},
			ssErr:   true,
			ssFatal: false,
			dsErr:   false,
		},
	}

	for _, c := range cases {
		t.Run(c.name, func(t *testing.T) {
			err, fatal := checkBadIPConfig(c.proxy, false)
			if err != nil && !c.ssErr {
				t.Errorf("unexpected error in single-stack case: %v", err)
			} else if err == nil && c.ssErr {
				t.Errorf("unexpected lack of error in single-stack case")

	return utilerrors.NewAggregate(errors)
}

// checkBadIPConfig checks for bad configuration relative to s.PrimaryIPFamily.
// Historically, we did not check most of the config options, so we cannot retroactively
// make IP family mismatches in those options be fatal. When we add new options to check
// here, we should make problems with those options be fatal.
func checkBadIPConfig(s *ProxyServer, dualStackSupported bool) (err error, fatal bool) {