Question

ASA 5505 ASDM Not Accessible Via Outside Interface

Asked by: artisit

I am using AT&T DSL business service and have a block of IP addresses assigned.  The default gateway is aaa.bbb.ccc.33.  The aaa.bbb.ccc.34 IP is assigned to the ASA.  I'd like to use the aaa.bbb.ccc.35 IP and create a static NAT to translate to the 192.168.1.3 private address.

I have several issues with the configuration of the ASA.

1) I cannot ping the .34 or .35 IP address from the outside
2) I don't think the NAT between .35 and private address 192.168.1.3 is working
3) I cannot connect to the ASA via ASDM or SSH from the outside.  I can connect fine from the inside via HTTPS.

Below is my running config.

Please help!

: Saved
:
ASA Version 8.2(1) 
!
hostname ciscoasa
domain-name somedomain.com
enable password Mg3MrIpbJfwZiy0/ encrypted
passwd 2KFQnbNIdI.2KYOU encrypted
names
!
interface Vlan1
 nameif inside
 security-level 100
 ip address 192.168.1.1 255.255.255.0 
!
interface Vlan2
 nameif outside
 security-level 0
 ip address aaa.bbb.ccc.34 255.255.255.248 
!
interface Vlan5
 no forward interface Vlan1
 nameif dmz
 security-level 50
 no ip address
!
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
dns server-group DefaultDNS
 domain-name somedomain.com
access-list name extended permit icmp any interface outside 
access-list outside_access_in extended permit icmp any any 
access-list outside_access_in remark smtp for small business server
access-list outside_access_in extended permit tcp any host 192.168.1.3 eq smtp 
access-list outside_access_in remark http for small business server
access-list outside_access_in extended permit tcp any host 192.168.1.3 eq www 
access-list outside_access_in remark https for small business server
access-list outside_access_in extended permit tcp any host 192.168.1.3 eq https 
access-list inside_access_in extended permit ip any any 
pager lines 24
logging enable
logging asdm informational
mtu inside 1500
mtu outside 1500
mtu dmz 1500
icmp unreachable rate-limit 1 burst-size 1
no asdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 1 0.0.0.0 0.0.0.0
static (outside,inside) 192.168.1.3 aaa.bbb.ccc.35 netmask 255.255.255.255 
access-group inside_access_in in interface inside
access-group outside_access_in in interface outside
route outside 0.0.0.0 0.0.0.0 aaa.bbb.ccc.33 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 192.168.1.0 255.255.255.0 inside
http myremoteip1 255.255.255.255 outside
http myremoteip2 255.255.255.255 outside
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
crypto ipsec security-association lifetime seconds 28800
crypto ipsec security-association lifetime kilobytes 4608000
telnet timeout 5
ssh myremoteip2 255.255.255.255 outside
ssh timeout 5
console timeout 0
dhcpd auto_config outside
!
dhcpd address 192.168.1.100-192.168.1.200 inside
dhcpd dns 192.168.1.2 208.67.222.222 interface inside
dhcpd wins 192.168.1.2 interface inside
dhcpd domain dominexeggplant.com interface inside
dhcpd enable inside
!
 
threat-detection basic-threat
threat-detection statistics access-list
no threat-detection statistics tcp-intercept
webvpn
username supportuser password 19/2Wr9hnvSghpI9 encrypted privilege 15
!
class-map inspection_default
 match default-inspection-traffic
!
!
policy-map type inspect dns preset_dns_map
 parameters
  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 
Cryptochecksum:163e61f9705575401f2d9590bb6593aa
: end
no asdm history enable

                                  
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Asked On
2009-08-13 at 19:20:18ID24651849
Topics

Cisco PIX Firewall

,

IPSec Security Protocol

,

Network Routers

Participating Experts
1
Points
500
Comments
14

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Answers

 

by: kenboonejrPosted on 2009-08-13 at 19:34:40ID: 25094882

You static statement is backwards
It should be

Make sure you delete the other command and then issue clear xlate command before adding this.
static (inside,outside)  aaa.bbb.ccc.35 192.168.1.3 netmaskk 255.255.255.255

Then you need to re-do the acl that allows access to this box.  So everywhere you defined 192.168.1.3 should be aaa.bbb.ccc.35.

Also get rid of the acl called inside_access_in
It is not needed.

That will resolve part of your problem.


Did you issue the command "crypto key generate rsa modulus 1024" to create the key needed for ssh?

 

by: artisitPosted on 2009-08-13 at 19:43:20ID: 25094906

I made these changes but pings still fail and no access to device at 192.168.1.3 :-(

 

by: kenboonejrPosted on 2009-08-13 at 19:47:53ID: 25094927

did you apply the acl back when you changed it?  post the current config for me.

 

