nanog mailing list archives
Re: short Botnet list and Cashing in on DoS
From: "Stephen J. Wilcox" <steve () telecomplete co uk>
Date: Sat, 9 Oct 2004 20:25:53 +0100 (BST)
On Sat, 9 Oct 2004, Gadi Evron wrote:
there are many ways of sending spam that dont use port 25..True, but reducing spam from millions to thousands seems like something good, no?
their market wont change tho, you will just force them to use another method.. at one time open relays were almost exclusively the way used to send spam, now they arent nearly as popular (or available) you can see the same with other problems eg dos attacks were once all smurfs, a lot of effort was put into removing amplifiers and now we have the botnets.. i'm not saying do nothing, just only do things which make sense and are practical
individual rules are costly to implement and users wont use a service where you have to pay more for basic servicesSeveral big ISP's are blocking port 25 now. I believe this will catch.
we need to look at some examples and what theyre doing exactly.. some redirect it forcibly to their own servers. but i believe this approach is limited in how you can apply it.. someone like aol can pretty well classify their users as low end residential and thats fine ... but move away from this and special requirements start creeping in and exceptions are not scalable enough.
It limits the amount of junk coming out from their users, and the usage of their tubes. I doubt even 0.001% of dynamic range Cable/DSL users will ever call to ask for port 25 to be opened.
i'd suggest your estimate is too low based on all end users
This is something ISP's can implement, and it works.
this is something *some* isps can do ... and i'm not arguing that we shouldnt do these little things but its just one limited way and serves more to reduce problems with your own users than to reduce inbound spam Steve
Current thread:
- Re: short Botnet list and Cashing in on DoS, (continued)
- Re: short Botnet list and Cashing in on DoS Mark Andrews (Oct 10)
- Re: short Botnet list and Cashing in on DoS James Baldwin (Oct 10)
- Re: short Botnet list and Cashing in on DoS Alexei Roudnev (Oct 10)
- BCP38 making it work, solving problems Sean Donelan (Oct 10)
- Re: BCP38 making it work, solving problems Edward B. Dreger (Oct 11)
- Re: short Botnet list and Cashing in on DoS Bill Stewart (Oct 11)
- Re: short Botnet list and Cashing in on DoS Edward B. Dreger (Oct 11)
- Re: short Botnet list and Cashing in on DoS David Lesher (Oct 09)
- Re: short Botnet list and Cashing in on DoS Stephen J. Wilcox (Oct 09)
- Re: short Botnet list and Cashing in on DoS Gadi Evron (Oct 09)
- Re: short Botnet list and Cashing in on DoS Stephen J. Wilcox (Oct 09)
- Re: short Botnet list and Cashing in on DoS Paul Vixie (Oct 09)
- Re: short Botnet list and Cashing in on DoS Alexei Roudnev (Oct 09)
- Re: short Botnet list and Cashing in on DoS Petri Helenius (Oct 09)
- Re: short Botnet list and Cashing in on DoS Michael . Dillon (Oct 11)
- Re: short Botnet list and Cashing in on DoS John Kristoff (Oct 22)