Shuffle the dns constant to dns.go

_examples/q/q.go

@@ -96,6 +96,10 @@ Flags:
 		if *nsid {
 			opt.SetNsid("")
 		}
+                println("Setting ", *tcp, dns.MaxMsgSize-1)
+                if *tcp {
+                        opt.SetUDPSize(dns.MaxMsgSize-1)
+                }
 		m.Extra = make([]dns.RR, 1)
 		m.Extra[0] = opt
 	}

dns.go

@@ -19,8 +19,11 @@ import (
 	"strconv"
 )
 
-// For RFC1982 (Serial Arithmetic) calculations in 32 bits.
-const Year68 = 2 << (32 - 1)
+const (
+	Year68         = 2 << (32 - 1) // For RFC1982 (Serial Arithmetic) calculations in 32 bits.
+	DefaultMsgSize = 4096          // A standard default for larger than 512 packets.
+	MaxMsgSize     = 65536         // Largest possible DNS packet.
+)
 
 // Error represents a DNS error
 type Error struct {

msg.go

@@ -26,9 +26,6 @@ import (
 	"encoding/hex"
 )
 
-// The size of the standard buffer.
-const DefaultMsgSize = 4096
-
 // A manually-unpacked version of (id, bits).
 // This is in its own struct for easy printing.
 type MsgHdr struct {