Looking at the debug output from debug crypto ikev2 protocol 50, debug crypto ikev2 platform 50 and debug crypto ipsec 50 does not show any hint that the ASA at least tries to build the tunnel. This however is not the idea of this concept, as the tunnel should be established such that the support engineers connected to the ASA via An圜onnect can access the router and troubleshoot any issues. Then the SA is up and I can connect to the router from the An圜onnect pool. The second SA (192.168.10.0/24 192.168.255.0/24) however only works when I first initiate the SA from the routers end by sending some packets (for example with ping 192.168.255.10 sourve vlan 10 repeat 1, where the. This actually works fine, the IKEv2 SA is up and working, the first child SA is also up and running. To fire up the tunnel as soon as the router starts and has an IP address assigned on is outside interface (Gi 0/0), the router has an NTP server configured which is in the xx.xx.66.0/24 network. There are two SAs defined for the IPSec connection, the left IP is the router's side, the right IPs are ASA.ġ92.168.10.0/24 is a network behind the router, while xx.xx.66.0/24 is the network behind the ASA and 192.168.255.0/24 is the IP pool for An圜onnect clients connecting to the ASA. On ASA side, the VPN peer is hence not configured, a dynamic crypto-map is used. The router is mobile, hence it has changing outside addresses and is always the initiator. The tunnel initially comes up fine as soon as there is some traffic from the routers end. If you want to allow the NTP protocol through your firewalls, you must open port UDP 123.I have a Cisco 2911 router and a Cisco ASAv connected using a IKEv2 based IPSec tunnel. There are several external NTP servers available which you can use to synchronize your ASA devices (or any network equipment), such as, NIST Servers ( ) etc.
In public telecommunication networks (mobile 4G, fixed telephony etc) where time settings must be accurate in the range of milliseconds (or even smaller), atomic clocks are used for syncing the time. Some companies use the internal Active Directory server (which is already synchronized to an accurate external NTP server) in order to provide time settings to all internal IT assets. You can retain correct time settings on all of your network and IT devices using several ways. If you want to investigate a security breach or you want to take legal actions against a hacker or an employee who leaked corporate data to a competitor, then having logs with correct timestamps is very important. This is especially true in the security realm. In the networking and IT world in general, having accurate time settings on all the devices of the network is of paramount importance. Both an authenticated and non-authenticated NTP is supported:Ĭiscoasa(config)# ntp server source Ĭiscoasa(config)# ntp server 10.1.23.45 source insideĬiscoasa(config)# ntp authentication-key md5 Ĭiscoasa(config)# ntp trusted-key Ĭiscoasa(config)# ntp server key source Ĭiscoasa(config)# ntp authentication-key 32 md5 secretkey1234Ĭiscoasa(config)# ntp server 10.1.2.3 key 32source inside If there is an NTP server in the network that provides accurate clock settings, then you can configure the firewall to synchronize its time with the NTP server. To configure the time zone and the summer daylight saving time use the commands below:Ĭiscoasa(config)# clock timezone Ĭiscoasa(config)# clock summer-time recurring Ĭiscoasa(config)# clock summer-time MST recurring 1 Sunday April 2:00 last Sunday October 2:00 Configure Network Time Protocol (NTP):
Configure Time Zone and Daylight Saving Time: To verify the correct clock on the appliance, use the show clock command.
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