Cisco :: Configure NAT For Inside SMTP Server In ASA 5520
Sep 20, 2012
I need to configure my ASA 5520 version 7.3 firewall to translate our SMTP server residing in local LAN to use different IP address from the outside interface which is used by all other computers to access Internet.
Under NAT section, i have NATted this internal SMTP server with different IP address(eg x.x.x.1) and also translated the remaining IP addresses in the LAN to the outside interface(eg x.x.x.2)
my problem is, Whenever i check the header for message coming from the smtp server it shows that, the SMTP server is also translated by using the same outside interface public ip address(i.e x.x.x.2) which is used by other client machine to access internet instead of the x.x.x.1.
how i can get my SMTP server to use separate IP and avoid to be blacklisted by some domain.
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Sep 21, 2012
I need to configure my ASA 5520 version 7.3 firewall to translate our SMTP server residing in local LAN to use different IP address from the outside interface which is used by all other computers to access Internet. Under NAT section, I have NATted this internal SMTP server with different IP address(eg x.x.x.1) and also translated the remaining IP addresses in the LAN to the outside interface(eg x.x.x.2)
my problem is, Whenever i check the header for message coming from the smtp server it shows that, the SMTP server is also translated by using the same outside interface public ip address(i.e x.x.x.2) which is used by other client machine to access internet instead of the x.x.x.1. How I can get my SMTP server to use separate IP and avoid to be blacklisted by some domain.
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Oct 25, 2011
Using an ASA5505, have 1 static outside address, want to access an inside SBS-Server on SMTP, RDP (3389), HTTPS and port 987
Have configured network object nat rules using the asdm, SMTP works (I can telnet to the server on port 25 from outside), however for some reason I can not telnet inside and out on port 25, so outgoing mail does not work. RDP does not seem to work from outside, 987 I havent tested from outside. When I try to create a network object nat rule for https I get this message from the ASA:
[OK] object network SBS-HTTPS
object network SBS-HTTPS
[ERROR] nat (inside,outside) static interface service tcp https https
NAT unable to reserve ports.
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Nov 24, 2012
We already have a subnet defined to inside interface and is in produciton. the default gateway is this interface ip. In that setup now I have to add one more subnet and as the first subnet is been defined in ASA indside interface, I have to assign secondary Ip to the inside interface so that new subnet users can easily reach here and go outside.
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Oct 16, 2011
I have a asa 5520 with an outside and backup interface. I am trying to configure two static nat statements from the inside to the outside and backup interface. Here is what I have configured so far.
object network obj-10.1.1.254
host 10.1.1.254
object network obj-10.1.1.254
nat (inside,outside) static 172.25.10.3
I want to also use nat (inside,backup) static 172.25.10.3
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Jul 7, 2012
How to configure traffic flow between computers inside VLANs and a routed port? Here is the setup details:
1. Switch 3750-X
2. VLAN 100 - ( SVI IP address 192.168.100.1 /24)
3. VLAN 200 - ( SVI IP address 192.168.200.1 /24)
4. routed port gi1/0/48 (IP address 192.168.150.1 /24). Note: this port is directly connected to a firewall ASA 5520 port IP 192.168.150.100 /24
Ip routing is enabled on the switch and inter vlan traffic is flowing ok. I can ping the routed port gi1/0/48 from any computer connected in the VLAN 100 or 200. For example computer with IP 192.168.100.25 can ping the routed port 192.168.150.1. Switch can ping firewall port 192.168.150.100 and the 'sh ip route' command shows the network 192.168.150.0 /24 as directly connected network.
any computer in the two VLANs CANNOT ping firewall ASA port 192.168.150.100 Is it because inter VLAN routing does not work with a routed port on L3 switch? I looked up fallback bridging, but it is meant for non IP traffic.The goal is I am trying to set the ASA port as an internet gateway for VLANs.
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Mar 21, 2012
I am desperate to make some kind of translation which convert an outside IP Address of our web server to its inside ip address so that requests can be routed internally to the server.
