Is 3DES on ISAKMP considered to be secured for your average site (other options are AES/DES)? I'd imagine AES should be much stronger but what about DES, is that considered adequate or broken? Is there any proof of concept attack against 3DES on ISAKMP (or ISAKMP in general)?
View 2 RepliesI've some VPN encryption method questions.Is it recommended to use different encryption algorithms for both VPN phases (phase 1 and phase 2)?I’ve read once that it is much secure to use different encryption algorithms for each phase.In my opinion, I would go for the AES256 algorithm in both phases. But maybe it is a better idea to use AES128 or AES192 in the first phase and AES-256 in the second phase… I don't know.After saying this, I’m also wondering about the best VPN encryption setup for a site-to-site VPN (IKEv2) when using a Cisco ASA like the 5510, 5520 or the 5515.Which encryption method is recommended for phase 1 and phase 2Which PFS / DH-group should be used (considering CPU load and security)
View 2 Replies View RelatedI have to connect one of our it labors with some ec2 instances in amazon vpc. I downloaded a configuration file from amazon which starts with the command
crypto isakmp policy 200
My router tells me that he does not know crypto isakmp.
I searched on the internet and found that i have to install a specific license, but unfortunately i cannot find which license i have to install.
The show license command show following licenses
AdvIpServices active
AdvSecurity active
advsecurity_npe, ios-ips-update, waas_Express no state displayed
ssl_vpn active but eula not accepted
I found that i can accept the eula license with license boot module c880-data technology-package SSL_VPN command
But this command is also not available on my device. getting the crypto isakmp command working?
I have a Cisco 881 ISR (CISCO881-SEC-K9) and have the advanced security license installed and enabled/active and in use (see screenshot). However, the isakmp crypto module is not available.
[code]....
I'm currently dealing with a weird problem on a Cisco RVS4000. I'm trying to connect to a IPSEC VPN Gateway (NETASQ) located on the LAN side of the RVS4000. I'm using Green bow vpn client on the WAN side of the RVS4000. Basically I'm trying to get through the RVS.My VPN config is OK because i tested it on the LAN side of the RVS.
The RVS is configured like this: NO VPN configured.
Block WAN Request :OFF
FIREWALL,IPS,DDOS are OFF
NAT forwarding on for UDP 500 and 4500 directed from the wan to the ip of the VPN gateway. Seems right because iv managed to do this with other routers (different brands) on another site.I've wire sharked my vpn client and i keep getting ICMP destination unreachable (PORT UNREACHABLE) after my ISAKMP launching packet.Can the RVS nat these ports ?
cisco 878 configured to accept client vpn requests. From client prospective people get error 412 and they can't connect. Not sure what s wrong, following configuration and debug isakmp. Autentication is through a radius server.
View 3 Replies View Relatedcrypto map mapName 20 match address NAME_20_cryptomapcrypto map mapName 20 set peer IPADDRcrypto map mapName 20 set transform-set ESP-3DES-SHAcrypto map mapName interface IFNAMEcrypto isakmp identity addresscrypto isakmp enable IFNAMEcrypto isakmp policy 10authentication pre-shareencryption 3deshash md5group 2lifetime 86400crypto isakmp policy 30authentication pre-shareencryption 3deshash shagroup 2lifetime 86400crypto isakmp policy 50authentication pre-shareencryption aeshash shagroup 2lifetime 28800(code)
I need to be sure that when traffic matches access-list "NAME_40_cryptomap" Isakmp policy 50 are used. And then traffic matches "NAME_20_cryptomap" isakmp policy 10 are used. How do i link the crypto map with the specefic isakmp policy?
I upgraded my Cisco asa from 7.2 to 8.4 system image. Now the old style syntax isakmp policy is not working anymore and I am not able to write a isakmp policy to being used for remote access VPN.
on many examples on Cisco site I have seen that it is always used Cisco any connect client installed on ASA. this means that the old configuration compatible with Cisco vpn client IPSEC is no more usable ? or what kind of syntax I have to use to configure remote access VPN ? for example these commands are not working anymore.
hostname(config)# isakmp policy 1 authentication pre-share
hostname(config)# isakmp policy 1 encryption 3des
[code]...
I have a couple of clients which are using the 3g modem to connect to ASA.The channel was sometimes "noisy" and therefore ipsec isakmp is doesn't work.Client losts vpn connection ,but on asa i can see it as connected(connection was in "freeze" state).
It's look like this :
[code]...
