Cisco VPN :: How Much CPU Impacted By SSL VPNs On ASA 5500
Aug 16, 2011
How much the CPU is impacted by SSL VPNs on Cisco ASA 5500's?I believe that the ASA offloads a lot of its encryption/decryption on a built in VPN accelerator rather than placing load on the main CPU. Is this correct?
According to the ASA 5520 specs - it can handle a throughput of up to 225Mbps of VPN traffic. Of course, it does not say whether this is SSL or IPSEC but I would like to understand what impact say 100Mbps of SSL VPN traffic would have on the main CPU.
We need this information to gauge whether an existing firewall has enough capacity to cope with existing load plus additional new SSL VPNs.
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Feb 1, 2013
I am putting an pre-labbed DMVPN Hub config onto a production 1841. We had to upgrade the IOS to support protection with NAT so the current IOS we're running is c1841-adventerprisek9-mz.124-25g.bin.I can paste the configuration in fine (via the tunnel interfaces) and the router accepts it however the 'show dmvpn', 'debug dmvpn' and other related commands don't work. I have checked the IOS feature navigator and it definitely shows that DMVPN phase 1 and 2 are supported in this image.
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Feb 1, 2012
Actually I have to make a VPN between an 5520 ASA and a Cisco 887VA-K9 Router. Connected to ASA I have the outside interface, the inside-DMZ interface, the PCs interface and the VoIP interface. In the other site I will need to have a new subnet and a VoIP phone which I need to connect to the VoIP subnet in the other side in order to work with our CCM servers.I need two VPN established between ASA and 887 Router?
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Oct 24, 2011
I have a pair of 5505s with an IPsec VPN between them. On the first 5505, I also have a user connecting to it via client based vpn. The user cannot access systems on the other side of the ipsec tunnel. That 5505 protects subnet a.b.c.d, the user is on subnet a.b.e.d which is not inclusive to a.b.c.d. First, am I correct in the assumption that I need to add the vpn network of a.b.e.d to the list of protected networks, and second if I change the list, does it drop and reset the ipsec vpn?
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Mar 24, 2013
I've got a setup where we have a wireless connection coming in and using mikrotik router. We have multiple stores coming in via the wireless with a dmvpn.
The vpn's terminate on the cisco c870 and can be seen when running: show dmvpn.The cisco has a default route to the fibre router (10.0.0.252). The wireless router is the default gateway for the network. The failover from wireless to adsl fails. (due to the cisco routing traffic back to the wireless router when wireless fails)
If I change the default route on the cisco to dialer1, the failover works, but none of the vpn's connect. The Branches all have dynamic ip addresses. The HO has a static ip.
My goal: I want to achieve adsl failover for when the wireless goes down and still have the vpn's connected.
Can I have some sort of "Dynamic" route on the cisco. So when the vpn traffic comes in via wireless and hits the cisco, the vpn traffic can then go back out that way via the wireless router, but still have a default gateway on the dialer interface for failover?
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Feb 22, 2012
I have been endlessly searching around online, and trying things on the firewall, and cant seem to find an answer to this problem. Its probably something really simple right under my nose! I am using an ASA 5510, which currently has a few seperate site-to-site VPN connections configured, which connect to other Cisco devices on clients networks.
I work from home, so also connect to our network using Remote Access VPN (any connect) to connect to the network at the data centre.
Just to be clear, here is my amazingly drawn network diagram:
[[my house]]-------------- <any connect VPN>------------[[ASA 5510 / Data centre]]-----------<site-to-site>-----------------[[Client network]]
The problem I am having, is that I cannot connect directly from my house to the client network, I need to RDP into some server in the data center, then from there I can see the Clients network. Is there routing to be setup somewhere? between VPN's? Ive looked into the routing options on the firewall and cant seem to find anything that works. I've searched for this and cant find answers, even some sources saying its impossible.
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Feb 20, 2013
how many VPNS are configure in this device
the o/p:
sh vpn-sessiondb
Active Session Summary
Sessions:
Active : Cumulative : Peak Concurrent : Inactive
SSL VPN : 0 : 0 : 0
Clientless only : 0 : 0 : 0
With client : 0 : 0 : 0 : 0
Email Proxy : 0 : 0 : 0
[code]...
