The following example creates an address list of people thet are connecting to port 23 (telnet) on the router and drops all further traffic from them. Additionaly, the address list will contain one static entry of address=192.0.34.166/32 (www.example.com):
[admin@MikroTik] > /ip firewall address-list add list=drop_traffic address=192.0.34.166/32
[admin@MikroTik] > /ip firewall address-list print
Flags: X - disabled, D - dynamic
# LIST ADDRESS
0 drop_traffic 192.0.34.166
[admin@MikroTik] > /ip firewall mangle add chain=prerouting protocol=tcp dst-port=23 \
\... action=add-src-to-address-list address-list=drop_traffic
[admin@MikroTik] > /ip firewall filter add action=drop chain=input src-address-list=drop_traffic
[admin@MikroTik] > /ip firewall address-list print
Flags: X - disabled, D - dynamic
# LIST ADDRESS
0 drop_traffic 192.0.34.166
1 D drop_traffic 1.1.1.1
2 D drop_traffic 10.5.11.8
[admin@MikroTik] >
As seen in the output of the last print command, two new dynamic entries appeared in the address list. Hosts with these IP addresses tried to initialize a telnet session to the router.
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