diff --git a/README.md b/README.md
index 200e296..4f59ee2 100644
--- a/README.md
+++ b/README.md
@@ -35,11 +35,54 @@ There's a basic UI which can display multiple cameras:
 
 ![](pics/web-ui.jpg?raw=true)
 
-The server will send a broadcast packet every few seconds to discover all the cameras available; this means that it *must* run in the same broadcast domain (VLAN) as your cameras. For debugging purposes, you can send the packets to a specific camera by setting `--discovery_ip` to its IP address.
-
 Clicking on the image will take you to a page that has audio streaming. Click the button below the image to mute/unmute the audio.
 
-To customize the camera names, edit the file `cameras.txt` and add the names of your cameras, one per line, in the format `CAMERA_ID=descriptive name` (you must restart the HTTP server for the changes to take effect).
+
+## Settings
+
+You can provide a config file in `yml` format, check `config.example.yml` for an updated example:
+
+```yml
+http_server:
+  port: 5000
+
+logging:
+  level: debug
+  use_color: true
+
+cameras:
+  FTYC477360FAWUK:
+    alias: "A9"
+    rotate: 1
+    mirror: false
+    fix_packet_loss: yes
+    audio: true
+  BATC609531EXLVS:
+    alias: "X5"
+
+# If you are crossing broadcast domains (VLANs) then
+# you need to specify all IPs as unicast targets
+discovery_ips:
+  - 192.168.40.101
+  - 192.168.40.102
+  - 192.168.40.103
+  - 192.168.40.104
+  - 192.168.40.105
+
+# If you are in the same broadcast domain, then
+# it's easier to just use the broadcast address of your network
+# discovery_ips:
+#   - 192.168.1.255
+
+blacklisted_ips:
+  - 192.168.40.102
+```
+
+All keys are optional
+
+You must restart the HTTP server for changes to the settings file to take effect.
+
+----
 
 ## Protocol
 
diff --git a/cameras-example.txt b/cameras-example.txt
deleted file mode 100644
index 55655ac..0000000
--- a/cameras-example.txt
+++ /dev/null
@@ -1,10 +0,0 @@
-# This is a simple name mapping for cameras, in the form
-#
-# CAMERA_ID=descriptive name
-#
-# Blank lines and lines starting with "#" are ignored.
-#
-# Any updates to this file require restarting the HTTP server.
-# This file is meant to be updated manually, it is NOT updated dynamically.
-
-FTYC811847AGFDZ=Office camera
diff --git a/cmd/bin.ts b/cmd/bin.ts
index d93fea3..2837757 100644
--- a/cmd/bin.ts
+++ b/cmd/bin.ts
@@ -3,8 +3,8 @@ import { hideBin } from "yargs/helpers";
 import yargs from "yargs/yargs";
 
 import { serveHttp } from "../http_server.js";
-import { opt } from "../options.js";
 import { pair } from "../pair.js";
+import { loadConfig, config } from "../settings.js";
 
 import { buildLogger, logger } from "../logger.js";
 
