- Set max-udp-size default to 1232. This is the same default value as

- Set max-udp-size default to 1232. This is the same default value as
  the default value for edns-buffer-size. It restricts client edns
  buffer size choices, and makes unbound behave similar to other DNS
  resolvers. The new choice, down from 4096 means it is harder to get
  large responses from Unbound. Thanks to Xiang Li, from NISL Lab,
  Tsinghua University.