Cisco Firewall :: 5510 - Connections Routing Between Two Internal ASAs Fail
May 19, 2012
We have a site with two inbound circuits, one for internet and one for our MPLS. Each circuit is being terminated by a 2921 Router and matching ASA 5510 Firewall. For the internal network, the Internet ASA's inside interface (172.16.0.1) is the default gateway for all hosts. OSPF is the routing protocol between all the routers and ASA's and routing is working. In fact, ICMP is working as well. From an inside host (172.16.0.81), we can ping anything on the MPLS network. But when I try to use telnet (for example), the connection fails. If I add a route to 10.10.10.0 to the host, or re-configure the host to point to the MPLS ASA (172.16.0.254) as it's default gateway, connections will establish.
Both ASAs are running 8.4(3), and have the following commands:
same-security-traffic permit intra-interface
interface Ethernet0/0
nameif outside
[Code]....
And from the MPLS nodes, I can see a tcp request is made.
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Apr 12, 2011
I need to upgrade the active/standby failover pair of 5510 ASA's to have1 Gig DRAM each, and I am trying to plan out the upgrade process. I'm looking for a zero downtime upgrade process.
I know that the failover pair has to have the same amount of memory, so how do I perform a zero-downtime upgrade process?Can I power off the standby unit and upgrade it's memory first? Or will it cause a memory mismatch between the active and standby units when it is powered on?
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May 17, 2012
Having trouble with a couple items. First of all, should I be able to ping the inside interface of the ASA from all internal subnets assuming all of these subnets/vlans are directly connected to the same L3 switch? I can ping the ASA inside interface from our L3 switch, but I cannot ping the inside interface from a host on a different internal subnet. I have setup static routing on the ASA [
route inside 10.10.96.0 255.255.248.0 10.30.1.1 1]and verified that I can ping the host [10.10.96.212] from the ASA inside interface [10.30.1.5]. The inside interface is on the 10.30.1.x/24 subnet. My host is on the 10.10.96.x/21 subnet. From the ASA I can ping 10.10.96.212, but I cannot ping 10.30.1.5 from 10.10.96.212. I can however ping 10.30.1.1 from 10.10.96.212.
This leads to my next issue, which is trying to setup the ASA to work concurrently with our current firewall. I'm doing this in order to transition to the ASA. I'd much prefer to cutover inbound NAT a little at a time vs. doing it all at once. Our current firewall is setup at 10.30.1.2 and this is the default route on our L3 switch (0.0.0.0 0.0.0.0 10.30.1.2). So my question is, if I setup an inbound NAT to one of our web servers on the 10.10.96.x subnet, will I be able to get it to route back to the ASA as opposed to ending up in asymmetric routing **** since the default route points back to our other firewall?
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Apr 16, 2013
I am having a problem getting my ASA to work properly. I attached a diagram for reference and most of the config is below. When I finally got it to route properly between 2 sub nets on the internal network, the NO NAT statement broke routing for the VPN Clients who rely on a NAT statement for the same sub net that is listed in NO NAT access list. I can get one of the 2 to work by replacing NAT statements but can't figure out a combination to allow routing for both the internal sub nets and the VPN clients to work.
It's been about 5 days of tweaking this thing just to get the internal routing to work correctly and when I finally did I broke VPN client access. To note, the VPN clients can still log in and get a session going, they just can't get anywhere once they are in. I also think there's a lot of stuff in this config that is not needed like a lot of the object groups, etc. but I am being very careful about removing anything. I took over support of this ASA after someone else put it in place and over this past weekend we moved it to a new building and new ISP and that is when I had to get it to route between sub nets. The main point of this move was to remove building 1's reliance on building 2 for Internet and outside email access in the event that building 2 is not available (it is close to water and this has happened more than once over the past year).
So that is why I can't go with the smartest option of just keeping the routes on the router in the other building. I also know the 1600s are ancient but they're all we have for now. I can provide those router configs also but they are VERY basic, all static routing. The IP for the Cisco router on the same sub net as the ASA is 192.168.42.254.
This is the statement that allows the routing to work between the 2 internal sub nets but breaks VPN clients: nat (INSIDE) 0 access-list NO NAT
This is the statement that allows the VPN clients to work but breaks the internal routing: nat (INSIDE) 0 access-list INSIDE_nat0_outbound
The rest of the config is below the diagram.
ASA Version 8.2(2)
host name Cisco asa
domain-name default.domain.invalid
enable password - encrypted
password - encrypted
names
dns-guard
[code]...
