Draytek Vigor2925 Series User Manual page 195

IPv4 Border Relay
IPv4 Mask Length
6rd Prefix
6rd Prefix Length
WAN Connection
Detection
After finished the above settings, click OK to save the settings.
Below shows an example for successful IPv6 connection based on 6rd mode.
Type the IPv4 addresses of the 6rd Border Relay for a given
6rd domain.
Type a number of high-order bits that are identical across
all CE IPv4 addresses within a given 6rd domain.
It may be any value between 0 and 32.
Type the 6rd IPv6 address.
Type the IPv6 prefix length for the 6rd IPv6 prefix in
number of bits.
Such function allows you to verify whether network
connection is alive or not through NS Detect or Ping Detect.
Mode – Choose Ping Detect or Always On for the system
to execute for WAN detection.
Always On - The network based on IPv6 will be kept
connected.
Ping IP – If you choose Ping Detect as detection mode, you
have to type IP address or hostname for pinging.

Ping IP/Hostname – Type the IP address/host name in
such field.

TTL (Time to Live) – Displays value for your
reference. TTL value is set by telnet command.
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Vigor2925 Series User's Guide