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net/dns: Increase UDP response buffer to 1232 bytes #51128

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net/dns: Increase UDP response buffer to 1232 bytes #51128

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2 changes: 1 addition & 1 deletion src/net/dnsclient_unix.go
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Original file line number Diff line number Diff line change
Expand Up @@ -82,7 +82,7 @@ func dnsPacketRoundTrip(c Conn, id uint16, query dnsmessage.Question, b []byte)
return dnsmessage.Parser{}, dnsmessage.Header{}, err
}

b = make([]byte, 512) // see RFC 1035
b = make([]byte, 1232) // see RFC 6891, https://dnsflagday.net/2020/
for {
n, err := c.Read(b)
if err != nil {
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2 changes: 1 addition & 1 deletion src/net/dnsclient_unix_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -881,7 +881,7 @@ func (f *fakeDNSPacketConn) Close() error {
func TestIgnoreDNSForgeries(t *testing.T) {
c, s := Pipe()
go func() {
b := make([]byte, 512)
b := make([]byte, 1232)
n, err := s.Read(b)
if err != nil {
t.Error(err)
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