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Sep 18, 2012
We have a second ASA 5510 that is suppose to be a hot standby. I need to find out that, as a hot standby, does it have to have the same licenses as the ASA that it backs up. We purchased 50 SSL VPN licenses for that unit. If it fails over, we need to make sure the failover asa can allow SSL VPN connections.
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Feb 22, 2012
I have a IOS firewall on a 2921 router, zone-based config. The remote and main sites have Cisco WAAS , running 4.4.1 software. I am using WCCP redirection on the WAAS/router combination. If I leave it off the firewall passes SSH correctly to the devices on the other side of the firewall. If I enable WCCP the SSH connections fail. The SSH to the router itself is fine, I am not using the self zone for router protection. I had seen a few posts on WAAS but the only one mentioning a config statement in the firewall was on 4.0 WAAS and the command is no longer on the IOS firewall. Is this supposed to work transparently or am I missing a config?
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May 29, 2012
I am having an issue when implementing an additional internet connection on our ASA 5510. The new connection is "TWCOutside". I was my understanding that static NAT would force our externally hosted servers (Email, PPTP VPN, and FTP) to continue to utilize the "ATTOutside" connection. Our remote site-to-site VPN traffic has two static routes configured to force it to continue to use the ATTOutside connection.When I switch the metric on the 0.0.0.0 0.0.0.0 98.103.148.145 route to 1, and change out default dynamic xlate to use "TWCOutside", it "mostly" works as expected. Email, the PPTP VPN server, and our remote site-to-site VPN server continue to use the ATTOutside connection as designed. Our end users begin using the new connection for thier internet browsing.
However, our FTP server, in the DMZ, completley loses outside access. It cannot ping to 8.8.8.8, or resolve DNS queries. The is a static NAT statement for this server, as it is using one of our dedicated public IP addresses. I need it to continue to do so for the next few weeks.Effectivley, we just want to give our end users internet browsing on the new TWC link, but leave everything else on the old ATT link for the time being. The only problem I am having is the DMZ connection. I am currently "rolled back", so no one is using the new connection until I figure this out. I can easily switch the metric and dynamic PAT back to using the TWC connection, but I need to have some things to try with the DMZ before doing so. [code]
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Jan 30, 2012
I know I can use the RTR statement to determine when the primary ISP circuit goes down via this technote: url...My question can I assign static Nats on the backup ISP connection to the same inside servers in the dmz.?Example 10.1.1.11 is mapped to ISP1 ExternaIP of 65.217.77.11. Can it 10.1.1.11 also be mapped to ISP2's 208.217.77.11?This way I can get my DNS changed and my inbound traffic to servers in my DMZ on the asa 5510 running 8.0.3 code can continue to receive Inbound traffic.
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Jul 7, 2011
I have a vpn ssl remote access with a fw asa 5510 version 8.02. When users use any connect vpn ssl they in the Lan can access to the servers,but they can not access using ssh or telnet to inside fw asa.
aaa authentication ssh console LOCAL
ssh 0.0.0.0 0.0.0.0 outside
ssh 0.0.0.0 0.0.0.0 inside
ssh timeout 30
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Apr 2, 2013
I have a dual ISP, 1 primary and 1 secondary terminated on fa0 and fa2 on our ASA respectively. ASA was configured so that, when the primary fails, the secondary kicks in. [code]
It was until yesterday that we experienced downtime on the primary ISP that the secondary doesn't do the fail-over. I have to manually configure the device to use the secondary ISP. Currently, I'm looking at maybe this has something to do with the licensing.We are currently using a Base License, should we be upgrading to Security Plus?
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Feb 17, 2013
I'm looking for automating a couple failover scenarios. Both VPN redundancy and black hole internet traffic redundancy.I currently use the more reliable T1 connection for the VPN connection and the DSL for internet traffic.My current configuration is working but requires a manual update to get the VPN or black hole back up and operational when either link fails.
[code]....
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May 21, 2012
I am using a 6500 with FWSM. I need to separate an internal server/HQ network from 3 or 4 different external connections. The external networks do not necessarily need to be isolated from each other.I have the option of using a 3 layer model: L2 Access layer to SVIs on the Distribution layer and then L3 to the 6500.L2 Access, connecting directly to the 6500s, with the SVIs on the FWSM.Is it better to have the FWSM outside the MSFC or Inside? Am i correct in thinking that "inside" vs "outside" is determined by whether the SVI's are configured on the FWSM or the MSFC? is there any performance impact from having the FWSM doing the routing instead of the MSFC.If the vlans are all configured on the FWSM, what is the 6500 doing, other than providing switch ports?
