topic Re: access to my webserver inside from outside ASA 9.x in Network Security

access to my webserver inside from outside ASA 9.x

alvarocomunicaciones — Fri, 21 Feb 2020 17:15:21 GMT

Hi!,I configured the access to my web server inside from the outside, but in spite of doing NAT the ACL seems no to be apply on outisde, when I put the IP public on browser from internet , I see how browser change public IP to private webserver IP but it doesn´t show the webpage because it says that the server does not respond, do any knows what could be happend? , if I inactive th ACL the result its the same that´s why i think it is not being apply on outside i have the following :

Object network server-Web

host 192.168.0.5

nat (inside,outside) static interface service tcp www www

access-list outside_access_in extended permit ip any any

access-list outside_access_in extended permit tcp any object server-Web eq www

access-group outside_access_in in interface outside

Re: access to my webserver inside from outside ASA 9.x

balaji.bandi — Sat, 29 Jun 2019 13:23:54 GMT

Try below nat rule if this is Static 1 to 1 IP NAT

nat (inside,outside) static x.x.x.x service tcp http http   <-- x.x.x.x is public IP

Re: access to my webserver inside from outside ASA 9.x

alvarocomunicaciones — Mon, 01 Jul 2019 16:21:59 GMT

Thanks for the response.

I did what you recommend but ASA show the following error :

Error: Address (IP Public) overlaps with outside interface address

Error: Nat policy is not downloaded

Re: access to my webserver inside from outside ASA 9.x

balaji.bandi — Mon, 01 Jul 2019 16:55:33 GMT

I have asked question before, do you use same outside interface IP for this service to NAT or you have Dedicated IP address.

if you have only 1 IP address outside follow below guide :

https://www.packet6.com/configuring-nat-for-a-public-server-using-same-outside-interface/

Re: access to my webserver inside from outside ASA 9.x

alvarocomunicaciones — Mon, 01 Jul 2019 21:42:30 GMT

I already test as the link indicates but it still not working, the weird her is that with or without access-list the result is the same : "server is not responding" , as if the acl were not having affect...

Re: access to my webserver inside from outside ASA 9.x

balaji.bandi — Tue, 02 Jul 2019 05:40:51 GMT

Can you share the logs of ASA while you accessing the web server from outside to inside.

also please confirm is the web server running and tested internally ?

post the output of telnet x.x.x.x 80 ( x is the internal IP from internal lan config web server running) ?

Re: access to my webserver inside from outside ASA 9.x

alvarocomunicaciones — Wed, 03 Jul 2019 20:03:02 GMT

when a I "logging enable" and "sh log " it doesn´t show me any related with tcp http traffic to internal webserver , but I did capture and show me the following:

Capture out interface outside match tcp any any eq 80

sh capture out

35: 03:39:17.678477 X.X.X.X.80 > IP_public_internet_service.37086: . ack 3490185580 win 256 <nop,nop,timestamp 159088307 440233631,nop,nop,sack sack 1 {3490185579:3490185580} >

36: 03:39:25.521930 IP_public_internet_service.37106 > X.X.X.X.80: S 768367601:768367601(0) win 17520 <mss 1412,nop,wscale 8,sackOK,timestamp 440286435 0>

37: 03:39:25.522510 X.X.X.X.80 > IP_public_internet_service.37106: S 2359779937:2359779937(0) ack 768367602 win 8192 <mss 1380,nop,wscale 8,sackOK,timestamp 159089091 440286435>

38: 03:39:25.529544 IP_public_internet_service.37086 > X.X.X.X.80: P 3490185580:3490185997(417) ack 2442974898 win 65 <nop,nop,timestamp 440286443 159088307>

39: 03:39:25.555086 X.X.X.X.80 > IP_public_internet_service.37086: P 2442974898:2442975723(825) ack 3490185997 win 254 <nop,nop,timestamp 159089094 440286443>

40: 03:39:25.586349 IP_public_internet_service.37106 > X.X.X.X.80: . ack 2359779938 win 68 <nop,nop,timestamp 440286500 159089091>

41: 03:39:25.661998 IP_public_internet_service.37086 > X.X.X.X.80: . ack 2442975723 win 68 <nop,nop,timestamp 440286573 159089094>

Capture out interface outside match tcp any any eq 80

Sh capture in

13: 03:38:32.512165 IP_public_internet_service.37086 > 192.168.0.5.80: S 1283918643:1283918643(0) win 17520 <mss 1380,nop,wscale 8,sackOK,timestamp 440233427 0>