Just looking at a new clients setup and they have a ISAKMP vpn to the old security company I am trying to remove...I am fairly new to cisco, I actually know how to setup the ISAKMP policies, acl's etc but never had to completely remove one before All I can find is Clear Commands which seem to just flush the config not actually delete any of the policy etc...Its not that urgent as all passwords are changed on the domain and the cisco, the usernames have been deleted as well.
#show crypto isakmp peers
Peer: ** Port: 500 Local: **
Phase1 id: **
#show crypto isakmp policy
Global IKE policy
[code]...
We have a PIX firewall 515E running version 6.3(4) and there are few site to site VPN's installed on it. We want to find out the isakmp key for those VPN tunnels. On ASA, We can run the command "more system..." and it displays the key, but it seems it doesn't work on the PIX 515E.
View 1 Replies View RelatedI am currently experiencing an issue with an IPSEC Tunnel between a Cisco892-K9 (c890-universalk9-mz.124-22.YB.bin / Feature: advipservices) and a Checkpoint VSX R67.
After reloading the router the tunnel is stable, but afterwards we loose the connection to the LAN unexpectidly (max. time of the connexion is ~2h30).
In fact after a reload the first ISAKMP SA is well negotiated with conn-id 2001 and after a certain amout of time the connexion is lost always associated with this debug message =>
ISAKMP:(2001):error from epa_ikmp_gen_ipsec (QM_IDLE )
ISAKMP:(2001):Unable to generate IPsec key for 799280698!
ISAKMP:(2001):deleting SA reason "Death by retransmission P2" state (I) QM_IDLE (peer 194.X.X.X)
and so on ....
We supposed it was related to DPD messages so we deactivated the keepalive (no crypto isakp keepalive). We tried to play also with the ACL matching the crypto map (currently from local subnets to any), but still no luck.
When it is stable the ‘show crypto isakmp sa’ indicates a isakmp sa ‘QM_IDLE / ACTIVE), and when the problem occurs the active ISAKMP SA is deleted and recreated (in ACTIVE state) continuously : conn-id 2001, 2002, 2003, 2004 etc...…but still no access to the LAN.
My main question is to know if someone has already know the signification of the previous ISAKMP debug messages (along with the total debug message + crypto conf from the beginning of the problem) =>May it be a platform support (near 200 ipsec flow in use => most subnet to subnet flow, few subnet to host flows- 200 users on site) , compatiblity, crypto map acl …???
I am trying to set up a site to site VPN tunnel using GRE over IPSEC. Below is the configuration from both routers and debug output. I'm scratching my head on this one. I'm using two Cisco 7600 routers with SSC-400 SPA modules and 720 Supervisors. The IOS on R1 is 12.2 SXI2 and R2 has 12.2 SXI3.
View 1 Replies View RelatedI have setup ipsec VPN in my C2811 router but when "show crypto isakmp/ipsec sa" shows nothing. Remote end point is an "ASA5520". Does it indicates that the remote ASA5520 not yet configured?
Code...
My company recently failed a PCI scan because our router was returning 56bit des encryption for isakmp negotiation on an existing default isakmp policy. How do I remove this default isakmp policy. I am not running 12.4(15)T1 so the no crypto isakmp policy default does not work. Is there any way other than upgrading the IOS?
Is there any way to configure a maximum number of isakmp policies that an authenticating router will check? I have 2 configured higher priority ISAKMP policies. Maybe if there is a command to limit the number of isakmp policies the router checks, that would eliminate this default policy being matched?
I'm running a IPSec VPN between a 5520 ASA and a 2811 router. The ASA has a static IP and the router has a DHCP interface.The VPN seems to work fine once I get done clearing old SAs, but each new IPSEC SA creates a new ISAKMP SA on the router? There are multiple subnets that need to create multiple IPSEC SAs. Eventually I can clear the older ISAKMP SAs and get all the traffic on one ISAKMP SA, but until I clear older SAs, new associations won't form. Why the router (initiator) would keep creating new ISAKMP SAs and not use an established one? Using PSK, aggressive mode and no PFS. ASA has another dynamic crypto map with lower priority than this one. Using FQDN for identity on the router. ASA version 8.2(5) and IOS is 12.4(20)T1.