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Dec 14, 2012
We just changed ISPs and now have a /29 routed subnet to be used on our ASA 5510 (8.4) instead of the one public ip we had before.There are a couple of PAT translations that were previously setup on the "interface" address which i now want to assign to a different ip address further in my subnet.
So i just changed this:
object network BMMM
nat (inside,outside) static interface service tcp smtp smtp
to:
object network BMMM
nat (inside,outside) static other.external.ip.in.subnet service tcp smtp smtp
And assumed that this would work,y it does not, and this leaves me unable to contact that machine from the outside.And shoud i also change my access-list?The relevant access-list rule is:access-list outside_in extended permit tcp any object BMMM eq smtp
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Jun 11, 2013
I've been following most of the comments in regarding how to allow communication between two internal networks on a ASA5510 8.2.5 But I am still a little confused about to how to set my firewall. I made chages to it and still do not have the desired results.
I need to allow comunication between Interface 0/1 and Interface 0/2. See configuration file with fake or dummy ip address below.
ASA Version 8.2(5)
!
hostname ciscoasa
domain-name lxx.com
[Code].....
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Sep 18, 2012
I've tried a bunch things but it didn't work, I'm about to gave up! :-/
I have the following scenario:
ASA5510 - v8.3(2)
Interfaces
ETH0/0 = outside = 189.xxx.xxx.129
ETH0/1 = inside = 10.xx.1.15
[Code]....
What should I do to get the SIP and 8080 port working on my Public IP, likewise just as access from my browse the http://189.xxx.xxx.129:8080 and get through directly to my internal server 10.xx.xx.61 ?
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Feb 4, 2013
I have inherited an asa 5510 whit 4GE SSM module installed. The asa runs fine, but i can not use the 4GE SSM ports. Using ASDM or console i can get and configure the gigabitethernet1/x ports but i can not get traffic on it. The ping from the console to the ip address of the Gigabitethernet1/0 is successful. On switches or hubs connected to those ports i can not see the port's mac address. The two Internal-data0/0 and Internal-data1/0 are down and i can get they up. How to configure 4GE SSM or ASA internal-data ports.
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Jan 19, 2013
Is it possible to perform static Nat's through an internal network?I have a ASA 5510 with a public outside interface (let’s call it 68.68.68.1), and I have an inside private IP address (192.168.1.2/24). The inside IP address leads to a 4900m with that interface being configured with a 192.168.1.1 (no switching). On the 4900 M I have several VLANs one of them is an internal DMZ of sorts. (192.168.2.0/24). Within this DMZ network are several Web servers which need to be associated a public IP address (68.68.68.x).
Every time I configure a static Nat to associating a public IP address with an internal IP address within the DMZ, packet Tracer on the ASA informs me that the packet gets dropped at the static Nat and I cannot figure out why this is so.Safe it to say my question still stands is it possible to Nat (68.68.68.222 to and 92.168.2.60) given the configuration above, and how would I go about configuring in such the manner above so that I acn apply static nat through the 192.168.1.0 network to reach the 192.168.2.0 network.
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Apr 22, 2012
I am tasked with transferring all clients from one subnet to the other. I figure the nicest way to do this is to temporarily have the subnets talk to each other in an endeavour to avoid as much downtime as possible. The two internal subnets are:
192.168.0.0/24
192.168.43.0/24 (the intended migration network)
I am beating my head against the desk here as I dont seem to be getting anywhere after the changes I have made. The current configuration is as such:
ASA Version 8.2(5)
!
hostname ciscoasa
domain-name *****
enable password ***** encrypted
passwd ***** encrypted
names
[code]......
Upgrading the firmware is not really an option?
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Sep 25, 2012
I was just wondering if it's possible with an ASA 5510 to connect to the external IP address of an internal server from inside the network. I have already set up dns doctoring for dns lookups, and everything is working fine there. We have an application inside the network that tries to connect straight to the external Ip of another internal server. where to look in the ASDM 6.4?
