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- iptables and nmap
April 16, 2005, 7:24 pm
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I'm trying to close some ports off by doing this for example..
iptables -A INPUT -p tcp --dport 12345 -j DROP
The problem is, if I do an nmap scan on the system they show up as
Are they really blocked from outsiders?
Is there a way of blocking them so that they don't even show up filtered
or otherwise by nmap?
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Re: iptables and nmap
Kindly look at the man page for iptables, and see what 'DROP' does, then
read the man page for nmap, and read what the third paragraph under
the header "DESCRIPTION" on the first page says.
Read the man page for nmap, and then use a tool like 'tcpdump' or 'ethereal'
or similar and watch the packet exchange when you use nmap to test that
port. Then, grab a copy of RFC1180 off the web, and study that. "stealth"
doesn't exist, and you just proved it.
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