Testing flood attack on my server but still server working

[niraj_vara]

Hi

I was checking my server security and therefore I was trying to flood on my server

hping3 -V -c 1000000 -d 120 -S -w 64 -p 443 -s 445 --flood XXXXXXXX123


Remote server xxxxxxxx123 received the flood also on 443 port but still I am able to access the webserver and server xxxxxxxx123 is not down.
see the below packet received on 443 port

Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
78M 7250M ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 ctstate RELATED,ESTABLISHED
3918 352K DROP icmp -- * * 0.0.0.0/0 0.0.0.0/0
18 912 ACCEPT all -- lo * 0.0.0.0/0 0.0.0.0/0
2 104 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 ctstate NEW tcp dpt:8231
10 496 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:80
2564K 210M ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:443
0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:3690
202 13748 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited

Why after so much flooded on 443 thenafter that web server is working why its not go down ???