![]() If this post was helpful, please mark this post as an "Accepted Solution". The ICMP traffic fails, the VPN is considered down. VPN monitoring and dead peer detection (DPD) are features available on SRX Series devices to verify the availability of VPN peer devices. The static routes disappear when IKE / IPSec are active. ![]() Of the tunnel (such as a server), along with specifying the source IP address of the ICMP traffic. SRX 345 running JUNOS 15.1X49-D130.6 New system with two route-based VPNs configured. ![]() some commands Juniper srx dynamic VPN configuration transparency is important. Network Security Administrator T-Systems Jun 2014 - Oct 20151. The Junos OS command-line interface (CLI) is a command shell specific to. Configuring new VPN connections, troubleshooting VPN issues. The SRX to send ICMP traffic either to the peer gateway, or to another destination on the other end No - Enable the VPN Monitor 'Optimize' setting and test the VPN connection again. Daily work with Cisco switches and Juniper SSG and SRX firewalls. Internet Control Message Protocol (ICMP) to determine if the VPN is up. VPN monitoring is not an Ipsec standard feature, but it utilizes One issue with DPD is that it doesn’t necessarily mean the underlying VPN is up and running, just Sensors based on MIBs need to be better configurable. I wish there would be a dedicated sensors for SSGs, just like ASAs. PRTG works great for policy based VPNs on Cisco ASAs, but for route-based VPNs on Juniper, it is not quiet the same. Is VPN Monitor a better choice? If pings from VPN Monitor fail, will the tunnel be declared dead more quickly- or does the system still wait for the Dead Peer Detection to trigger?īottom line question- what is the best practice for (a) discovering a dead tunnel more quickly than 10-20 seconds, (b) without needless false "dead" alarms that will trigger a route change? VPN monitoring is one of the top priorities for us. Problem is, if Dead Peer Detection is set to declare death after a single missed response, we risk needlessly flapping our tunnel routes every time a single "check for up" packet is lost. adminhost> monitor traffic interface ge-0/0/1 matching 'icmp or tcp' verbose output suppressed, use or for full protocol decode Address resolution is ON. I'm looking for a way to more quickly determine when a VPN is declared "down" so OSPF can respond a lot more quickly to LEGITIMATE outages- within a few seconds at most. For example you issued the following command and you started ping from another host towards this Junos router. So this means at least (10 second interval x 2 tries) 20 seconds before an unresponsive tunnel is declared dead and OSPF changes the route (to a less desirable tunnel). The minimum check interval in VPN Dead Peer Detection is 10 seconds, and we want to check at least twice before the tunnel is declared dead. What is the difference between "VPN Monitor" and VPN "Dead Peer Detection"?
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