ASA 5505 inside has no internet

Posted on 2011-05-04
Last Modified: 2012-05-11

I am very new to Cisco and the ASA 5505.  I have combed the internet and used both CLI and ASDM settings to try to get just a basic LAN to work.  So far, I have been unsuccessful.

I can ping, and connect on the inside network, but the inside network has no internet access.  I don't think it is DNS, because
I cannot ping a known IP address.

I have attached the setup code.
I would be grateful if someone could help me debug this problem, and also if you have any suggestions to make
regarding my setup.

I am using the ASA 5505 as a firewall and DHCP and router.  

T1 router (bridged) --> ASA 5505 (static IP) -->inside/green interface (

If I need to add another router to the mix, please let me know -
  such as:  
T1 router (bridged) --> ASA 5505 (static IP) -->router -->inside/green interface (
but this would result in double-nat/PAT, right?

I also have to do some subnet vpns and a VPN that is PAT-ed to a single IP, but that is for a later topic,
after I get this working.

Thanks in advance for your help!

ASA001> enable
Password: **************
ASA001# show run
: Saved
ASA Version 8.2(1)
hostname ASA001
enable password PbitEKx51FsLXrKh encrypted
passwd 2ASQnbNIdI.2KYOU encrypted
interface Vlan1
 nameif inside
 security-level 100
 ip address
interface Vlan2
 nameif outside
 security-level 0
 ip address aaa.bbb.ccc.ddd
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
ftp mode passive
clock timezone MST -7
clock summer-time MDT recurring
dns domain-lookup inside
dns domain-lookup outside
dns server-group DefaultDNS
pager lines 24
logging enable
logging asdm informational
mtu inside 1500
mtu outside 1500
no failover
icmp unreachable rate-limit 1 burst-size 1
no asdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 1
route outside aaa.bbb.ccc.ddd 1
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
dynamic-access-policy-record DfltAccessPolicy
http server enable
http inside
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart
crypto ipsec security-association lifetime seconds 28800
crypto ipsec security-association lifetime kilobytes 4608000
telnet timeout 5
ssh timeout 5
console timeout 0
dhcpd auto_config outside
dhcpd address inside
dhcpd dns interface inside
dhcpd wins interface inside
dhcpd lease 86400 interface inside
dhcpd ping_timeout 200 interface inside
dhcpd domain metronews.local interface inside
dhcpd enable inside

threat-detection basic-threat
threat-detection statistics port
threat-detection statistics protocol
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
  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
service-policy global_policy global
prompt hostname context
: end

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Question by:pootwaddle
    LVL 6

    Expert Comment

    your global outside and nat inside statements are correct,
    did you verify that the ASA is able to reach the internet ?
    howe about a show xlate when trying a connection to internet from an internal PC?
    LVL 35

    Expert Comment

    by:Ernie Beek
    For starters try:

    access-list outside permit icmp any any
    access-group outside in interface outside


    policy-map global_policy
     class inspection_default
      inspect icmp

    Author Comment

    thanks for the suggestions.  I have made the changes.  My ASA 5505 is currently off-line and I will swap it in at the next break
    (so I don't interrupt production as swapping routers will kill what we do here)

    I hope I am clear, I am less concerned about "ping" (it is only a tool I use) than "normal" internet connectivity to
    websites, etc.  
    I added the icmp permit group of statements, though.

    Thanks so far - with your help I think I am getting closer!
    LVL 16

    Accepted Solution

    Just to be clear, you have another device that terminates the T1 connection?  I would check with your ISP and make sure that your ASA is configured with the correct default route to their default gateway / next hop router.  Your config looks good.  My guess would be either the wrong default route configured or a problem with the T1 link not being set up correctly.
    LVL 9

    Expert Comment

    When you swap in the ASA5505, you might need to reboot the upstream router.  That router may cache the IP number assigned to the old firewall and not map it to the new mac address on the ASA5505.  Rebooting that device will clear that issue.

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