![]() ![]() Set security ipsec vpn lon-man-vpn ike gateway LON-SRX Set security ipsec vpn lon-man-vpn bind-interface st0.0 Set security ipsec policy lon-man-ipsec-policy proposal-set compatible Next, create an IPSec policy called ‘lon-man-ipsec-policy’ and apply it to a new VPN called ‘lon-man-vpn’ to be formed with the London SRX over the ST interface: Set security ike gateway LON-SRX external-interface ge-0/0/1.0 Set security ike gateway LON-SRX address 172.16.0.1 Set security ike gateway LON-SRX ike-policy lon-man-ike-policy Set security ike policy lon-man-ike-policy pre-shared-key ascii-text VeryStrongKey Set security ike policy lon-man-ike-policy proposal-set compatible Set security ike policy lon-man-ike-policy mode main Now create an IKE policy (we’ll call ours ‘lon-man-ike-policy’) and tell the Manchester SRX to use this for IKE negotiations with the London SRX over the external interface: Set security zones security-zone INTERNET host-inbound-traffic system-services ike Next, to allow the tunnel to form we need the SRX to listen for IKE packets on it’s external interface: Set security zones security-zone VPN interfaces st0.0 Set interfaces st0 unit 0 family inet address 1.1.1.2/30 To build our tunnel, we first need to create our ST interface and bind it to a new security zone that we’ll call ‘VPN’: To keep things brief, all config examples will show the Manchester end of the tunnel. Here is our network diagram before the VPN is set up showing two LAN’s (Manchester and London) connected via a pair of SRX’s over the ‘internet’: when the route to a particular network is via a Secure Tunnel (ST) virtual interface. With a route based VPN, there is no particular policy tied to a VPN tunnel, rather traffic is forwarded across a tunnel link based on the routing table. Monitor security flow trace file: /var/log/securityflow.logĬopy the log file to another system if you want to analyse it further > file copy /var/log/securityflow.log stopping your monitor, you can then tidy up removing your file and filter using > file delete /var/log/securityflow.Here’s how to build a simple route based IPSec VPN between two Juniper SRX gateways. Monitor security flow session status: Active View the current status of your monitor > show monitor security flow Then you can start and stop the monitor as you need. > monitor security flow file size 10240 securityflow.log > monitor security flow filter interface reth0 source-prefix 192.168.56.10 myfilter In this example we’re going to capture packets from a specific ip address on a particular interface.Ĭreate a named filter called ‘myfilter’ and then create a file to log into. So the session-init just logs the attempt.īut what if we’re missing some rule logging, or are a bit unsure if packets coming in are actually coming in or not? That where monitor security flow comes in handy.Īt the cli on the SRX you need to setup and activate the security flow, the filters to apply and the file to log to. īut in our Deny All rules we log the session-init – because a denied session never gets closed (it’s never opened). So for rules where we allow we can log the data at session-close. ![]() It is reliant upon us having the relevant log setting in the rules. We stream the Juniper SRX logs out to our syslog server and that seems to work quite well. You have to assume that Azure just works. Get your device side right and do your debugging from there and let Azure sit and just do it’s thing. We’ve got some consultants in setting up the Azure side of the VPN and once I got into the portal I laughed at how much they were charging for turning on the VPN feature and setting a private key – that’s it! There’s very little control to be able to do anything else and if you want logs to see why things aren’t going to plan, you’d better rely on your own device for that.Īfter a couple of hours they’d written some PowerShell to gather some information that was stale because we’d already moved on past that particular error.īut that said, the Azure side just works. Not just with Juniper, but a range of firewalls. Microsoft have a Github page with not just guidance, but specific configuration examples to help do this. This means we need to setup an IPSec VPN between the Juniper SRX and Azure. I’m not a Microsoft fan, and think it’s overpriced for the functionality we’ll actually use. We’re getting on the Microsoft Office 366 and band wagon.
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