Cisco VPN :: 2800 - EzVPN And DmVPN On Same Router / Interface
Jan 20, 2012
I have setup DMVPN and EAZYVPN on one router. Tunnel interface on Spoke one and Spoke two are up/up and show crypto ISakmp sa shows both tunnels are in idle. However, tunnel to Spoke one(10.10.1.1) keep bouncing on and off(see below). Every 30 sec or so, the tunnel gone back to IKE phase while tunnel for spoke two(5.5.5.1) still leave active. THe configuration on the HUB side is the same for both spoke!! show crypto ipsec sec shows both side has the same life time(IOS default). Could that be an IOS debug on the spoke one?
Hub :
Cisco IOS Software, 2800 Software (C2800NM-ADVIPSERVICESK9-M), Version 15.1(3)T2, RELEASE SOFTWARE (fc1)
HUB#sh crypto ipsec security-association
Security association lifetime: 4608000 kilobytes/3600 seconds
Spoke one:
Cisco IOS Software, C2600 Software (C2600-ADVSECURITYK9-M), Version 12.4(8), RELEASE SOFTWARE (fc1)
[code]....
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May 26, 2011
I'm looking to configure a DMVPN spoke with a Site to Site VPN Connection to a different destination than the DMVPN. I'm using a Cisco 2800 router. When I add the crytpo map to the outside interface for the Site to Site VPN. The DMVPN drops. Is there something I could be missing? The Tunnel interface for the DMVPN has the shared optioin applied to the tunnel protect ipsec profile.
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Jan 14, 2013
I have lots of 857's routers in the field with mostly the latest OS - 12.4(15)T17 making ezVPN connections to a 2951 with 15.1(4)M5.All the 857's have lookback and vlan interfaces similar to :
interface Loopback0
ip address 50.43.8.1 255.255.255.255
ip tcp adjust-mss 1452
end
[code]....
Now lately for some or other reason we have instances where I can ping either the VLAN or the LOOPBACK interface, but not both. Or I have instances where the 2951 can ping all the interfaces on the 857, but the 857 can not ping the 2951. Or I have instances where the 2951 can not ping the 857, but the 857 can ping the 2951.The way I have been fixing this is either to add crypto ipsec client ezvpn SMS_VPN inside to the loopback interface, or if it is there already to remove it. This usually works for a few days, but then suddenly I have to reverse this again. If that does not work then I usually do lots of clear crypt sess and/or clear crypt ipsec client ezvpn on the 857, or clear crypt sess remote 857_ip_address from the 2951 and then suddenly it starts working again.
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Oct 25, 2012
I have a pair of router Cisco 2800 running in HSRP, now I want to configure one sub interface with another sub net, Will my current IP on physical interface work or do I need to create two Sub interfaces for each network. Do i must need encapsulation on sub interface
Current Config:-
Router 1:-
interface FastEthernet0/1description Connect to LAN_SW1 Gi1/0/1ip address 192.168.1.13 255.255.255.0no ip redirectsduplex autospeed autostandby 1 ip 192.168.1.1standby 1 priority 90standby 1 preempt
Router 2:-
interface FastEthernet0/1description Connect to LAN_SW2 Gi1/0/1ip address 192.168.1.3 255.255.255.0no ip redirectsduplex autospeed autostandby 1 ip 192.168.1.1standby 1 priority 110standby 1 preempt
For second network I do not require HSRP
Router 1:-
interface FastEthernet0/0description Connect to LAN_SW1 Gi1/0/1no ip addressduplex fullspeed 100
[ code]...
Router 2:-
interface FastEthernet0/0description Connect to LAN_SW2 Gi1/0/1no ip addressduplex fullspeed 100
[Code]...
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Jun 30, 2011
If you have a headsite with multiple EZVPN clients (PIX 501 & 515) connected in a star configuration can you have one remote site connect to another remote site using the intra-interface command and modifying the encryption domain on the EZVPN Server?
