Cisco VPN :: How To Establish IPsec Tunnel Using DNS With ASA 5505
Aug 22, 2011
I´m getting a dynamic public IP from my provider and what I´m trying to do is to establish a remote vpn tunnnel using IPSec which I achieve but every time the sessions resets or the ASA 5505 resets I get a new public IP and I need to put the new IP on the remote client so I can establish the vpn... How can I establish an ipsec vpn using DNS? For this scenario the remote vpn client is a vpn phone but it could be for any vpn client.
Private IP Public IP Private IP
PBX ---- (LAN) ---- ASA 5505 ---( Internet ) --- Remote Site ( Router ) --- (LAN) -- VPN Phone
I have a client that needs to establish a IPsec tunnel to a large organization. They will not forward any traffic to an IP using private reserved IPs. However I am not finding another way to accomplish this. I tried ipsec to the router and using a second IP to a 1:1 Nat but it will not pass the traffic and would seem really insecure from the public internet. 1:1 Nat does work from the public internet but not over the tunnel.I have an RV042 a /29 block of IPs. I am at a loss of how I can accomplish what they want without allowing a private IP.
i'm triyng to establish a vpn ipsec tunnel between my cisco2801 and a cyberoam equipment, at the end point.Debugging isakmp, i have this output, where xxx.xxx.xxx.xxx is the remote peer address, and yyy.yyy.yyy.yyy is mine.What can i try?
Apr 1 14:48:12.542: ISAKMP:(0): SA request profile is (NULL)Apr 1 14:48:12.542: ISAKMP: Created a peer struct for xxx.xxx.xxx.xxx, peer port 500Apr 1 14:48:12.542: ISAKMP: New peer created peer = 0x661C2D4C peer_handle = 0x80000003Apr 1 14:48:12.542: ISAKMP: Locking peer struct 0x661C2D4C, refcount 1 for isakmp_initiatorApr 1 14:48:12.542: ISAKMP: local port 500, remote port 500Apr 1 14:48:12.542: ISAKMP: set new node 0 to QM_IDLE Apr 1 14:48:12.542: insert sa successfully sa = 66DF4F5CApr 1 14:48:12.542: ISAKMP:(0):Can not start Aggressive mode, trying Main mode.Apr 1 14:48:12.542: ISAKMP:(0):found peer pre-shared key matching xxx.xxx.xxx.xxxApr 1 14:48:12.542: ISAKMP:(0): constructed NAT-T vendor-07 IDApr
We have configured a site to site tunnel from our ASA to another organizations Cisco 3030. It appears to have just one way initiation. We can do a ping to a device on the remote site and it will ping just fine. however, when the tunnel needs to be initiated from the remote site, it will not work until we have initiated the tunnel and then everything works.
I continue to see Error processing payload: Payload ID: 1 errors on the ASDM logs.It appears that all the configuration is in place because we can in fact establish the IPSec tunnel unidirectional. And once established, traffic can flow bidirectional.
Last week, I was able to establish a site-to-site VPN tunnel between an ASA 5505 and Cisco C881 router just fine. The tunnel was up and and running for a number of days but today the tunnel is no longer up. I was wondering how, if there are any commands to re-establish or re-initiate the tunnel.
I have a site to site IPSec tunnel setup and operational but periodically the remote site goes down, because of a somewhat reliable internet connection. The only way to get the tunnel to re-establish is to go to the remote site and simply issue a ping from a workstation on the remote network. We were having this same issue with a Cisco PIX 506E but decided to upgrade the hardware and see if that resolve the issue. It ran for well over a year and our assumtions was that the issue was resolved. I was looking in the direction of the security-association lifetime but if we power cycle the unit, I would expect that it would kill the SA but even after power cycling, the VPN does not come up automatically.
I have a Site to Site IPSEC VPN Tunnel created with ASDM wizard.
Cisco ASA-5505 Peer A: x.x.x.x Lan A: 192.168.0.0 255.255.255.0 Fortinet FortiGate-50b Peer B: y.y.y.y Lan B: 192.168.23.0 255.255.255.0
I start traffic from LAN B with a ping (or telnet it doesn't matter) that receive no reply but tunnel goes up fine.
