[CentOS] CentOS based router dropping connections

Hmmmmm sounds like possible duplex issue

I try to add this to my 

/etc/sysconfig/network-scripts/ifcfg-eth0 file at the bottom

ETHTOOL_OPTS="speed 100 duplex full autoneg off"

So that it always boots as we desire.

You can modify as you need or run ethtool as desired

man ethtool

 - rh