Cisco Firewall :: ASA 5505 - NAT Rules Set Up For Simple Port Forwarding
Jan 15, 2013
Here is my environment: DSL Modem - ASA 5505 - switch ,Inside network (192.168.2.0/24)
What I have successfully done:
- Modem online and passing on DHCP requests from the ASA to my ISP (ASA does get an internet address on the outside interface)
- ASA assigning DHCP to internal network
- All internal clients can access the internet.
What I am getting stuck on is getting NAT rules set up for simple port forwarding. What I would like: ANY internet address be able to access a server on the inside network address (192.168.2.x) over tcp/22 . I set up what I believe to be the correct NAT rule and Access Rule, but the packet tracer fails. Here is my config.
ASA Version 9.1(1)
hostname xxxxxx
domain-name ugh
enable password xxxxx encrypted
xlate per-session deny tcp any4 any4
xlate per-session deny tcp any4 any6
[code]......
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Sep 4, 2012
I've tried setting up some simple port forwarding on my ASA, where I want to forward one port on the external interface for both UDP and TCP to the same port on an internal server.
It works fine for UDP, but all TCP packets are dropped on the outside interface, even though the configuration for UDP and TCP is basically the same! This is my config:
object network MY_SERVER
host 10.10.1.4
object service TCP_MY_SERVICE
[Code].....
Port count goes up on line 2 (UDP) but never for line 1. I just see the packet denied instead. Same thing happens in the packet tracer, a packet destined for my external interface on that port for UDP is allowed and NAT'd just fine. TCP it gets dropped by the ACL on the outside interface.
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Oct 13, 2011
I have a new (about 4 months old) RV042 V3 4.0.0.07 firmware that I am trying to use in fail over mode. I have a SOHO and I normally use cable Internet connection. It is quite fast (15 megabit), but not super reliable. I have added DSL (3.3 megabit) which is five nines (supposedly) but not so quick.
I have a Westell 7500 wireless DSL modem located in the basement, where the telephone lines enter the building. This gives me a wireless link to the second floor server room through a wireless router that connects to WAN 2 of the RV042. The cable modem is in the server room and connects directly to the WAN 1 of the RV042. The cable works, but when it goes down, the DSL link comes up but does not allow Internet traffic. The RV042 is set up as a Bridge and I have set up port forwarding to get the cable to work and used similar firewall commands to route the traffic if the router switched over. I suspect that the problem is in the port forwarding (port 80) or the firewall rules(which are pretty simple) because everything looks like it switches over, but it just doesn't work on WAN2.
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Jun 20, 2011
when opening SSH service to a Database Administrator within my LAN, that has a RV016 as the default gateway. So confidence, I just set up a port forwarding in Setup > Forwarding and everything works fine, cool.
However, I do not want this to be a public access, I need a specific firewall rule for a specific external IP address (only the DBA fixed IP Internet might connect to my database server through SSH).
O noticed that when a port forwarding is created within RV016, it bypass the firewall default rules and wide-opens the service (port) to the web. Conceptually, this is correct, as port forwarding is a network translation, but I expected that my firewall had work over this.
My current solution was to create a "Deny from all" rule at port 22 and then create one additional rule that allows traffic from an specific IP at port 22.
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Oct 31, 2011
I have a system with a RV042 managing the internet connection.Behind the RV042 I have an e-mail server and a development machine that I access through SSH.My problem is that if I forward port 25 to my internal e-mail server it bypasses the firewall rules.I have an external vires and spam scan host that is the only one I should accept incoming email from - but it seems that whenever you add a portforward then it bypasses the firewall rules.
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Dec 2, 2011
So here is my network.
ASA5505--->Cisco1841--->Cat2960
Code
ASA asa831-k8.bin
Cisco 1841 c1841-adventerprisek9-mz.151-4.M2.bin
Cat 2960 c2960-lanbasek9-mz.122-55.SE1.bin
and here is my dilemma.
I can SSH from the internet to my ASA on default port 22, directly to my public IP. I can SSH from the internet to my Cisco 1841 on port 2001. I can not however, SSH to my Cat 2960. From what i can tell, on the Cat2960 i can't change the default port 22 for SSH to different port, just like i did on the Cisco 1841. I looked to see if I can change the default port for SSH on he ASA, it does not look like this is an option.
The bottom line is that i want to be able to SSH to all three devices from the internet. I only have one public IP. As of now, what i can do is only SSH to the ASA on default port 22 directly to the public IP and Cisco 1841 on port 2001. It appears that changing the default SSH port on Cat 2960 is not an option. It also appears that I can't change the default SSH port on the ASA, if i could, i would and then i should be able to SSH to the Cat 2960 on port 22. No matter what i did on the ASA, it always listens on port 22 for SSH connections.
show asp table socket
TCP 001f549f <<pub IP>>:22 0.0.0.0:* LISTEN
how do i make it listen on different port?
