![]() 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. If the VPN tunnel terminates to the trust interface on the SRX, you must still have a security policy which permits trust to trust traffic (inside interface to tunnel interface).We’re getting on the Microsoft Office 366 and band wagon.The first option ensures that SRX starts VPN negotiations as soon as a commit is performed. With the second option configured, SRX will start VPN negotiations ONLY if it receives traffic that matches the configured proxy ID's. Customers can configure “Establish Tunnels immediately” or “Establish Tunnels on-traffic” on SRX to bring their VPN up.To simplify the configuration, disable tunnel monitoring on the SRX and PA.“df-bit clear” on the SRX works well with the PAN and allows packets larger than 1350 to be fragmented and sent over the tunnel. ![]() “PFS group2” on the SRX is synonymous with the” IPSEC Crypto “ DH group 2” policy on the PAN.Testing shows a value 1350 is still large enough, but small enough not to be dropped along the way. Reducing the MTU on both devices has been found to help connectivity.Its not mandatory to not have an IP on tunnel interface. VPN will come up with or without an IP address on tunnel interface (st0).SRX Secure Tunnel Interface Configuration: There is no requirement to not configure proxy ID’s if SRX is configured for route-based VPN’s. The VPN will come up as long as the proxy ID’s match on both sides. ![]() In this sample configuration, a Juniper SRX firewall is using a route-based VPN configuration terminating at a Palo Alto Networks firewall. This document is intented to give simple tips to help in configuring a Juniper to Palo Alto Networks VPN.
0 Comments
Leave a Reply. |