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822 Views 2 Replies Latest reply: Jun 20, 2012 7:31 AM by Eminence_Front RSS

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i cannot access to internet behind asa

Apr 24, 2012 12:46 PM

Mohamed 12 posts since
Nov 27, 2011

hello for all

i bought cisco asa 5540
i have cisco router 2811 with static ip
and make nat to conected to internet pat nat
and have for exchange server


i want to confiure asa behind router
i mean leave all configure on cisco router
when i make out side and inside lan all is ok
but all pc conected on inside interface of asa 5540 cannot access to internet
and also cannot ping from pc ip on interface outside i permet icmp in servise poilcy and incpection icmp
but i mean no conection not ping only
my senaro

lan------------------ asa -------------------- cisco router ----------internet


i will post configration for asa

ASA Version 8.4(2)
hostname ciscoasa
enable password 8Ry2YjIyt7RR24 encrypted


interface GigabitEthernet0/0
nameif outside
security-level 0
ip address
interface GigabitEthernet0/1
nameif inside
security-level 100
ip address
interface GigabitEthernet0/2
no nameif
no security-level
no ip address
interface GigabitEthernet0/3
no nameif
no security-level
no ip address
interface Management0/0
nameif management
security-level 100
ip address
same-security-traffic permit inter-interface
same-security-traffic permit intra-interface
access-list OUTSIDE extended permit ip any any
access-list inside_access_in extended permit ip any any
access-list cap extended permit icmp any host
access-list cap extended permit icmp host any
access-group OUTSIDE in interface outside
access-group inside_access_in in interface inside
route inside 1




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
my router access to internet and all lan access to intenet without asa

so what is missing or wrong conigration to access to internet

best regards

  • Scott Morris - CCDE/4xCCIE/2xJNCIE 8,429 posts since
    Oct 7, 2008
    Currently Being Moderated
    1. Apr 27, 2012 6:51 AM (in response to Mohamed)
    Re: i cannot access to internet behind asa

    On your firewall there, you are using private addresses for inside and outside...


    You don't appear to have any NAT configuration or statics.  The ASA needs to have an xlate table entry one way or the other, even if things aren't changing.


    Try upping your logging to debug and see what errors are popping up on the ASA as you try to move traffic through, that will likely help you!



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  • Eminence_Front 8 posts since
    Apr 17, 2011

    Missing NAT config (which version Code, on ASA, and we can help you ?)


    2.) need a return route on the Router, telling internet sourced traffic how to reach hosts behind ASA. (e.g. if you're going to NAT the Exchange behind a pub IP on the ASA< you need to make ASA next hop inbound, in your Router, for that Network / Host-IP)


    You need




    pubIP--<Inside-192>--->--->(NAT) ASA---<natted_IP>---> ((INET_Router)pub_Internet


    upon return, it looks like this


    INET-HOST--->"Some-Pub-IP"---<<your router>>-->-->--(where do i go?)--|<ASA>>|--192-lan

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