscoasa(config)# show service-policy inspect ip-options

Global policy:

Service-policy: global_policy

Class-map: inspection_default

Inspect: ip-options _default_ip_options_map, packet 0, drop 0, reset-drop 0, v6-fail-close 0

Router Alert: allow 0, clear 0

Rizwan · ‎03-01-2014

I ping from inside interface and get following output

ciscoasa(config)# ping

TCP Ping [n]:

Target IP address: 192.168.100.1

Repeat count: [5]

Datagram size: [100]

Timeout in seconds: [2]

Extended commands [n]:

Sweep range of sizes [n]:

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 192.168.100.1, timeout is 2 seconds:

%ASA-6-110003: Routing failed to locate next hop for icmp from NP Identity Ifc:192.168.3.1/0 to inside:192.168.100.1/0

?????

Success rate is 0 percent (0/5)

ciscoasa(config)# %ASA-5-111008: User 'enable_15' executed the 'ping' command.

%ASA-5-111010: User 'enable_15', running 'CLI' from IP 0.0.0.0, executed 'ping'

ciscoasa(config)#

Rizwan · ‎03-01-2014

Do you have any idea about nat-per-session for icmp because for it deny = true see below output

Phase: 5

Type: NAT

Subtype: per-session

Result: ALLOW

Config:

Additional Information:

Forward Flow based lookup yields rule:

in id=0xcab4fd00, priority=0, domain=nat-per-session, deny=true

hits=0, user_data=0x0, cs_id=0x0, reverse, use_real_addr, flags=0x0, protocol=0

src ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=0

dst ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=0, 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=0xcb1baae8, priority=0, domain=inspect-ip-options, deny=true

hits=3, 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=0

dst ip/id=0.0.0.0, mask=0.0.0.0, port=0, tag=0, dscp=0x0

input_ifc=inside, output_ifc=any