Cisco Firewall :: 5520 Dynamic NAT Conversation Ends With Reset-O
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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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 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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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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Oct 30, 2011
Here's the current scenario:
[LAN] <---> ASA 5520 <---> Cisco 2911 <---> [Internet] <---> Server A
|
|
[DMZ]
Whenever I access a website running in "server A" (only HTTP traffic) everything works fine. The problem is that when I try to access a different service on the same server but listening on port 2000/tcp I get the TCP Reset-O message on the ASA and the workstation's browser says that "Internet Explorer cannot display the webpage".
A weird thing: if I access this service from a machine on the DMZ, it works fine. From the LAN (Inside) it does not work. The main difference is that from the LAN to OUTSIDE the ASA does NAT. From the DMZ to OUTSIDE it's just routed. I did another test from the LAN and the captured traffic is attached. I've been messing around with protocol inspects and firewall + NAT rules on the ASA but no luck at all.
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Jun 5, 2012
I have an ASA 5520 for my firewall. (ver 8.0(4))I have an external hyperlink that works from dsl at home but not from behind my corperate firewall.When I filter my real-time log viewer for this destination address I see the build up and immediate teardown of the session.The log indicates the teardown was initiated from inside.The informational alerts are
Built outbound TCP connection 726440542 for outside:201.116.168.172/6666 to inside:172.16.x.x/3586 (65.204.x.x/52001)
Teardown TCP connection 726440542 for outside:201.116.168.172/6666 to inside:172.16.x.x/3586 duration 0:00:00 bytes 77 TCP Reset-I
Reset-I means that something (the firewall or my pc which is the source) is telling the firewall to end the session.
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Jul 20, 2011
how to reset old TCP session on cisco ASA 5520?
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May 9, 2013
I am installing LMS 4.1 to windows 2008 R2 SP1.Server hardware meets requirements.A the end of the installation I am getting from the installation log file the following warnings/errors. [code]
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Mar 7, 2012
how to connect my pc to tv using a cable which has a hdmi at one end and vdi at the other end. The dvi plug is at the back of my pc monitor. After successfully connected, do I have to input data in the pc?
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Jun 8, 2011
ASA 5520 to get it to authenticate VPN users against and Active Directory environment plus allow management access as well. I created a Dynamic Access Policy on the ASA stating that if you are a member of the Active Directory group "Managment" the continue. I chagned the DefaultAccessPolicy to "Terminate". So with that, VPN users cannot connect because they are not a member of that group, but the access to manage the ASA is allowed because of that policy.Is there a way through using Dynamic Access Policies that I can allow management access (SSH, ASDM, etc) by matching to a group membership and will allow normal users to VPN in successfully but not allow them access to managing the ASA?
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Nov 5, 2012
We currently have an ASA 5520 communicating with 10 ASA 5510's, all on static outside addresses. I was asked to add 5 additional 5510's on dynamic address. All worked well in testing until it was decided that some of the dynamic clients needed to talk to each other.
My testing shows packets just dying in the 5520.
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Jun 29, 2011
Can the ASA 5520's support dynamic IP for site to site VPN
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Sep 29, 2011
how to setup a both ends of an IPSEC VPN tunnel using a software client such as shrewsoft vpn and an 800 series router?
I've tried following the instructions on cisco's site, but I don't really understand which interface I should use? Dialer, VLAN1 or UnNumbered to a Loopback?
I'm OK with most basic features of the router, but never had any luck with VPNs?
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Nov 5, 2012
We have Fiber link down down from both ends. From switch A goes to fiber box then to other fiber box then to switch B.
Switch A
Model: WS-X4418-GB-Gbic
Type: 1000BaseSX
Switch B
Model: WS-C3750G-24TS-1U
Type: 1000BaseSX SFP
Both sides are configured as trunk .
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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 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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Sep 30, 2012
The school I work at upgraded to Cisco Catalyst 2960-S switches, all connected to each other via fiber. I am seeing a problem with one such connection. Cisco Network Assistant showed a "4-Warning" regarding the fiber link port: port was disabled because it was fluctuating between up and down too rapidly. Possible hardware problem, resolve and re-enable. (I'm paraphasing the message...it was 'acknowledged', and I can't bring it back up.)
This message was only showing on our "SV-Copy-Rm" switch's port 49. The other end, on "SV-Maint-Rm" port 49 showed a normal green link status.
Using Internet Explorer, I logged onto SV-Copy-Rm switch's Device Manager, and I first tried disabling/re-enabling port 49 on SV-Copy-Rm. It came back up blinking yellow and showing "port has bad link" when I cursor hovered over port 49. This continued for a few minutes, followed by port 49 being disabled again.
The current thing I'm trying is swapping the connection on both ends to a spare pair of fibers. I'm pretty certain I've swapped to the same pair on both ends, however, now neither switch shows an active link. I've disabled/enabled the ports on both ends, but still no link.
Question: How do I re-establish the above link? (The active connection has 'fallen back' to the designated ethernet Cat 5e connection and is currently running with that connection.)
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Nov 21, 2011
i have my Cisco E4200 set up with a 6rd tunnel. the tunnel seems to work fine for the most part. i can ping ipv6.google.com and get a response.however, i cannot ping the addresses of the IPv6 Tunnel ends from within my network. If i run a ping from outside the network, i can ping the IPv6 address of the server end, however, i cannot ping the E4200's end of the tunnel. is there a specific option that needs to be set? i have allowed ping so that my IPv4 address is pingable, am i missing something for IPv6?
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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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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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Nov 2, 2012
We were using ASA-5520-K9 with ASA-SSM-AIP-20-K9 but recently found some hardware problem in our running ASA. Now cisco want to replace with ASA-5520-K8.
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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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