@@ -16,23 +16,38 @@ yargs(hideBin(process.argv))
     "start http server",
     (yargs) => {
       return yargs
-        .option("audio", { describe: "Also stream audio from camera", default: true })
-        .option("color", { describe: "Use color in logs", default: undefined })
+        .option("color", { describe: "Use color in logs" })
         .boolean(["audio", "color"])
-        .option("log_level", { describe: "Set log level", default: "info" })
-        .option("discovery_ip", { describe: "Camera discovery IP address", default: "192.168.1.255" })
-        .option("attempt_to_fix_packet_loss", { default: false })
-        .option("port", { describe: "HTTP Port to listen on", default: 5000 })
+        .option("config_file", { describe: "Specify config file" })
+        .option("log_level", { describe: "Set log level" })
+        .option("discovery_ip", { describe: "Camera discovery IP address" })
+        .option("port", { describe: "HTTP Port to listen on" })
+        .string(["log_level", "discovery_ip", "config_file"])
         .number(["port"])
         .strict();
     },
     (argv) => {
-      const opts: opt = argv as opt;
-      buildLogger(argv.log_level, argv.color);
+      if (argv.config_file !== undefined) {
+        loadConfig(argv.config_file);
+      }
+      if (argv.port) {
+        config.http_server.port = argv.port;
+      }
+      if (argv.color !== undefined) {
+        config.logging.use_color = argv.color;
+      }
+      if (argv.log_level !== undefined) {
+        config.logging.level = argv.log_level;
+      }
+      if (argv.discovery_ip !== undefined) {
+        config.discovery_ips = [argv.discovery_ip];
+      }
+
+      buildLogger(config.logging.level, config.logging.use_color);
       if (majorVersion < 16) {
         logger.error(`Node version ${majorVersion} is not supported, may malfunction`);
       }
-      serveHttp(opts, argv.port, argv.audio || false);
+      serveHttp(config.http_server.port);
     },
   )
   .command(
@@ -40,23 +55,19 @@ yargs(hideBin(process.argv))
     "configure a camera",
     (yargs) => {
       return yargs
-        .option("color", { describe: "Use color in logs", default: undefined })
-        .boolean(["color"])
         .option("log_level", { describe: "Set log level", default: "info" })
         .option("discovery_ip", { describe: "Camera discovery IP address", default: "192.168.1.255" })
-        .option("attempt_to_fix_packet_loss", { default: false })
         .option("ssid", { describe: "Wifi network for the camera to connect to" })
         .option("password", { describe: "Wifi network password" })
         .demandOption(["ssid", "password"])
         .string(["ssid", "password"]);
     },
     (argv) => {
-      const opts: opt = argv as unknown as opt;
-      buildLogger(argv.log_level, argv.color);
+      buildLogger(argv.log_level, undefined);
       if (majorVersion < 16) {
         logger.error(`Node version ${majorVersion} is not supported, may malfunction`);
       }
-      pair({ opts, ssid: argv.ssid, password: argv.password });
+      pair({ ssid: argv.ssid, password: argv.password });
     },
   )
   .demandCommand()
diff --git a/config.example.yml b/config.example.yml
new file mode 100644
index 0000000..cc9c3e9
--- /dev/null
+++ b/config.example.yml
@@ -0,0 +1,33 @@
+http_server:
+  port: 5000
+
+logging:
+  level: debug
+  use_color: true
+
+cameras:
+  FTYC477360FAWUK:
+    alias: "A9"
+    rotate: 1
+    mirror: false
+    fix_packet_loss: yes
+    audio: true
+  BATC609531EXLVS:
+    alias: "X5"
+
+# If you are crossing broadcast domains (VLANs) then
+# you need to specify all IPs as unicast targets
+discovery_ips:
+  - 192.168.40.101
+  - 192.168.40.102
+  - 192.168.40.103
+  - 192.168.40.104
+  - 192.168.40.105
+
+# If you are in the same broadcast domain, then
+# it's easier to just use the broadcast address of your network
+# discovery_ips:
+#   - 192.168.1.255
+
+blacklisted_ips:
+  - 192.168.40.102
diff --git a/discovery.ts b/discovery.ts
index 336c270..2ec5a70 100644
--- a/discovery.ts
+++ b/discovery.ts
@@ -4,6 +4,7 @@ import EventEmitter from "node:events";
 import { Commands } from "./datatypes.js";
 import { create_LanSearch, parse_PunchPkt } from "./impl.js";
 import { logger } from "./logger.js";
+import { config } from "./settings.js";
 
 const handleIncomingPunch = (msg: Buffer, ee: EventEmitter, rinfo: RemoteInfo) => {
   const ab = new Uint8Array(msg).buffer;
@@ -12,11 +13,15 @@ const handleIncomingPunch = (msg: Buffer, ee: EventEmitter, rinfo: RemoteInfo) =
   if (cmd_id != Commands.PunchPkt) {
     return;
   }
+  if (config.blacklisted_ips.indexOf(rinfo.address) !== -1) {
+    logger.debug(`Dropping packet of blacklisted IP: ${rinfo.address}`);
+    return;
+  }
   logger.debug("Received a PunchPkt message");
   ee.emit("discover", rinfo, parse_PunchPkt(dv));
 };
 
