Cisco Firewall :: Dynamic NAT On ASA 8.2
Feb 16, 2012
I can't figure out why the ASA cannot send traffic to the internet with the below config. What did I do wrong?
interface Ethernet0/0
nameif Outside
security-level 0
ip address 4.28.x.x 255.255.255.252
!
interface Ethernet0/3
[Code]...
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Feb 7, 2012
I can't figure out why the ASA cannot send traffic to the internet with the below config. What did I do wrong?
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Feb 24, 2013
its possible to have same dynamic translation within 2 different networks like:
interface gig 0/1
1.1.1.1 255.255.255.0 (LAN Connection w/ DHCP enabled)
inteface gig 0/2
2.2.2.1 255.255.255.0 (Wireless Connection w/ DHCP enabled)
Actually, the scenario was 1.1.1.1 is my LAN connection and 2.2.2.1 are my Wireless connection.
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Oct 5, 2011
I need to create a vpn tunnel between my Cisco 837 having a dynamic IP and my Firewall (Static IP).
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Apr 11, 2011
I have devices on Inside interface of ASA that need to get to Internet to get ntp. Hence I want to set up dynamic pat (interface overload) which 8.3 style would be
-object network obj_NTP-DEV
-host 192.168.1.250
-nat (INSIDE,INTERNET) dynamic interface
But I need to limit nat to only Internet destined traffic on ntp port not all ports for traffic from 192.168.1.250.I'm not using this nat set up to control outbound access - I also have incoming RA VPN tunnels to the box and traffic from these sources need to be able to get to 192.168.1.250 and the above simple set up would break that access as all traffic involving 192.168.1.250 would get nat'd
Reading the doco I've sent myself round in a loops trying to figure how you are meant to do such a " Dynamic Policy NAT (overload)" call it what you will config in 8.3
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Feb 19, 2012
have 2 inside networks:
object network INSIDE_10.6
subnet 10.6.0.0 255.255.0.0
object network INSIDE_192.168
subnet 192.168.0.0 255.255.255.0
I grouped these 2 into 1 object-group:
object-group network INSIDE
network-object object INSIDE_10.6
network-object object INSIDE_192.168
Public IP address used for PAT:
object network PAT
host 152.x.x.x
I used the following statement to create Dynamic PAT to public IP address:
object network INSIDE_10.6
nat (any,any) dynamic PAT
object network INSIDE_192.168
nat (any,any) dynamic PAT
Is that correct? Also I'm using one public address to PAT both inside networks. Is there any dvantage of using 2 different ones, so each inside network would be PAT to its own address?
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Mar 23, 2013
Recently we migrated our network to ASA 5515, since we had configured nat pool overload on our existing router the users are able to translated their ip's outside. Right now my issue was when I use the existing NAT configured to our router into firewall, it seems that the translation was not successful actually I used Dynamic NAT. When I use the Dynamic PAT(Hide) all users are able to translated to the said public IP's. I know that PAT is Port address translation but when I use static nat for specific server. The Static NAT was not able to translated. Any conflict whit PAT to Static NAT?
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Nov 8, 2011
in ASA 8.4, I need to use to static nat an internal IP with a public IP and use the same public IP to dynamic nat another internal IP:
-nat (inside,outside) source static IP1_PRIVATE IP_PUBLIC
-nat (inside,outside) source dynamic IP2_PRIVATE IP_PUBLIC
All outgoing connection from IP1_PRIVATE and IP2_PRIVATE should be natted to IP_PUBLIC and all incoming connection to IP_PUBLIC should be forwarded to IP1_PRIVATE: is it correct ?
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Jun 3, 2012
I have a site with an ASA5505 and 2 isp connections but the catch is the 2 isp's are giving me a dynamic IP so I am unable to use this [URL]
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Jan 10, 2012
Does ASA 5540 support BGP routing protocol to be configured on it??
I'm talking about the latest versions.
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Oct 5, 2011
we are running 8.4(2) on the asa with the below configuration we basically have a static for .7 on .25 and a nat for .7 for port direction with manual nat that takes precedense over auto nat within the object group am I correct that I dontneed the dynamic statement and that its redundant?
-object network obj-10.X.0.25-02host 10.X.0.25
-object network obj-10.X.0.25nat (any,INSIDE) static X.X.X.7 dns
-object network obj-10.X.0.25-01nat (INSIDE,OUTSIDE) static X.X.X.7 service tcp smtp smtp
-object network obj-10.X.0.25-02nat (INSIDE,OUTSIDE) dynamic X.X.X.7
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Jan 13, 2013
To configure a dynamic NAT, PAT, or identity NAT rule, I need to perform the following steps:
Step 1 From the Configuration > Firewall > NAT Rules pane, choose Add > Add Dynamic NAT Rule.