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Jul 4, 2011
I have applied a crypto map (fo ipsec vpn) on the dialer interface (for PPoE connection) in Cisco 2800; every time when the router restarts the crypto map is removed from the dialer interface even though i save the configuration every tim when i apply the map on the interface. Is there any way that the crypto map remains there on the dialer interface after the restart of router.
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Feb 26, 2012
I'm trying to find out what is the minimum downtime for a Cisco 2800 series LAN interface configured as DHCP client, in order to initiate a new DHCP discover. How much time does it need to take for the Cisco to "sense" the phy disconnection ?
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May 28, 2012
I'm trying to add some 2800 series routers to our monitoring environment, but I can't get them discovered.
On the Mgmt Server I need to go through a "discovery" process to add the 2800 to the system. For this I target the internal interface ( i) but the discovery fails. I'm assuming the packets are getting dropped on the outside interface (e). I know SNMP is set up correctly and works as I had PRTG installed on a local box (p) for testing purposes.
The intention is to do the data gathering via a proxy agent (p), so enableing SNMP on the outside interface is not going to do me any good.What do I need to do to let those discovery packets pass through? At least temporarily?
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Jan 12, 2011
It is a single router with dual ISPs. It is a 2800 and there is failover configured. I have implemented object tracking and the feature works great except that lately, whenever there is a lot of traffic coming perhaps from the internal users, we start getting intermittent outages.
I have gone deep into looking into this problem and have determined that our ISP#1 does not have any problems. What I think is happening is that whenever the router receives a lot of packets (30-40 users on the internal network) destined to the outside, the router CPU maybe gets too busy and the router then believes that the objects are no longer reachable and it triggers a failover which causes the router to re-direct traffic to the ISP#2. Then, because these are just quick burst of traffic, in the next 30 to 45 seconds after the router re-directed the traffic to ISP#2, the router object tracking engine detects that the objects are now again reachable and this then causes the router to re-direct all traffic back to ISP#1.
This cycle then continues all day on how to prevent this.
Is there a way to perhaps tell the router to completely shut down the interface facing ISP#1 whenever there is a hicup and to keep it shutdown for at least 8 hours? This way I can prevent the router from going crazy.
Or is there a way to perhaps prevent this at the internal (LAN) interface? Are there some metrics like QoS that I can implement on the internal Fast Ethernet Interface to prevent the burst of traffic from eating up the CPU?
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Nov 24, 2011
There use to be Cisco 851 routers, but lately these routers are replaced with Cisco 861-K9 routers, and these 861 routers doesn't support DMVPN, instead 851 use to be.
Is there any license file we can upload in 861 router for DMVPN capability, if yes may i know the SKU # for that. We have some customers having 6-7 locations and they are planning to have 2 more locations, we implement already DMVPN in there network, if we go with the 87X or 88X router there price is almost double the price of 861.
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Jun 27, 2011
I am trying to spec out some routers for a small DMVPN network.I was thinking 2801's for my hub routers.will these run DMVPN out of the box or do they need additional hardware modules?according to the below linkyou need a "AIM-VPN/SSL-2" module in order for it to work, but then according to"The Cisco 2800 Series supports IPSec Digital Encryption Standard (DES), Triple DES (3DES), Advanced Encryption Standard (AES) 128, AES 192, and AES 256 cryptology without consuming an AIM slot."
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Sep 10, 2012
What router would you choose to setup 1500 dmvpn tunnels (mGRE/ipsec)? so this router will be my hub and the hub will have 1500 tunnels.this router with this many tunnels will have to be able to provide excellent service to all spokes/tunnels.the spokes will mainly use the tunnels for business, transfering small files and some email I would say they may transfer 500megabyte of data per day but that's the absolute maximum.
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Apr 15, 2013
Trying to setup a DMVPN on out existing equipment that is currently running all point to point vpn connections. basicly its not working. my best guess is something with the config is interfering but i'm not sure the remote router (881) is always comming back with MM_NO_STATE and the main router(2901) is either MM_NO_STATE or MM_SETUP.
