nanog mailing list archives
Re: ISP port blocking practice
From: Jack Bates <jbates () brightok net>
Date: Fri, 03 Sep 2010 09:03:19 -0500
Patrick W. Gilmore wrote:
Yes... Many of the idiots that block outbound 25 also block outbound 587 and sometimes 465.Could you point to more than one instance? I've not yet found one. And I think I spend at least as much time in hotels & 3G & airports & etc. as you anyone else here.
I can't remember the ISP, but yes, I've run across this. I had to have my helpdesk inform the customer that they'll have to complain and gripe at the ISP they were using or make other arrangements as I only support 25/587 (customer didn't want to use webmail).
Problem is, people hear "block ports", they get in the habit, and the next thing you know, they are blocking ports out of ignorance with no comprehension of what they are breaking.
I'd much rather see rate detection setups that let me send however I want, but limit the connections per time interval. It implies that some thought might go into determining the rates. Of course, the only setup I've done like this in testing in my network involved flow analyzers and dynamic acl's.
Jack
Current thread:
- Re: ISP port blocking practice, (continued)
- Re: ISP port blocking practice Daniel Senie (Sep 02)
- Re: ISP port blocking practice William Herrin (Sep 03)
- Re: ISP port blocking practice Dobbins, Roland (Sep 03)
- Re: ISP port blocking practice Dobbins, Roland (Sep 03)
- Re: ISP port blocking practice Owen DeLong (Sep 02)
- Re: ISP port blocking practice Patrick W. Gilmore (Sep 02)
- Re: ISP port blocking practice Jack Bates (Sep 02)
- Re: ISP port blocking practice Franck Martin (Sep 02)
- Re: ISP port blocking practice Owen DeLong (Sep 03)
- Re: ISP port blocking practice Patrick W. Gilmore (Sep 03)
- Re: ISP port blocking practice Jack Bates (Sep 03)
- Re: ISP port blocking practice JC Dill (Sep 03)
- Re: ISP port blocking practice Randy Bush (Sep 03)
- Re: ISP port blocking practice Nick Hilliard (Sep 03)
- Re: ISP port blocking practice Owen DeLong (Sep 03)
- Re: ISP port blocking practice Curtis Maurand (Sep 03)
- Re: ISP port blocking practice Dobbins, Roland (Sep 03)
- Re: ISP port blocking practice Kevin Oberman (Sep 04)
- Re: ISP port blocking practice Owen DeLong (Sep 03)
- Re: ISP port blocking practice Butch Evans (Sep 03)
- Re: ISP port blocking practice Owen DeLong (Sep 03)