-----Original Message----- From: Jochem van Dieten [mailto:[EMAIL PROTECTED] Sent: 08 January 2006 22:22 To: CF-Talk Subject: Re: SPF? How to use?
Jennifer Gavin-Wear wrote: > I'll have to kick the people who wrote my TPC/IP manual then, and as of when > I did sample tests for MCSE they also have the Class addresses wrong! >>Makes you wonder if there isn't some truth to all the jokes about >>Minesweeper Consultants and Solitaire Experts :) Well, the MS tcp/ip course shows the MS way of tcp/ip with the usual lashing of MS bs. However, I am surprised the comprehensive 500+ page independently written tcp/ip manual I have is wrong. > Whether you control the DHCP server or not you would still have to delecare > the IP address range in firewall and mail server configs. >> If you control the DHCP server you can make sure the host you want to allow access gets a very specific IP address that has certain rules that don't apply to other IP addresses. Effectively a static IP to which you would apply firewall and mail server rules in the usual way. >>But to get back on topic. Most ISPs use DHCP to assign IP addresses to customers. Even if these IP addresses are semi static (based on some form of option 82), these IPs are not identifiable for outsiders through the normal ARIN / RIPE etc registries like larger direct assignments are. Since about 80% of spam originates from hacked/infected end-users, some DNS RBLs list these DHCP addresses for pre-emptive blocking since they are mainly end-users anyway. That is the relevance of DHCP in spam blocking. I didn't know the RBL's were blocking whole address ranges, that's pretty scary if you ask me! I can't find any evidence of this on a quick search, you know where it's happening? I'm also interested in where the spam stats come from? Jenny ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| Message: http://www.houseoffusion.com/lists.cfm/link=i:4:228799 Archives: http://www.houseoffusion.com/cf_lists/threads.cfm/4 Subscription: http://www.houseoffusion.com/lists.cfm/link=s:4 Unsubscribe: http://www.houseoffusion.com/cf_lists/unsubscribe.cfm?user=89.70.4 Donations & Support: http://www.houseoffusion.com/tiny.cfm/54
