echo scans

[exit <exit () RANDOMKEYSTROKES COM>]

Hi, I have a lan of linux boxes, and get a relatively low volume of
portscans. But last night i have recieved an unsual amount from
different sources.
I am wondering if i should be worried about scans to tcp and udp port 7
[echo], this particular scan lasted for 4minutes on all machines at the
same time.

Also i will list strings of ports below (in order of scan), each string
came from one ipadress, does anyone recognise a pattern here or is it
random ? , all ports were _udp_ , thanks in advance. (along with this i
got the usual probes for port 80 + 21)

2443, 53, 516, 511, 162, 111, 109

633, 987, 171, 241, 848, 278, 700, 119, 899, 317

196, 909, 129, 128, 883, 840, 904, 553, 177, 679, 803, 106, 418, 340,
126, 635, 373, 834

90, 959, 545, 217, 187, 1011, 967, 677, 19, 630, 858, 758

538, 949, 818, 642, 711

905, 873, 562, 317, 764, 637, 280, 378

881, 191, 688

then the 4 minute scan on tcp/udp port 7.

Regards.