Unnumbered Interfaces

Unnumbered Interfaces

Description

Unnumbered interfaces can be used on serial point-to-point links, e.g., MOXA or Cyclades interfaces. A private address should be put on the interface with the network being the same as the address on the router on the other side of the p2p link (there may be no IP on that interface, but there is an ip for that router).
Example

[admin@MikroTik] ip address> add address=10.0.0.214/32 network=192.168.0.1 \
\... interface=pppsync

[admin@MikroTik] ip address> print

Flags: X - disabled, I - invalid, D - dynamic
# ADDRESS NETWORK BROADCAST INTERFACE
0 10.0.0.214/32 192.168.0.1 192.168.0.1 pppsync
[admin@MikroTik] ip address>
[admin@MikroTik] ip address> .. route print detail
Flags: X - disabled, I - invalid, D - dynamic, J - rejected,
C - connect, S - static, R - rip, O - ospf, B - bgp
0 S dst-address=0.0.0.0/0 preferred-source=0.0.0.0 gateway=192.168.0.1
gateway-state=reachable distance=1 interface=pppsync

1 DC dst-address=192.168.0.1/32 preferred-source=10.0.0.214
gateway=0.0.0.0 gateway-state=reachable distance=0 interface=pppsync

[admin@MikroTik] ip address>
As you can see, a dynamic connected route has been automatically added to the routes list. If you want the default gateway be the other router of the p2p link, just add a static route for it. It is shown as 0 in the example above.
Troubleshooting
Description
• Router shows that the IP address is invalid
Check whether the interface exists to which the IP address is assigned. Or maybe it is disabled. It is also possible that the system has crashed - reboot the router.
• Router shows that the ARP entry is invalid
Check whether the interface exists to which the ARP entry is assigned. Or maybe it is disabled. Check also for an IP address for the particular interface.