On Fri, 15 Aug 2014 09:19:29 -0400 David Both wrote: > I hope this helps. Nah, all the forwarding rules were in place. They all worked before I switched to centos7, and they all worked after I booted the fedora kernel. No sysctl or iptables changes were made when switching from centos to fedora kernel, yet the forwarding started working after booting fedora. I suspect if I backed up to the kernel centos 6.5 uses that would work as well. I betcha someone has a < that should be a <= somewhere in an MTU size check in the centos7 kernel :-).