Difference between revisions of "Talk:Port knocking"

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(Merge tag with iptables: re)
m (Remove closed discussion.)
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For me the supplied script did not work.
Instead of
nmap -P0 --host_timeout 201 -p $2 $1 &> /dev/null
nmap -P0 --host_timeout 201 -p $3 $1 &> /dev/null
I use
nmap -PN --host_timeout 201 --max-retries 0 -p $2 $1 &> /dev/null
nmap -PN --host_timeout 201 --max-retries 0 -p $3 $1 &> /dev/null
The Flag P0 seems to have been renamed to PN in a more recent nmap version.
But the important part is max-retries. If it is not set to 0 nmap sends several TCP SYN packets to the target host. This then causes serveral knocks on Port 1 and 2 instead of just one - thus knocking 'out of order'.
Please edit if you agree - I'm not an 'expert' by all means, this are just my thoughts after examining iptables logs.
I'll edit the page in a few days if there is no respone - I just wanted to have feedback before I do.
==Merge tag with iptables==
Hi, I would not merge this to iptables. Three reasons: (1) Iptables is a massive topic. It's basics are hard enough to cover on one page. (2) This here is pretty specialised and only few users will ever have contact with the concept of port knocking. It's likely out-of-bounds on the main page. (3) More adequate imo would be a merge to the stateful-firewall page (port knocking with iptables is great, but boils down to advanced state handling). But that is too large itself and has a small section regarding knockd (maybe that bit could be merged here?).
I think it would be enough to link the pages together a bit more. Thoughts? --[[User:Indigo|Indigo]] ([[User talk:Indigo|talk]]) 19:30, 11 August 2013 (UTC)
:I just don't like the current state, it seems it could use merging into some page with better context (you're absolutely right about [[Simple Stateful Firewall]]). But, if this page is rewritten to be more like a guide and not just presenting a (commented) config file, then it could be useful standalone page. (Perhaps I should have added a 'Poor writing' tag instead of 'Merge'.) -- [[User:Lahwaacz|Lahwaacz]] ([[User talk:Lahwaacz|talk]]) 08:34, 12 August 2013 (UTC)

Revision as of 13:39, 27 August 2013