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May 20, 2011
I have a Cisco 877 ADSL router which won't let me play with my VPNs like I used to in pre-Cisco days.I have a VPN server which resides on the inside of the network which used to get it's L2TP as well as PPTP tunnels passed straight through the ADSL router. No problems there with the old router.Now I opened the relevant ports for both TCP and UDP on the 877, but VPN simply won't establish when trying to connect from the outside. Process of getting the 877 to stop wanting to take charge of things VPN and just pass them off to an inside server?
I need to VPN into my work from my laptop on the private side of the 877. This works fine until after authentication, then the VPN connection goes silent, no traffic going through. Works fine when for instance using my iphone hotspot to connect through from my laptop. It's only not working when the 877 is in the equation.
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Jul 2, 2012
We have a corporate site with a Cisco ASA 5580 (8.1), a remote office with a Cisco ASA 5510 (8.2) with a L2L VPN to corporate. A vendor has a L2L VPN to the corporate ASA with access to the remote office across the VPNs (hairpinning). The corporate office accesses an application at the vendor on port 23. Everything is working with regards to the vendor accessing resources to the remote office and the corporate office accessing the application at the vendor. Our goal now is to restrict the vendor to port 23 from the corporate network and port 9100 to the remote office. On the corporate ASA I setup a VPN filter and applied to the vendor's L2L vpn but when I apply the filter (see below) all traffic stops to the vendor such as telnet.
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Nov 28, 2011
I have both a Easy VPN server and a site-to-site VPN on the same outside interface of a 2911 router.
Currently, a Easy VPN client has no route int the router then out the site-to-site VPN to the remote site.
How can I create this route?
[code]...
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Jun 6, 2011
So I have a server running Linux and am looking to add VPN functionality to my home network. I have OpenSSH running and it works great for tunneling and remote file transfers but doesn't quite get the job done.I would like to be able to map a network drive in Windows to my Linux box and understand a VPN could accomplish this, problem is I really don't know anything about Virtual Private Networking! I was hoping someone could explain to me the differences between SSH / VPNs and point me in the right direction towards configuring OpenVPN on my Linux box.
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Mar 21, 2011
I've been reading this site for a while, and finally decided to post I'm really interested to see what everyones opinion on this is.My company currently uses what i would call traditional site to site VPN's using crypto maps, main site has a pair of ASA's in HA and remote sites use ISR's like 1801's.I've recently been playing in my lab with GRE tunnels using IPSec protection (note this is config from my labs, so ip's and key's are just randomly selected)
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Jun 15, 2011
what is the maximum number of Lan-to-Lan and user vpns supported in the ISR G2 2911 and 2921?
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May 12, 2013
I'm having trouble setting up a second IPSec VPN tunnel on my Cisco ASA 5505 to another office. I was able to setup the first one with no problem through the ASDM, but have not been able to get the second one up.The IPSec tunnel is connecting to a WRVS4400N router at the other office. I tried debugging crypto isakmp, and crypto ipsec, but I'm getting nothing. Below is the config. Does something look wrong on my end? I also attached a screenshot of the parameters setup on the remote router.
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Oct 12, 2012
I am setting up a simple remote IPsec VPN with a ASA 8.4. All I want to do is the remote user can VPN into the ASA, from there, he can browse the outside Web pages in the internet. and we'd like not to use split-tunneling. The outside infterface is 192.168.1.155/24, which is inside our network and this subnet works fine to outside. The pool for vpn is 192.168.0.0./24 (please pay attention to the 3r octet)
I configured and the remote user can vpn in and get an IP from the pool. but it seems that he cannot do anything. he cannot ping anything.I suspected the NATTing that i use. What is configured wrong? What traffic need to be natted and what need not.
======:ASA Version 8.4(2) !
