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Re: Host timeouts on large SYN scans

On Mon, Sep 24, 2012 at 02:31:54PM +0200, pierre.lalet () cea fr wrote:

Hello,

When does this happen? Is it 15m after the start of the entire scan, or15m after the start of the hostgroup? Or something else?

This happens 15m after the start of the hostgroup.

Exactly, or whatever the --host-timeout value is.

Can you show us the rest of the command line you are using?

I let Pierre answer this, but this we could also observe without anytiming/performance related parameter.

Sure, we use :-vv -n -oX log.xml -iL - -PS -PA -PU -PE -PP -PO -sS -A --host-timeout 15mWe've also tried --host-timeout 60m with the same results.

Pierre kindly bisected this problem, and encoutnered some difficulties,but the evidence indicates that this is a new problem, and that therevision that introduced it is somewhere between r28648 and r29507.The only substantive change to scan_engine.cc in that range is r29051.Grepping for "timeout" finds r29215, which affects timeouts for NSEworker threads, however Pierre said that the problem is not withinaccurate timeout calculations, but with SYN scans becoming slow.David Fifield_______________________________________________Sent through the nmap-dev mailing listhttp://cgi.insecure.org/mailman/listinfo/nmap-devArchived athttp://seclists.org/nmap-dev/

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• Re: Host timeouts on large SYN scansDavid Fifield (Oct 03)