Query on –m option of iptables command

I have a query on the use of the –m option of iptables command in RHEL 6.0. I have seen commands like:
iptables –A INPUT –m state --state ESTABLISHED,RELATED –j ACCEPT
which makes quite good sense but the below command:
iptables –A PREROUTING -s 10.101.17.34 –d 10.101.15.84 –p tcp –m tcp --dport 443 –j REDIRECT –to-ports 30080
does not seem to be useful as tcp is already given against the –p option then what is the use of specifying –m option again with tcp. I am be wrong on this.
I hope my query is clear.
Please revert with the reply to my query.
Regards

Hi,
When we see the man command for iptables which is the manual reference.
# man 8 iptables
-m, --match match
Specifies a match to use, that is, an extension module that tests for a specific property. The set of matches make up the condition under which a target is invoked. Matches are evaluated first to last as specified on the command line and work in short-circuit fashion, i.e. if one extension yields false, evaluation will stop.
For more information, look at this URL.
The match can be: account , comment , connbytes , connlimit , ipv4options , osf, recent, set, tos, tcp, udp
For more information, look at this URL.
I hope this can help you
Best Regards

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