!interface GigabitEthernet0description VPN interfacenameif outsidesecurity-level 0ip address 192.168.1.156 255.255.255.0 !interface GigabitEthernet1description VPN interfacenameif insidesecurity-level 100ip address 192.168.0.1 255.255.255.0
!ftp mode passiveobject network obj-192.168.0.0subnet 192.168.0.0 255.255.255.0object network obj-192.168.1.155host 192.168.1.155access-list EXTERNAL extended permit ip any any access-list EXTERNAL extended permit icmp any any access-list vpn extended permit ip 192.168.1.0 255.255.255.0 192.168.0.0 255.255.255.0 pager lines 24mtu outside 1500mtu inside 1500ip local pool testpool 192.168.0.10-192.168.0.15ip verify reverse-path interface outsideicmp unreachable rate-limit 1 burst-size 1icmp permit any outsideicmp permit any insideno asdm history enablearp timeout
[code]....
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Jun 30, 2012
I want to split my traffic between two ISP's. I want all traffic to pass over one connection EXCEPT my VPN tunnels, which I want to use the second ISP. How should I set up (protocol binding?) to accomplish this? (I have run into various problems trying to load balance all traffic. So I am trying to "partition" traffic.)
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May 22, 2012
The current setup we have contains two seperate networks, each managed by their own Cisco RV042 (10/100 4-Port VPN Router), and each have their own connection to a Comcast Business Class SMC Modem. (Each has its own static WAN IP provided by Comcast). Both VPN routers have VPN access configured allowing us to connect to our company's corporate intranet and network, and vice versa. Just as a reference point, We will call the first VPN 'GamesNetwork' and the other one 'AdminNetwork'. A problem came up where the computers on AdminNetwork could not access the resources of the GamesNetwork. The problem was resolved by our at-the-time official corporate IT guy but the solution was never explained to me. Recently i got curious and went into the config pages and found that each VPN router was linked to the other the same way corporate links to our VPN's, whch is by using the Internet IP of that vpn... So to me this says we are linking two local vpn networks using their internet connection which is on the same modem.. to me this seems messed up. is this really the way it needs to be done? Now... I have thought of the idea 'make the two networks into 1..' and it could work. but.. i dont have the permission to make this happen.
if you have two vpn routers side by side in the same room, is there a more local means of giving 1 vpn access to the resources of the other and vice versa?
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Jul 1, 2012
I use a cisco asa 5520 to terminate multiple site to site VPNs. Due to the configuration of a parteners network, i have had to install 2 routers into this parteners network, i have been supplied static private IP addresses for each router each router has a unidue LAN subnet which is the VPN's protected network.The partener use's PAT with only one public facing IP address.The VPNs are initiated from the parteners network using an IP sla ping.
Upon installing my first VPN router in the partenrs network, once NAT-T was enabled on the local ASA the VPN started working fine. After installing the second VPN router i tried installing the new config on to the ASA but via CSM, the ASA complains that it can not have 2 VPN's with the same peer address configured.
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Sep 9, 2012
I would like to create two site-to-site VPNs, one for data and one for VoIP, between the same sites. One end is an ASA 5510 and the other is a third party firewall. Is this possible if I use different sets of IP addresses for each tunnel?
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Jul 12, 2012
I have to connect through VPN for work so that I can RDP into my remote development machine, but their internet speed is painfully slow. Is there any way I can route my general internet browsing traffic through my local connection, while still maintaining the VPN connection to my remote box?
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Jan 26, 2012
I have recently installed four Cisco RV042 v3 VPN routers for a customer of ours to replace existing Nortel Contivity 1010 devices which were providing VPN tunnels from the customer's 3 branches to their headoffice. The original Nortel devices were working perfectly but the customer wanted some firewall rule changes and the Nortels were proving to be somewhat inflexible and incomprehensible in their configuration hence why they were replaced.
When installing the Cisco routers I configured the VPN settings to match the Nortel device settings so that I could swap out a branch at a time without taking the whole setup down for a day.The customer has a Unix based dumb-terminal application running on a server at headoffice that they access from their branches using terminal emulators on Windows PCs and thin client hardware devices that support vt100 terminal emulation.