This is what we have: A wireless network with an SSID to serve visitors. We also have an in-house web server which can be accessed internally and externally. We have a ASA 5520 that protects the internal network, including the Web server, and also routes all traffic from the all visitors connected to the public SSID to the outside. The DHCP server for the wireless network for visitors is configured to give the 8.8.8.8 as dns server. The problem with that is that the www.ourwebserver.com is resolved by Google's dns server to the public IP Address of our web server! The traffic then is sent to the outside interface of the ASA 5520. The visitor who wants to access our web server cannot connect!
How can I configure the ASA to route that traffic to our web server with the public ip address to the inside ip address of the web server?
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Mar 3, 2013
I have a 5520 in production at a customer's site between an outside 802.11 network and an inside server. The server can get to outside hosts OK, and the traffic is being NATed properly, and sockets initiated by the server on the inside can pass data both ways, but I need to allow outside hosts the ability to send 'announcement' UDP packets to the inside server. I thought this might be an outside-NAT-required issue to get the traffic routed, but I need the inside server to see the actual outside host source IP in the UDP packet, so I basically set the outside host up similar to the inside host, just without the NAT table on the firewall -- it's subnet is outside the destination (inside server) subnet, and its gateway is the outside interface of the ASA, the same way the inside server is able to get to hosts outside. The firewall should just route the packet with a destination of the inside subnet once it sees that it hits a 'permit' ACL.
I have the appropriate ACL's set up, and when I do 'show access-list' I see policy hits for the 'permit' statements where the outside host is generating the announcement and it's hitting the ACL. I even duplicated the ACL into list 101 and 102, and applied 101 for inbound traffic on the outside int, and applied 102 for outbound traffic on the inside int, and I'm seeing policy hits on both permit statements outside and inside, so it looks like the traffic is being passed on to the inside interface and permitted, but the server isn't seeing the packets.
I can ping the outside interface from the outside, but cannot ping the inside interface or any inside hosts from the outside, even though I have 'permit icmp any any' enabled on the ACL on both ints. When I remove the firewall and put the outside clients on the same subnet, the server sees the packets just fine.
I set up the same scenario in my lab with an ASA 5505, with the same results. Below is the running config from the 5505 in the lab. The production firewall is running a slightly older version of ASA, so I made the configuration as basic as possible on the 5505 to match the config in the field:
: Saved
:
ASA Version 8.3(1)
!
hostname ciscoasa
enable password Guh9Xxhb9mcC8lV1 encrypted
passwd 2KFQnbNIdI.2KYOU encrypted
names
!
interface Vlan2
description Outside WAN Interface
nameif outside
security-level 0
ip address 192.168.10.1 255.255.255.0
!
interface Vlan3
description Inside LAN Interface
nameif inside(code)
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May 9, 2012
We've just started with the ASA 5505. We do run a DHCP server on the inside interface, so it is in the same VLAN 1 as all of the clients. However, we cannot get it to work.We can't use DHCP Relay, as the ASA 5505 only allows to relay to DHCP servers in a different subnet.Or do we have to move the DHCP server to a different subnet. If so, how would we configure that scenario?
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Dec 25, 2012
Most examples of NAT translation using an ASA 8.4 are based on servers within a DMZ. In my case it's not because the mailserver also functions as an data and Active Directory server for my local domain. If tried to config the ASA for a while now and throw it in the corner for a couple of months out of frustration. Now I got some time left during christmas break I decided to start again.My purpose is to NAT SMTP / POP traffic from the internet, trough the ASA to my (inside) server. This is what I got so far. With this config I'm unable to telnet the inside server (192.168.1.10) from a remote location.
ASA Version 8.4(3)!hostname ciscoasaenable password cE8UUNd encryptedpasswd 2KFQ.2KYOU encryptednames!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 192.168.1.253 255.255.255.0!interface Vlan2nameif outsidesecurity-level 0ip address 95.*.*.218 255.255.255.248!ftp mode passiveobject network obj_anysubnet 0.0.0.0 0.0.0.0object network server1_smtphost 192.168.1.10object network server1_pop3host 192.168.1.10access-list outside_access_in extended
[code]....
