nanog mailing list archives
Re: ISP port blocking practice
From: Owen DeLong <owen () delong com>
Date: Thu, 22 Oct 2009 20:51:09 -0700
On Oct 22, 2009, at 4:14 PM, Lyndon Nerenberg (VE6BBM/VE7TFX) wrote:
Wow... That's evil. Most ISPs I've dealt with don't have that problem, but,Few companies use the MSP port (tcp/587).Can you elaborate. Is this based on analysis you've conducted on your own network? And if so, is the data (anonymized) available for the rest of us to look at? My experience is that port 587 isn't used because ISPs block it out-of-hand. Or in the case of Rogers in (at least) Vancouver, hijack it with a proxy that filters out the AUTH parts of the EHLO response, making the whole point of using the submission service ... pointless. --lyndon
if I encountered one that did, I'd vote with my feet in short order. Owen
Current thread:
- Re: ISP port blocking practice, (continued)
- Re: ISP port blocking practice Lyndon Nerenberg (VE6BBM/VE7TFX) (Oct 22)
- Re: ISP port blocking practice Sean Donelan (Oct 22)
- Re: ISP port blocking practice Joe Maimon (Oct 22)
- Re: ISP port blocking practice Steve Bertrand (Oct 22)
- Re: ISP port blocking practice Lyndon Nerenberg (VE6BBM/VE7TFX) (Oct 23)
- Re: ISP port blocking practice Chris Boyd (Oct 23)
- Re: ISP port blocking practice Lyndon Nerenberg (VE6BBM/VE7TFX) (Oct 22)
- Re: ISP port blocking practice Justin Shore (Oct 22)
- Re: ISP port blocking practice Joe Maimon (Oct 22)
- Re: ISP port blocking practice Justin Shore (Oct 22)
- Re: ISP port blocking practice Scott Howard (Oct 22)
- Re: ISP port blocking practice Owen DeLong (Oct 22)
- Re: ISP port blocking practice Chris Boyd (Oct 23)
- Re: ISP port blocking practice Jack Bates (Oct 23)
- Re: ISP port blocking practice Steve Bertrand (Oct 23)
- Re: ISP port blocking practice Michael Peddemors (Oct 23)
- Re: ISP port blocking practice Steve Bertrand (Oct 23)
- Re: ISP port blocking practice JC Dill (Oct 24)
- Re: ISP port blocking practice Justin Shore (Oct 23)
- Re: ISP port blocking practice Lee Riemer (Oct 23)
- Re: ISP port blocking practice James R. Cutler (Oct 23)