09-09-2008 11:19 AM
My company uses a Cisco ASA 5505 Adaptive Security Appliance, and I am trying to set up a SFTP server that can be accessed from the Internet.
Is there any way to simply set up port forwarding for my FTP port (4610) to the ip address with the server, as I would do on a simple Linksys router? Or do I need to set up some sort of DMZ?
Any help would be greatly appreciated.
Solved! Go to Solution.
09-09-2008 11:26 AM
No you don't necessarily need a dmz, inside will work fine. I assume you will want to use the ip of the outside interface of the ASA for this? If so, it would looks something like this. Where x.x.x.x is the inside/private ip of the ftp server.
static (inside,outside) tcp interface 4610 x.x.x.x 4610 netmask 255.255.255.255
access-list outside_access_in extended permit tcp any interface outside eq 4610
access-group outside_access_in in interface outside
09-10-2008 09:51 AM
Can you use the 192.168.1.106 ip address from inside?
If you definitely want to use the outside address from the inside you need something called hairpinning.
same-security-traffic permit intra-interface
global (inside) 1 interface
nat (inside) 1 0 0
static (inside,inside)
09-09-2008 11:26 AM
No you don't necessarily need a dmz, inside will work fine. I assume you will want to use the ip of the outside interface of the ASA for this? If so, it would looks something like this. Where x.x.x.x is the inside/private ip of the ftp server.
static (inside,outside) tcp interface 4610 x.x.x.x 4610 netmask 255.255.255.255
access-list outside_access_in extended permit tcp any interface outside eq 4610
access-group outside_access_in in interface outside
09-09-2008 11:33 AM
Thanks a lot! So do I just type that in the command-line interface?
I'm using the ASDM GUI in Windows, and I know I can access the command line by going Tools->Command Line Interface.
09-09-2008 11:48 AM
The command line utility in the ASDM is not what I would recommend. If you wanted cli I would use telnet or ssh.
I tried to find you an example using the ASDM here....but couldn't find one.
http://cisco.com/en/US/products/ps6120/prod_configuration_examples_list.html
09-09-2008 11:57 AM
I'm a beginner with the 5505, so I'm just not sure how I'm supposed to enter that information. What's the easiest way? Can I do it using the GUI, by going to the configuration tab?
Thanks!
09-09-2008 01:04 PM
Ok, I set up those rules, but it still doesn't work. The ASDM (after refreshing) shows a new security policy access rule and a new static NAT rule. Am I missing something?
And yes, what I want is for someone on the Internet to type in the cable modem's ip address (the outside address), and to have that sent through to the computer with the FTP server running.
It's frustrating, because doing this is so simple in a basic router, it's just a quick port forward. I have no experience in a device like the ASA 5505, so I'm learning as I go, but they don't make it easy. All of the documentation and examples seem to be made for people who already know what they're doing.
09-09-2008 02:54 PM
Go to File -> Show running config in new window
Copy the config out and paste it here.
09-10-2008 05:12 AM
Here it is:
: Saved
:
ASA Version 7.2(3)
!
hostname ciscoasa
domain-name default.domain.invalid
enable password xx
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 dhcp setroute
!
interface Vlan3
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
!
passwd xxx
ftp mode passive
dns server-group DefaultDNS
domain-name default.domain.invalid
same-security-traffic permit inter-interface
same-security-traffic permit intra-interface
object-group service SFTP tcp
description our SFTP server
port-object range 4600 4620
access-list outside_access_in extended permit tcp any interface outside eq 4610
pager lines 24
logging enable
logging asdm-buffer-size 512
logging buffered warnings
logging asdm warnings
logging flash-maximum-allocation 100000
logging ftp-bufferwrap
logging ftp-server 192.168.1.106 / user ****
mtu inside 1500
mtu outside 1500
mtu dmz 1500
icmp unreachable rate-limit 1 burst-size 1
asdm image disk0:/asdm-523.bin
asdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 1 0.0.0.0 0.0.0.0
static (inside,outside) tcp interface 4610 192.168.1.106 4610 netmask 255.255.255.255
access-group outside_access_in in interface outside
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 uauth 0:05:00 absolute
http server enable
http 192.168.1.0 255.255.255.0 inside
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart
telnet timeout 5
ssh 192.168.1.106 255.255.255.255 inside
ssh timeout 5
console timeout 0
dhcpd auto_config outside
!
dhcpd address 192.168.1.10-192.168.1.33 inside
dhcpd enable inside
!
!
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:xxx
: end
asdm image disk0:/asdm-523.bin
asdm history enable
09-10-2008 06:51 AM
Config looks ok. Is the ftp server listening on 4610?
09-10-2008 07:15 AM
Yeah. And when I try to connect by putting in the local ip address (192.168.etc), it connects fine. But when I put in the external ip address, it just times out.
09-10-2008 07:37 AM
When you say "But when I put in the external ip address, it just times out.", are you doing this from the inside, outside or both?
09-10-2008 09:09 AM
Inside. Could that be causing the problem? Before I got the ASA 5505, I could do that no problem.
09-10-2008 09:23 AM
Yes, unfortunately that is the problem. But there is a way to do it. Are you using an ip address, hostname, or both when you connect?
09-10-2008 09:28 AM
ip address.
09-10-2008 09:51 AM
Can you use the 192.168.1.106 ip address from inside?
If you definitely want to use the outside address from the inside you need something called hairpinning.
same-security-traffic permit intra-interface
global (inside) 1 interface
nat (inside) 1 0 0
static (inside,inside)
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