iptables는 SSH 무차별 대입 크래킹을 방지하지 않습니까?

다음 iptables 파일이 있습니다.

# Generated by iptables-save v1.4.21 on Sat Jul  8 11:48:38 2017
*raw
:PREROUTING ACCEPT [75178374:102748773110]
:OUTPUT ACCEPT [48791071:12009917336]
COMMIT
# Completed on Sat Jul  8 11:48:38 2017
# Generated by iptables-save v1.4.21 on Sat Jul  8 11:48:38 2017
*nat
:PREROUTING ACCEPT [30891:2719901]
:POSTROUTING ACCEPT [102225:7602312]
:OUTPUT ACCEPT [85794:6945072]
COMMIT
# Completed on Sat Jul  8 11:48:38 2017
# Generated by iptables-save v1.4.21 on Sat Jul  8 11:48:38 2017
*mangle
:PREROUTING ACCEPT [75178374:102748773110]
:INPUT ACCEPT [75177630:102748652126]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [48791071:12009917336]
:POSTROUTING ACCEPT [48791629:12010008074]
COMMIT
# Completed on Sat Jul  8 11:48:38 2017
# Generated by iptables-save v1.4.21 on Sat Jul  8 11:48:38 2017
*filter
:INPUT DROP [0:0]
:FORWARD DROP [0:0]
:OUTPUT ACCEPT [260:167959]
:FILTER - [0:0]
:LOGDROP - [0:0]
:SERVICE - [0:0]
:SSH - [0:0]
-A INPUT -p icmp -m icmp --icmp-type 8 -m limit --limit 10/min -m comment --comment "Throttle pings to 10/m" -j ACCEPT
-A INPUT -p icmp -m icmp --icmp-type 8 -m comment --comment "Drop pings over threshold" -j DROP
-A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -m comment --comment "Allow all established connections" -j ACCEPT
-A INPUT -i lo -m comment --comment "Allow loopback traffic" -j ACCEPT
-A INPUT -m conntrack --ctstate INVALID -m comment --comment "Drop invalid packets" -j DROP
-A INPUT -p tcp -m conntrack --ctstate NEW -m comment --comment "Pass TCP traffic to FILTER chain" -j FILTER
-A INPUT -p udp -m conntrack --ctstate NEW -m comment --comment "Pass UDP traffic to FILTER chain" -j FILTER
-A INPUT -m comment --comment "Reject other protocols" -j REJECT --reject-with icmp-proto-unreachable
-A FILTER -p tcp -m recent --update --seconds 60 --name BLACKLIST --rsource -m comment --comment "Block SYN scans" -j REJECT --reject-with tcp-reset
-A FILTER -p udp -m recent --update --seconds 60 --name BLACKLIST --rsource -m comment --comment "Block UDP scans" -j REJECT --reject-with icmp-port-unreachable
-A FILTER -m comment --comment "Pass traffic to SERVICE chain to check for valid service port" -j SERVICE
-A FILTER -p tcp -m recent --set --name BLACKLIST --rsource -m comment --comment "Blacklist SYN scans" -j REJECT --reject-with tcp-reset
-A FILTER -p udp -m recent --set --name BLACKLIST --rsource -m comment --comment "Blacklist UDP scans" -j REJECT --reject-with icmp-port-unreachable
-A LOGDROP -j LOG
-A LOGDROP -j DROP
-A SERVICE -i venet0 -p tcp -m tcp --dport 1984 -m comment --comment "Pass SSH to SSH chain" -j SSH
-A SERVICE -i venet0 -p tcp -m tcp --dport 443 -m comment --comment "Allow data HTTPS on 443" -j ACCEPT
-A SSH -m recent --rcheck --seconds 15 --hitcount 3 --rttl --name BRUTEFORCE --rsource -m comment --comment "Block SSH > 3 in 15s" -j LOGDROP
-A SSH -m recent --rcheck --seconds 900 --hitcount 10 --rttl --name BRUTEFORCE --rsource -m comment --comment "Block SSH > 10 in 900s" -j LOGDROP
-A SSH -m recent --set --name BRUTEFORCE --rsource -m comment --comment "Allow SSH not blacklisted" -j ACCEPT
COMMIT
# Completed on Sat Jul  8 11:48:38 2017

SSH는 TCP INPUT에서 tcp FILTER 체인으로 전달된 다음 SERVICE 체인, 그런 다음 SSH 체인으로 전달됩니다. 이론적으로 모든 SSH 실패가 설정에 따라 제거되고 기록되어야 합니까?

SSH를 통해 호스트에 연결하고 잘못된 루트 비밀번호를 계속 입력하면 거부되기 전에 3번 또는 15번의 옵션 대신 6번의 시도가 허용됩니까?

위의 규칙에 따라 SSH 체인 설정이 올바른가요, 아니면 뭔가 빠졌나요?

감사해요