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Port Scan how to hide your ports

#1 Guest_izy_*

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Posted 14 October 2003 - 07:51 PM

how can i make my ports invisible to an port scan .. and my server to don`t have ping on ping -t ip .. can anyone help me?
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#2 Guest_coder_*

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Posted 15 October 2003 - 04:06 AM

hey, firewalls help a lot when trying to defeat scans...

What OS? Are you running a firewall? You SHould!


Tell us what OS/Firewall you're running- then maybe we can help <_<

If you are running IPTABLES, here are some cool rules...
(taken from tge neohapsis archives...)

> * iptables -A INPUT -p icmp --icmp-type 8 -j REJECT --reject-with
> host-unreach
>
> Prevents people from pinging me without crippling my ability to
> ping/traceroute other people. Mainly this is just a minor annoyance for
> people trying to portscan me with programs like nmap that ping the host
> first, they just have to add -P0 and try again. Then again, this might
> stop some really stupid script kiddies. I'm thinking about setting up a
> similar rule that would log people who ping me, just for fun.

> * iptables -A INPUT -i eth0 -f -j REJECT --reject-with host-unreach
>
> Just drops fragments. I'm not really an expert on this, but I heard that
> fragments can be used maliciously (in port scans and such) and have little
> to no valid use nowadays, so I thought it might be smart to block them.
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#3 User is offline   packet 

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Posted 15 October 2003 - 04:32 AM

Don't get me started on fragments and MTU and all that jazz. Just to note, you can still see valid fragments today as a result of modem users and whatnot. They are just less common. Most good firewalls and IDS systems will automatically reassemble packets and drop/log them if something weird is going on.

--P.G>>
Abusus non tolit usum
The gopher is back!
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