This behaviour can be usefull, for example, if you want to assign dial-in (ppp, pppoe, pptp) clients
IP addresses from the same address space as used on the connected LAN.
Example
Consider the following configuration:
The MikroTik Router setup is as follows:
admin@MikroTik] ip arp> /interface ethernet print
Flags: X - disabled, R - running
# NAME MTU MAC-ADDRESS ARP
0 R eth-LAN 1500 00:50:08:00:00:F5 proxy-arp
[admin@MikroTik] ip arp> /interface print
Flags: X - disabled, D - dynamic, R - running
# NAME TYPE MTU
0 eth-LAN ether 1500
1 prism1 prism 1500
2 D pppoe-in25 pppoe-in
3 D pppoe-in26 pppoe-in
[admin@MikroTik] ip arp> /ip address print
Flags: X - disabled, I - invalid, D - dynamic
# ADDRESS NETWORK BROADCAST INTERFACE
0 10.0.0.217/24 10.0.0.0 10.0.0.255 eth-LAN
1 D 10.0.0.217/32 10.0.0.230 0.0.0.0 pppoe-in25
2 D 10.0.0.217/32 10.0.0.231 0.0.0.0 pppoe-in26
[admin@MikroTik] ip arp> /ip route print
Flags: X - disabled, I - invalid, D - dynamic, J - rejected,
C - connect, S - static, R - rip, O - ospf, B - bgp
# DST-ADDRESS G GATEWAY DISTANCE INTERFACE
0 S 0.0.0.0/0 r 10.0.0.1 1 eth-LAN
Page 105 of 695
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