need to block ransome ip in MX firewall

[Mkarthikeyan]

we have set of Ransomware public IPs that need to block in layer 3 policy

[Brash]

You can block specific IP's in the MX Layer 3 firewall rules under Security & SD-WAN -> Firewall.
I'd also suggest blocking some of the security related categories under content filtering.

[Mkarthikeyan]

like i have trying to block specific public ip it shows only ipv6 can block

[ww]

Use the outbound rules.

Inbound ipv4 sessions are blocked by default

https://documentation.meraki.com/MX/Firewall_and_Traffic_Shaping/MX_Firewall_Settings#Outbound_rules

[KingArthur]

As a minimum use opendns as your dns servers. This will already help a lot.