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Do I not need a default deny firewall rule to block WAN traffic?

I have much experience with other firewalls, specifically Sonicwall appliances. With those devices, I will typically have a default deny rule like this:

Is this not necessary in a UTM 9? Everything seems to work fine with only a NAT rule, it just seemed odd to me. Is all traffic blocked unless otherwise configured, I.E. it wouldn't know what to do with that traffic?

Thanks!

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0 sachingurung over 9 years ago

Hi William,

Interesting question, we do not block WAN to LAN communication via a Firewall Rule. But we must take care of few things like your Global DNS server should not be exposed to ANY network, SSH access should be allowed on a particular IP address and there should be explicit IPS policies in place to prevent attacks.

Thanks

Sachin Gurung
Team Lead | Sophos Technical Support
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