Hello, Are there some ISPs who filter prefixes longer than /19 or a /20?. I thought they filtered only prefixes which are longer than /24? Harsha.
If the space is from what was originally class a or b, there are some that will filter based on that. An ex employer of mine did that. Bri ----- Original Message ----- From: "Harsha Narayan" <hnarayan@cs.ucsd.edu> To: <nanog@merit.edu> Sent: Wednesday, November 13, 2002 8:53 AM
Hello,
Are there some ISPs who filter prefixes longer than /19 or a /20?. I thought they filtered only prefixes which are longer than /24?
Harsha.
Most notably verio does this. http://info.us.bb.verio.net/routing.html --Phil -----Original Message----- From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu] On Behalf Of Brian Sent: Wednesday, November 13, 2002 1:17 PM To: Harsha Narayan; nanog@merit.edu Subject: Re: If the space is from what was originally class a or b, there are some that will filter based on that. An ex employer of mine did that. Bri ----- Original Message ----- From: "Harsha Narayan" <hnarayan@cs.ucsd.edu> To: <nanog@merit.edu> Sent: Wednesday, November 13, 2002 8:53 AM
Hello,
Are there some ISPs who filter prefixes longer than /19 or a /20?. I thought they filtered only prefixes which are longer than /24?
Harsha.
Harsha, Yes we do (Swisscom IP-Plus AS3303). We filter on RIR minimal allocations and anything longer than /21 within historical A/B space André ----- Original Message ----- From: "Harsha Narayan" <hnarayan@cs.ucsd.edu> To: <nanog@merit.edu> Sent: Wednesday, November 13, 2002 5:53 PM
Hello,
Are there some ISPs who filter prefixes longer than /19 or a /20?. I thought they filtered only prefixes which are longer than /24?
Harsha.
participants (4)
-
Andre Chapuis -
Brian -
Harsha Narayan -
Phil Rosenthal