-export const discoverDevices = (discovery_ip: string): EventEmitter => {
+export const discoverDevices = (discovery_ips: string[]): EventEmitter => {
   const sock = createSocket("udp4");
   const SEND_PORT = 32108;
   const ee = new EventEmitter();
@@ -30,17 +35,19 @@ export const discoverDevices = (discovery_ip: string): EventEmitter => {
 
   let timers = [];
   sock.on("listening", () => {
-    sock.setBroadcast(true);
-    logger.info(`Searching for devices on ${discovery_ip}`);
-
     let ls_buf = create_LanSearch();
-    let int = setInterval(() => {
-      logger.log("trace", `>> LanSearch`);
+    sock.setBroadcast(true);
+    discovery_ips.forEach((discovery_ip) => {
+      logger.info(`Searching for devices on ${discovery_ip}`);
+
+      let int = setInterval(() => {
+        logger.log("trace", `>> LanSearch [${discovery_ip}]`);
+        sock.send(new Uint8Array(ls_buf.buffer), SEND_PORT, discovery_ip);
+      }, 3000);
+      timers.push(int);
+      logger.log("trace", `>> LanSearch [${discovery_ip}]`);
       sock.send(new Uint8Array(ls_buf.buffer), SEND_PORT, discovery_ip);
-    }, 3000);
-    timers.push(int);
-    logger.log("trace", `>> LanSearch`);
-    sock.send(new Uint8Array(ls_buf.buffer), SEND_PORT, discovery_ip);
+    });
   });
 
   sock.bind();
diff --git a/handlers.ts b/handlers.ts
index 7a9e6a4..b6d586c 100644
--- a/handlers.ts
+++ b/handlers.ts
@@ -5,6 +5,7 @@ import { Session } from "./session.js";
 import { u16_swap, u32_swap } from "./utils.js";
 import { logger } from "./logger.js";
 import { hexdump } from "./hexdump.js";
+import { config } from "./settings.js";
 
 export const notImpl = (session: Session, dv: DataView) => {
   const raw = dv.readU16();
@@ -207,7 +208,7 @@ const deal_with_data = (session: Session, dv: DataView) => {
         }
         // this should always be enabled but currently it seems to cause more visual distortion
         // than just missing some frames
-        if (!session.options.attempt_to_fix_packet_loss) {
+        if (!config.cameras[session.devName].fix_packet_loss) {
           return;
         }
 
diff --git a/http_server.ts b/http_server.ts
index 663c41d..501e8a1 100644
--- a/http_server.ts
+++ b/http_server.ts
@@ -1,9 +1,8 @@
 import { RemoteInfo } from "dgram";
-import { readFileSync, existsSync } from "node:fs";
 import http from "node:http";
 
 import { logger } from "./logger.js";
-import { opt } from "./options.js";
+import { config } from "./settings.js";
 import { discoverDevices } from "./discovery.js";
 import { DevSerial, SendDevStatus } from "./impl.js";
 import { Handlers, makeSession, Session, startVideoStream } from "./session.js";
@@ -19,9 +18,6 @@ const responses: Record<string, http.ServerResponse[]> = {};
 const audioResponses: Record<string, http.ServerResponse[]> = {};
 const sessions: Record<string, Session> = {};
 
-// Text file containing the mapping of camera names.
-const nameFile = "cameras.txt";
-
 // https://sirv.com/help/articles/rotate-photos-to-be-upright/
 const oMap = [1, 8, 3, 6];
 const oMapMirror = [2, 7, 4, 5];
@@ -29,29 +25,13 @@ const orientations = [1, 2, 3, 4, 5, 6, 7, 8].reduce((acc, cur) => {
   return { [cur]: createExifOrientation(cur), ...acc };
 }, {});
 