I can ping 192.168.1.10 from the ASA CLI. I can Ping DNS 4.2.2.2 from the CLI (internet access). I can Telnet the server from the inside LAN, using: telnet 192.168.1.10 25.But I can't Telnet from an outside location using: Telnet 95.*.*.218 25 Because my server is on the Inside interface (diffenrent subnet) do I need an additional route?
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Mar 12, 2012
Cisco works LMS 4 is very complicated tool for me and it is very hard to configure any cisco device what I need to monitor.Currently I have 3750-X configured, properly discovered and added to DCR. I would like to receive SMTP messages(mail) from LMS if some event occurs. For example when link UPDOWN occurs or when LOGIN_FAILED occurs and so on. I tried to configure it in Monitor > Monitoring Tools > Fault Monito, but without siccess. LMS tell me that there are no devices available.How can I configure some notification so it is able to send me message via smtp?
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Jan 20, 2012
I just installed LMS 4.0 on OS Window 2008 R2. Right now, I know how to add devices in DCR and set SMTP server. My question is
1. I want LMS to send an alert email when Coreswitch is down how to do that ?
2. I want LMS to send an alert email when interface is down (not all interface but specify one) how to do that ?
3. I want to created a custom portlet that monitor only one device and specify interface on it how to do that ?
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Nov 13, 2011
Running lms 3.2.1 CS 3.3.1 on Windows 2003
I need to point the LMS server to a new mail relay, but when I make the change in
CS->SERVER->Admin->System Preferences smtp server
It claims to have made the change successfully but the old IP address remains.
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Aug 23, 2012
I'm trying to change the IP address of the smtp server on cisco LMS 3.2.1;I have changed the IP on the GUi and when it didn't work, in the regdaemon. xml file, but it did not work too;When I capture packets from the LMS, it still sends emails to the old IP;
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Jun 11, 2012
We have configured ASA 5510. We have configure Ethernet 0/0 ( Outside ) connected with ADSL line and Ethernet 0/1 ( Inside ) Local LAN. we have configured NAT and all the traffic is passing through outside interface. Now we have connected ethernet 0/3 ( leasedline ) interface with static public IP. Now we want to allow SMTP traffic to pass through from this interface.
How to configure it if we want our local lan SMTP traffic sending through new leased line ( Static Public IP ).
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Jan 10, 2011
I am deploying a Cisco 1841 in place of our basic DSL router.I have an ADSL WIC and FA0/0 connected to our LAN.LAN IP ADDRESS range is 192.168.1. 0/ 24 I have dynamic and static NAT configured. At this point although I have ACL's configured I have NOT implemented them as yet for the following reason. I am unable to recieve inbound SMTP traffic - now know my MX records are correct as this all owrks happily on our basic DSL router. I can send external emails no problem and all internal email works fine. [code] I am in the process of defaulting the router and programming the barbones to get the link working and see if inbound SMTP works then start building the blocks again.
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Oct 11, 2011
I've got some problem with my Mail Server since I've migrated to an ASA5510.Actually the server is in a DMZ with a private Ip ( 10.x.x.2) and it is translated to a Public IP ( 194.x.x.65).I use these configuration :
static (DMZ,LAN) 194.x.x.65 10.x.x.2 netmask 255.255.255.255 static (DMZ,LAN) 194.x.x.66 10.x.x.3 netmask 255.255.255.255 static (DMZ,WAN) 194.x.x.65 10.x.x.2 netmask 255.255.255.255 static (DMZ,WAN) 194.x.x.66 10.x.x.3 netmask 255.255.255.255 static (LAN,DMZ) 192.168.0.0 192.168.0.0 netmask 255.255.248.0
Some Users received in there mailbox a system administer error message :
Object : Impossible to deliver : test Your message could not be deliver to one or more of its recipients: 421 SMTP connection went away!
