nanog mailing list archives
Re: ISP port blocking practice
From: "James R. Cutler" <james.cutler () consultant com>
Date: Fri, 23 Oct 2009 19:33:58 -0400
No, blocking a port does not restrict a customers use of the network any more than one way streets restrict access to downtown stores. It just forces certain traffic directions in a bicycle/motorcycle/car/van/ truck neutral manner. Carry anything you want. Others laws restrict incendiary content.
On Oct 23, 2009, at 6:15 PM, Dan White wrote:
On 23/10/09 17:58 -0400, James R. Cutler wrote:Blocking the well known port 25 does not block sending of mail. Or themessage content.It does block incoming SMTP traffic on that well known port.I think the relevant neutrality principle is that traffic is not blockedby content.My personal definition doesn't quite gel with that. You're deciding for the customer how they can use their connection, before you have any evidence ofnefarious activity.Would you consider restricting a customer's outgoing port 25 traffic to aspecific mail server a step over the net neutrality line? -- Dan White
James R. Cutler james.cutler () consultant com
Current thread:
- Re: ISP port blocking practice, (continued)
- 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)
- Re: ISP port blocking practice Dan White (Oct 23)
- Re: ISP port blocking practice Justin Shore (Oct 23)
- Re: ISP port blocking practice Dan White (Oct 23)
- Re: ISP port blocking practice Owen DeLong (Oct 23)
- Re: ISP port blocking practice Patrick W. Gilmore (Oct 24)
- Re: ISP port blocking practice Clue Store (Oct 24)
- Re: ISP port blocking practice James Hess (Oct 23)
- Re: ISP port blocking practice James R. Cutler (Oct 23)
- Re: ISP port blocking practice Patrick W. Gilmore (Oct 23)
- Re: ISP port blocking practice Owen DeLong (Oct 23)
- Re: ISP port blocking practice Joe Greco (Oct 24)
- Re: ISP port blocking practice Owen DeLong (Oct 24)
- Re: ISP port blocking practice Joe Greco (Oct 24)
- Re: ingress filtering and multiple Internet conenctions Joe Maimon (Oct 25)
- Re: ingress filtering and multiple Internet conenctions Joe Greco (Oct 25)
- Re: ingress filtering and multiple Internet conenctions Joe Maimon (Oct 25)
- Re: ingress filtering and multiple Internet conenctions Owen DeLong (Oct 25)
- Re: ingress filtering and multiple Internet conenctions Owen DeLong (Oct 25)