Ineffective IP spoofing protection

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Ineffective IP spoofing protection

L4 Transporter

I have IP spoofing protection enabled on PaloAlto but it is not effective due to the following reason:


My external Interface IP is . The spoofed attacks are coming from a fictitious source IP for e.g. destined to server). As per Palo's IP spoofing definition, this is not blocked because is routable over that interface. I am considering to write an ACL on the neighboring router that says block all inbound connections with source IP in subnet. 


Has anyone implemented this? Am I right in my approach?




Accepted Solutions

So you have this network between the router and the firewall and use the IPs for destination NAT to the servers which have private IP addresses?

Now I think I understand your problem and in this case - if you do not want to change a little bit in your setup - the ACL on the router probably is the best option with the downside that then you don't see these dropped connections in the threat log.

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Cyber Elite
Cyber Elite

Hi @SThatipelly 

Did you enable "Strict IP Address Check" or only "Spoofed IP address" in the packet based attack protection of the zone protection profile?

@vsys_remo I have none of them enabled. I was worried they may drop any legitimate traffic so, didn't enable them.

Hi @SThatipelly 

Now I am a little confused. Without these options, how did you expect the firewall to block spoofed connections?

@vsys_remo I understand but what I'm looking for is has anyone enabled this and observed such attacks getting dropped? as per the definition, those attempts will not be blocked by that IP spoofing protection feature. 

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