Event Viewer Warnings

Just wondering if I should be worried about the following reoccuring warning messages:

Event 5501
Source: DNS
Description: DNS Server encountered bad packet from IP Address . Packet processing leads beyond packet length.

Event 9999
Source: DNS
Description: DNS Server has encountered numerous run-time events. These are usually caused by the reception of bad or unexpected packets, or from problems with or excessive replication traffic. The data is the number of suppressed events encountered in the last 15-minute interval.

Thanks