hI all I noticed the initial advertised EDNS UDP buffer size has been set to 512 from bind 9.10.0 (the commit is 8e15d5eb3a000f1341e6bea0ddbc28d6dd2a0591。 after bind started, bind must fallback to use tcp to query root server & gtld server, as the EDNS response for root server & gtld server is bigger than 512。 this result in the excessive use of TCP at boot time, and result in lone recursive query time。 I think 4096 is more better than 512 for initial advertised edns udp buffer size 。even if some firewalls block packets that are greater than 512 byte, the edn udp buffer size will fallback to 512，and the recursive query time is short than using tcp. _______________________________________________ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list
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