Here is relevent config for SSH for cisco 1841 (port forwarding)
ON ASA
object network ROUTER
host 10.10.1.1
[Code].....
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Aug 26, 2011
I just got a new rv120w and want to set it up, like my old router. I have a webserver that people around the world, should be able to visit, but I can't figure whats wrong. You can see my settings in port forwarding here.
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Feb 25, 2013
have a couple of ASA 5505's which work fine for what they are doing VPN and all that - we have 1 DLINK DFR-700 Firewall left and I need to get a new ASA to replace this since it is old.All this box really does is port forward external clients to 1 address on the internal lan for client software updates.So lets say we have client a with IP 1.1.1.1 and client b has 2.2.2.2 - at the moment this is what happens client a and b come in through http and get mapped to the internal http server 10.10.1.2So I need to setup about 100 clients which can come in through http only - get mapped to the internal IP and also keeping the internal server to be able to access anything outside.
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Dec 6, 2012
I have ASA5505 and am having issue with port forwarding NAT . [code]
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Sep 1, 2012
I have the following configuration in my ASA 5505 and I'm having problems connecting with other players on my XBox (moderate NAT).
I think my problem is that I need to forward ports tcp:3074, udp:3074, and udp:88 to my xbox which is at 192.168.2.50 (vlan 3 below).
[code]
# sh run
: Saved
:
[Code].....
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Oct 1, 2012
I am trying to forward specific ports from the outside interface on my ASA5505 to my servers inside and can not get it to work! I have a VPN that currently works and the firewall rule in place I am just overlooking something simple I'm sure. Here is the config:
ASA Version 8.2(5)
!
hostname ASA
enable password <removed>
passwd <removed>
[Code]...
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Mar 15, 2012
We are trying to setup our ASA 5505 to do port forwarding to multiple internal servers and have run into some issues. A little background on what we are trying to do.
We have 1 static external IP. Internally we have one exsisting server (10.1.1.184) that has port 80 forwarded to it and another exsisting server (10.1.1.185) that has port 443 forwarded to it. Both of these servers are serving seperate web apps to our employees who of course use them offsite. We have now added an additional server (10.1.1.186) that needs to use both ports 80 and 443. Is there any way to set it up so that these ports can be forwarded to all the servers that need them? Also, how would this work as far knowing what traffic will need to go to which server even though it is using the same port?
The equipment is: ASA 5505ASA Version 7.2(4)ASDM Version 5.2(4) I appologize in advance if what I'm trying to do is difficult/impossible. I inherted the ASA 5505 at this location and I was not here when it was initially installed. In fact no one on staff was here when it was initially installed. I did manage to find the passwords to it though. I'm not at all familiar with the ASA 5505 or Cisco secuirty appliances in general.
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May 20, 2012
I have ASA 5505 with 8.4(2)8 software for one of my branch offices and I can't configure port forwarding.It seems to be very simple, but it's not working. I use my ASA as a gateway to the internet for users in office and for site-to-site IPSec VPN to HQ. I have pppoe-enabled outside interface, but ISP gives me static routable ip address. I have server behind my firewall and I should "publish" to the WAN some of its' tcp and udp ports, but I see that no packets forwarded through ASA. I tried to configure PAT as stated in official "Cisco Security Appliance Configuration Guide" through CLI and ASDM.[code]
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Dec 27, 2011
I have Cisco ASA 5505 Firewall with security plus license, Currently I open ports on 25,80,443 on public IP address 1.1.1.1 and perform static nat between the inside and outside IP address Such as i configured via CLI
access-list OUT_IN extended permit tcp any host 1.1.1.1 eq 80
access-list OUT_IN extended permit tcp any host 1.1.1.1 eq 443
access-list OUT_IN extended permit tcp any host 1.1.1.1 eq 25
[Code]......
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May 12, 2011
how to set up port forwarding for inbound SSH?
The outside interface on the ASA is on DHCP. I have a single dynamic public IP from my ISP. The inside interface provides Internet access for the network using NAT.
I have a server on the internal network with an IP of 192.168.0.6 and I would like to access this via SSH (TCP port 22) from outside.
I've been able to do this in the past on a PIX with a static public IP block, but I'm new to ASA and I don't know how to do it with PAT.
Current running config attached for what it's worth, but it's pretty basic at the moment.
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Dec 16, 2012
Doing a port forward for remote desktop with asa 5505 9.1.1 and asdm 7.1.1 I could have done this with the previous versions of asdm but now it even more confusing?