-let camSettings: { [key: string]: { orientation: number; mirror: boolean } } = {};
-
 // Reads the mapping of serial numbers to camera names from the text file.
-const cameraNames = Object.assign(
-  {},
-  ...(existsSync(nameFile) ? readFileSync(nameFile, "utf8") : "")
-    .toString()
-    .replace(/\r\n/g, "\n")
-    .split("\n")
-    .filter((l) => !l.startsWith("#"))
-    .filter((l) => l.trim() != "")
-    .map((l) => {
-      let kv = l.split("=");
-      return { [kv[0].trim()]: kv[1].trim() };
-    }),
-);
 
 // Returns the camera name (custom name, if it exists, otherwise its ID).
-const cameraName = (id: string): string => cameraNames[id] || id;
+const cameraName = (id: string): string => config.cameras[id].alias || id;
 
 // The HTTP server.
-export const serveHttp = (opts: opt, port: number, with_audio: boolean) => {
-  logger.info(`Mapping camera names: ${JSON.stringify(cameraNames)}`);
+export const serveHttp = (port: number) => {
   const server = http.createServer((req, res) => {
     if (req.url.startsWith("/ui/")) {
       let devId = req.url.split("/")[2];
@@ -70,7 +50,7 @@ export const serveHttp = (opts: opt, port: number, with_audio: boolean) => {
         .toString()
         .replace(/\${id}/g, devId)
         .replace(/\${name}/g, cameraName(devId))
-        .replace(/\${audio}/g, with_audio.toString());
+        .replace(/\${audio}/g, config.cameras[devId].audio ? "true" : "false");
       res.end(ui);
       return;
     }
@@ -102,17 +82,17 @@ export const serveHttp = (opts: opt, port: number, with_audio: boolean) => {
 
     if (req.url.startsWith("/rotate/")) {
       let devId = req.url.split("/")[2];
-      let curPos = camSettings[devId]?.orientation || 0;
+      let curPos = config.cameras[devId]?.rotate || 0;
       let nextPos = (curPos + 1) % 4;
       logger.debug(`Rotating ${devId} to ${nextPos}`);
-      camSettings[devId].orientation = nextPos;
+      config.cameras[devId].rotate = nextPos;
       res.writeHead(204);
       res.end();
       return;
     } else if (req.url.startsWith("/mirror/")) {
       let devId = req.url.split("/")[2];
       logger.debug(`Mirroring ${devId}`);
-      camSettings[devId].mirror = !camSettings[devId].mirror;
+      config.cameras[devId].mirror = !config.cameras[devId].mirror;
       res.writeHead(204);
       res.end();
       return;
@@ -155,7 +135,7 @@ export const serveHttp = (opts: opt, port: number, with_audio: boolean) => {
     }
   });
 
-  let devEv = discoverDevices(opts.discovery_ip);
+  let devEv = discoverDevices(config.discovery_ips);
 
   const startSession = (s: Session) => {
     s.send(SendDevStatus(s));
@@ -172,14 +152,14 @@ export const serveHttp = (opts: opt, port: number, with_audio: boolean) => {
     logger.info(`Discovered camera ${dev.devId} at ${rinfo.address}`);
     responses[dev.devId] = [];
     audioResponses[dev.devId] = [];
-    const s = makeSession(Handlers, dev, rinfo, startSession, opts);
+    const s = makeSession(Handlers, dev, rinfo, startSession);
 
     const header = Buffer.from(`--${BOUNDARY}\r\nContent-Type: image/jpeg\r\n\r\n`);
 