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May 12, 2012
I have an ASA 5510 configured 3 interface Internet_AAPT, Internal_Network and Server_Network. The server network works fine as is able to connect to the internet and services like port 80 work from the internet in. But from the Internal_Network can only get to the server network but not internet (6May 13 201214:17:4030201310.153.111.21253663199.47.216.14880Built outbound TCP connection 42508 for Internet_AAPT:199.47.216.148/80 (199.47.216.148/80) to Server_Network:10.153.111.212/53663 (10.153.111.212/53663). The weird thing in logs i see a connection being made but for some reason its referring to the Server_Network interface? below is my current config...
ASA Version 8.2(5)
!
hostname ASA01
domain-name names
name 10.153.11.184 QNAP
name 10.153.11.192 exc2010
name 10.153.11.133 zeacom
[code]....
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Dec 18, 2012
I have the syntax correct and thought process down right on a solution to allowing guest wireless users access to an internal webserver. (DMZ discussion aside)
We have an ASA5510 with interfaces setup as:
outside - 65.x.x.x address
inside - 172.20.1.2
guest_inet - 10.2.1.1
Internally clients resolve our website to 192.168.40.40 and that part works as it should. Clients outside of our network resolve our website to the correct external address (lets just call it 1.1.1.1). We have a NAT statement static (inside, outside) 1.1.1.1 192.168.40.40 netmask 255.255.255.255 and an ACL to permit tcp any host 1.1.1.1 eq www
Clients on our guest_int use an external DNS server and hence resolve our website to 1.1.1.1. However it seems traffic goes out and back in our outside interface and this connection never occurs.
What I'm wondering is the correct NAT statement / ACL to add that would allow our internal clients on the 10.2.1.x network to access our internal website. Would that be: static (inside,guest_inet) 1.1.1.1 192.168.40.40 netmask 255.255.255.255 ? Since there is already an ACL permitting port 80 traffic to 1.1.1.1 we should be taken care of on the ACL side of things, right?
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Feb 20, 2012
I am working on replacing our Checkpoint Firewalls with ASA's, and am running into the following NAT problem. On some of our Checkpoints, there are external NAT's that are mapped to multiple internal hosts based on ports.Is there any way to translate that to the ASA? I'm not sure the ASA will let you have multiple internal hosts mapped to one external IP using static NATs. The main issue, is these are alarm panels that receive data from external hosts (the traffic is initiated externally on the Internet) so I can't use dynamic PAT with this.
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Dec 5, 2012
Since the power failure two days ago, my -ASA stops forwarding traffic to internal servers, for no apparent reason. Packet trace shows all OK, packet capture buffer stays empty when I try to http into the mail server. The only way to get it working is to change the Outside Ip to the one used for mail, then to change it back. It will work OK for a few hours, then stop, with nothing obvious in the logs.
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Apr 5, 2013
Is it possible to have a Cisco ASA5510 with two internet connections performing as follows.
Internet A---------All traffic except LAN to LAN vpn
Internet B---------LAN to LAN vpn
I cant find anything definitive on google to say it will or wont, i know it cant do policy based routing.
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Aug 1, 2011
We are in the process of getting two new connections pulled in that I would like to utilize in the following configuration.
DS3 - 45/45 I would like to use this circuit for all of our servers to NAT out of as well as our VPN tunnel to our remote site. It will be much more reliable than our cable line.
Cable Internet - 50/10 I would like to use this for all internet traffic that users generate. I would like to be able to fail over to the DS3 if this line goes down.
To get all traffic go out the cable line would take a dynamic NAT rule and a default route. How would I automate a failover to the DS3 with a backup route and dynamic NAT rule?
I understand that if the DS3 goes down it will take manual intervention to bring the tunnel back up and servers with static NAT will need reconfiguration.
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Sep 12, 2011
normaly the agents has a persistent connection with the kaseya server (monitoring server),The connection re-established afther the next check-in of the agent, instead of a persistent connection. Now we need to wait to the next check-in before we can connect to the agent. This is a big performance issue, the check-in time of the agents are 3 minutes.I see a lot of the following messages in de syslog:
6Sep 12 201120:27:48302013customer site527985721Built inbound TCP connection 5418112 for outside:(customer site)/52798 (customer site/52798) to inside:kaseya server/5721 (outsideIP/5721)
6Sep 12 201120:29:09302014customer site527985721Teardown TCP connection 5418112 for outside:(customer site)/52798 to inside:kaseya server/5721 duration 0:01:21 bytes 45 TCP FINs
I create a normal static nat rule from the kaseya server to a public ip address, and i define the protocols in de secutiry policy.ICMP has been allowed.cisco asa details:System image file is "disk0:/asa824-k8.bin" This platform has an ASA 5510 Security Plus license.It's look like a connection time-out between the agents and our cisco asa.