I added the config for the 881, 2901 and a debug crypto isakmp and debug crypto ipsec from both routers. I have verified the Keys are correct and it is not blocking port 500. if i issue a sh crypto isakmp policy they are the same on both routers. if you need me to post anything else i will, one note i removed the configs that were part of the point to point tunnls on the 2901 router.
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Jun 21, 2012
I configured dmvpn at cisco router 2900. one hub router and 3 spokes. all of them are working normally but tomorrow i see one error at at one spoke router.
error:
Maximum Tx Bandwidth limit of 85000 Kbps reached for Crypto functionality with securityk9 technology package license
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Nov 15, 2011
I configured a 2811 series router for dmvpn. My two tunnels are up but one of the tunnel is flapping with this message.
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Jan 8, 2013
My customer is looking at using routers in DMVPN remote locations as DNS servers. He would like to be able to estimate how much memory the DNS cache will consume before going into production. I know you can get cache information when it's running, but he wants to plan ahead.I couldn't find any reports in Cisco or on the web of DNS caching causing memory issues, so I don't think he has much to worry about, but any rule of thumb as to how much memory each cache entry consumes would be useful. Or is there a protection mechanism to limit cache memory size in IOS ? The routers will be 877s and/or 1900-series.
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May 15, 2013
We are facing network heavy and slow performance at one of our remote site, we are using Cisco2800 series router with same IOS on either of the sites.Our WAN network is running on BGP with EIGRP configured and tunnels were configured on either of the sites. As part of the testing I have removed the tunnel to see the performance was ok from Head office to remote branch and the WAN network is getting heavy and slow down when we put the tunnel back in hub and spoke.
quick info
Cisco 2800 Series router
IOS: (C2800NM-ADVIPSERVICESK9-M), Version 12.4(15)T1, RELEASE SOFTWARE
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Jul 24, 2012
I try to set up EZVPN server. I cannot get any response from server.
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Aug 23, 2011
I'm trying to configure a router 7606S with SPA-IPSEC-2G for EzVPN.I was reading some examples in SPa and 7606 documentation but with the current configuration in our router I don't know how to do it.
The router has the SPA installed in slot 3, interfaces G3/0/0 and G3/0/1. The router has the interface G2/0/0 connected to our provider, and we have the interfaces connected directly to network; ie: not vlans, no trunks, ports configured as IP ports conected directly to network.Where can I find an EzVPN example configuration ?
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Nov 1, 2012
I'm having trouble configuring with EZVPN on ASA5510. EZVPN uses the local LAN as the source IP, now since the EZVPN is configured on the ASA, it will use its local port 2.2.2.1 as the source local LAN. The actual local network is behind a firewall and i need the tunnel to extend to the 10.10.10.10 network. Is there a way to extend the tunnel to use the 10.10.10.10 as the source LAN? How to do it via the GUI?
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Nov 24, 2011
Cisco ASA 5505 50-User Bundle includes 8-port Fast Ethernet switch, 10 IPsec VPN peers, 2 Premium VPN peers, 3DES/AES license
ASA5505-50-BUN-K9. Cisco ASA 5505 Unlimited-User Bundle includes 8-port Fast Ethernet switch, 10 IPsec VPN peers, 2 Premium VPN peers, 3DES/AES license ASA5505-UL-BUN-K9
I think they will support ezvpn, just need confirm .
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Mar 31, 2011
I am having an issue get an EZVPN working between a 2811 server and a SR520 client. The symptoms are the SR520 makes multiple connection attempts to the 2811. It appears that sometimes these connections are successful and the SR520 is assigned an IP address but then the tunnel will be dropped and a new session will be started. I've attached scrubed configs for both the 2811 and the SR520. One other note, when connecting to the 2811 with a software VPN client, there are no problems, so I think the problem is with the SR520. On the other hand, the SR520 wasn't having any problems until we switched our VPN server from a UC520 to the 2811.
