I am not an expert on the SRX240 so maybe this is a weird question.. We need to configure a firewall rule on our SRX240 to allow a specific device. Unfortunately we can not do this based on IP address because it will always change. Does anyone have experience with that? Is this possible at all?
Thanks very much for your reply. It's a VOIP phone we want users exernaly connect to our internal PBX voip server through the firewall. So, the device will be used on different home networks with different IP addresses which I have no influence on. If I open the Juniper firewall for all IP addresses on the SIP 5060 port, my VOIP server is flooded with connection attemps from hackers.