19 May
2002
19 May
'02
12:13 p.m.
RD> I think that's pretty stupid. If I had my network admin investigate every RD> portscan, my staff costs would go up 10x and I'd quickly go bankrupt. RD> Instead we keep our servers very secure, and spend the time and effort RD> only when there is evidence of a break in.
I didn't say investigate every portscan, I said assume every portscan is hostile. There is a big difference.
So you assume it's hostile and do what? Automatically block the source IP? If you do that then you open up a bigger DOS hole. Then if someone sends a bunch of SYN scans with the source address spoofed as your upstream transit providers' BGP peering IP, poof! you're gone.