You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: fake_dns_server.go
    path of file: ./repos/traefik/integration
    
    the code of the file until where you have to start completion: package integration

import (
	"fmt"
	"net"
	"os"

	"github.com/miekg/dns"
	"github.com/rs/zerolog/log"
)

type handler struct {
	traefikIP string
}

// ServeDNS a fake DNS server
// Simplified version of the Challenge Test Server from Boulder
// https://g
    
func startFakeDNSServer(traefikIP string) *dns.Server {
	srv := &dns.Server{
		Addr:    ":5053",
		Net:     "udp",
		Handler: &handler{traefikIP},
	}

	go func() {
		log.Info().Msg("Start a fake DNS server.")
		if err := srv.ListenAndServe(); err != nil {
			log.Fatal().Err(err).Msg("Failed to set udp listener")
		}
	}()

	return srv
}