Re: Syn flood to TCP port 21 from priveleged port (80)

[Oleg A. Arkhangelsky <sysoleg () yandex ru>]

Hello,

A couple of cuts from tcpdump output:

21:31:54.995170 IP 141.138.131.115.80 > 109.72.248.114.21: Flags [S], seq 1376379765, win 8192, length 0
21:31:55.231925 IP 194.73.173.154.80 > 109.72.241.198.21: Flags [S], seq 2254756684, win 8192, length 0
21:27:50.413927 IP 95.131.188.179.80 > 109.72.248.114.21: Flags [S], seq 3619475318, win 8192, length 0
21:27:50.477014 IP 95.131.191.77.80 > 109.72.248.114.21: Flags [S], seq 2412690982, win 8192, length 0

Does anyone seeing this right now (18:31 UTC)? I see this traffic
on at least two completely independent ISPs near Moscow. The
rate is about a few dozen PPS hitting all BGP-announced networks.

-- 
wbr, Oleg.

"Anarchy is about taking complete responsibility for yourself."
      Alan Moore.