When they try to re sent it some times later, message is sent without problem.
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Jun 8, 2011
I can send email though my yahoo account (which is hard wired to my router) and I can access the internet through my wireless device (iPhone 3GS) but I can not send email through my wirless device. I keep getting a message stating it can't reach the smtp server.
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Jul 30, 2012
I have an ASA 5510, one public IP address on my outside interface, an internal email server and a private network.I would like...
1: Users on my private network to be able to access the internet (PAT them to external outside address)
2: Email to be delivered to my MX (my single public IP address translated back to my internal email server.
i.e. can I share my single public IP address to serve translation in both directions (private users surfing the Internet (in-to-out) and an outside to inside NAT for email) ?
Email (MX) = 1.2.3.4
Public (outside) address = 1.2.3.4
Email server internal = 10.1.2.3
Internal private subnet for users = 10.0.0.0/8
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Mar 23, 2013
I have an E1500 N300 Router, I've had it for 3 or 4 weeks now. Ever since I've had it, I can no longer send e-mails out with Eudora nor Outlook. I've tried using about 3 different SMTP's just to verify that it wasn't a server issue. I tried Port Forwarding in the router settings. I selected SMTP and POP3 and checked Enable on both, then save changes. But they don't appear to be taking, as when I go back in and try to set them again, it let's me and doesn't give me a Port Overlap warning. I've been told that I shouldn't need to mess with Port Forwarding at all, I just need to go into the Firewall settings and open up the SMTP, POP3, and IMAP ports. However, I don't see any settings in my Router settings to allow this, aside from Port Forwarding and it's not actually saving the changes. I will admit, I'm not all that great with this stuff, and this is the first time I've had any issues with a Router stopping me from E-mailing.
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Oct 3, 2012
I have an ASA 5520 Cisco Adaptive Security Appliance Software Version 8.4(2)8 Device Manager Version 6.4(5)206. I am trying to add a nat for outside x.x.x.77 port going inside x.x.x.22 port 80 . the wan interface is .74 with subnet of 255.255.255.248 the rule will add but traffic wont pass in.
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Mar 13, 2012
I have a cisco asa 5520 ios 8.2. This is my configuration [code] But i can not access from DMZ to INSIDE.
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Oct 23, 2011
I guess I'll start with the easy stuff, Cisco ASA 5520 ver 8.2, ASDM ver 6.2, IPSec L2L tunnel with overlapping private IPs.
I have about a dozen L2L connections on our 5520 but never had to do one with overlapping IPs. I have two that I have to build and one definitely overlaps our inside locals, and the other is requesting that we NAT our inside locals to a 10.x.x.x.
I've searched the board and found several good posts including document 112049, but I just don't seem to be able to get my head around how to translate one inside address to another. It would seem like is would be as easy as doing an (inside,inside) static NAT, but most everything has the solution as a policy NAT or doing an (inside, outside) but in the less secure address space place the name of an ACL. I have ordered that brick of a book on ASAs from Cisco Press, but need to get something going and I'm not having much luck getting this thing up and running.
Perhaps my basic understanding of NAT rules is wrong. I thought that when using NAT the command speaks to the interfaces and the direction of travel, (inside,outside). I also thought that the IP adresses used must be valid on the interface refferenced, so any refference to "inside" would have to be an address on the "inside interface of the FW and likewise for the "outside" interface. Finally, to be sure I'm not calling a duck a goose my understanding is that the following are correct; "inside local" = my private, "inside global= my peer, "outside local"= their private, "outside global"= their peer.
So if I'm translating say a 192.x.x.x on my inside local and wanted to present them a 10.x.x.x, wouldn't I need an (inside,outside)? And even though I'm translating my private IP into a different private IP, the translated IP must be on the "outside" interface because that is the interface that I want to present the new private IP on?
So for the scenario I suggested at the top where I need to translate my private 192.x.x.x into a 10.x.x.x and present that 10.x.x.x to the other side, I need something like NAT Static (inside,outside) 10.x.x.x 192.x.x.x?