The Add Dynamic NAT Rule dialog box appears. However, when I click on Add I don't get the option to Add Dynamic Nat Rule. To see the options I get please see attachment.
The following is a capture of the show version:
ciscoasa# show ver Cisco Adaptive Security Appliance Software Version 8.4(2) <system> Device Manager Version 6.4(1) Compiled on Wed 15-Jun-11 18:17 by builders System image file is "Unknown, monitor mode tftp booted image" Config file at boot was "start up-config"
ciscoasa up 16 mins 57 secs Hardware: ASA 5520, 1024 MB RAM, CPU Pentium II 1000 MHz Internal ATA Compact Flash, 256MB
BIOS Flash unknown @ 0x0, 0KB
0: Ext: GigabitEthernet0 : address is 00ab.a72f.0100, irq 0
1: Ext: GigabitEthernet1 : address is 00ab.a72f.0101, irq 0
2: Ext: GigabitEthernet2 : address is 0000.ab6d.9802, irq 0
[code]...
This platform has an ASA 5520 VPN Plus license. Serial Number: 123456789AB
Running Permanent Activation Key: 0x4a3ec071 0x0d86fbf6 0x7cb1bc48 0x8b48b8b0 0xf317c0b5
Configuration register is 0x0
Configuration has not been modified since last system restart.
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Jun 1, 2011
I have ASA 5510 and public FTP server from my local network to external IP address, with static nat translation. All works, but I need request to ftp come from internal ASA interface (need use gateway different ASA). How configured ASA for forwarding request?
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Feb 18, 2013
How to get DynDNS or some other public dynamic DNS services on the Internet working on ASA 5505?
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Mar 11, 2013
This is a working example using static. But it doesn't work with the dynamic interface or I'm doing something wrong. Need to get rdp access to my laptop.
ASA Version 8.4(5)6
!
hostname ciscoasa
enable password 8Ry2YjIyt7RRXU24 encrypted
passwd 2KFQnbNIdI.2KYOU encrypted
names
[code]...
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Dec 10, 2011
I have a ASA5510 with 2 internal interfaces (inside1 and inside2 same security level) configured with OSPF for dynamic routing with 2 routers to corporate subnets. I have a server in a private subnet that needs to be accessed from Internet. So static pat is used in ASA with the command
static (inside1, outside) tcp interface www 192.168.1.1 www netmask 255.255.255.255
As OSPF is in use, the subnet 192.168.1.0/24 may be reachable from interface inside2. When I tried to configure the static command for inside2,
static (inside2, outside) tcp interface www 192.168.1.1 www netmask 255.255.255.255.the error message came out "WARNING: mapped-address conflict with existing static...". Is this just a warning, or this is not possible in ASA.
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May 29, 2013
I've been tracking a conversation on my firewall. I have an inside device that is trying to communicate to a server outside to send data. The conversation is suppose to be all 443. I see that there is a TCP connection made and a dynamic NAT that translates my inside device to the public IP, and appears to change the port to 65415. The problem I'm having is that the conversation ends with reset-O, and I'm wondering if that port has something to do with it, or if it's just that their server is resetting the connection because of an issue they are having? The vendor says no firewall rules are needed for this device to communicate with their server.
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Jun 4, 2013
we have a nat exemption rule for 10.0.0.0/8 to w.x.y.z followed by some static nat rules and then dynamic policy nat rule for 10.0.0.0/8 to w.x.y.z natting to IP a.b.c.d.When I do a packet trace from 10.10.10.10 to w.x.y.z, it shows the packet first matching against the nat exemption rule, and then immediately afterwards it matches the dynamic policy NAT rule. The static nat rules are being successfully bypassed (which is what I want), but why does the dynamic policy nat rule apply if an exempt rule has been hit already? An actual test between the IPs above reflects the result of the packet tracer as well (IP a.b.c.d is seen on server w.x.y.z).We are running the following software on an ASA5520.
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Nov 18, 2012
I have an asa5520 runing 9.0 that I want to setup for simple NAT, i,e 4.3.2.1/30 on the outside 192.168.1.1/24 on the inside with dynamic NAT outbound. The new IOS has thrown me for a loop.. I have everything working except the NAT. Any SDM screen shot of the Dynamic NAT entry? even if the IP's are different, I can figure it out...
Also, is there a way to make the unused ethernet interfaces gig0/2 and 0/3 into switch ports on the internal net? (or VLAN like you could do on the 5505)?
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Jun 5, 2012
I need to allow traffic between webserver in dmz and mssql (Microsoft SQL Server 2008).MSSQL use dynamic port (now it is 63796) and this cannot be changed.