     s.eventEmitter.on("frame", () => {
       // Add an EXIF header to indicate if the image should be rotated or mirrored
-      let orientation = camSettings[dev.devId].orientation;
-      orientation = camSettings[dev.devId].mirror ? oMapMirror[orientation] : oMap[orientation];
+      let orientation = config.cameras[dev.devId].rotate;
+      orientation = config.cameras[dev.devId].mirror ? oMapMirror[orientation] : oMap[orientation];
       const exifSegment = orientations[orientation];
       const jpegHeader = addExifToJpeg(s.curImage[0], exifSegment);
       const assembled = Buffer.concat([jpegHeader, ...s.curImage.slice(1)]);
@@ -193,7 +173,7 @@ export const serveHttp = (opts: opt, port: number, with_audio: boolean) => {
       logger.info(`Camera ${dev.devId} disconnected`);
       delete sessions[dev.devId];
     });
-    if (with_audio) {
+    if (config.cameras[dev.devId].audio) {
       s.eventEmitter.on("audio", ({ gap, data }) => {
         // ew, maybe WS?
         var b64encoded = Buffer.from(data).toString("base64");
@@ -205,7 +185,7 @@ export const serveHttp = (opts: opt, port: number, with_audio: boolean) => {
       });
     }
     sessions[dev.devId] = s;
-    camSettings[dev.devId] = { orientation: 0, mirror: false };
+    config.cameras[dev.devId] = { rotate: 0, mirror: false, ...(config.cameras[dev.devId] || {}) };
   });
 
   logger.info(`Starting HTTP server on port ${port}`);
diff --git a/package-lock.json b/package-lock.json
index 16f596f..5b8c413 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -6,6 +6,7 @@
     "": {
       "dependencies": {
         "winston": "^3.13.0",
+        "yaml": "^2.4.2",
         "yargs": "^17.7.2"
       },
       "devDependencies": {
@@ -14,6 +15,9 @@
         "mocha": "^10.2.0",
         "ts-node": "^10.9.2",
         "typescript": "^5.3.3"
+      },
+      "engines": {
+        "node": ">=16.0"
       }
     },
     "node_modules/@colors/colors": {
@@ -1711,6 +1715,17 @@
         "node": ">=10"
       }
     },
+    "node_modules/yaml": {
+      "version": "2.4.2",
+      "resolved": "https://registry.npmjs.org/yaml/-/yaml-2.4.2.tgz",
+      "integrity": "sha512-B3VqDZ+JAg1nZpaEmWtTXUlBneoGx6CPM9b0TENK6aoSu5t73dItudwdgmi6tHlIZZId4dZ9skcAQ2UbcyAeVA==",
+      "bin": {
+        "yaml": "bin.mjs"
+      },
+      "engines": {
+        "node": ">= 14"
+      }
+    },
     "node_modules/yargs": {
       "version": "17.7.2",
       "resolved": "https://registry.npmjs.org/yargs/-/yargs-17.7.2.tgz",
diff --git a/package.json b/package.json
index b319f9e..8340e77 100644
--- a/package.json
+++ b/package.json
@@ -14,9 +14,10 @@
   },
   "dependencies": {
     "winston": "^3.13.0",
+    "yaml": "^2.4.2",
     "yargs": "^17.7.2"
   },
   "engines": {
-	  "node": ">=16.0"
+    "node": ">=16.0"
   }
 }
diff --git a/pair.ts b/pair.ts
index af61641..33d390a 100644
--- a/pair.ts
+++ b/pair.ts
@@ -1,16 +1,16 @@
 import { RemoteInfo } from "dgram";
 
-import { opt } from "./options.js";
+import { config } from "./settings.js";
 import { discoverDevices } from "./discovery.js";
 import { DevSerial, SendReboot, SendWifiSettings } from "./impl.js";
 import { Handlers, makeSession, Session, configureWifi } from "./session.js";
 import { logger } from "./logger.js";
 
-export const pair = ({ opts, ssid, password }: { opts: opt; ssid: string; password: string }) => {
+export const pair = ({ ssid, password }: { ssid: string; password: string }) => {
   logger.info(`Will configure any devices found to join ${ssid}`);
   let sessions: Record<string, Session> = {};
 
