asked on

Port Forwarding on Cisco 5525-X

I'm trying to setup port forwarding on a Cisco 5525-X firewall and forward connections from the public internet to an internal server.

My goal is to forward RDP requests (port 3389) sent to 67.1.1.10 to the internal server 172.23.25.20.

Here is the version that I'm working on:

151Cisco> show version

Cisco Adaptive Security Appliance Software Version 8.6(1)2
Device Manager Version 6.6(1)

Compiled on Fri 01-Jun-12 02:16 by builders
System image file is "disk0:/asa861-2-smp-k8.bin"
Config file at boot was "startup-config"

151Cisco up 2 days 1 hour

Hardware: ASA5525, 8192 MB RAM, CPU Lynnfield 2393 MHz, 1 CPU (4 cores)
ASA: 4096 MB RAM, 1 CPU (1 core)
Internal ATA Compact Flash, 8192MB
BIOS Flash MX25L6445E @ 0xffbb0000, 8192KB

Here is the configuration of the device currently:

ASA Version 8.6(1)2
!
hostname 151Cisco
domain-name adetor-lan
enable password xxxx encrypted
passwd xxxx encrypted
names
!
interface GigabitEthernet0/0
nameif External
security-level 0
ip address 67.1.1.2 255.255.255.0
!
interface GigabitEthernet0/1
nameif Internal
security-level 100
ip address 172.23.24.2 255.255.254.0
!
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 GigabitEthernet0/4
shutdown
no nameif
no security-level
no ip address
!
interface GigabitEthernet0/5
shutdown
no nameif
no security-level
no ip address
!
interface GigabitEthernet0/6
shutdown
no nameif
no security-level
no ip address
!
interface GigabitEthernet0/7
shutdown
no nameif
no security-level
no ip address
!
interface Management0/0
nameif management
security-level 100
ip address 192.168.1.1 255.255.255.0
management-only
!
boot system disk0:/asa861-2-smp-k8.bin
ftp mode passive
dns server-group DefaultDNS
domain-name domain
same-security-traffic permit intra-interface
object service RDPTCP
service tcp source eq 3389 destination eq 3389
pager lines 24
logging asdm informational
mtu management 1500
mtu Internal 1500
mtu External 1500
no failover
icmp unreachable rate-limit 1 burst-size 1
icmp permit any Internal
icmp permit any External
asdm image disk0:/asdm-66114.bin
no asdm history enable
arp timeout 14400
!
nat (Internal,External) after-auto source dynamic any interface
route External 0.0.0.0 0.0.0.0 67.1.1.1 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
timeout tcp-proxy-reassembly 0:01:00
timeout floating-conn 0:00:00
dynamic-access-policy-record DfltAccessPolicy
user-identity default-domain LOCAL
http server enable
http 192.168.1.0 255.255.255.0 management
http 172.23.24.0 255.255.254.0 Internal
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart warmstart
telnet 172.23.24.0 255.255.254.0 Internal
telnet timeout 5
ssh 172.23.24.0 255.255.254.0 Internal
ssh timeout 5
console timeout 0
management-access Internal
dhcpd address 192.168.1.2-192.168.1.254 management
dhcpd enable management
!
threat-detection basic-threat
threat-detection statistics access-list
no threat-detection statistics tcp-intercept
webvpn
!
class-map inspection_default
match default-inspection-traffic
!
!
policy-map type inspect dns preset_dns_map
parameters
message-length maximum client auto
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
inspect ip-options
!
service-policy global_policy global
prompt hostname context
no call-home reporting anonymous
Cryptochecksum:76d3315e5a20cd3be7ae957e28ba816c

Any help is appreciated

Soulja

151Cisco(config)# static (inside,outside) tcp 67.1.1.10 3389 172.23.25.20 3389 netmask
255.255.255.255

Soulja

151Cisco(config)#access-list Internet_In extended permit tcp any host 67.1.1.10 eq 3389
151Cisco(config)# access-group Internet_In in interface outside

Adeste

ASKER

I figured it would be easy.

One more similar question regarding NAT that I'm sure will be easy as well. I have an internal server 172.23.25.15 that I need to send email using a different external IP than normal (because the reverse DNS lookup is on a different address)

How do I setup the firewall so that when 172.23.25.15 sends traffic over port 25, it will use the IP address 67.1.1.13?

SOLUTION

Michael Ortega

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SOLUTION

Michael Ortega

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ASKER CERTIFIED SOLUTION

Michael Ortega

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Michael Ortega

On future questions it would be wise to not use real identifiable IP addresses. You might use something like:

interface GigabitEthernet0/0
nameif External
security-level 0
ip address 1.1.1.2 255.255.255.0

and say that you want to NAT RDP to an internal host using 1.1.1.3 as the WAN IP, etc.

MO

Soulja

Lol, mgortega. Yeah, it's has been awhile since I have been in ASA's. Been in Junipers lately.

Michael Ortega

Soulja, "been in junipers lately"....sorry about that. =)

Been in a lot of things myself. Never going away from ASA's now.

MO

Adeste

ASKER

Thanks for all the help! I confirmed that's working!

PS: That was not my real external IP address but I appreciate the suggestion

Adeste

ASKER

Worked perfectly!

Michael Ortega

Awesome.

MO