Under heavy network load "ip_conntrack: maximum limit of XXX entries exceeded" messages appear on Digi CM console.

This means that the conntrack database doesn't have enough entries for your environment. Connection tracking by default handles up to a certain number of simultaneous connections. This number is dependent on your system's maximum memory size (at 64MB: 4096, 128MB: 8192, ...). You can easily increase the number of maximal tracked connections, but be aware that each tracked connection eats about 350 bytes of non-swappable kernel memory!

To increase this limit to e.g. 8192, type this from the CM CLI:

      echo "8192" > /proc/sys/net/ipv4/ip_conntrack_max