According to the official collectd documentation found here.
TimeToLive 1-255 Set the time-to-live of sent packets. This applies to all, unicast and multicast, and IPv4 and IPv6 packets. The default is to not change this value. That means that multicast packets will be sent with a TTL of 1 (one) on most operating systems.
In a nutshell, can anyone explain to me what really is TimeToLive? The description they got there is not clear to me.
"TimeToLive -> Sets the time-to-live of sent packets"
Don't find this very helpful...
It's not a collectd concept, but merely a networking one: the maximum number of routers the packet should be allowed to traverse before being dropped.