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A comment on Blacknurse – Low bandwidth ICMP firewall attack. Parent comment
ICMP types 3 and 4 should always be allowed.
At your discretion, you may allow other types as well.
Inbound, I allow types 0, 3, 4, 8, and 11, but I'm a network engineer. A paranoid security guy may prefer to block some of those.
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ICMP types 3 and 4 should always be allowed.
At your discretion, you may allow other types as well.
Inbound, I allow types 0, 3, 4, 8, and 11, but I'm a network engineer. A paranoid security guy may prefer to block some of those.