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Re: iptables problem



tamer amr wrote:
thank for replay
but i still cant understand the difference frist i made 1 ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED
2    ACCEPT     tcp  --  anywhere        anywhere    state NEW tcp dpt:ssh
 here i can ssh the host

 then i removed the seconed rule to be
1 ACCEPT all -- anywhere anywhere state RELATED,ESTABLISHED

here i cound not ssh this host


i can't understand the logic can you explain me why in the frist state i cant ssh and in the second i can't

"Gaddis, Jeremy L." <jeremy linuxwiz net> wrote: On 1/18/07, tamer amr wrote:
hi i have a strang problem
 why any host can ssh me in the first list  but  can't in the second list

 please i want to understand this case

Seeing as how the only difference between the two is a single rule, I
would hope it's obvious where you should be looking.

 2    ACCEPT     tcp  --  anywhere             anywhere            state NEW tcp dpt:ssh

In the first list, you're explicitly allowing "NEW" connection to the
"ssh" port in.  In the second list, you're simply allowing traffic for
any already "ESTABLISHED" connections.

Please tell me this makes sense to you.

You might understand if you'd try to learn what related, established, new, state, tcp, dpt and ssh means. After you will do this the second rule will become a humanly readable sentence.



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