by: artisitPosted on 2009-08-13 at 20:03:13ID: 25094972

here's the update config

: Saved
:
ASA Version 8.2(1) 
!
hostname ciscoasa
domain-name somedomain.com
enable password Mg3MrIpbJfwZiy0/ encrypted
passwd 2KFQnbNIdI.2KYOU encrypted
names
!
interface Vlan1
 nameif inside
 security-level 100
 ip address 192.168.1.1 255.255.255.0 
!
interface Vlan2
 nameif outside
 security-level 0
 ip address aaa.bbb.ccc.34 255.255.255.248 
!
interface Vlan5
 no forward interface Vlan1
 nameif dmz
 security-level 50
 no ip address
!
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
dns server-group DefaultDNS
 domain-name somedomain.com
access-list name extended permit icmp any interface outside 
access-list outside_access_in extended permit icmp any any 
access-list outside_access_in remark smtp for small business server
access-list outside_access_in extended permit tcp any host 192.168.1.3 eq smtp 
access-list outside_access_in remark http for small business server
access-list outside_access_in extended permit tcp any host 192.168.1.3 eq www 
access-list outside_access_in remark https for small business server
access-list outside_access_in extended permit tcp any host 192.168.1.3 eq https 
pager lines 24
logging enable
logging asdm informational
mtu inside 1500
mtu outside 1500
mtu dmz 1500
icmp unreachable rate-limit 1 burst-size 1
no asdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 1 0.0.0.0 0.0.0.0
static (inside,outside) aaa.bbb.ccc.35 192.168.1.3 netmask 255.255.255.255 
access-group outside_access_in in interface outside
route outside 0.0.0.0 0.0.0.0 aaa.bbb.ccc.33 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 192.168.1.0 255.255.255.0 inside
http 192.168.0.0 255.255.255.0 inside
http myip1 255.255.255.255 outside
http myip2 255.255.255.255 outside
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
crypto ipsec security-association lifetime seconds 28800
crypto ipsec security-association lifetime kilobytes 4608000
telnet timeout 5
ssh myip2 255.255.255.255 outside
ssh timeout 5
console timeout 0
dhcpd auto_config outside
!
dhcpd address 192.168.1.100-192.168.1.200 inside
dhcpd dns 192.168.1.2 208.67.222.222 interface inside
dhcpd wins 192.168.1.2 interface inside
dhcpd domain somedomain.com interface inside
dhcpd enable inside
!
 
threat-detection basic-threat
threat-detection statistics access-list
no threat-detection statistics tcp-intercept
webvpn
username artis.support password 19/2Wr9hnvSghpI9 encrypted privilege 15
!
class-map inspection_default
 match default-inspection-traffic
!
!
policy-map type inspect dns preset_dns_map
 parameters
  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 
Cryptochecksum:a6d30480a6405852908785920018777d
: end
no asdm history enable
                                              
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by: artisitPosted on 2009-08-13 at 20:04:58ID: 25094981

also, i had (prior to the original post) run the crypto command to enable ssh

 

by: kenboonejrPosted on 2009-08-13 at 20:05:50ID: 25094985

Ok you static is good but your ACL is not right.

You have:
access-list outside_access_in extended permit icmp any any
access-list outside_access_in remark smtp for small business server
access-list outside_access_in extended permit tcp any host 192.168.1.3 eq smtp
access-list outside_access_in remark http for small business server
access-list outside_access_in extended permit tcp any host 192.168.1.3 eq www
access-list outside_access_in remark https for small business server
access-list outside_access_in extended permit tcp any host 192.168.1.3 eq https


You need to change the 192.168.1.3 to aaa.bbb.ccc.35 in that access-list.

So make sure you re-apply the acl once you fix it.

 

by: artisitPosted on 2009-08-13 at 20:11:09ID: 25095003

Sweet!!!  Ok, so that fixed my NAT issue to .35.  Thanks kenboonejr.

Any ideas on why I cannot access the ASDM from the outside via .34?  I'd like to be able to access the ASA remotely to be able to manage.

 

by: kenboonejrPosted on 2009-08-13 at 20:14:59ID: 25095012

So I am assuming you are making changes to the ASA either through a telnet or ssh session on the inside interface or you are consoled in.  How are you testing the asdm and ssh from the outside?  IF you are on the inside and are trying to access the outside interface for ssh or asdm thats not gonna work, you would actually have to be on the outside.  Is that how you are testing this.  You config looks good, assuming your myip2 is correct on the ssh entry.

 

by: artisitPosted on 2009-08-13 at 20:20:33ID: 25095034

I have RDP session to a machine on the inside.  I am access the ASA via serial cable after creating RDP session.  RDP is to 192.168.1.3.  From this machine, I can also access the ASA via ASDM.  I also just added SSH and verified that I can access from internally.

 

by: kenboonejrPosted on 2009-08-13 at 20:23:18ID: 25095048

So your RDP session - is it over a VPN to another device?

 

by: artisitPosted on 2009-08-13 at 20:25:16ID: 25095055

It's actually through Kaseya.  There is an software agent installed on the server at 192.168.1.3.  I have created a remote desktop connection through the agent on the server behind the firewall.  I am effectively working on the console of the machine on the LAN.  The wire protocol is some sort of tunnel through the Kaseya agent.

 

by: artisitPosted on 2009-08-13 at 20:26:41ID: 25095060

I realized, I didn't answer your question.  So...from the inside, I can connect via 192.168.1.1.  From the outside, I am trying to access the public IP address of Vlan2 / outside.

 

by: kenboonejrPosted on 2009-08-13 at 20:38:58ID: 25095100

Ok I was just trying to make sure that the traffic from your box was not going in some round about way to get there.  The config looks good.  I don't see anything wrong with it unless you address is not what you think it is.  Go to www.whatismyip.com and verify that the address you think you have is what is being reflected on the internet.  However you did have a an all 0.0.0.0.0 for http so not sure why that is not working.  Do you get anything on your browser when you attempt to connect?  I have to shutdown here tonight but what I would do is once you are sure of your public ip address. keep issuing this command over and over while you try to connect:

sho log | include x.x.x.x

x.x.x.x = your public ip address.

The log keeps overwriting itself so you have to keep entering the command over and over.  It will show you all entries that have your address in it.  I would start there and see if the logs tell you anything.  
Good luck.

 

by: artisitPosted on 2009-08-14 at 08:52:48ID: 31615637

Thanks Ken!

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