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Aug 18, 2011
We currently have a setup where users connect to the inside of a firewall using the ipsec client. We are moving them to the anyconnect client but are unable to get it to work, we cannot even get a webvpn page on the inside.
When trying to connect with anyconnect the ASA reports an IKE initiator fail on the inside. and no tcp connection flag. We cannot get any response with Webvpn either I have tried using a different tcp port on webvpn but then the asa denies the traffic even though there are no rules denying.
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Mar 2, 2011
I am setting up a pair of 5520 in A/S mode but the traffic from inside to outside seems blocked somehow.
asa01# sh run : Saved
ASA Version 8.3(1)
host name asa01
enable password LFJ8dTG1HExu/pWQ encrypted
password 2KFQnbNIdI.2KYOU encrypted
names
[code]......
Base on the above configuration, I still cannot ping or HTTP.
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Jan 27, 2013
I am trying to configure a server(192.168.5.50) in DMZ(192.168.5.0/24) to be able to communicate with a domain controller(10.5.44.220) in the inside network(10.5.44.0/24). I made some configuration using ASDM(not familiar with the CLI) but not working and it caused existing NAT not to work, for example RDP(TCP 3389) connection to 38.96.179.220
The things I am trying to achieve are
1. two way commucation between 192.168.5.50 in DMZ and 10.5.44.220 in Inside for SecureAuthPorts and SecureAuthOutbound service groups
2. NAT for 192.168.5.50 mapping 38.96.179.50 for the service groups mentioned above
3. NAT for other hosts already existing
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Nov 27, 2011
I am trying to make a basic config on my 5520. The first goal is to make trafic from inside to outside.The internet address is 64.28.29.200 and the default internet gw is 64.28.20.193What am I missing since I can not get trafic from inside to the internet? [code]
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Sep 25, 2011
I currently have a Cisco 5520 ASA which is up and running and the users are able to connect to Anyconnect to VPN into the network. However, users plugged into the internal network inside the ASA are unable to connect to the vpn address and download the Anyconnect Client. I think this may be to do with reverse NAT missing?
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May 13, 2013
I have ASA 5520. I cannot ping the host(192.168.1.20) which is inside firewall from outside hosts. Inside host (192.168.1.20) is translated into (198.24.210.226) using static NAT.From outside host, I used "PING 198.24.210.226". Is it because I used dynamic PAT for inside hosts?
interface GigabitEthernet0/0nameif outsidesecurity-level 0ip address 198.24.210.230 255.255.255.248!interface GigabitEthernet0/1nameif insidesecurity-level 100ip address 192.168.1.1 255.255.255.0
[Code].....
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Mar 7, 2012
I'm trying to NAT SIP registration from OUTSIDE interface to Inside interface on ASA
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Sep 23, 2012
I am new in ASA, I have the DMZ (10.1.1.0/24) configured on ASA 5520 and I achieve the reach Internet from DMZ (10.1.1.0/24), but now need reach DMZ from inside (172.16.12.0/24) and inside (172.16.12.0/24) from DMZ (10.1.1.0/24), in other words round trip.
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Mar 29, 2011
I have inherited an ASA 5520. In doing some auditing of the setup, I have noticed a Static Route that has the inside interface of the ASA as the Gateway IP. I am trying to understand the purpose of this route or why a route would be setup this way.
Example Static Route:
Inside 10.xx.31.0 255.255.255.0 10.xx.xx.10 (10.xx.xx.10 is the inside interface of ASA)
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Apr 6, 2011
I have a handheld device that will be used for inventory outside of our office. It has 3g capabilities. Is there anyway I can permit traffic from this device from the outside world coming into my network? I need to open a couple of ports so it can hit the server. But I have no intention to open these ports up to the entire world. I use an ASA 5520 with a managed router from our provider. I looked around on the Cisco site and the only information I found was for permitting and denying traffic from devices that are within the network.
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