Knot DNSRTT module

Development

Our 2021 Knot DNSRTT was developed by Pithayuth Charnsethikul, as part of a CSCI651 research project, advised by John Heidemann, in Fall 2020.

The template of DNSRTT is derived from the Knot RRL module.

Description

DNSRTT provides the feature to enable TCbit whenever a DNS server needs extra tcp connections for measuring RTT.

Configuration

1. Install Knot DNS following the instructions in Knot DNS documentation.

2. Generated a configuration file from LocalRoot.

3. Enable DNSRTT by setting the mod-dnsrtt module globally or per zone.

   An example of enabling DNSRTT in knot.conf

    mod-dnsrtt:
      - id: default
        tcp-need: 5
        slip: 2
        interval: 1800
        experiment: on
   
    template:
      - id: default
        global-module: mod-dnsrtt/default
   

   Arguments

    id: STR
    A module identifier
   
    tcp-need: INT (Required)
    Number of TCP connections for each client network (IPv4/24, IPv6/56) that a DNS server expects for each interval
   
    slip: INT, table-size: INT, whitelist: ADDR[/INT] | ADDR-ADDR ...
    refer to https://www.knot-dns.cz/docs/2.4/html/reference.html#mod-rrl
   
    interval: INT
    interval in seconds
    Default: 3600
   
    experiment: BOOL
    if enabled, DNSRTT disables TCbit---doesn't send an actual TC bit--- but keep increasing the counter like it does.
    Otherwise, an actual TC bit is sent to a client.
    Default: on