"show isakmp sa" seems ok (says "State : MM_ACTIVE") "show ipsec sa" seems ok but all #pkts are zero
try ftp, telnet from LAN B to LAN A systems but no one work. "show ipsec sa" all #pkts are zero As soon as I generate traffic from LAN A to LAN B these works (with tunnel already up) also traffic from LAN B to LAN A works.Obviously if I end VPN and start tunnel making traffic from LAN A all work fine bidirectionally, LAN A reach LAN B and LAN B reach LAN A.No msg logged in either two appliance.
Seems a very strange problem because seems not related to Phase1 or Phase2 already established.Traffic (routing ?) start works only after at least one packet goes from LAN A to LAN B.No msg logged in either two appliance.Problems begun in ASA version 8.0(4) ASDM version 6.1(3) and remain/continue after upgrade to ASA Version 8.4(1) ASDM version 6.4(1).
I am trying to set up a LAN-to-LAN VPN tunnel between two sites. One site has a 5505, and the other site has a 5510. It looks like the tunnel is being established fine (both ISAKMP and IPSEC SAs look OK), but traffic doesn't appear to be routing across the internet between the devices. [code]
we have a cisco ASA 5505 and are trying to get the following working:
vpn client (ip 192.168.75.5) - connected to Cisco ASA 5505
the client gets a specific route for an internet address (18.104.22.168 255.255.255.255 192.168.75.1 192.168.75.5 100) when i try to access the url from the client i get a syn sent with netstat when i try the packet tracer from the ASA i see the following:
I have weird problem with a Site to site VPN tunnel from a Cisco ASA 5505 to an Clavister Firewall.When I restart the Cisco ASA 5505 the tunnel is up and down,up, down, down, and I get all strange messages when I see if the tunnel is up or down with the syntax: [code]
After a while like 5-10 min the vpn site to site tunnel is up and here is the strange thing happening I have all accesslists and tunnel accesslists right I can only access one remote network (Main site Clavister Firewall) trought the vpn tunnel behind the Cisco ASA 5505, and I have 5 more remote networks that I want to access but only one remote network is working trought the vpn tunnel behind the Cisco ASA. I see that when I do this syntax in ASA: show crypto ipsec sa.They had a Clavister Firewall before on that site before and now they have a Cisco ASA 5505 and all the rules on the main site thats have the big Clavister Firewall is intact so the problems are in the Cisco ASA 5505. [code]
All these remote networks are at the Main Site Clavister Firewall.
I want to establish VPN with GRE over IPsec. As ASA can't end GRE tunnels, I should pass it through inside to another 1841 router in datacentar network. Since datacentar is connected to internet via two wan links (separate ISPs) is it possible to establish two gre simultanous sessions between 1841 at branch office and 1841 at datacentar, one session per wan link at datacentar? That way, I need 8 gre separate sessions (tunnels) at datacentar 1841 router. Is it supported?Is GRE passthrough works like regular port forwarding or it is something that ASA handles with some special commands?
I'm in process of purchasing a new Cisco routers for our branches that will be used primary to enable IPSec virtual tunnel interfce with "tunnel mode ipsec ipv4". does the default IOS IP Base supports this feature? or i need to purchase DATA license or SECURITY license?
I have remote branches that connect to the corporate office as a site-to-site VPN. Now the clients at the branch are getting an application that is using an unsecured port (tcp/23). I would like to use a set of ASA 5520's that I have at the corporate office, with the AnyConnect license on them. I want the client machines to establish a tunnel from the client to one of these ASA's. The ASA' then would have a connection to the VLAN that the receiving server is housed on. The trick is to just establish the tunnel from the client to the ASA that will allow the IP of the client to not be translated. So I would use the ASA as a security 'pass-through' for the clients that use this new application.
I've been labbing on my asa5505 at home, setting up different VPN solutions for testing purposes. However, I can't get my anyconnect client to establish a DTLS tunnel when connecting (anyconnect only shows tls, and does not display any errors about not connecting with dtls)I have set dtls port to 444 and this port is open on the other side.
We have to configure our firewall cisco Asa 505 (ASA Version 8.3(1)) in order to establish a ipsec vpn between our office site and another external site. Vpn has been established successfully between our ip site 172.16.69.24 and other vpn ip site 172.16.23.23.Our server (192.168.100.25) behind firewall cisco (sk lan 192.168.100.254) manages to ping server 172.16.23.23 on other site through a static route add on windows so server (route add 172.16.23.0 MAK 255.255.255.0 192.168.100.254).On the other site, server with ip 172.16.23.23 doesn't ping our vpn ip site (172.16.69.24) which has to be natted to our server 192.168.100.25.
