NB! It seems this console command is not compatible with CS2.
Command Profile

NET_ALLOW_MULTICAST

CS:GO

This command sets whether or not multicast is enabled. Default is 1 (enabled).

Syntax
net_allow_multicast [0 / 1]

Description

This command sets whether or not multicast is enabled. Default is 1 (enabled).

Syntax And Arguments

net_allow_multicast [0 / 1]
0 / 1 Enter 0 here to disable the multicast network setting. Enter 1 here to enable the multicast setting (default).

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