Re: Host timeouts on large SYN scans

[pierre.lalet () cea fr]

Hello

I've just noticed that this behaviour also affects the next ping scan 
and continues after it :

$ grep -E '<task(begin|end) task="(SYN|Ping)' log.xml
<taskbegin task="Ping Scan" time="1348472434"/>
<taskend task="Ping Scan" time="1348472973" extrainfo="4096 total hosts"/>
<taskbegin task="SYN Stealth Scan" time="1348472973"/>
<taskend task="SYN Stealth Scan" time="1348472975" extrainfo="4000 total 
ports"/>
<taskbegin task="SYN Stealth Scan" time="1348473114"/>
<taskend task="SYN Stealth Scan" time="1348473539" extrainfo="1 host 
timed out"/>
<taskbegin task="SYN Stealth Scan" time="1348475230"/>
<taskend task="SYN Stealth Scan" time="1348475300" extrainfo="64000 
total ports"/>
<taskbegin task="SYN Stealth Scan" time="1348476424"/>
<taskend task="SYN Stealth Scan" time="1348476451" extrainfo="64000 
total ports"/>
<taskbegin task="SYN Stealth Scan" time="1348477681"/>
<taskend task="SYN Stealth Scan" time="1348477703" extrainfo="64000 
total ports"/>
<taskbegin task="SYN Stealth Scan" time="1348478885"/>
<taskend task="SYN Stealth Scan" time="1348478963" extrainfo="64000 
total ports"/>
<taskbegin task="Ping Scan" time="1348480060"/>
<taskend task="Ping Scan" time="1348480930" extrainfo="4096 total hosts"/>
<taskbegin task="SYN Stealth Scan" time="1348480930"/>
<taskend task="SYN Stealth Scan" time="1348480953" extrainfo="64000 
total ports"/>
<taskbegin task="SYN Stealth Scan" time="1348482185"/>
<taskend task="SYN Stealth Scan" time="1348482205" extrainfo="64000 
total ports"/>
<taskbegin task="SYN Stealth Scan" time="1348483324"/>
<taskend task="SYN Stealth Scan" time="1348484218" extrainfo="1 host 
timed out"/>
<taskbegin task="SYN Stealth Scan" time="1348485433"/>
<taskend task="SYN Stealth Scan" time="1348486366" extrainfo="64 hosts 
timed out"/>
<taskbegin task="SYN Stealth Scan" time="1348486622"/>
<taskend task="SYN Stealth Scan" time="1348487498" extrainfo="64 hosts 
timed out"/>
<taskbegin task="Ping Scan" time="1348489421"/>
<taskend task="Ping Scan" time="1348490397" extrainfo="3347 hosts timed 
out"/>
<taskbegin task="SYN Stealth Scan" time="1348490397"/>
<taskend task="SYN Stealth Scan" time="1348491398" extrainfo="64 hosts 
timed out"/>
<taskbegin task="SYN Stealth Scan" time="1348492921"/>
<taskend task="SYN Stealth Scan" time="1348493798" extrainfo="64 hosts 
timed out"/>

Pierre

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