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Align the default EDNS buffer sizes with the DNS Day 2020 recommendations

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Use 1232 as the default buffer size for outgoing queries.
See https://dnsflagday.net/2020/ for details.
This commit is contained in:
Jonas Bushart 2020-11-03 16:05:59 +01:00 committed by Benjamin Fry
parent 7895de879f
commit 550c566720
2 changed files with 6 additions and 2 deletions
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4
crates/client/src/client/async_client.rs
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@ -28,7 +28,9 @@ use crate::rr::dnssec::Signer;
use crate::rr::{DNSClass, Name, Record, RecordSet, RecordType};
// TODO: this should be configurable
pub const MAX_PAYLOAD_LEN: u16 = 1500 - 40 - 8; // 1500 (general MTU) - 40 (ipv6 header) - 8 (udp header)
// > An EDNS buffer size of 1232 bytes will avoid fragmentation on nearly all current networks.
// https://dnsflagday.net/2020/
pub const MAX_PAYLOAD_LEN: u16 = 1232;
/// A DNS Client implemented over futures-rs.
///

4
crates/proto/src/xfer/dns_handle.rs
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@ -18,7 +18,9 @@ use crate::op::{Message, MessageType, OpCode, Query};
use crate::xfer::{DnsRequest, DnsRequestOptions, DnsResponse, SerialMessage};
// TODO: this should be configurable
const MAX_PAYLOAD_LEN: u16 = 1500 - 40 - 8; // 1500 (general MTU) - 40 (ipv6 header) - 8 (udp header)
// > An EDNS buffer size of 1232 bytes will avoid fragmentation on nearly all current networks.
// https://dnsflagday.net/2020/
const MAX_PAYLOAD_LEN: u16 = 1232;
/// The StreamHandle is the general interface for communicating with the DnsMultiplexer
pub struct StreamHandle {