[Date Prev][Date Next] [Thread Prev][Thread Next] [Date Index] [Thread Index]

Re: NULL Scan issues or something else?

Le 07/02/2013 19:34, Daniel Curtis a écrit :

Thank you all for your answers. They are very helpful.
I have to mention some thing, which I forgot to write;

  * no running services
  * all ports are closed (according to e.g. nmap)
  * iptables has concerning rules about /INVALID/ packets
  * flags filtering for /--tcp-flags /and use /--ctstate/.

Now this computer is used for a various test etc. Maybe, in
the future this machine will be something else, more important.
So, should I afraid of these scans attempts, despite that, there
are _not enabled_ any service? Blocking (/DROP/) these connections
is sufficient? In that case, what is the type of scan, that uses these

Why this type of scan occurs when all ports are closedand none of
the services are not running? Sorry for the naive question, but I'm
surprised, because I was never in a similar situation. Especially with
closed ports and no services.

Again sorry for so many questions, and thanks for all the answers.
If you can, please answer to the above questions. They are very
important for me.

*Some part of the log:
*SCAN: IN=eth0 OUT= MAC=_mac_addresses
SRC= DST=192.168.10.X
LEN=1500 TOS=0x00 PREC=0x00
TTL=52 ID=14512 DF

...and many more...

Best regards!

To me it looks like an acknowledgement of a packet you sent to the web server on bendel.debian.org ML and archive server for debian...

Nothing that should bother you.

Reply to: