topic HiMy ASA doesnt allow nat in Network Security

ASA:Unable to ping from Inside LAN to Outside LAN

raza555 — Tue, 12 Mar 2019 05:02:14 GMT

I am configuring basic ASA, but unable to ping from inside LAN->dmz LAN, inside LAN ->outside LAN, dmz LAN->outside LAN.

Attached is my basic topology and below are ASA configurations.

ciscoasa(config)# sh run
: Saved
:
ASA Version 8.4(2)
!
hostname ciscoasa
enable password 8Ry2YjIyt7RRXU24 encrypted
passwd 2KFQnbNIdI.2KYOU encrypted
names
!
interface GigabitEthernet0
nameif outside
security-level 0
ip address 136.1.215.1 255.255.255.0
!
interface GigabitEthernet1
nameif inside
security-level 100
ip address 192.168.1.1 255.255.255.0
!
interface GigabitEthernet2
nameif dmz
security-level 50
ip address 10.10.10.1 255.255.255.0
!
interface GigabitEthernet3
shutdown
no nameif
no security-level
no ip address
!
interface GigabitEthernet4
shutdown
no nameif
no security-level
no ip address
!
interface GigabitEthernet5
shutdown
no nameif
no security-level
no ip address
!
ftp mode passive
pager lines 24
mtu outside 1500
mtu inside 1500
mtu dmz 1500
icmp unreachable rate-limit 1 burst-size 1
no asdm history enable
arp timeout 14400
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
timeout floating-conn 0:00:00
dynamic-access-policy-record DfltAccessPolicy
user-identity default-domain LOCAL
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart warmstart
telnet timeout 5
ssh timeout 5
console timeout 0
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 migrated_dns_map_1
parameters
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 rsh
inspect rtsp
inspect esmtp
inspect sqlnet
inspect skinny
inspect sunrpc
inspect xdmcp
inspect sip
inspect netbios
inspect tftp
inspect icmp
!
service-policy global_policy global
prompt hostname context
call-home reporting anonymous prompt 1
call-home
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
crashinfo save disable
Cryptochecksum:29a8ded81399e01dacb949455ceabb7f
: end
ciscoasa(config)#

Hi, With regards to the

Jouni Forss — Thu, 06 Nov 2014 08:24:52 GMT

Hi,

With regards to the problem with ICMP from the DMZ/LAN to the external network the problem is most likely the missing NAT configurations. You should have a Dynamic PAT configurations for those internal subnets so they are visible with the public IP address to the external router. Then the ICMP should work

You could for example use

nat (any,outside) after-auto source dynamic any interface

I am not sure about the problem with the LAN -> DMZ ICMP problem. If this is a simulated lab situation I would make sure that the R1 has a default route towards the DMZ interface IP address of the ASA.

There does not seem to be anything in the ASA configurations that should prevent ICMP from LAN to DMZ.

- Jouni

HiMy ASA doesnt allow nat

Ravi — Mon, 10 Nov 2014 10:07:23 GMT

My ASA doesnt allow nat (inside,outside)

It only allows nat(inside)

What could cause this?

Would you please be able to assist on this question:

https://supportforums.cisco.com/discussion/12316661/asa-5505-lan-no-internet-tcp-teardown-deny-connection-logs#comment-10062986

Thank you

Hi,It is because u are using

Vibhor Amrodia — Thu, 13 Nov 2014 05:58:24 GMT

Hi,

It is because u are using ASA 8.2.5

You would have to use Nat and global statements.

nat (inside) 1 0 0

global (outside) 1 interface

Thanks and Regards,

Vibhor Amrodia

HiThank you for responding I

Ravi — Thu, 13 Nov 2014 12:55:31 GMT

Thank you for responding

I did double check. The Nat and global statements are defined

Look forward to your assistance. And thank you