nanog mailing list archives
Re: Smaller than a /24 for BGP?
From: William Herrin <bill () herrin us>
Date: Sat, 28 Jan 2023 22:17:07 -0800
On Sat, Jan 28, 2023 at 5:48 PM Masataka Ohta <mohta () necom830 hpcl titech ac jp> wrote:
The following way in my ID: The easiest way for applications know all the addresses of the destination is to use DNS. With DNS reverse, followed by forward, lookup, applications can get a list of all the addresses of the destination from an address of the destination.
The DNS provides no such guarantee. Moreover, the DNS does guarantee its information to be correct until the TTL expires, making it unsuitable for communicating address information which may change sooner.
As for (long lasting) TCP, my ID says: With TCP, applications must be able to pass multiple addresses to transport layer (e.g. BSD socket). which implies addresses are supplied from applications by DNS look up.
Which is a bit of hand-waving since the protocol can't do anything with that information regardless of whether you expand the API to provide it. Even if it could, you also miss the point that the information -may change- during the ongoing connection so you can't just statically retrieve it. Regards, Bill Herrin -- For hire. https://bill.herrin.us/resume/
Current thread:
- RE: Smaller than a /24 for BGP?, (continued)
- RE: Smaller than a /24 for BGP? Robert McKay (Jan 24)
- Re: Smaller than a /24 for BGP? John Levine (Jan 24)
- Re: Smaller than a /24 for BGP? Forrest Christian (List Account) (Jan 24)
- Re: Smaller than a /24 for BGP? Lars Prehn (Jan 25)
- Re: Smaller than a /24 for BGP? Masataka Ohta (Jan 27)
- Re: Smaller than a /24 for BGP? William Herrin (Jan 28)
- Re: Smaller than a /24 for BGP? Donald Eastlake (Jan 28)
- Re: Smaller than a /24 for BGP? William Herrin (Jan 28)
- Re: Smaller than a /24 for BGP? William Herrin (Jan 28)
- Re: Smaller than a /24 for BGP? Masataka Ohta (Jan 28)
- Re: Smaller than a /24 for BGP? William Herrin (Jan 28)
- Re: Smaller than a /24 for BGP? Masataka Ohta (Jan 28)
- Re: Smaller than a /24 for BGP? William Herrin (Jan 29)
- Re: Smaller than a /24 for BGP? Masataka Ohta (Jan 28)
- Re: Smaller than a /24 for BGP? Masataka Ohta (Jan 29)
- ROV concern for hyper-specific prefixes (renamed from `Re: Smaller than a /24 for BGP?') Amir Herzberg (Jan 30)
- Re: ROV concern for hyper-specific prefixes (renamed from `Re: Smaller than a /24 for BGP?') Tom Beecher (Jan 30)
- Re: ROV concern for hyper-specific prefixes (renamed from `Re: Smaller than a /24 for BGP?') Amir Herzberg (Jan 30)
- Re: Smaller than a /24 for BGP? Eric Kuhnke (Jan 25)
- Re: Smaller than a /24 for BGP? Jon Lewis (Jan 25)