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It's likely that the "attacking" device for your "ping of death" is external to your firewall, and probably spoofed for good measure.
To see anything with Wireshark you'll need to arrange a capture on the interface of the firewall that is receiving these packets. The firewall may be able to perform a capture itself that you can then inspect with Wireshark.
See the Wiki page on Ethernet capture setup for more info, with particular interest on capturing switched networks.
