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jacques 10-02-2011 10:07 PM

kernel: TCP: drop open request :: Do I have to worry about ?
 
Hello,


from time to time log spits :

Oct 2 23:25:11 gordo kernel: [501679.617067] TCP: drop open request
from ip.ip.ip.ip/1979
Oct 2 23:25:11 gordo kernel: [501679.639032] TCP: drop open request
from ip.ip.ip.ip/1980
Oct 2 23:25:11 gordo kernel: [501679.639044] TCP: drop open request
from ip.ip.ip.ip/1981
Oct 2 23:25:11 gordo kernel: [501679.639053] TCP: drop open request
from ip.ip.ip.ip/1982


several line sof it. ip.ip.ip.ip is not the real string ;)

Do I have to worry about and consider to process these messages ?


Thnaks, Jacques


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Henrique de Moraes Holschuh 10-02-2011 11:52 PM

kernel: TCP: drop open request :: Do I have to worry about ?
 
On Mon, 03 Oct 2011, jacques wrote:
> from time to time log spits :
>
> Oct 2 23:25:11 gordo kernel: [501679.617067] TCP: drop open request
> from ip.ip.ip.ip/1979
> Oct 2 23:25:11 gordo kernel: [501679.639032] TCP: drop open request
> from ip.ip.ip.ip/1980
> Oct 2 23:25:11 gordo kernel: [501679.639044] TCP: drop open request
> from ip.ip.ip.ip/1981
> Oct 2 23:25:11 gordo kernel: [501679.639053] TCP: drop open request
> from ip.ip.ip.ip/1982
>
> several line sof it. ip.ip.ip.ip is not the real string ;)
>
> Do I have to worry about and consider to process these messages ?

Enable SYN cookies, and check whether you have tuned your TCP stack well
enough for your normal load...

http://e-mats.org/2010/01/tcp-drop-open-request-from/
http://blog.blacknode.net/2008/03/tcp-drop-open-request-from-xxxxxxxxxxxx/

--
"One disk to rule them all, One disk to find them. One disk to bring
them all and in the darkness grind them. In the Land of Redmond
where the shadows lie." -- The Silicon Valley Tarot
Henrique Holschuh


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