-  let devEv = discoverDevices(opts.discovery_ip);
+  let devEv = discoverDevices(config.discovery_ips);
   if (password == "") {
     throw new Error("You must set a non-zero-length password");
   }
@@ -33,7 +33,7 @@ export const pair = ({ opts, ssid, password }: { opts: opt; ssid: string; passwo
       return;
     }
     logger.info(`Discovered camera ${dev.devId} at ${rinfo.address}`);
-    const s = makeSession(Handlers, dev, rinfo, onLogin, opts);
+    const s = makeSession(Handlers, dev, rinfo, onLogin);
 
     s.eventEmitter.on("disconnect", () => {
       logger.info(`Camera ${dev.devId} disconnected`);
diff --git a/session.ts b/session.ts
index b845b86..eb48c10 100644
--- a/session.ts
+++ b/session.ts
@@ -4,7 +4,6 @@ import EventEmitter from "node:events";
 import { Commands, CommandsByValue } from "./datatypes.js";
 import { handle_Drw, handle_DrwAck, handle_P2PAlive, handle_P2PRdy, makeP2pRdy, notImpl, noop } from "./handlers.js";
 import { create_P2pAlive, DevSerial, SendStartVideo, SendVideoResolution, SendWifiDetails } from "./impl.js";
-import { opt } from "./options.js";
 import { logger } from "./logger.js";
 
 export type Session = {
@@ -24,7 +23,6 @@ export type Session = {
   frame_is_bad: boolean;
   frame_was_fixed: boolean;
   started: boolean;
-  options: opt;
 };
 
 export type PacketHandler = (session: Session, dv: DataView, rinfo: RemoteInfo) => void;
@@ -53,7 +51,6 @@ export const makeSession = (
   dev: DevSerial,
   ra: RemoteInfo,
   onLogin: (s: Session) => void,
-  options: opt,
 ): Session => {
   let unackedDrw = {};
   const sock = createSocket("udp4");
@@ -130,7 +127,6 @@ export const makeSession = (
     rcvSeqId: 0,
     frame_is_bad: false,
     frame_was_fixed: false,
-    options: options,
     unackedDrw,
   };
 
diff --git a/settings.ts b/settings.ts
new file mode 100644
index 0000000..989e3b0
--- /dev/null
+++ b/settings.ts
@@ -0,0 +1,45 @@
+import fs from "node:fs";
+import { parse } from "yaml";
+
+interface HttpServerConfig {
+  port: number;
+}
+
+interface LoggingConfig {
+  level: string;
+  use_color?: boolean;
+}
+
+interface CameraConfig {
+  alias?: string;
+  rotate?: number;
+  mirror?: boolean;
+  audio?: boolean;
+  fix_packet_loss?: boolean;
+}
+
+interface AppConfig {
+  http_server: HttpServerConfig;
+  logging: LoggingConfig;
+  cameras: Record<string, CameraConfig>;
+  discovery_ips: string[];
+  blacklisted_ips: string[];
+}
+
+const DefaultConfig: AppConfig = {
+  http_server: { port: 5000 },
+  logging: { level: "info" },
+  cameras: {},
+  discovery_ips: ["192.168.1.255"],
+  blacklisted_ips: [],
+};
+
+let config = DefaultConfig;
+
+export const loadConfig = (path: string) => {
+  const data = fs.readFileSync(path, { encoding: "utf-8" });
+  config = parse(data) as AppConfig;
+  config = { ...DefaultConfig, ...config };
+};
+
+export { config };
diff --git a/tests/integration.test.js b/tests/integration.test.js
index 5fb4a70..f8cc61f 100644
--- a/tests/integration.test.js
+++ b/tests/integration.test.js
@@ -20,7 +20,7 @@ describe("integration", () => {
       }
       return [];
     });
-    const ev = discoverDevices("127.0.0.1");
+    const ev = discoverDevices(["127.0.0.1"]);
     ev.on("discover", (rinfo, dev) => {
       assert.deepEqual(dev.devId, EXPECTED_SERIAL);
       ev.emit("close");