Prior to installing the Cisco RV042's everything was working fine. Now they are using the RV042's they keep getting the sessions from their branches dropped. Both PC users and thin client users are losing sessions and it happens with active and idle sessions. I have checked the logs on the routers when users are disconnected and there is nothing logged at that time (other than my login)... I had thought maybe it was to do with tunnel renegotioations so I have set to phase 1 / phase 2 SA timeouts to 86400 & 28800 seconds respectively but this has had no effect. I had also seen somebody advised disabling 'SPI' in the firewall... I have tried this and it makes no difference.
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Sep 21, 2011
We have an ADSM (version 5.2(3) ) . In ASA ( version 7.2(3)) we are working with routing, access restriction and configuring IPSEC vpn with integration to our AD. We need to get two diferent profiles: one for networking administrators, who are going to manage routing, acls and have the root for ASA, and the other profile is going to be for the vpn administrators. As I read from the ASDM 6.0 user guide is posible define command privilege level. So do you consider posible to define a particular level for all the command related with ipsec vpn (Create, Modify and Delete) and asociate that particular level with the user for vpn administration.
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Dec 16, 2011
We're trying to get a new ASA 5505 put in place on our network after the untimely demise of our 1841 router. One of the functions of the router that we need to get back up and running is a pair of VPNs to employees that we have working from offsite. These are site-to-site VPNs.
They worked with the 1841 in place, so I know that the other end works. I'm just having trouble configuring the ASA to match. I've been through the wizard in ASDM a couple of times, but have yet to have any luck getting it to connect.
Attached are config files for the 1841 (with both VPNs) and the 5505 (with only 1 VPN in place). What I may be missing in order to get this working?
One note - I am having some trouble with my NAT configurations (another post pending), but I think they are close enough that I hope it's not interfering with the VPNs.
If I can get one running, the other has a nearly identical set up, so I should be able to get the second pretty easily.
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Feb 2, 2012
we use an asa5520 like vpn termination point, asa uses acs5.3 for authentication purpose, and all seems to work properly,but acs5.3 doesn't purge user sessions when vpns terminate; I can see many user "logged-in" into menu System Administration --> Users --> Purge User Sessions; this is a problem, because we have configured max session per user how can avoid this problem? is there any new configuration to implement into asa?
we need to configure max session per user, but there is only a global option applyed to all users.how can we configure user accounting? we need to know how long a user is connected via vpn session.
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Aug 12, 2012
I am adding a second external connection to an existing system on an ASA 5510 with ASA V8.2 and ASDM 6.4. I added the new WAN using an other interface (newwan).
The intention is to route most internet traffic over the new route/interface (newwan) but keep our existing VPNs using the former interface (outside).
I used the ASDM GUI to make the changes and most of it works.ie. The default route goes via (newwan). Outgoing VPNs of a site to site nature use the previous route via (outside) as they now have static routes to achieve this.
The only problem is that incomming Remote Access Anyconnect VPNs are not working. I set the default static route to use the new interface (newwan) and the default tunneled route to be via (outside) but this is the point is goes wrong....
I can no longer ping the outside IP address from an external location. It seems the outside interface does not send traffic back to the - outside interface (or at least that's where I think the problem lies). How do I force replies to the incomming VPN remote traffic from unknown IPs to go back out on the outside interface?
The only change I need to make to get everything working on the outside interface again is to make the Default Static route use the outside interface. Which puts all the internet traffic back on the original (outside) connection.
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Jul 1, 2011
I need to know how to setup my ASA with dual wan links. 1 is 10/10 fiber, other will be a 50/5 Cable Wideband link. The 10/10 fiber is currnetly being used for VPN's and Internet, (about 20 point to point IPSEC vpn's currently).
I want to add the Wideband link and use the "Tunneled (Default gateway for VPN traffic)", feature for the current fiber link and the new Wideband link for any other internet traffice. I tried this however as soon as I set my fiber link to "Tunneled (Default gateway for VPN traffic), I lost all connectivity.
I also setup my "VPN" link with the "tunneled" option and my "INTERNET" link with a default route to the internet. This would only let me ping internet sites from the ASA device but not from client computers, also the VPN's would not come backup.
I have tried the sla setting with a DSL line for failover and that works good, i've since got rid of the DSL and want to utilize 2 wan links for different purposes/traffic.