14: 03:38:32.512455 192.168.0.5.80 > IP_public_internet_service.37086: S 2082273139:2082273139(0) ack 1283918644 win 8192 <mss 1460,nop,wscale 8,sackOK,timestamp 159083791 440233427>

15: 03:38:32.514057 IP_public_internet_service.37087 > 192.168.0.5.80: S 165090743:165090743(0) win 17520 <mss 1380,nop,wscale 8,sackOK,timestamp 440233430 0>

16: 03:38:32.514316 192.168.0.5.80 > IP_public_internet_service.37087: S 516623608:516623608(0) ack 165090744 win 8192 <mss 1460,nop,wscale 8,sackOK,timestamp 159083791 440233430>

17: 03:38:32.575913 IP_public_internet_service.37086 > 192.168.0.5.80: . ack 2082273140 win 68 <nop,nop,timestamp 440233492 159083791>

18: 03:38:32.577927 IP_public_internet_service.37087 > 192.168.0.5.80: . ack 516623609 win 68 <nop,nop,timestamp 440233494 159083791>

19: 03:38:32.582443 IP_public_internet_service.37086 > 192.168.0.5.80: P 1283918644:1283919080(436) ack 2082273140 win 68 <nop,nop,timestamp 440233499 159083791>

20: 03:38:32.611082 192.168.0.5.80 > IP_public_internet_service.37086: P 2082273140:2082273965(825) ack 1283919080 win 256 <nop,nop,timestamp 159083800 440233499>

21: 03:38:32.718941 IP_public_internet_service.37086 > 192.168.0.5.80: . ack 2082273965 win 65 <nop,nop,timestamp 440233631 159083800>

**Internally or locally it works , webserver is tested and running

**I added the same configuration but for telnet access and this works fine!, i can access the webserver for telnet by the Public IP.

Re: access to my webserver inside from outside ASA 9.x

balaji.bandi — Wed, 03 Jul 2019 20:39:15 GMT

Looks you have packet in and out going ok....do you have any other devices in between. also 192.168.0.5 - is this part of out bound NAT ?

if possible post full configuration.

Re: access to my webserver inside from outside ASA 9.x

alvarocomunicaciones — Wed, 03 Jul 2019 22:09:00 GMT

here my "sh run " :

ASA Version 9.6(1)

hostname FirewallPB

domain-name RRRRRR

enable password RRRRRR encrypted

passwd RRRRRR encrypted

names

ip local pool PoolPBusers 10.0.0.20-10.0.0.254 mask 255.255.255.0

interface GigabitEthernet1/1

mac-address 0000.0000.0000

nameif outside

security-level 0

ip address dhcp setroute

interface GigabitEthernet1/2

nameif inside

security-level 100

ip address 192.168.0.1 255.255.255.0

interface GigabitEthernet1/3

nameif backup_outside

security-level 0

ip address 192.168.1.66 255.255.255.0

interface GigabitEthernet1/4

shutdown

no nameif

no security-level

no ip address

interface GigabitEthernet1/5

shutdown

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 CST -6

clock summer-time CDT recurring 1 Sun Apr 2:00 last Sun Oct 2:00

dns domain-lookup outside

dns domain-lookup inside

dns server-group DefaultDNS

name-server 192.168.0.5 inside

domain-name RRRRRR

same-security-traffic permit inter-interface

same-security-traffic permit intra-interface

object network obj_any

subnet 0.0.0.0 0.0.0.0

object network NETWORK_OBJ_192.168.0.0_24

subnet 192.168.0.0 255.255.255.0

object network NETWORK_VPN

subnet 172.168.0.0 255.255.255.0

object network INSIDE

subnet 192.168.0.0 255.255.255.0

object network NETWORK_VPN2

subnet 10.0.0.0 255.255.255.0

object network INSIDE2

subnet 192.168.0.0 255.255.255.0

object network server-Web

host 192.168.0.5

object network server443-Web

host 192.168.0.5

object network OUTSIDE

host X.X.X.X

object service http-Web

service tcp source eq www

object network server-telnet

host 192.168.0.5

object-group protocol DM_INLINE_PROTOCOL_1

protocol-object udp

protocol-object tcp

object-group protocol DM_INLINE_PROTOCOL_2

protocol-object udp

protocol-object tcp

object-group protocol TCPUDP

protocol-object udp

protocol-object tcp

object-group network NETWORK_VPN12

network-object 172.168.0.0 255.255.255.0

network-object 10.0.0.0 255.255.255.0

access-list inside_access_in extended permit ip object NETWORK_OBJ_192.168.0.0_24 any

