Is the network setting data correct?

Question

Computer networks

The provider issued the following settings:
static: xxx.yyy.8 0.21 Subnet
: xxx.yyy.8 2.20 / 30 I understand that it should be either xxx.yyy.80.21 and xxx.yyy.80.20/30, or
xxx.yyy.82.21 and xxx.yyy.82.20/30, i.e. they must match.
Accordingly, this is transformed into:
address xxx.yyy.80.21
mask 255.255.255.252
gateway xxx.yyy.80.22
Are these settings correct? Or have I misunderstood something?
upd. The following settings turned out to be correct:
address xxx.yyy.80.21
mask 255.255.255.0
gateway xxx.yyy.80.1

Answer 1

More like a typo. Mask /30 (.252), covers a range of up to 4 IP addresses, which must include at least your device and gateway, plus two free ones.
Check with your provider, or try both options, where 80 everywhere or 82 everywhere.

Answer 2

The default gateway must be within the local network relative to the client. The /30 mask gives two usable addresses (there are 4 in total, but one is the network address, the second is for broadcasting), so the settings are wrong. The client itself does not get into the local network with its router. If there are no additional routes added, the client will not be able to send packets to the gateway.