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Jul 10, 2011
I have a 3825 configured as an EZVPN server with 881 routers as clients. One issue I am seeing is that sessions don't seem to time out, such as when a peer's public IP changes. Show crypto ISAKMP peer shows the same host (using device certificates for authentication) with multiple public IPs establishing sessions. I have ISAKMP keepalives configured on the router.
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Mar 29, 2011
Our company has a handful of sites that use the EasyVPN technology.On my remote router (Cisco1841) - I add the crypto inside to the FA0/0 and the Loopback0 interface.On the other end my Cisco ASA 5580 - 8.41 code - I have RRI enabled and the tunnel comes up fine.However I only see the static route from the fa0/0 interface on the remote router. I can not figure why I can not see the Loopback0 address?Wondering if this is a limitation or feature not enabled.
I added multiple interfaces on the Cisco 1800 and can see the networks.I run "show crypto ipsec sa" on the Cisco ASA and see the spi encaps/decaps for the loopback, but the SH ROUTE does not show the static route being injected.
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Mar 14, 2012
We have a VPN using 857 and 877 routers as remote connecting in to a 2800 EZVPN Server.
The VPN is working fine. However, the VPN connections sometimes (after a few hours/days) seem to "freeze". A "show crypt sess" shows the connections as Up/Active, but you can not ping antyhing from remote to server, or visa versa, nor does any traffic flow. I then added a "isakmp keep-alive" on the 2800, which improved the situation a bit, but not as much as I hoped.
On the 877 I then implemented a IP SLA, with Object Tracking and then use a Event Manager to just issue a "clear crypto session" . This solved the problem.
However, what do I do on the 857 ? It does not support Object Tracking or the Event Manager. Is there any other mechanism to monitor and reset these frozen/stale VPN connections automatically ?
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Feb 2, 2012
I try to configure a simple EzVPN infrastructure:
EzVPN Server (CISCO2811, hostname cme) < -- > EzVPN Remote (ASA5505, hostname ezvpn-asa) < -- > Client
Attached you find both configuration of the EzVPN server and remote. The tunnel is getting up and if I ping from the ASA to the Router, I see the packets getting encrypted:
ezvpn-asa# ping 172.16.100.1
...
ezvpn-asa# show crypto ipsec sa
interface: outside
Crypto map tag: _vpnc_cm, seq num: 10, local addr: 172.16.100.2
[code]....
If I connect a client with IP address 192.168.1.2 to the interface eth0/1 and do a ping to the cme, I don't see any packets getting encrypted. I don't have any idea about VPN, I just need it for a wireless lab environment. What do I have to configure on the ASA, so the inside traffic is encrypted?
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Apr 2, 2013
configured 2 EzVPN groups using a 2811 router, i am trying to do this but is not working i have another VPN working thru EzVPN but if i try to configure another group for another EzVPN client is not working and the problem is that the debug crypto isakmp say that Apr 3 08:45:25.802: ISAKMP:(1309): phase 2 SA policy not acceptable!
How is that possible? in my understand the EzVPN server will inject the the IKE (phase 1) and IPSec (Phase 2) parameters for the client and that's they dont need to negotiate nothing, is important to say that the EzVPN client is an ASA5505 with onlu DES encryption enabled, 3DES and AES are not available due to licensing reasons.
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May 14, 2013
i hace a VPN configured between two Cisco ASAs, but I have a problem to reach a network behind a router 2800.
