Src nat pool and IP address on WAN interface

RouterOS General
1

Hi,

I want to NAT private network 172.19.128.0/21 to range of public addresses X.X.X.1 - X.X.X.14:

/ip firewall nat add action=src-nat chain=srcnat out-interface=WAN src-address=172.19.128.0/21 to-addresses=X.X.X.1-X.X.X.14

Should I configure only one IP address from public network on my Mikrotik WAN interface, for example X.X.X.1/28

or

Should I configure all of those public IP addresses from X.X.X.1/28 to X.X.X.14/28 on my Mikrotik WAN interface?

2

It depends on how the service provider routes the /28 subnet to you. I've a recent post in another thread about this.

3

whole /28 class is routed by provider using separate /30 class, so I can use all 16 addresses.

4

If it is not explained, its usefulness is lost.

Is also lost why use 172.19.128.0/21 instead, fore example, 192.168.0.0/21

5

Then in that case you don't need to add the addresses of the /28 subnet to the WAN interface under /ip address. You only need to add the address(es) from the /30 subnet.

6

. . . deleted, it seems it wasn't needed . . .

7

Thank you