Sonicwall NSA 250m - how to block attempts to connect to L2TP VPN from intruders
The Sonicwall OS is 5.x. This is just the base router, no extra licenses for IPS, malware etc... I recently setup L2TP VPN for a couple users - using long and complex Pre-shared secret and each have a very long and complex password... I have been blocking obvious attempts from just IP addresses trying to access a webcam port using the info I found on how to do that - but blocking an IP address from WAN - doesn't seem to affect efforts of a couple outsiders trying to access via L2TP - I see the failed messages from the different stages... but they keep trying - and added their IPs to my 'Blocked IPs' address object group has no effect.
I want to be able to deny them access to even try to authenticate and get them out of the logs - like blocking IP addresses.
Anyone savvy on the SonicWALL as to how to prevent attempted L2TP connections from undesired sources? Is there a way to create access rules to block from L2TP to ANY or LAN, we have the network on the X0 interface.
My understanding is there is a VPN access list on the SonicWALL - but it does not apply to L2TP.