I have a 3200 with 5 Dialout VPNs using ipsec. All dial to separate 2850s.

One of those VPNs drops every 50 minutes, pretty much on the dot. It still shows as up in the web interface, but ping shows no traffic. Traffic to the external ip etc is fine.

A quick press of drop on the interface sorts it out. Most recent firmware on the 2850 and 3200. The particular 2850 runs VDSL.

Does anyone have any ideas please? Draytek support seem to be too busy looking at my 2960 problems to fix this one!