Must be something I'm not understanding. The ASA says no established SA and drops the new SA attempt until I clear older ISAKMP SAs out of the router. Interesting, the first few IPSec SAs form when the tunnel initially comes up. I assume the initial requests are getting cached and work immediately after the first ISAKMP SA forms, but subsequent IPSec SA attempts will fail. Once all subnets are talking with 1 ISAKMP SA, rekeys don't cause any problems. Since the router subnets have to instantiate the new IPSec SAs, this is a real pain to go through anytime the WAN/VPN fails.
I have been looking around and I can not find the " crypto isakmp policy " command on this Cisco Router 1941. I just wanted to setup a regular IPSEC Lan to Lan tunnel and surprise, the command is not there. Do I have the wrong IOS? I thought that a K9 image would do the trick. [code]
View 2 Replies View Relatedi repalced old cisco router 2811 with new one 2921 , all works except crypto map VPNs routers can ping each other , ACLs are not applied to outbound interfaces show crypto isakmp sa is empty after i make same configuration on a new router 2921 config crypto isakmp policy 10
hash md5
authentication pre-share
crypto isakmp key key address Y.Y.Y.Y no-xauth
[code]...
keys match , crypto isakmp policy is same , IOSs supoort VPN .interess traffic alse been initiated from both side and all worker in old cisco router with same configuration?
I have recently upgraded my company's network significantly, and in the process removed our Cisco edge routers and firewalls (gasp!), and replaced them with another vendor who gave a better price point for the router.However, i was only able to get ONE edge router, whereas before I had two, so I want to recycle one of my old 2921's as a cold standby (in case the brown sticky stuff hits the rotating air distribution blades, and $other-vendor router dies).Trouble is, the 2921 does not, I believe, have sufficient system resources to take the full routing table we're getting from our two ISP's.What I would like to ask is people's thoughts on the best method for me to configure the BGP setup on the 2921 to do the following:
-Accept the default route from each ISP and discard *everything* else in the route table
-Modify our advertisement (ad prepend) out the "secondary" ISP to reduce the priority of traffic coming in over this link.
-Configure the OUTBOUND priorities so that the "primary" link is used by preference for outgoing traffic (which will effectively shut down the secondary link for outbound traffic
As we know SNR (signal to noise ratio) is very important in communication special in wireless. So I wondering : How is SNR measured (by using practical method)?
View 2 Replies View Relatedwe currently have 4x ACS 4.1 (1) build 23 windows based and we are going to migrate to ACS 5.2 appliance 11211.the first pair we are using simply local authentication for multiple vendor firewall and routers, with one custom radius vendor-specific attributes, with now she exec.the second pair we are using for wireless clients authentication through AD, with dynamic mapping.
in order to migrate what would be the most suitable migration, whether to use Migration utility or export those ACS objects and import them into the new ACS 5.2.
We have a scheduled office move where we are consolidating 2 remote offices into one. I’ve been asked to spec out the correct size UPS to support all of the network equipment for this new office.I went to the Cisco website and I see on the datasheet for the switches and router where they talk about the wattages and BTU’s but how can I go about deciphering from that information what my total wattage and BTU will be for each switch and router?What numbers should I be looking at? For instance, we have 3 3750 48 port PoE switches. So if I look at the datasheet for that switch they have 4 different columns, one for 100% throughput power consumption, one for 5% throughput, another one for 100% throughput for max PoE load and one for 5% throughput with 50% PoE loads?Is there a common method for deremining UPS requipments? For the switches I pretty sure I need to assume max PoE load in the event every port has a phone plugged into each port.
View 3 Replies View RelatedI am having some issues with my internet connection. release and renew method and using Google's DNS server.
is there any method to control an access to the different WLAN(PEAP) on the same ACS 5.2 and WLC?That is, there is two AD groups the one have access to domain network only the other group have access to internet only and may be third group that have access to both networks.Currently if i add new authorization policy the user will have access to both networks.
View 1 Replies View RelatedAny instructions to configure an ASA to allow authentication by certificate only on an AnyConnect vpn?I'm running an ASA 5505 with 8.4(1) and AnyConnect 2.4.7030 on an Android phone.I currently have the AnyConnect client connecting ok using username / password for authentication.
I have loaded the company root certificate (internally generated) into the ASA "CA Certificates" and generated an Identity Certificate for the ASA.
I am a network tech at a local school district (easily enterprise network). I am just a worker bee, so have no say in the design of the networks. Our topo at a site goes WAN rtr---LAN rtr (6500 of 3550)----distro switches----access switches.