access-list inside_access_in extended permit icmp any any

access-list outside_access_in extended permit ip any any

access-list outside_access_in extended permit icmp any any

access-list outside_access_in extended permit tcp any object server-Web eq www

access-list outside_access_in extended permit tcp any object server-telnet eq telnet

access-list outside_access_in extended permit udp 10.0.0.0 255.255.255.0 192.168.0.0 255.255.255.0 eq sip

access-list outside_access_in extended permit udp 10.0.0.0 255.255.255.0 192.168.0.0 255.255.255.0 eq rip

access-list vpnRRRR_splitTunnelAcl standard permit 192.168.0.0 255.255.255.0

access-list vpnRRRR2_splitTunnelAcl2 standard permit 192.168.0.0 255.255.255.0

access-list DfltGrpPolicy_splitTunnelAcl standard permit 192.168.0.0 255.255.255.0

access-list DefaultRAGroup_splitTunnelAcl standard permit 192.168.0.0 255.255.255.0

pager lines 24

logging console debugging

logging buffered debugging

logging asdm informational

logging host inside 192.168.0.5

mtu outside 1500

mtu inside 1500

mtu backup_outside 1500

icmp unreachable rate-limit 1 burst-size 1

icmp permit 172.168.0.0 255.255.255.0 outside

icmp permit any outside

icmp permit 192.168.0.0 255.255.255.0 outside

icmp permit 192.168.0.0 255.255.255.0 inside

icmp permit 172.168.0.0 255.255.255.0 inside

icmp permit any inside

no asdm history enable

arp timeout 14400

arp permit-nonconnected

nat (inside,outside) source static INSIDE INSIDE destination static NETWORK_VPN2 NETWORK_VPN2

nat (inside,backup_outside) source dynamic NETWORK_OBJ_192.168.0.0_24 interface

object network NETWORK_OBJ_192.168.0.0_24

nat (inside,outside) dynamic interface

object network server-Web

nat (inside,outside) static interface service tcp www www

object network server-telnet

nat (inside,outside) static interface service tcp telnet telnet

access-group outside_access_in in interface outside

access-group inside_access_in in interface inside

route outside 0.0.0.0 0.0.0.0 X.X.X.Y 1 track 1

route backup_outside 0.0.0.0 0.0.0.0 192.168.1.254 2

route outside X.X.X.0 255.255.255.224 X.X.X.Y 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 192.168.0.0 255.255.255.0 inside

