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Can't reach internet through ASA

lukasmuzik
Level 1
Level 1

Hi everyone,

I'm trying set up ASA in test lab and have issue witch internet connectivity. Since it's my first experience with this device I've followed documentation and think everything is configured correctly. I can reach internet from ASA's outside interface, but not from inside interface or client which is connected to inside interface. After some research about access-list rules I'am even able ping trough ASA from client device, but still can't find out where's a catch about other traffic like http. In case of http, similiar acces-list like with ping didn't work. Maybe i'm overlooking something obvious, but don't see it.

I've followed for initial configuration this guide http://www.firewall.cx/cisco-technical-knowledgebase/cisco-firewalls/964-cisco-asa5500-startup.html and everything worked fine with exception I can't reach internet. Bellow is my running-config file and i would be really glad for some help cause I'm stuck at this few days.

: Saved

:

ASA Version 8.4(7)

!

hostname ASA-test

enable password xxx encrypted

passwd xxx encrypted

names

!

interface Ethernet0/0

switchport access vlan 2

!

interface Ethernet0/1

!

interface Ethernet0/2

shutdown

!

interface Ethernet0/3

shutdown

!

interface Ethernet0/4

shutdown

!

interface Ethernet0/5

shutdown

!

interface Ethernet0/6

shutdown

!

interface Ethernet0/7

shutdown

!

interface Vlan1

description PRIVATE-INT

nameif inside

security-level 100

ip address 10.0.2.1 255.255.255.0

!

interface Vlan2

description PUBLIC-INT

nameif outside

security-level 0

ip address 10.0.1.250 255.0.0.0

!

boot system disk0:/asa847-k8.bin

ftp mode passive

object network INSIDE-NET

subnet 10.0.2.0 255.255.255.0

access-list 10 extended permit icmp any any echo-reply

access-list 10 extended permit icmp any any source-quench

access-list 10 extended permit icmp any any unreachable

access-list 10 extended permit icmp any any time-exceeded

access-list 10 extended permit tcp any any eq www

access-list 10 extended permit tcp any any eq 433

access-list 10 extended permit tcp any any eq ftp

access-list 10 extended permit tcp any any eq ftp-data

access-list in-to-out extended permit ip any any

pager lines 24

mtu outside 1500

mtu inside 1500

icmp unreachable rate-limit 1 burst-size 1

no asdm history enable

arp timeout 14400

no arp permit-nonconnected

!

object network INSIDE-NET

nat (inside,outside) dynamic interface

access-group 10 in interface outside

route outside 0.0.0.0 0.0.0.0 10.0.1.138 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

aaa authentication http console LOCAL

http server enable

http 10.0.2.0 255.255.255.0 inside

http 10.0.0.0 255.0.0.0 outside

no snmp-server location

no snmp-server contact

snmp-server enable traps snmp authentication linkup linkdown coldstart

telnet timeout 5

ssh 10.0.0.0 255.0.0.0 outside

ssh 10.0.2.0 255.255.255.0 inside

ssh timeout 15

ssh key-exchange group dh-group1-sha1

console timeout 0

dhcpd address 10.0.2.11-10.0.2.42 inside

dhcpd enable inside

!

threat-detection basic-threat

threat-detection statistics access-list

no threat-detection statistics tcp-intercept

webvpn

username admin password xxx 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 ip-options

  inspect netbios

  inspect rsh

  inspect rtsp

  inspect skinny

  inspect esmtp

  inspect sqlnet

  inspect sunrpc

  inspect tftp

  inspect sip

  inspect xdmcp

!

service-policy global_policy global

prompt hostname context

no call-home reporting anonymous

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

Cryptochecksum:4bf95663b6dfcf18d3972af9864ce138

: end

no asdm history enable

1 Accepted Solution

Accepted Solutions

If you issue an nslookup google.com what output do you get?

if you issue the command ipconfig /all what values do you see for DNS server?

I suggest adding the following command and then test again:

dhcpd dns 4.2.2.2

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View solution in original post

5 Replies 5

Your outside interface subnet also includes the subnet that is assigned to your inside interface. Since this is a lab I would assume you can change this outside interface subnet mask?  since your default route points to 10.0.1.138 I am assuming that this IP also has a subnet of /8?  This will cause both the ASA and router connected to the ASA to believe they are directly connected to the 10.0.2.0/24 network on the outside interface and this traffic will never be routed by the ASA.  Change it to a /24 and then test.

If that doesn't work, which interface are you connecting the PC to?  As of right now only interface Eth0/1 is active.

Have you checked that your PC is getting the correct IP from the DHCP on the ASA?

Normally I would tell you to remove these commands, but since you say this is a lab setup...up to you  

http 10.0.0.0 255.0.0.0 outside

ssh 10.0.0.0 255.0.0.0 outside

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Hi Marius,

thank you for response. I tried your advice and changed outside interface subnet to /24 but it doesn´t help. Interface is fine, I keep just that one up and test one PC pluged in. DHCP is corret too. As I mentioned I can ping to internet but can´t reach other services. I assume if it would be problem with routing I couldn´t even ping. I think it must be something with default access-list setting what is denying packets. Any other ideas? I´m already mad with this issue:-)

If you issue an nslookup google.com what output do you get?

if you issue the command ipconfig /all what values do you see for DNS server?

I suggest adding the following command and then test again:

dhcpd dns 4.2.2.2

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Well, that was easy. I haven't configured dns server from dhcp server. Thank you for help:-)

Any time

Glad I could help

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