Now at most of our sites we use Extreme, which has a handy feature called ELRP Extreme Loop Recovery Protocol, despite the name, this mechanism just detects loops, in the logs we can see, ok...off the LAN rtr, port 2, then on port 2 we see whats hanging off it...ok, loop off port 5 of that switch.....and work your way down the room.
We do not have STP on our network (dont ask) and yes, logging is not set to standards also......what is the best way to detect loops? Commonly these loops come from classrooms that have mini-sw's that are looped onto themselves or a wall jack connected to mini sw and that mini sw then connected to another wall drop going back to same sw. Sometimes I disable all ports minus the WAN uplink on the LAN router, then enabled ports one by one while having a LR hooked up to a user facing rj45 port on the 6500 and when the LR (link runner) shows 100% util, I know that port is now suspect.
what is the easiest method permitting a local and a remote pc to access the same database ? They both have internet access.
View 3 Replies View RelatedI've got a weird problem that I can't figure out. I've de-authorized the switch in the RADIUS server to force an ERROR status to test the backup entries in the AAA authentication method list. However, after I do that and try to log in (through ssh), it just prompts me for my username's password and not the enable password. Here's the debug output:
1d02h: RADIUS: Marking server xxx.xxx.xxx.xxx:1812,1813 dead
1d02h: RADIUS: Tried all servers.
1d02h: RADIUS: No valid server found. Trying any viable server
1d02h: RADIUS: Tried all servers.
1d02h: RADIUS: No response for id 10
[code]...
I have been successfully able to setup Cisco AnyConnect VPN on ASA 5520 with 8.4 code. I have set it to authenticate against the RADIUS Server (Microsoft Windows 2008 NPS server). I have noticed one thing, on the server under "Constraints and Authentication Method". I picked MS-CHAP-v2, but it is considered Less secure authentication methods. I can click on Add and choose other Authentication methods like Smart Card or other Certificate, PEAP, EAP-MSCHAP v2. I picked PEAP but then the VPN does not work.
So first of all does it really matter if I just leave it to MS-CHAP-v2? Because from my understanding is that AnyConnect will authenticate to ASA and then ASA in the backend talks to the RADIUS server so from a security stand point this scenario shouldn't it be sufficient as no un encrypted or less secure information is available to the outside world? Secondly is there any documentation on using PEAP with Cisco AnyConnect?
I need to move our (secondary instance, version 5-2) ACS server to a different server rack and I have not been able to find a gentle way to shut down the appliance (not the windows version). Does one exist or is it just the power button/cord?
View 2 Replies View RelatedWe have WCS and several WLCs (WISMv1, 5508, 4402) all running the 7.0.240.0 code. The "Guest" SSID is "garden-walled" from the corp LANs. We used to have web-auth page that required ID / PW. This became unreasonable as IT Dept was getting requests at all hours for immediate access from guest / resident family memebrs. So we changed the web-auth to remove the the ID / PW and just display corp policy and have to hit a "continue" button to gain access to Guest SSID. Healthcare staff on the floor are not tech-savvy enough to want to use or perform Hotel Ambassador functions.The issue now is that we have employees with smartphones, tablets and even personal laptops conecting the Guest SSID. Sr. Mgt wants to find a way to stop the abuse.I do not believe there is any perfect solution to prevent employees from gaining access, but have been asked to find a manageable method to deter most employees from connecting to the Guest network. Looked at seing up MAC filtering in WCS, it seems that you have to enter MACs that you *allow* on to the network - by default, other MACs are blocked. I would rather have the template block the MACs listed in the csv file and allow access as the default.. We have several SSIDs. Our corporate SSID uses 802.1x and we use Microsoft Server 2012 Network Policy Server (RADIUS) to pass user ID / PW to our AD for authentication. We do not have Cisco ACS. I am not sure if integrating RADIUS is the answer here either. I have had some webex sessions on ISE, NCS, and Prime infrastructure. We are only interested at the moment to monitor / control access to Guest. I have been told that ISE will have "sponsorship" functionality added in soon -- where user fills out info and ID / PW is sent via text or email to a cell phone or other device.
View 2 Replies View RelatedWe have cisco wireless network throught the whole 8-floor building on Cisco WLC 4402 and Cisco LAP-1242 AP. There are no coverage holes, but sometimes clients are flapping between two access points at different floors with serious loss in throughput. Is there any method to limit roaming between different floors in the building?
View 7 Replies View RelatedHow Can i Connect two switches 4505 using the trunking method,…
View 1 Replies View Related