192.168.254.254

interface bri 0
ip unnumbered ethernet 0
dialer map ip 192.168.254.254 name remote-name speed 56 remote-number
!
ip route 0.0.0.0 0.0.0.0 192.168.254.254 
ip route 192.168.254.254 interface bri 0

The address 192.168.254.254 is specified in RFC 1597, Address Allocation for Private Internets. RFC 1597 addresses are available for private use. They are never used on the public Internet.

Using unnumbered interfaces for the BRI results in the static routing and dialer map commands still needing an IP address. However, this address is never advertised outside the router and no packets are ever addressed to it.

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