Re: ASA 5520 - No Internet Access Inside

woodjl16501 · ‎09-23-2018

I am trying to configure my ASA 5520 for my home network environment. Cox is my ISP and have their provided router. My plan is to turn on bridge mode and turn that into a modem. I did a test and I was able to ping from the ASA to the outside, however, from the inside it fail. I believe it is a NAT issues, but I can't seem to pin point where I am going wrong. Could someone take a look at my config and provide some assistance?

Cox Router > Cisco 3560 Switch FA 0/2 > ASA 5520 via Switch FA0/2 (vlan 100)

ASA Gigabit 0/1 > Switch FA03 (vlan 200)

HomeLAN 192.168.0.0/24

ISP = DHCP IP (no static available)

: Saved
: Written by woodjl1650 at 23:09:15.339 UTC Sat Sep 22 2018
!
ASA Version 8.0(4)
!
hostname Firewall
enable password d3NY0EIx4U2Ue0kB encrypted
passwd 2KFQnbNIdI.2KYOU encrypted
names
!
interface GigabitEthernet0/0
nameif outside
security-level 0
ip address dhcp setroute
!
interface GigabitEthernet0/1
nameif inside
security-level 100
ip address 192.168.0.2 255.255.255.0
!
interface GigabitEthernet0/2
shutdown
no nameif
no security-level
no ip address
!
interface GigabitEthernet0/3
shutdown
no nameif
no security-level
no ip address
!
interface Management0/0
shutdown
no nameif
no security-level
no ip address
management-only
!
ftp mode passive
pager lines 24
logging enable
logging asdm informational
mtu outside 1500
mtu inside 1500
no failover
icmp unreachable rate-limit 1 burst-size 1
asdm image disk0:/asdm-792-152.bin
no asdm history enable
arp timeout 14400
static (inside,outside) interface 192.168.0.1 netmask 255.255.255.255
route outside 0.0.0.0 0.0.0.0 68.102.208.1 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
dynamic-access-policy-record DfltAccessPolicy
http server enable
http 192.168.0.0 255.255.255.0 inside
no snmp-server location
no snmp-server contact
crypto ipsec security-association lifetime seconds 28800
crypto ipsec security-association lifetime kilobytes 4608000
telnet timeout 5
ssh timeout 5
console timeout 0
threat-detection basic-threat
threat-detection statistics access-list
no threat-detection statistics tcp-intercept
username woodjl1650 password IRumUYC8YqPNIKcG encrypted privilege 15
!
class-map inspection_default
match default-inspection-traffic
!
!
policy-map type inspect dns preset_dns_map
parameters
message-length maximum 512
message-length maximum client auto
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
Cryptochecksum:a704b19c603b69a28a869a6552106d0b
: end

evlaa1990 · ‎09-23-2018

If you have the setroute option on the outside interface you shouldn't need any static 0.0.0.0 routes this will be picked up dynamically. Pre 8.4 software you'll use something like the below config for general inside --> outside PAT.

global (outside) 1 interface

nat (inside) 1 0.0.0.0 0.0.0.0

Ajay Saini · ‎09-23-2018

Hello,

There is a static statement which is incorrect, please remove it:

static (inside,outside) interface 192.168.0.1 netmask 255.255.255.255

also, you would need to enable PAT as suggested by @evlaa1990 and also ICMP inspection to allow icmp traffic through the firewall.

global (outside) 1 interface

nat (inside) 1 0.0.0.0 0.0.0.0

policy-map global_policy
class inspection_default

inspect icmp

Please try and let us know the results.

HTH

AJ

woodjl16501 · ‎09-24-2018

Thanks, I will try that today. Also, what is the proper coding line for post 8.4? I don't know why it shows my software version as 8.0.4, I updated the IOS and my ASDM show 9.0.

evlaa1990 · ‎09-24-2018

I'm not too sure why thats showing like that. Definitely looks like pre 8.4 software based on the nat config thats i place.

I'd be more inclined to go with the version shown on the console than ASDM but a 'show version' will clear that up.

Let us know how you get on?

evlaa1990 · ‎09-24-2018

proper nat config for post 8.4 for general pat configuration of the outside interface ip:
object network obj_any
subnet 0.0.0.0 0.0.0.0
nat (any,outside) dynamic interface