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Dec 5, 2012
Our Cisco ASA 5510 running 8.4(4)1 just started dropping packets and our AnyConnect clients are seeing horrible performance. The system is extremely slow compared to just a couple days ago.Nothing has changed on the system. I can post the configs if needed.
firewall# sho int
Interface Ethernet0/0 "outside", is up, line protocol is up
Hardware is i82546GB rev03, BW 1000 Mbps, DLY 10 usec
Full-Duplex(Full-duplex), 1000 Mbps(1000 Mbps)
Input flow control is unsupported, output flow control is off
Description: == WAN Interface ==
[code]....
I have done a "sho vpn-sessiondb detail svc" and I can see the dropped packets of the individual users, but cannot see why the packets are still dropping.how I can correct this and restore speeds?
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Sep 20, 2011
I have an ASA 5520 running, user web trafic, incoming VPN and systems NAT for DMZ services. Nothing new for a standard firewall. I have upgraded the memory in it to 2GB, per Cisco so that I could install and run IOS 8.41. I have uploaded the both the IOS bn image and the ASDM 645 image and set it as the primary boot file. When I reload the ASA, everything boots fine, no errors and all traffic appears to be working fine.But here is my problem:ALL the previously configured VPN sessions will connect to the ASA and show that they are passing traffice (TX and RX increments through the monitor) but if I try to access a device on the other side of the VPN or they try to access services in the corporate network, the connection fails. Ping works, So I know I can reach the devices and the tunnel has been correctly created, but nothing else, . I did not change anything in the configurations for the VPN connectors.But, if I reload the ASA with the 8.21 version image, everything works just as before and all connections are good.
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Sep 17, 2012
I'm setting up a Site-to-Site Cisco VPN between ASAs. I'm being told by the remote site engineer to set the maximum MTU at 1362. Is it possible to set the MTU for one specific site-to-site VPN on my ASA 5510 Security Plus to MTU 1362? I see my interfeces are all set at 1500. If not, would you recommend I setup a subinterface on my inside network router and a subinterface on the ASA with an MTU of 1362 to get around this issue? Then use this subinterface for traffic from my inside network to transverse through prior to hitting the VPN.
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Jan 16, 2013
I just learned that the licensing structure for the ASAs is changing, but I don't have any details. We have roughly 30 ASAs (from 5505s to 5585s). If there's a licensing change, I need to do an impact assessment and plan accordingly.
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Jul 2, 2012
I'm trying to configure policing and/or shaping on a setup of 2 x ASA 5505 Sec Plus. The units are placed in office A and office B and each have a ISP connection to the internet and a leased line with a capacity of 4/4 Mbit/s for interoffice communication.
On each ASA there's four subnets. VLAN 200 is used to connect the offices through the leased line.
Subnets:
Outside = 2
Data = 10
Voice = 100
Linknet = 200
I've read a lot of articles and posts about shaping and policing on the ASA but still can't get it to work like I wan't to. I'm trying to limit all traffic besides IP-telephony traffic to 3 Mbit/s and thus reserving 900 Kbit/s for voice traffic. I tried setting a service-policy on the linknet interface on each ASA and set Traffic match to Any traffic and QoS settings for both input and output.
I can see traffic passing the policy when I run the "show service-policy police" command but it never seems to be high enough to be policed which is strange since the ASDM monitoring shows that I'm pushing 3900 kbit/s. I file transfers verifies that policing does'nt work.
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Dec 3, 2012
I am having problems with these types of 3G cards(EHWIC-3G-HSPA+7) from Cisco.We are using them on ships where we have a SAT connection and the 3G connection. Fail over between the two connections are handled by an IP SLA echo and a track on the cellular interface, towards an public IP where we have configured a static route to via the Cellular interface.
Once configured the connection comes up fine, the VPN tunnels comes up and all is good.But after some time the connection dies, the track goes down because no data goes through.a sh cell 0/0/0 all however say that the profile is active.
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Jan 15, 2013
is it possible to configure a Cisco 881 router to split the incoming internet connection between two ASA's? If one ASA fails then the router would switch traffic over to the second ASA. The 2nd ASA would takeover from the primary ASA through the active/standby failover configuration and crossover cable. I'm trying to avoid configuring the switch to control the traffic using VLANS if possible.
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