Solved: Re: Host in DMZ cannot get outside (ASA 5505) - Page 2

ralf.rottmann · ‎05-14-2012

Hi there,

Based on the configuration pasted below, we believe the host (10.0.2.200 / 255.255.255.0 GW: 10.0.2.1 with external DNS servers configured) should have access to the web. However, it cannot resolve any names nor can it connect outside. Any idea why? Your help is greatly appreciated.

Here is the config:

ciscoasa# show running-configuration

^

ERROR: % Invalid input detected at '^' marker.

ciscoasa# show runn

ciscoasa# show running-config

: Saved

:

ASA Version 8.4(3)

!

hostname ciscoasa

enable password *** encrypted

passwd *** encrypted

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

switchport access vlan 12

!

interface Vlan1

nameif inside

security-level 100

ip address 10.0.1.1 255.255.255.0

!

interface Vlan2

nameif outside

security-level 0

ip address 195.14.245.70 255.255.255.224

!

interface Vlan12

nameif dmz

security-level 50

ip address 10.0.2.1 255.255.255.0

!

ftp mode passive

dns domain-lookup inside

dns domain-lookup outside

dns server-group DefaultDNS

name-server 194.8.194.60

name-server 213.168.112.60

object network obj_any

subnet 0.0.0.0 0.0.0.0

pager lines 24

logging enable

logging asdm informational

mtu inside 1500

mtu outside 1500

mtu dmz 1500

no failover

icmp unreachable rate-limit 1 burst-size 1

no asdm history enable

arp timeout 14400

!

object network obj_any

nat (inside,outside) dynamic interface

route outside 0.0.0.0 0.0.0.0 195.14.245.65 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

aaa authentication ssh console LOCAL

http server enable

http 10.0.1.0 255.255.255.0 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 ca trustpoint _SmartCallHome_ServerCA

crl configure

crypto ca certificate chain _SmartCallHome_ServerCA

certificate ca 6ecc7aa5a7032009b8cebcf4e952d491

***

quit

telnet timeout 5

ssh 10.0.1.0 255.255.255.0 inside

ssh 0.0.0.0 0.0.0.0 outside

ssh timeout 5

console timeout 0

dhcpd dns 194.8.194.60 213.168.112.60

dhcpd auto_config inside

!

threat-detection basic-threat

threat-detection statistics

threat-detection statistics tcp-intercept rate-interval 30 burst-rate 400 average-rate 200

webvpn

username *** password *** encrypted privilege 15

!

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

class class-default

user-statistics accounting

!

service-policy global_policy global

prompt hostname context

call-home reporting anonymous

hpm topN enable

Cryptochecksum:***

: end

Amos Kafwembe · ‎12-18-2012

hello.

I dont mean to highjack this thread but I have a similar situation as this one, only that i would like to NAT only my webserver which is the DMZ to the outside on a specified IP address and not PAT. my firewall wont allow the command

nat (dmz,outside) dynamic interface.

unless, nat (dmz) 1......................................(am not certain how the command shoule end.

how can i do this translation so that my webserver can be seen? also, i need it to be seen only on ports 80,443 and 20.

thanks.

Jouni Forss · ‎12-18-2012

Hi,

With ASA software 8.3 and above the configuration format is the following

Port Forward Configuration using the "outside" interface public IP address

object network STATIC-TCP20

host 10.10.10.10

nat (dmz,outside) static interface service tcp 20 20

object network STATIC-TCP80

host 10.10.10.10

nat (dmz,outside) static interface service tcp 80 80

object network STATIC-TCP443

host 10.10.10.10

nat (dmz,outside) static interface service tcp 443 443

access-list OUTSIDE-IN permit tcp any object STATIC-TCP20 eq 20

access-list OUTSIDE-IN permit tcp any object STATIC-TCP80 eq 80

access-list OUTSIDE-IN permit tcp any object STATIC-TCP443 eq 443

access-group OUTSIDE-IN in interface outside

Where

10.10.10.10 = example DMZ host IP address
STATIC-TCPxx = object name for each translation/portforward
OUTSIDE-IN = example outside interface ACL name
access-group = attach the ACL to outside interface (unless you already have an ACL attached)

IF you have a dedicated public IP address for the server -> REPLACE "interface" with the public IP address.

object network STATIC-DMZ

host 10.10.10.10

nat (dmz,outside) static 1.2.3.4

access-list OUTSIDE-IN permit tcp any object STATIC-DMZ eq 20

access-list OUTSIDE-IN permit tcp any object STATIC-DMZ eq 80

access-list OUTSIDE-IN permit tcp any object STATIC-DMZ eq 443

access-group OUTSIDE-IN in interface outside

Where

10.10.10.10 = example DMZ host IP address
STATIC-DMZ = object name for the 1:1 Static NAT (in other words 10.10.10.10 owns this public IP address)
1.2.3.4 = example public IP address

If this solves your question please rate. Otherwise make another thread asking about this (copy/paste content there perhaps) and we will look furhter.

- Jouni

Amos Kafwembe · ‎12-18-2012

Hi,

thanks for taking time to respond. my ASA version is pasted below. The command line is quite different.

ciscoasa# sh run

: Saved

:

ASA Version 7.2(4)

!

hostname ciscoasa

domain-name default.domain.invalid

enable password Cxy6Egno9r1.xcqd encrypted

passwd 2KFQnbNIdI.2KYOU encrypted

Jouni Forss · ‎12-18-2012

Ah,

Missunderstood/missread your post then.

With the above software level the NAT command format is the following (unless I typo something or remember wrong)

Port Forward (Using "outside" interface IP address)

static (dmz,outside) tcp interface 20 10.10.10.10 20 netmask 255.255.255.255

static (dmz,outside) tcp interface 80 10.10.10.10 80 netmask 255.255.255.255

static (dmz,outside) tcp interface 443 10.10.10.10 443 netmask 255.255.255.255

access-list OUTSIDE-IN permit tcp any host eq 20

access-list OUTSIDE-IN permit tcp any host eq 80

access-list OUTSIDE-IN permit tcp any host eq 443

Static NAT (Using own public IP address for server)

static (dmz,outside) 1.2.3.4 10.10.10.10 netmask 255.255.255.255

access-list OUTSIDE-IN permit tcp any host 1.2.3.4 eq 20

access-list OUTSIDE-IN permit tcp any host 1.2.3.4 eq 80

access-list OUTSIDE-IN permit tcp any host 1.2.3.4 eq 443

- Jouni

Amos Kafwembe · ‎12-18-2012

thanks for this......but now i need my webserver to be accessible form the inside as well. because i cant even ping it from inside. how do i enable communication between the web server and the inside network?