Basically, I can allow such traffic using next configuration:access-list dmz extended permit tcp host 1.2.3.4 host 5.6.7.8 eq 1433access-list dmz extended permit udp host 1.2.3.4 host 5.6.7.8 eq 1434 access-list dmz extended permit tcp host 1.2.3.4 host 5.6.7.8 eq 63796
But, I would like to add mssql inspection and I did the next:
class-map class_sqlnetmatch port tcp eq 1433policy-map global_policyclass inspection_default inspect dns preset_dns_map inspect ftp inspect h323 h225 inspect h323 ras inspect ip-options inspect netbios inspect rsh inspect rtsp inspect skinny inspect esmtp inspect sqlnet inspect sunrpc inspect tftp inspect sip inspect xdmcp class class_sqlnet inspect sqlnet service-policy global_policy global
[Code] ..........
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Jun 19, 2011
this is ASA5520 associate with 8.4(1). very simple scenario , three ports: inside . outside . DMZ my problem is how to use network object NAT to perform Regular Dynamic PAT and Identity NAT.
for example, this is my configuration
**** first i configured Regular Dynamic PAT****
object network myinside
subnet 10.200.11.0 255.255.255.0
nat (inside,outside) dynamic interface
**** then , i met problem when i want to make identity NAT between inside and DMZ****
**** if i add below CLI , the first nat line will be replaced ****
**** SO IF I ADD THIS****
[code]......
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May 16, 2011
i am running a vpn between three remote offices, by making use routers that get dyndns. I would like to substitute the existing routers with Cisco 877/876 to get better management. How to do a tunnel by making use of dynamic IPs.
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Mar 8, 2013
My ISP provides two dynamic IP addresses. I have two computers that I want to each have a separate IP. I was told by the ISP, by two different CSR's, that I need a Desktop switch in addition to my Linksys WRT400 router. I purchased the D-Link 8-Port Gigabit Desktop switch and connected everything correctly. Although the internet works on both machines, they are still showing the same IP address. How do I allocate a separate dynamic IP to each machine?
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Feb 23, 2011
having some trouble with configuring dynamic NAT
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Apr 19, 2012
I've got a new 891 to replace an old 837 and I'm struggling to get the dynamic nat pool working.I've successfully configured the dialer etc for PPPoE and when I set up a static NAT translation between my PC and an external address then I can ping hosts on the internet e.g. ping 8.8.8.8 successfully. But when I remove the static translation and try and use the dynamic NAT pool then no NAT translations take place, and show ip nat translations only shows the other static entries.The relevant bits of the config are below and I've also attached a full (cleaned) config.
ip nat pool TestPool 81.2.123.226 81.2.123.226 netmask 255.255.255.248
ip nat inside source list 15 pool TestPool overload
! Can only access internet when static route is defined for my PC
! If I remove this line then it doesn't use the dymnamic pool TestPool
ip nat inside source static 172.16.0.11 81.2.123.226
[code]....
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Oct 23, 2012
I have configured a cisco router 877 to run the Dynamic DSL. However, it cannot work, the ATM 0 interface cannot be up . Here is my configuration:
version 12.4
no service pad
service timestamps debug datetime localtime
service timestamps log datetime localtime
no service password-encryption
[code]....
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Dec 8, 2012
I have one Dynamic DSL line, this line plug to the Dlink router can work properly. But for some reason, we need to change to the cisco 877 router, when I conenct this line to the cisco router, it cannot work, the configuration seems incorrect. [code]
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Jan 19, 2011
I have a PC that I would like to access remotely though VPN. My internet service provider is Time Warner Cable and it provides me with a dynamic Ip address.
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Apr 9, 2013
where I can find a step by step guide of how to setup Dynamic DNS so that my PCs can be accessible from outside the LAN using Remote Desktop?
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Mar 31, 2013
Exactly as the title states. I have looked at my router and whats my IP; made sure I was 100% correctly typing it in. All failed. Even resolves to the same IP.I can remote desktop, visit my forum, minecraft; all via dns but not IP.
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Jan 29, 2013
Okay so I currently have an ISP that offers the standard "2 Dynamic IP's" and I'm wondering how to utilize this? The tech guy said I need a HUB...but I'm not sure what kind and where to get one etc. Secondly, even if I am able to get this second IP going, will they be entirely separate IP addresses? I need the IP addresses to be completely separate and untraceable to the same source. Is this the case or can you somehow trace back the two dynamic IP's to the same source IP? Will I need two different static IP's if I want the two connections to be entirely separate, unrelated, and untraceable from each other?
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Nov 6, 2012
Trying to get a Cisco ASA 5505 to show me all the current dynamic PAT. (I don't want to see hard-coded port forwarding, just dynamic stuff the router is doing to allow various hosts on the network to talk to the WAN.)
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Jul 4, 2011
We just purchased a company with multiple sites using Sonicwall's and Dynamic assigned external IP's. I am running a ASA 5510 with a outside Static.
I have done lots of S2S with both ends static but never a Dynamic to static.
what the commands are to set the ASA to accept dynamic VPN tunnels.
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