Can I configure a PIX (515), as PPTP client to establish a tunnel with non-Cisco PPTP server ? Can my PIX initiate this type of connection ?Today, I use a PC with PPTP client to establish this and I want replace this with a PIX and I don´t want depends of a PC.
As you can see i have problems with connecting 2 SRP521W together for an VPN tunnel. I tried as much as I can but now i dont know what to do or how and where is the mistake? the connection between these two devices was there last week, after weekend (nothing changed in configs) the connection suddenly was interrupted, without any reason or warning. another day it worked again and 20 mins later connection was dead again...and now it wont establish at all.. here are some screenshots from the vpnconfigs of my devices. one has a static IP the otherone uses FQDN. These are the IKE policies: Here the IPsec Policies: and the GRE policies:
I am trying to establish a connection with an already existing IPsec VPN for file sharing. I click on the icon and get error messages when I type the correct username and password. I also entered the shared secret key correctly. I do not know where to enter the "group" name that coincides with the key I was given.
- Ipsec tunnell between two 881's - An Aruba access point trying to set up a tunnell back to controller through the ipsec tunnell, on udp 4500 - Even though traffic shouldn't be NAT'ed (and other traffic is not), udp 4500 is NAT'ed
I guess this might be default behaviour, thing is that it used to work when it was set up as a route based easy vpn.
We have a Cisco 2820 that serves as a hub and our spokes are Cisco 871s. Its been working for a while and for some reason last week. Http and https traffic over the tunnel is having connection issues. I can Remote desktop or PCanywhere into the remote PCs. From that PC I can ping internal IP address or IP of the webmail server or internal webserver with no issue. But if I access it over the browser it times out or it will work and stop working again. Basically ica, icmp, pcanythere, rdp traffic works over the tunnel but not http or https.
can I force an IPSEC L2L tunnel to use NAT-T encapsulation no matter what? Automatic detection says none of the endpoints are behind NAT. I know I can disable it by the "crypto map XXX set nat-t-disable" command, but I want the exact opposite.
I have a very strange issue where asynchronos routing is making my life as a technician very hard.
A side question; Can I do something about an ISP that is policy-base-routing its ESP traffic (and/or translating it)?
I'm attempting to configure a tunnel on a PIX-501 version 6.3. It's an old device that's due to be replaced soon, but unfortunately we need a tunnel now... I have been using this document as a reference (6211): URL ,The remote end is a sonicwall.
The problem seems to be that the pix never sees the interesting traffic for the tunnel, and never tries to initiate a connection. I have enabled crypto ipsec and crypto isakmp debugs, but no data is ever displayed, even when attempting to access a device on the remote side of the tunnel! Someone had tried to set up this device with some tunnels in the past, but was never successful, so I'm thinking there might be remaining commands in the running-config causing problems.
configuring some static NAT entries on a remote site 887 router which also has a IPSec tunnel configured back to our main office.
I have been asked to configure some mobile phone "boost" boxes, which will take a mobile phone and send the traffic over the Internet - this is required because of the poor signal at the branch. These boxes connect via Ethernet to the local network and need a direct connection to the Internet and also certain UDP and TCP ports opening up.
There is only one local subnet on site and the ACL for the crypto map dictates that all traffic from this network to our head office go over the tunnel. What I wanted to do was create another vlan, give this a different subnet. Assign these mobile boost boxes DHCP reservations (there is no interface to them so they cannot be configured) and then allow them to break out to the Internet locally rather than send the traffic back to our head office and have to open up ports on our main ASA firewall.
So I went ahead and created a separate vlan and DHCP reservation and then also followed the guidelines outlined above about using a route-map to stop the traffic being sent down the tunnel and then configured static NAT statements for each of the four ports these boost boxes need to work. I configure the ip nat inside/outside on the relevant ports (vlan 3 for inside, dialer 1 for outside) The configuration can be seen below for the NAT part;
! Denies vpn interesting traffic but permits all otherip access-list extended NAT-Trafficdeny ip 172.19.191.0 0.0.0.255 172.16.0.0 0.3.255.255deny ip 172.19.191.0 0.0.0.255 10.0.0.0 0.255.255.255deny ip 172.19.191.0 0.0.0.255 192.168.128.0