diff --git a/.config/example.yml b/.config/example.yml
index 03ee6e272..85ab0e141 100644
--- a/.config/example.yml
+++ b/.config/example.yml
@@ -57,7 +57,7 @@ db:
 redis:
   host: localhost
   port: 6379
-  #family: 0  # 0=Both, 4=IPv4, 6=IPv6
+  #family: dual  # can be either a number or string (0/dual, 4/ipv4, 6/ipv6)
   #pass: example-pass
   #prefix: example-prefix
   #db: 1
@@ -93,9 +93,6 @@ redis:
 # deliverJobMaxAttempts: 12
 # inboxJobMaxAttempts: 8
 
-# IP address family used for outgoing requests (ipv4, ipv6 or dual)
-#outgoingAddressFamily: ipv4
-
 # Syslog option
 #syslog:
 #  host: localhost
diff --git a/packages/backend/src/config/redis.ts b/packages/backend/src/config/redis.ts
new file mode 100644
index 000000000..b234ff689
--- /dev/null
+++ b/packages/backend/src/config/redis.ts
@@ -0,0 +1,34 @@
+import Logger from '@/services/logger.js';
+import config from './index.js';
+
+const logger = new Logger('config:redis', 'gray', false);
+
+function getRedisFamily(family?: string | number): number {
+	const familyMap = {
+		ipv4: 4,
+		ipv6: 6,
+		dual: 0,
+	};
+	if (typeof family === 'string' && family in familyMap) {
+		return familyMap[family];
+	} else if (typeof family === 'number' && Object.values(familyMap).includes(family)) {
+		return family;
+	}
+
+	if (typeof family !== 'undefined') {
+		logger.warn(`redis family "${family}" is invalid, defaulting to "dual"`);
+	}
+
+	return 0;
+}
+
+export function getRedisOptions(keyPrefix?: string): Record<string, string | number | undefined> {
+	return {
+		port: config.redis.port,
+		host: config.redis.host,
+		family: getRedisFamily(config.redis.family),
+		password: config.redis.pass,
+		db: config.redis.db || 0,
+		keyPrefix,
+	};
+}
diff --git a/packages/backend/src/config/types.ts b/packages/backend/src/config/types.ts
index 89eafb093..a359c7b0b 100644
--- a/packages/backend/src/config/types.ts
+++ b/packages/backend/src/config/types.ts
@@ -1,5 +1,5 @@
 /**
- * ユーザーが設定する必要のある情報
+ * Configuration options set up by the user
  */
 export type Source = {
 	repository_url?: string;
@@ -19,7 +19,7 @@ export type Source = {
 	redis: {
 		host: string;
 		port: number;
-		family?: number;
+		family?: number | 'dual' | 'ipv4' | 'ipv6';
 		pass: string;
 		db?: number;
 		prefix?: string;
@@ -47,8 +47,6 @@ export type Source = {
 
 	id: string;
 
-	outgoingAddressFamily?: 'ipv4' | 'ipv6' | 'dual';
-
 	deliverJobConcurrency?: number;
 	inboxJobConcurrency?: number;
 	deliverJobPerSec?: number;
diff --git a/packages/backend/src/db/postgre.ts b/packages/backend/src/db/postgre.ts
index 363671268..ec56fb54f 100644
--- a/packages/backend/src/db/postgre.ts
+++ b/packages/backend/src/db/postgre.ts
@@ -68,6 +68,7 @@ import { UserPending } from '@/models/entities/user-pending.js';
 
 import { entities as charts } from '@/services/chart/entities.js';
 import { Webhook } from '@/models/entities/webhook.js';
+import { getRedisOptions } from '@/config/redis.js';
 import { dbLogger } from './logger.js';
 import { redisClient } from './redis.js';
 
@@ -186,14 +187,7 @@ export const db = new DataSource({
 	dropSchema: process.env.NODE_ENV === 'test',
 	cache: !config.db.disableCache ? {
 		type: 'ioredis',
-		options: {
-			host: config.redis.host,
-			port: config.redis.port,
-			family: config.redis.family ?? 0,
-			password: config.redis.pass,
-			keyPrefix: `${config.redis.prefix}:query:`,
-			db: config.redis.db || 0,
-		},
+		options: getRedisOptions(`${config.redis.prefix}:query:`),
 	} : false,
 	logging: log,
 	logger: log ? new MyCustomLogger() : undefined,
diff --git a/packages/backend/src/db/redis.ts b/packages/backend/src/db/redis.ts
index cd9c81eb3..f4eadce58 100644
--- a/packages/backend/src/db/redis.ts
+++ b/packages/backend/src/db/redis.ts
@@ -1,15 +1,9 @@
 import Redis from 'ioredis';
 import config from '@/config/index.js';
+import { getRedisOptions } from '@/config/redis.js';
 
-export function createConnection() {
-	return new Redis({
-		port: config.redis.port,
-		host: config.redis.host,
-		family: config.redis.family ?? 0,
-		password: config.redis.pass,
-		keyPrefix: `${config.redis.prefix}:`,
-		db: config.redis.db || 0,
-	});
+export function createConnection(): Redis.Redis {
+	return new Redis(getRedisOptions(`${config.redis.prefix}:`));
 }
 
 export const subscriber = createConnection();
diff --git a/packages/backend/src/queue/initialize.ts b/packages/backend/src/queue/initialize.ts
index 4f251388b..10f47de12 100644
--- a/packages/backend/src/queue/initialize.ts
+++ b/packages/backend/src/queue/initialize.ts
@@ -1,15 +1,10 @@
 import Bull from 'bull';
 import config from '@/config/index.js';
+import { getRedisOptions } from '@/config/redis.js';
 
-export function initialize<T>(name: string, limitPerSec = -1) {
+export function initialize<T>(name: string, limitPerSec = -1): Bull.Queue<T> {
 	return new Bull<T>(name, {
-		redis: {
-			port: config.redis.port,
-			host: config.redis.host,
-			family: config.redis.family ?? 0,
-			password: config.redis.pass,
-			db: config.redis.db || 0,
-		},
+		redis: getRedisOptions(),
 		prefix: config.redis.prefix ? `${config.redis.prefix}:queue` : 'queue',
 		limiter: limitPerSec > 0 ? {
 			max: limitPerSec,