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resolve: change DNS_PACKET_UNICAST_SIZE_LARGE_MAX to 1232 (#27171)
The old common default was 4096, until 2020 on which all DNS servers (verified on BIND9, NSD, Unbound, dnsmasq) switched to 1232 as an agreed max size [1]. [1] https://www.dnsflagday.net/2020/#message-size-considerations
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@ -55,8 +55,8 @@ assert_cc(sizeof(DnsPacketHeader) == 12);
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/* RFC 1035 say 512 is the maximum, for classic unicast DNS */
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#define DNS_PACKET_UNICAST_SIZE_MAX 512u
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/* With EDNS0 we can use larger packets, default to 4096, which is what is commonly used */
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#define DNS_PACKET_UNICAST_SIZE_LARGE_MAX 4096u
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/* With EDNS0 we can use larger packets, default to 1232, which is what is commonly used */
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#define DNS_PACKET_UNICAST_SIZE_LARGE_MAX 1232u
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struct DnsPacket {
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unsigned n_ref;
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