![]() ![]() So SRX-12 thinks the NAT'ed ESP packets are destined for itself, and not part of a NAT session. It is recieving ESP packets on it's interface performing the NAT operation, ge-0/0/5.0, but it isn't finding a matching SPI. SRX-13 IPSEC run show security ipsec statisticsīad headers: 0, Bad trailers: we perform a flow trace with all of the IPSEC flags turned on we find that SRX-12 is dropping packets. SRX-11 IPSEC run show security ipsec statisticsĪH authentication failures: 0, Replay errors: 0ĮSP authentication failures: 0, ESP decryption failures: 0īad headers: 0, Bad trailers: still, we find that SRX-13 is both encrypting and decrypting ESP packets. However, SRX-11 is encrypting packets, but it's not getting anything in return to decrypt. [edit security we apply this to our IPSEC tunnel between SRX-11 and SRX-13 we find that IP Protocol 50 (ESP) is being used for transport. An operator might rather have a tunnel go down and take an alternate path if something starts NATing between IPSEC peers (which would require VPN monitoring, a dynamic routing protocol, RPM probe or OAM).ĭisabling NAT-T on the SRX is configured with the no-nat-traversal on each IKE gateway that shouln't bother with doing NAT-T negotiations. It does add a more overhead in the form of a standard UDP header and introduces more packet noise with NAT keepalives. However, using NAT-T may not always be desired behavior. In this way you can configure IP monitoring in SRX Cluster depending upon your scenario.NAT-T negotiations for IPSEC are all on by default on the SRX. Now, in our scenario, if the primary Internet link between switch and ISP fails, then node1 will become primary for the chassis cluster and the Internet traffic will now be sent by node 1 via secondary Internet link. ![]() show chassis cluster ip-monitoring status redundancy-group 1Īs you can see node 0 and node 1 is reachable. ![]() To view the IP monitoring status type the following command. The SRX redundancy groups configuration looks like this, So IP monitoring feature must be configured in order to switch the SRX cluster node if one of the link between switch and Internet fails. In case as shown below if one of the internet link between switch and ISP fails, then the Internet connection will not be available. The public IP address configured on Reth0 is 2.2.2.2/29 and the gateway is 2.2.2.1 to reach the Internet. As seen in the diagram below, we have SRX node 0 as primary and node 1 as secondary. In our scenario, we have active/passive SRX cluster configured already. Generally, the IP to be monitored is the gateway IP address. You can easily configure IP monitoring in SRX cluster. ![]() IP monitoring allows you to monitor specific IP address and when the specified IP address is unreachable, the fail-over is initiated. Interface monitor feature configured in redundancy group is unable to accomplish such failover, so there is other feature called IP monitor. In Juniper SRX cluster, you can configure fail-over in a way that if a specified IP address is unreachable then failover is initiated. There might be case in our network where we want to fail-over to secondary node when the Internet connection breaks or link breaks. ![]()
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