where to go to understand DDoS attack vector

Roland Dobbins rdobbins at arbor.net
Tue Aug 26 13:58:08 UTC 2014


On Aug 26, 2014, at 8:37 PM, John York <johny at griffintechnology.com> wrote:

> In this case, 17 is both the protocol and port number. Confusing coincidence :)

Not in this output which the OP sent to the list:

> 8:33:58.482193 IP (tos 0x0, ttl 56, id 0, offset 0, flags [DF], proto UDP (17), length 29) x.x.x.x.2072 > x.x.x.x.27015: UDP, length 1
>                0x0000: 4500 001d 0000 4000 3811 088c cf9a 3b8c E..... at .8 <mailto:E..... at .8>.....;.
>                0x0010: 405e eebf 0818 6987 0009 10f8 4300 0000 @^....i.....C...
>                0x0020: 0000 0000 0000 0000 0000 0000 0000       ..............


> 18:33:58.482193 IP (tos 0x0, ttl 56, id 0, offset 0, flags [DF], proto UDP (17), length 29) x.x.x.x.2072 > x.x.x.x.27015: UDP, length 1
>                0x0000: 4500 001d 0000 4000 3811 088c cf9a 3b8c E..... at .8 <mailto:E..... at .8>.....;.
>                0x0010: 405e eebf 0818 6987 0009 10f8 4300 0000 @^....i.....C...
>                0x0020: 0000 0000 0000 0000 0000 0000 0000       ..............
> 18:33:58.484625 IP (tos 0x0, ttl 56, id 0, offset 0, flags [DF], proto UDP (17), length 29) x.x.x.x.2072 > x.x.x.x.27015: UDP, length 1
>                0x0000: 4500 001d 0000 4000 3811 088c cf9a 3b8c E..... at .8 <mailto:E..... at .8>.....;.
>                0x0010: 405e eebf 0818 6987 0009 10f8 4300 0000 @^....i.....C...
>                0x0020: 0000 0000 0000 0000 0000 0000 0000       ..............
> 18:33:58.486137 IP (tos 0x0, ttl 56, id 0, offset 0, flags [DF], proto UDP (17), length 29) x.x.x.x.2072 > x.x.x.x.27015: UDP, length 1
>                0x0000: 4500 001d 0000 4000 3811 088c cf9a 3b8c E..... at .8 <mailto:E..... at .8>.....;.
>                0x0010: 405e eebf 0818 6987 0009 10f8 4300 0000 @^....i.....C...
>                0x0020: 0000 0000 0000 0000 0000 0000 0000       ..............

Source port 2072, destination port 27015.

----------------------------------------------------------------------
Roland Dobbins <rdobbins at arbor.net> // <http://www.arbornetworks.com>

                   Equo ne credite, Teucri.

    		   	  -- Laoco├Ân



More information about the NANOG mailing list