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Intrusion prevention warning

Hi all,

in my UTM9 SG310

latest firmware installed 9.510-5

I got several mail from IPS told me some attack from the same IP public address. Checked the geo position i assume is an unwanted user.

So i wish block this IP.

Applying a rule on firewall were: the source ( ip address unwanted) any services going to my network is dropped nothing happens. The pubblic IP unwanted continuing to knock on my door.

Where i'm wrong

Thanks Gian Luca

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0 Jason Klein over 6 years ago

Hi Gian,

The Firwall Framework works like this.

*incoming Packets*

1. RAW packet processing

2. Contract

3. DNAT

*Routing*

*Forward*

4. Packet Filter

5. IPS

Since the Packet Filter is applied before the IPS kicks in there needs to be something wrong with your Rule if the rule doesnt Block / drop it.

Please show us the Screenshot where we can see the IP and the Port the IP uses. Then post a screenshot of your Top firewall rules.

Also post a screenshot of your NAT rules.

Regards

Jason

Regards

Jason

Sophos Certified Architect - UTM
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0 Jason Klein over 6 years ago

Hi Gian,

The Firwall Framework works like this.

*incoming Packets*

1. RAW packet processing

2. Contract

3. DNAT

*Routing*

*Forward*

4. Packet Filter

5. IPS

Since the Packet Filter is applied before the IPS kicks in there needs to be something wrong with your Rule if the rule doesnt Block / drop it.

Please show us the Screenshot where we can see the IP and the Port the IP uses. Then post a screenshot of your Top firewall rules.

Also post a screenshot of your NAT rules.

Regards

Jason

Regards

Jason

Sophos Certified Architect - UTM
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0 Gian Luca Gaddoni over 6 years ago in reply to Jason Klein

Here the screenshot
below you can see top firewall rules and also ip addresses unwanted

DNAT rules

Thanks Gian Luca
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0 Jason Klein over 6 years ago in reply to Gian Luca Gaddoni

Hey Gian,

and the foreign IP wants to access your Server via Port 80?

-Jason

Regards

Jason

Sophos Certified Architect - UTM
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0 Gian Luca Gaddoni over 6 years ago in reply to Jason Klein

HI,

Yes the foreign IP looking for...

Gian Luca
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0 Jason Klein over 6 years ago in reply to Gian Luca Gaddoni

Hi,

You might want to test a black hole Nat for the IP.

Create a rule (maybe IP Range in case you get more in the future).

New Target:

Source: the IPs that are getting through

Service: HTTP

Destination: should be to an IPv4 address in 240.0.0.0/4 or to one in 100::/64 for IPv6.

Position that rule above your others so that i gets processed first, in theory the IP should be nated into the black hole then.

Regards

Jason

Sophos Certified Architect - UTM
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+1 Gian Luca Gaddoni over 6 years ago in reply to Jason Klein

Hi,

the application of the DNAT blackhole rule as you suggested works fine.

Thank you very much
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