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ipchains question

Hello all,

i have a little question about ipchains.
Does it make sense to block all incoming packets with the syn bit set
ipchains -A input -d $localhost 1025:65535 -y -p tcp -i ippp0  -j DENY ?
Or will this hurt some non harmful connections too?
Another question about this:
What applications usually try to open a connection from outside?
Thanks for your help.


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