/etc/trafficserver/splitdns.config is in trafficserver 3.2.4-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# splitdns.config
#
#
# The purpose of this file is to specify the dns server for
# specific objects or sets of objects.
#
# Each line consists of a set of tag value pairs. The pairs
# are in the format <tag>=<value>. Please note that there
# should not be any spaces in the specifiers.
#
# Each line must include exactly one primary specifier
#
# Primary destination specifiers are
# dest_domain=
# dest_host=
# url_regex=
#
#
# Available server directives are:
# Required:
# named= ( required; a DNS server; port may be included,
# separated by ':'. If none provided, the default
# port used is 53. Multiple DNS server may be
# specified, separated by spaces or ';'. The
# DNS servers are required to be in ip address
# format )
#
# Optional:
# def_domain= ( optional; when provided, only one default
# may be listed on the line )
#
# search_list= ( optional; however, if provided, requires at
# least one search domain. If an organization
# has multiple zones, they may be specified,
# separated by spaces or ';'. )
#
# Each line must include at least a named= directive with an IP address
# in the "dot" format. "def_domain=" and "search_list=" are optional.
#
# Additional notes:
#
# For improved performance, the system has a 'fast path', which is activated
# when all the primary destination specifiers are of the type
# 'dest_domain' or 'dest_host'. It also requires that the number of rules
# not exceed four (4). One of the side effect of this is, the first match
# will terminate the search.
#
# If a host name is not fully qualified, i.e. does not have the domain
# specifier (ex. 'internal' instead of internal.example.com'), then
# there is no rule using the primary destination specifier 'url_regex'.
#
#
# Example:
#
#dest_domain=int.ik.com named="255.257..." def_domain="int.ik.com" search_list="int.ik.com mkt.ik.com"
#dest_domain=!int.ik.com named="255.25..." def_domain="ik.com"
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