Tunnel auto deletion / expiry rules

[paver]

Hi,

I've been a user of the service for a year or two now and noticed that my tunnel had recently been deleted (within the past 2 weeks or so).

Could it be because I'd not updated my IP there for some time? I have a script running on my Mikrotik which will auto update the tunnel when my public ipv4 changes, but it hasn't for some time.

What is the official policy on inactivity & deletion?

Thanks

[snarked]

Your tunnel must respond to pings, and if it is silent for 90 days, it is deleted.  I don't remember whether the pings are via IPv4 or IPv6, but it is considered "best practice" to allow both.  For IPv6, the tunnel endpoint is used, not the routed /64 or /48.  I do not recall whether changing the IPv4 tunnel endpoint also resets the timeout period.

[kcochran]

The ping is nice, but we usually check the actual traffic received from the other side of the tunnel.  If we've seen zero bytes from the remote end in that time period, the tunnel is eligible for removal.  Our routine ping checks should run that up if the remote side is configured, so functionally not too far off.