networking - How can I detect a DDoS attack using pfSense so I can tell my ISP who to block?

Last week my network was hit by a DDoS attack which completely saturated our 100 MBps link to the internet and pretty much shut down all the sites and services we host.

I understand (from this experience as well as other answers) that I cannot handle a DDoS attack such as this on my end, because even if we drop the packets they have still been sent over our link and are saturating our connection.

However when this happened my ISP was (strangely enough) unable to tell me where the attack was coming from. They said if I could determine the source (E.G. via tcpdump) I could give them IP addresses to block. But things were so overloaded that running tcpdump was impossible. I just couldn't view the output.

Nearly all our servers are behind a pfSense router. How can I detect a DDoS attack using pfSense so I can tell my ISP who to block? I don't want to block the attack myself, I just want to get alerts / be able to view a list of IP addresses that are using way more bandwidth than normal.

The pfSense router is running Snort, if that can be used to assist in any way.

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