http authentication-certificate inside

no snmp-server location

no snmp-server contact

sla monitor 10

type echo protocol ipIcmpEcho 8.8.8.8 interface outside

frequency 5

sla monitor schedule 10 life forever start-time now

service sw-reset-button

crypto ipsec ikev1 transform-set my-transform-set-ikev1L2TP esp-des esp-sha-hmac

crypto ipsec ikev1 transform-set my-transform-set-ikev1L2TP mode transport

crypto ipsec security-association pmtu-aging infinite

crypto dynamic-map dyn0 10 set ikev1 transform-set my-transform-set-ikev1L2TP

crypto map inside_map interface inside

crypto map vpn 20 ipsec-isakmp dynamic dyn0

crypto map vpn interface outside

crypto ca trustpoint _SmartCallHome_ServerCA

no validation-usage

crl configure

crypto ca trustpool policy

crypto ca certificate chain _SmartCallHome_ServerCA

certificate ca 6ecc7aa5a7032009b8cebcf4e952d491

308205ec 308204d4 a0030201 0202106e cc7aa5a7 032009b8 cebcf4e9 52d49130

0d06092a 864886f7 0d010105 05003081 ca310b30 09060355 04061302 55533117

30150603 55040a13 0e566572 69536967 6e2c2049 6e632e31 1f301d06 0355040b

13165665 72695369 676e2054 72757374 204e6574 776f726b 313a3038 06035504

0b133128 63292032 30303620 56657269 5369676e 2c20496e 632e202d 20466f72

20617574 686f7269 7a656420 75736520 6f6e6c79 31453043 06035504 03133c56

65726953 69676e20 436c6173 73203320 5075626c 69632050 72696d61 72792043

65727469 66696361 74696f6e 20417574 686f7269 7479202d 20473530 1e170d31

30303230 38303030 3030305a 170d3230 30323037 32333539 35395a30 81b5310b

30090603 55040613 02555331 17301506 0355040a 130e5665 72695369 676e2c20

496e632e 311f301d 06035504 0b131656 65726953 69676e20 54727573 74204e65

74776f72 6b313b30 39060355 040b1332 5465726d 73206f66 20757365 20617420

68747470 733a2f2f 7777772e 76657269 7369676e 2e636f6d 2f727061 20286329

3130312f 302d0603 55040313 26566572 69536967 6e20436c 61737320 33205365

63757265 20536572 76657220 4341202d 20473330 82012230 0d06092a 864886f7

0d010101 05000382 010f0030 82010a02 82010100 b187841f c20c45f5 bcab2597

a7ada23e 9cbaf6c1 39b88bca c2ac56c6 e5bb658e 444f4dce 6fed094a d4af4e10

9c688b2e 957b899b 13cae234 34c1f35b f3497b62 83488174 d188786c 0253f9bc

7f432657 5833833b 330a17b0 d04e9124 ad867d64 12dc744a 34a11d0a ea961d0b

15fca34b 3bce6388 d0f82d0c 948610ca b69a3dca eb379c00 48358629 5078e845

63cd1941 4ff595ec 7b98d4c4 71b350be 28b38fa0 b9539cf5 ca2c23a9 fd1406e8

18b49ae8 3c6e81fd e4cd3536 b351d369 ec12ba56 6e6f9b57 c58b14e7 0ec79ced

4a546ac9 4dc5bf11 b1ae1c67 81cb4455 33997f24 9b3f5345 7f861af3 3cfa6d7f

81f5b84a d3f58537 1cb5a6d0 09e4187b 384efa0f 02030100 01a38201 df308201

db303406 082b0601 05050701 01042830 26302406 082b0601 05050730 01861868

7474703a 2f2f6f63 73702e76 65726973 69676e2e 636f6d30 12060355 1d130101

ff040830 060101ff 02010030 70060355 1d200469 30673065 060b6086 480186f8

45010717 03305630 2806082b 06010505 07020116 1c687474 70733a2f 2f777777

2e766572 69736967 6e2e636f 6d2f6370 73302a06 082b0601 05050702 02301e1a

1c687474 70733a2f 2f777777 2e766572 69736967 6e2e636f 6d2f7270 61303406

03551d1f 042d302b 3029a027 a0258623 68747470 3a2f2f63 726c2e76 65726973

69676e2e 636f6d2f 70636133 2d67352e 63726c30 0e060355 1d0f0101 ff040403

02010630 6d06082b 06010505 07010c04 61305fa1 5da05b30 59305730 55160969

6d616765 2f676966 3021301f 30070605 2b0e0302 1a04148f e5d31a86 ac8d8e6b

c3cf806a d448182c 7b192e30 25162368 7474703a 2f2f6c6f 676f2e76 65726973

69676e2e 636f6d2f 76736c6f 676f2e67 69663028 0603551d 11042130 1fa41d30

1b311930 17060355 04031310 56657269 5369676e 4d504b49 2d322d36 301d0603

551d0e04 1604140d 445c1653 44c1827e 1d20ab25 f40163d8 be79a530 1f060355

1d230418 30168014 7fd365a7 c2ddecbb f03009f3 4339fa02 af333133 300d0609

2a864886 f70d0101 05050003 82010100 0c8324ef ddc30cd9 589cfe36 b6eb8a80

4bd1a3f7 9df3cc53 ef829ea3 a1e697c1 589d756c e01d1b4c fad1c12d 05c0ea6e

b2227055 d9203340 3307c265 83fa8f43 379bea0e 9a6c70ee f69c803b d937f47a

6decd018 7d494aca 99c71928 a2bed877 24f78526 866d8705 404167d1 273aeddc