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Jun 26, 2012
I am trying to port forwarding Exchange 2010 OWA using ASA5505, wherever I used object NAT or Twice NAT it just doesn't work.... here is my config:
access-list outside-access remark "Exchange Server Access Rules"
access-list outside-access extended permit tcp any host <public x.x.x.11> eq smtp
access-list outside-access extended permit tcp any host <public x.x.x.11> eq https
[code]...
note that i use public ip <public x.x.x.9> on the outside interface for PAT, so all hosts in the same private can access internet
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Mar 22, 2012
I have found numerous posts discussing this but have yet to find a solution. I have an RV082 with firmware 2.0.0. 2.0.0.19-tm and I need a way to limit the incoming smtp traffic to just the spam filtering company.I have a port forwarding rule to forward WAN1 port 25 traffic to 192.168.1.10.I tried to add an access rule to deny all port 25 and then added one to allow WAN1 port 25 source <spam company> destination 192.168.1.10The RV082 log screen shows the traffic allowed but it does not work. If I uncheck the 'enable' box on the DENY port 25 rule email is still blocked. Only when I uncheck the 'enable' box on the ALLOW rule does email start flowing again.
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Mar 22, 2012
I have created a simple static ip address by using this command:
interface Vlan1
nameif inside
security-level 100
[Code].....
But, no matter what, the I can't ping the static address or access the computer 10.2.1.2 from outside of the asa 5505. I have attempted to ping from inside of the asa 5505 or from another computer. I just does not work.
I also have created several rules that allows icmp traffic.
icmp unreachable rate-limit 1 burst-size 1
icmp permit any echo-reply inside
icmp permit 10.2.1.0 255.255.255.0 inside
icmp permit any echo-reply outside
icmp permit any outside
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Nov 12, 2012
I've attached a document showing how this network is designed. A client on a guest vlan behind the ASA, nat'd to one address on the public subnet, needs to be able to get out to the internet, and still come back in for specific services, such as OWA, via the IP which the mail server is nat'd to. The drawing is pretty explanatory. Do I simply need to create a NAT statement and ACL to allow that client out and back in, or do I need to set up hairpinning? I'm working with a Cisco ASA 5505 Version 8.4(4)3.
Note: The drawing has public IP's substituted with 1.1.1.x with final octet being accurate.
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Feb 5, 2012
I'm trying to configure a second server on my network but whenever I add the static NAT rule, the internet stops working on that computer.
Here's my Cisco ASA configuration:
ASA Version 7.2(3)
!
hostname domain
[Code].....
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Jun 21, 2012
In the last 8 month I have been upgrated at least 6 Cisco ASA 5505 from 8.2(1) to 8.4(3) without problems, I did a minor changes and all related to rules due a problem with the migration.
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Jan 7, 2012
Previous attempts to set up these NAT rules has been met with minimal success. We have been able to get the NAT rules created, and able to ping our inside servers and receivers from a different outside network, but every time we get that far our internal network crashes. Running the Packet Trace utility via the ASDM shows that internal traffic from the servers to the workstations is being blocked by the default implicit rule under the access rule heading that states "any to any, service being ip, action= deny". Reverse traffic from the workstations to the servers is being allowed though. In an effort to start over again, the Cisco ASA has been Factory Defaulted via the CLI, and has had it's Inside network, and Outside IP address set back up. DHCP pool has been setup for a minimal amount of addresses on the inside network, since most of our equipment will always be assigned statics. We reset our static NAT policies, and seem to be having the same problem. My partner and I have been working on this for some time now, and have ourselves so frustrated that I know we are missing something simple. [code]
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Oct 25, 2012
I'm having trouble setting up the correct rules on an ASA 5505 I'm using in my home office. I have a couple of IP Cams I need to access remotely.
I've tried setting up simple NAT(PAT) and/or Access Rules, but it hasn't worked. I have a single dynamic IP for the Outside interface. Call it 77.76.88.10 and I am using PAT. The CAM is setup to connect on port 80, but could be configured if necessary. I've tried setting up NAT Rules using ASDM as follows:
Match Criteria: Original Packet
Source Intf = outside
Dest Intf = inside
[Code]....
I'm afraid to use CLI only because I am not confident I'll know how to remove changes if I make a mistake.
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Sep 2, 2012
I have the following configuration in my ASA 5505 and I'm having problems connecting with other players on my XBox.
I think my problem is that I need to forward ports tcp:3074, udp:3074, and udp:88 to my xbox which is at 192.168.2.50 (vlan 3 below).
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Oct 30, 2012
Trying to do port forwarding so that one particular host located on the WAN can get access to a LAN box on a specific port via the public IP.
Here's what I've setup on the ASA (IP addresses and port number have been changed to protect the innocent):
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Jan 23, 2012
I would like to be able to do SSH port forwarding from outside to an IP address inside. Normally, this is very straighforward.
The problem now is that if I do so, then the LAN to LAN VPN stops working!.There is a LAN to LAN VPN working flawlesly (so far) between an ASA 5505 and a Cisco 861 Integrated Router. However, I would like also, to give SSH access to an IP address behind the Cisco router. The moment I do this the VPN breaks!