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Feb 16, 2011
I'm trying to advertise the branch LAN subnets via OSPF back to our core.I can create the OSPF adjacency and the ASA is learning routes fine. However it does not appear to be pushing the branch LAN subnets to the connected router. show ospf database reveals they're not in the OSPF database.Here is my routing config, the branches are 10.114.0.0 /16.As an aside, why I need the statics below, they appear to be necessary to reach my LAN subnets behind the EZVPN spoke sites. I would have thought the ASA would learn it automatically as I'm running network-extension mode on the spokes. [code]
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Mar 18, 2011
configured Ezvpn Server/client with client mode configuration on IOS router with ver advipservicesk9-mz.124-15.T3.bin of ISR 1841 routers. Only my main issue is that once the tunnel is up I cant access the server side local LAN. However I could each site my icmp traffic is encrypt or decrypt but not both at the same time. However I can ping from the server to the client ip address which is assigned by the pool (int loopback10000)
Also once the tunnel is up I could also see there's static route towards the client side via virtual-access interface and also static route on client side. I have already configure SPLIT ACL on server side allowing the required network access.Attached is the configuration of both server and client with all required show output.
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Sep 24, 2012
I've got some ASA5505 which run as EzVPN clients in NEM, connecting to a ASA5510 as head-end. The ASAs are configured with a CSM and AUS. But whenever they are getting a new configuration through the AUS they stop trying to establish an EzVPN connection to the head-end. After a "reload" they run with the new configuration and establish the tunnel as expected.
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Aug 9, 2011
I am attempting to get a solid setup for a remote office we have going up and I am running into little issues that I cant seem to get around.
Basically, we have a remote office that will have dual ISPs, one hard wired circuit from a local carrier and the other will be a Verizon 4G router that plugs in via Ethernet and hands out DHCP to my Cisco router.The Cisco router is a 2911 with IP SLA configured. I have it setup to ping my DC out one interface and if that fails, it removes the default route and injects a new default route from the other ISP,
The problem I am having is with the VPN. I figured using EZVPN would be the only solution because the Verizon 4G only supports DHCP so I have to be able to connect from a dynamic remote host. The other caveat is that failover needs to be seamless as we have no person onsite that can troubleshoot. Its fine if it takes a few minutes, but the VPN just needs to come back up on its own without any intervention.
I attempted to setup two different EZVPN crypto maps on the router but realized you can only have one inside cryptomap per interface, which would cause a problem with the internal network. I thought I could just create subinterfaces off the router to have two inside interfaces to work with but that wouldnt have supported because they would now be on different subnets.
I decided that adding an ASA5505 behind the router may be the simplest solution. Use the router only for the purpose of handling routing between the two ISPs and performing NAT out the interfaces. Then use the ASA to do EZVPN from. This works well but there are some issues I am trying to work through.
First, when the ISP fails over to the backup, the NAT translations have to timeout before things start working again. For a constant ping, this is fine, I have the timers set down to 15 seconds for NAT timeouts and after 15 seconds the ping picks right back up again. However, this breaks the EZVPN. The ASA keeps trying to bring up the ISAKMP nearly every second, which keeps resetting the countdown on the NAT timeout for the remote EZVPN server. Because of this, the VPN will never come up until I manually clear the NAT translations on the router. So my first question is this; is there a way to adjust the timer that the VPN uses to try to bring the tunnel up? I tried the crypto isakmp keepalive command but that didnt work, it looks like it doesnt work with EZVPN.
The second issue is really with the IP SLA and is only an issue because of the first issue I mentioned. When the router first comes up after a reboot, both the primary and secondary interfaces come up. However, since the primary default route is only injected into the routing table once IP SLA is up and can reach its destination, the secondary route gets injected initially and the VPN comes up over the secondary ISP. In a few seconds, the primary default route is injected, changes the path and because of the NAT translation, breaks the tunnel and never comes up again because of the first issue with the VPN tunnel renewing the NAT translation continuously.
I could easily go out and purchase a $100 Linksys router that will do the failover and clear its NATs and everything, but I need better reliability out of the hardware than that. There has got to be a way to do this on a Cisco device since consumer level equipment can.
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Jun 27, 2012
I have ezVPN configured on an ASA 5520 for my server with 5505s as my clients at several remote sites. The tunnels come up no problem and I can hit everything I need to on both sides of the tunnel, but I'm not able to get to another remote network from a remote network. The traffic goes out the tunnel on the 5505 but on the 5520 all I see is a bunch of scrolling tear down messages.
[code]....
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