»-----Original Message----- »From: IMail_Forum-owner@list.ipswitch.com »[mailto:IMail_Forum-owner@list.ipswitch.com]On Behalf Of dk »Sent: Sunday, December 10, 2000 9:00 PM »To: IMail_Forum@list.ipswitch.com »Subject: RE: [IMail Forum] server attack-- blocking ip addresses » » » »How would I totaly block » »63.xx.xx.xx ?? » » » » » »> »> »> > If an Ip address that I want to block are for example »> »> > 63.20.67.64 63.20.63.138 »> »> > How would I block all 254 systems? »> > Would I use 63.20.60.0 for the ip to block and »255.255.255.0 for the »> subnet? »> »> Actually, the example above would be 65,536 IPs (63.20.x.x). »> »> If you wanted to block all IPs from 63.20.67.x, you would use »> 63.20.67.0 and »> a netblock of 255.255.255.0. »> »> If you wanted to block all IPs from 63.20.67.x and 63.20.63.x, »> you would use »> 63.20.67.0 with a netblock of 255.255.255.0 *and* 63.20.63.0 with »> a netblock »> of 255.255.255.0. »> »> If you want to block all IPs from 63.20.x.x, you would use »63.20.0.0 and a »> netblock of 255.255.0.0. But, that will block a lot of computers »> -- be sure »> to look up to see what companies own those IP addresses »before doing that. »> It could be that you are blocking lots of small ISPs, for »> example, or small »> businesses with class Cs. In reality, it appears that those »are both IPs »> from a huge block of IPs that UUNet uses for dialup »accounts. Blocking »> those will block lots of people (although probably mostly »dialups, which »> wouldn't be much of a problem, unless they have static IPs). »> -Scott »> »> Declude: Anti-spam and Anti-virus solutions for IMail. »> http://www.declude.com »> »> »> »> »> »> »> »> »> »> »> » » »PS- Come by http://florida.com for all your Florida needs!! » » » » »