I attached the Cisco 861 router configuration, where the problem shows. The ASA has public IP X.X.X.105 and the router has X.X.X.105. These two are used for the VPN tunnel.
The internal network in the ASA is 10.115.16.0/24 and 192.168.10.0/24 in the router. These talk to each other using the tunnelt. But, the moment I try to forward port 22 in the router from X.X.X.107 to 192.168.10.30 the VPN breaks! I do that with the following line: ip nat inside source static tcp 192.168.10.30 22 X.X.X.107 22.Obviously, something is eluding me. The configuration is rather short and simple. But, I'm a newbie with Cisco rotuer configuration. Note that the tunnel stays up after I use the natting entry and I can talk from the router to the ASA, but not the other way around!The router is Cisco 861 with IOS version 15.0(1)M7.
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May 6, 2013
I am new to ASA's and have just configured my 5505 out the box with an outside (10.10.1.7) + inside (192.168.1.1) IP & NAT. The ASA has got a default route to another router (default geteway) thats connected to the internet. I have it connected this way so I can play and **** around with the ASA. My problem is when I try and ping a host on the ASA inside network (192.168.1.0/24) from the outside (10.10.1.0/24) I'm getting the following error: 5May 07 201316:38:36305013192.168.1.6Asymmetric NAT rules matched for forward and reverse flows; Connection for icmp src outside:10.10.1.22 dst inside:192.168.1.6 (type 8, code 0) denied due to NAT reverse path failure The recommendation from the syslog details is:"When not on the same interface as the host using NAT, use the mapped address instead of the actual address to connect to the host. In addition, enable the inspect command if the application embeds the IP address". Beliw is my config:
interface Ethernet0/0switchport access vlan 2!interface Ethernet0/1!interface Ethernet0/2!interface Ethernet0/3!interface Ethernet0/4!interface Ethernet0/5!interface Ethernet0/6!interface Ethernet0/7!interface Vlan1nameif insidesecurity-level 100ip address 192.168.1.1 255.255.255.0!interface Vlan2nameif outsidesecurity-level 0ip address 10.10.1.7 255.255.255.0!boot system disk0:/asa842-k8.binftp mode passiveclock timezone EST -5clock summer-time EDT recurringdns domain-lookup insidedns domain-lookup outsidedns server-group DefaultDNSname-server 10.10.1.1object network obj_anysubnet 0.0.0.0 0.0.0.0object network obj_net_Insidesubnet 192.168.1.0 255.255.255.0object network Outside_globalhost 10.10.1.6access-list outside_access_in extended permit icmp any any echo-replyaccess-list outside_access_in extended permit icmp any any source-quenchaccess-list outside_access_in extended permit icmp any any unreachableaccess-list outside_access_in extended permit icmp any any time-exceededaccess-list
[code]....
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Nov 11, 2012
Having a problem with a VPN site trying to communicate to a subnet off my ASA 5505. The network is simple, VPN IPSEC remote site is 192.168.6.0/24 and I can ping and access hosts on 192.168.10.0/24 (called InfraNet). I am now trying to allow communications between 192.168.6.0/24 (called FD_net) to 192.168.9.0/24 (called Inside) [code]
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Mar 16, 2011
We have an ASA 5505 and I need to set up port forwarding for an unusual port number which will be used for FTP on an IIS server.It's a bit complex as there are 3 VLANs: these are called ISP, Server and LAN-side VPN. We need to add a TCP port 8521 forward from the server's IP in Server WAN to ISP WAN VLAN with public IP address.
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Jun 27, 2011
We are trying to install filter software at our main location and branches. The admin console has been installed at the main branch, but I need to allow access to ports 58000-58003 through our firewall in order to successfully install the software at our branches.
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Apr 23, 2012
I've configured port forwarding on an ASA 5505 to connect to an Access Point web administration.This Is for testing purposes only. I've followed the guidelines for port forwarding and I've created an access list but I can't connect to the AP.I know It's working because It connects fine when connected to my speedtouch router.I've attached a running-config.I'm getting hit counts on the ACL and I'm getting untranslate_hits on the nat but no translate hits.
interface Vlan1
nameif inside
security-level 100
ip address 10.0.0.1 255.255.255.0
!
[code]......
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Apr 19, 2013
I have a Cisco home rack lab which is behind my ASA 5505. I use my ASA to connect to the internet. My situation is I travel a lot for work, and I am unable to do my labbing practice. I am pretty new to ASA and would like to do a port forwarding to access my access server which is connected to my Cisco routers and switches.My network topology is this: (internet)-------(ASA 5505)----------(3550)-------(CM32 Access Server)----------(Cisco Rack) This is how I setup my remote access:
Code:
ssh 0.0.0.0 0.0.0.0 outside
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