nanog mailing list archives
Re: IPv4 ANYCAST setup
From: Valdis.Kletnieks () vt edu
Date: Fri, 26 Mar 2010 09:52:48 -0400
On Fri, 26 Mar 2010 09:40:39 EDT, Max Larson Henry said:
- Yes but as for DNS, anycast is essentially used for user requests (UDP) not to perform zone transfer(TCP).
DNS uses TCP for more than just XFR. For instance, if you're running a resolver that doesn't do EDNS0, and you hit an (increasingly common) DNSSEC signed reply, it's going to be over 512 bytes and the lack of EDNS0 will cause it to re-ask via TCP. Just mentioning it because the sort of sites that think TCP==XFR are the sort most likely to be running firewalls that munch the EDNS0 bits, and are setting themselves up for big surprises in the very near future.
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Current thread:
- IPv4 ANYCAST setup InterNetX - Lutz Muehlig (Mar 26)
- Re: IPv4 ANYCAST setup Jeroen Massar (Mar 26)
- Re: IPv4 ANYCAST setup Max Larson Henry (Mar 26)
- RE: IPv4 ANYCAST setup Paul Ryland (Mar 26)
- Re: IPv4 ANYCAST setup Valdis . Kletnieks (Mar 26)
- Re: IPv4 ANYCAST setup Mark Andrews (Mar 26)
- Re: IPv4 ANYCAST setup Jeroen Massar (Mar 26)
- Re: IPv4 ANYCAST setup Owen DeLong (Mar 26)
- Re: IPv4 ANYCAST setup Joe Abley (Mar 26)
- Re: IPv4 ANYCAST setup Max Larson Henry (Mar 26)
- Re: IPv4 ANYCAST setup Jeroen Massar (Mar 26)
- Re: IPv4 ANYCAST setup Owen DeLong (Mar 26)
- Re: IPv4 ANYCAST setup Joe Abley (Mar 26)
- Re: IPv4 ANYCAST setup Kevin Oberman (Mar 29)
- Re: IPv4 ANYCAST setup Randy Bush (Mar 29)
- Re: IPv4 ANYCAST setup Tony Finch (Mar 30)
- Re: IPv4 ANYCAST setup Randy Bush (Mar 30)