481d22cd 0b0b8bbc f4b17bfd b499a8e9 762ae11a 2d876e74 d388dd1e 22c6df16

b62b8214 0a945cf2 50ecafce ff62370d ad65d306 4153ed02 14c8b558 28a1ace0

5becb37f 954afb03 c8ad26db e6667812 4ad99f42 fbe198e6 42839b8f 8f6724e8

6119b5dd cdb50b26 058ec36e c4c875b8 46cfe218 065ea9ae a8819a47 16de0c28

6c2527b9 deb78458 c61f381e a4c4cb66

quit

crypto isakmp nat-traversal 1500

crypto ikev1 enable outside

crypto ikev1 policy 1

authentication pre-share

encryption 3des

hash sha

group 2

lifetime 86400

crypto ikev1 policy 105

authentication pre-share

encryption des

hash sha

group 5

lifetime 86400

crypto ikev1 policy 110

authentication rsa-sig

encryption 3des

hash sha

group 2

lifetime 86400

crypto ikev1 policy 140

authentication rsa-sig

encryption des

hash sha

group 2

lifetime 86400

track 1 rtr 10 reachability

telnet 192.168.0.0 255.255.255.255 inside

telnet 192.168.0.0 255.255.255.0 inside

telnet timeout 5

ssh stricthostkeycheck

ssh 0.0.0.0 0.0.0.0 outside

ssh 192.168.0.0 255.255.255.0 inside

ssh timeout 60

ssh key-exchange group dh-group1-sha1

console timeout 0

l2tp tunnel hello 10

vpnclient mode client-mode

dhcp-client broadcast-flag

dhcp-client client-id interface outside

dhcp-client update dns server both

dhcpd auto_config outside

dhcpd auto_config outside interface inside

group-policy DfltGrpPolicy attributes

dns-server value 192.168.0.6

vpn-tunnel-protocol l2tp-ipsec

ipsec-udp enable

split-tunnel-policy tunnelspecified

split-tunnel-network-list value DfltGrpPolicy_splitTunnelAcl

default-domain value RRRR

intercept-dhcp 255.255.255.255 enable

dynamic-access-policy-record DfltAccessPolicy

password-policy minimum-length 8

password-policy minimum-numeric 1

username QQQQ password WaKWIqHAGPBEqRykpBAZTQ== nt-encrypted

username QQQQ attributes

vpn-group-policy DfltGrpPolicy

vpn-tunnel-protocol l2tp-ipsec

username QQQQ password bz2VV2kvnATtLqPC encrypted

username QQQQ password lovDDFTjdoz6uuzuvcQ9yA== nt-encrypted

username QQQQ attributes

vpn-group-policy DfltGrpPolicy

vpn-tunnel-protocol l2tp-ipsec

username QQQQ password x5YoIfxMOWmrH47Q encrypted

username QQQQ attributes

vpn-group-policy QQQQQQQQQ

username QQQQ password t9yf/Q4Nsy71.hz1 encrypted

username QQQQ password /kZjBaTTvTWggIKMVMzTfA== nt-encrypted

username QQQQ attributes

vpn-group-policy DfltGrpPolicy

vpn-tunnel-protocol l2tp-ipsec

username QQQQ password a13mDAwRdkFXIKhrRr4v+w== nt-encrypted

username QQQQ attributes

vpn-group-policy DfltGrpPolicy

vpn-tunnel-protocol l2tp-ipsec

username QQQQ password 4I0Qgu2HpAvV01ZF encrypted

username QQQQ password sZd4TXTEoZotkUEOPhFSNw== nt-encrypted

username QQQQ attributes

vpn-group-policy DfltGrpPolicy

vpn-tunnel-protocol l2tp-ipsec

username QQQQ password 7oqzXVQaCfcF7OE2 encrypted

username QQQQ password uXxtjr3i/7c5D6lcKxMuHA== nt-encrypted

username QQQQ attributes

vpn-group-policy DfltGrpPolicy

vpn-tunnel-protocol l2tp-ipsec

username QQQQ password doucIWDjqw1jhlejSJpAhg== nt-encrypted privilege 15

username QQQQ attributes

vpn-group-policy DfltGrpPolicy

vpn-tunnel-protocol l2tp-ipsec

username QQQQ password Password7 nt-encrypted

username QQQQ 1 attributes

vpn-group-policy DfltGrpPolicy

vpn-tunnel-protocol l2tp-ipsec

tunnel-group DefaultRAGroup general-attributes

address-pool PoolPBusers

tunnel-group DefaultRAGroup ipsec-attributes

ikev1 pre-shared-key *****

tunnel-group DefaultRAGroup ppp-attributes

authentication ms-chap-v2

class-map netbios_NBS

match default-inspection-traffic

class-map inspection_default

match default-inspection-traffic

class-map outisde_ping

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 icmp error

class class-default

user-statistics accounting

set connection decrement-ttl

policy-map ICMP

class outisde_ping

inspect icmp

policy-map NBS

class netbios_NBS

inspect netbios

service-policy global_policy global

prompt hostname context

call-home reporting anonymous

hpm topN enable

Cryptochecksum:rrrrrrrrrrrrrrrrrrr

: end