ASA 5510, SSM-10 1GB RAM
ASA version 8.4(1)
ASDM Version 6.4(3)
Context Mode Single
FW Mode Routed
License Security Plus
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Jul 4, 2012
We are in the process of switching our infrastructure of our routing/firewalls/vpns over to cisco. We are switching our first location and one of the issues I'm struggling with is windows authentication pass-through for internally hosted web pages. Meaning, user inside our network has the 2921 as their default gateway, they try to access a web page that is hosted on the internal network but is secured with windows authentication. In the past, because they are logged into the domain internally, the website authenticates and loads. After switching to the Cisco, it asks for a password even though they are logged in.
Because its the web server that actually authenticates I'm not sure why the router isn't allowing that to happen, but I can't think of anything else that could be causing this behavior.
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Oct 10, 2012
I have a ASA 5510 at our corporate HQ that has one site to site VPN. I need to add 6 additional site to site VPN's to this ASA for our remote branches. How can I add them without affecting the existing site to site VPN? The 6 site to site VPN's will all have the same settings however these settings are different from the existing site to site that I already have set up. How can I set it up so the 6 additional VPN's use their own crypto map and all use the same settings?
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Aug 25, 2011
If there is a router ISRG2 2900 with SEC license and without HSEC license, there is a limit in count of cumulative encrypted VPN tunnels of 225. Which commands can show us a number of current tunnels on the router, so we can see if we are near this limit of 225?
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Jan 24, 2013
[code] Site-to-site VPNs in place between Site A and Site B and between each site to the DC. Site A and Site B have Cisco 2911 routers, there are ASA’s at the DC. The existing Site-to-site VPNs carry data and voice traffic between the sites (though voice and data is on separate VLANs in separate subnets)
ISP1 currently used for the existing circuits at Sites A and B but we have experienced issues with them recently which has disrupted service. So new circuits are to be installed at each site with ISP2. (See basic diagram attached which shows current set-up with intention to get new circuits via ISP2 installed)
We have 3 ports on our Cisco 2911 routers with 2 ports already in use for the existing connections (1 for the LAN and 1 for the WAN connection to ISP1) Can we simply use the 3rd port for the connection to ISP2 or would it be far more advisable to use a 2nd router (for redundancy, etc)
Would it be feasible to have a set-up where we have e.g. voice traffic go over a site-to-site VPN via ISP1 and data traffic go via site-to-site VPN via ISP2 but each can take over from the other in the event of a failure?
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Oct 11, 2011
I have a network of 5 different ASA 5505 they are all connected via site to site VPNs. 4 of the routers are working fine but the 5th one is only connecting to 2 VPNs when it should be connecting to 4 VPNs. I have verified that all the settings are correct on the routers (peer ip address, PSK, etc...) but the router still only connects to 2 VPNs. Is this a licensing issue? The license of the router in question looks like this: [code]
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Jun 2, 2013
I'm working with a client who has a site to site VPN between the main office and a branch office. The main office is 192.168.200.0/24 and the branch office is 192.168.1.0/24. The issue is when the branch office users use the VPN in they receive a 192.168.200.x address, however, they cannot access a server or any other resources at the branch office.
They have a SSL-VPN 2000 connected to a TZ100 at the main office and a Juniper device at the branch office. I did try setting the Tunnel All mode on the NetExtender but that does not allow me to access the resources at the branch office. Additionally, those users at the main office can access the resources at the branch office without getting on the VPN.
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Sep 23, 2012
I have a 50MB ME circuit at HQ site running a 3925 router and 20MB ME circuits at 2 branch sites running 2951 routers.
I need to reserve 90% of the bandwidth at each site for site-to-site IPSec VPN's and leave the remaining 10% for browsing. I also need to shape the traffic on the outside interface's to match the bandwidth of the particular site. I also want to drop any traffic that is determined to be file sharing.
The routers work fine, the VPN's work fine, traffic shaping seems to be working, but when I generate traffic across the VPN and do "sh policy-map interface Gi0/1 output" all traffic is falling into the default class, nothing is getting classified as IPSec.
My class maps, policy maps, and outside interface config is attached. Can some tell me why my ISec VPN traffic is not being recognized as such?
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