This indicates an attack attempt to exploit a Denial of Service vulnerability in FreeBSD.
This issue is caused by an error in the vulnerable system when handling maliciously crafted packets. It may allow remote attackers to crash vulnerable systems via RIP requests.
FreeBSD Project Routed
FreeBSD Project FreeBSD releng/10.1.x prior to 10.1-RELEASE-p17
FreeBSD Project FreeBSD stable/9.x prior to 9.3-STABLE
FreeBSD Project FreeBSD releng/9.3.x prior to 9.3-RELEASE-p22
System Compromise: Remote attackers can crash vulnerable systems.
Apply the most recent upgrade or patch from the vendor