You can easily block unwanted traffic using IPTABLES. However, if your using csf/lfd from configserver you can easily block specific traffic.
[ad#engineertim-blog] Edit: I have uploaded a .tar file of the rules that can be downloaded. rules.tar Thank you to a couple users who pointed out that my bfd rules were a little less than perfect. They worked great for me on a older version of bfd, but I believe a update to the bfd application …