Cloudflare tunnel vs ddns

Add recommended policies. Go to Control Panel > Terminal & SNMP > Enable SSH service. Run this command to install cloudflared: In Cloudflare: Go to My Profile > API Tokens and hit "Create Token". For years I had been using CloudFlare DNS + a third party solution for DDNS. Demonstration. Feb 19, 2024 · Navigate to Services → Dynamic DNS → Settings on your OPNsense firewall. In the following sections, we will be covering how to install and configure this tool on Pi-hole. O. hostname is a fully-qualified domain name under the domain you chose to Authorize for Argo Tunnels earlier. I’ve also configured dynamic DNS on some of the above routers, when the ISPs didn’t want to give a static IP. With this model, your team does not need to go through the hassle of poking holes in your firewall or validating that traffic originated from Cloudflare IPs. CloudFlare has an option to proxy requests through their network which will mask your IP in DNS. KubeSail - Company offering tunneling, dynamic DNS, and other services for self-hosting with Kubernetes. Jun 6, 2024 · Figure 13: Cloudflare Tunnel is created and healthy. Once it’s populated them, click Add Record. 左側メニューから Zero Trust をクリック. 3. 1, Cloudflare implemented DNS -Over- HTTPS proxy functionality into one of their tools: cloudflared. Set DDNS Service provider to cloudflare. Cloudflare has a list of their tunnel IPs, online that can be used. Name your VM instance. tunnel: container_name: cloudflared-tunnel. Copy the . com-v4 and click Switch service. The urls match my internal ones so transitioning is seamless. Magic static routes Oct 25, 2023 · From the Cloudflare dashboard. Access allows users to login from anywhere to access protected resources, using their existing identity provider and integrating with their existing endpoint protection. Configuration took ~10-15 min and the UI/UX is top notch. Log in to your CloudFlare account, select your domain, and access DNS settings. You can often set up DDNS on your router. And that Nabu Casa supports the development of HA. And I had CNAME to point to that 3-rd party DDNS host name. I'm going to use tunnel. Example: eth0. Click the Public Hostname tab and click Add a public hostname. By using the Cloudflare generated TLS certificate you can secure the connection between Cloudflare’s servers and your Nginx server. Now, invoke the Update-CloudflareDDNS. I have my dynamic DNS set up with them, and each dns entry points to a specific port for the service that is running on unpaid. yml, either pasting the token variable directly, or using environment variables. Open external link. Feb 11, 2024 · Once you have this token, we can create another service within our existing traefik-docker-compose. A partial (CNAME) setup allows you to use Cloudflare’s reverse proxy while Mar 25, 2024 · Select Create a tunnel. You can also run a DDNS client on one of your devices, like a computer, a NAS, or a Raspberry Pi. Nothing is set up to allow access to the admin gui. Scroll down to Split Tunnels. In GCP, this is the Internal IP of the VM instance. Aug 17, 2023 · Cloudflare: Generate a Client Certificate for Portainer Edge Agents, and enable mTLS for the primary Portainer API endpoint published by Cloudflare: Enable Zero Trust to create Tunnels. Did successfully had application “Nextcloud” via Cloudflare tunnel May 9, 2024 · Time to Live (TTL) is a field on DNS records that controls how long each record is cached and — as a result — how long it takes for record updates to reach your end users. Problems- I can’t port forward, and i don’t have a static public IP. In order to better understand how a reverse proxy works and the benefits it can provide For the second tunnel, make the same changes as you did for the first tunnel (including creating a pre-shared key), and ensure the following additional settings are defined: Cloudflare Endpoint: Enter the second of your two Anycast IPs. Choose SSH as the service type, and enter the server’s internal IP address name and port in the URL field. You have the option of creating a tunnel via the dashboard or via the command line. Contains 5 units. Mar 20, 2022 · 今天要來跟大家介紹一個自己架網站時，非常好用的神器——Cloudflare Tunnel。=====【訂閱步行魚的頻道】http://bit. Health check target: Custom. Cloudflare automatically assigns nameservers to a domain and these assignments cannot be changed. It enables you to make your self-hosted services accessible from the Internet without the need for complicated port forwarding or firewall configurations. Select the Cloudflare from the Service drop-down menu. Name: enter your subdomain here, eg qnap if you want to access your QNAP at qnap. domain name. Sep 26, 2023 · Verify your certificate is active. Enter the subdomain and select the domain. In other words, it’s a private link. From the AWS console, go to Compute > EC2 > Instances. What is a reverse proxy? A reverse proxy is a server that sits in front of web servers and forwards client (e. Jan 30, 2017 · Click the “Config Tree” tab across the top of the page. com as if it were an origin target in the Cloudflare dashboard. com/NetworkChuck --- 83% discount! That's less than 3 dollars a month, PLUS, you get 2 extra months fo We would like to show you a description here but the site won’t allow us. com might be your blog, support. org. You can only access the docker instances running on other ports. example. 3 min. We recommend getting started with the dashboard, since it will allow you to Sep 16, 2021 · Dynamic DNS (DDNS) is a service that keeps the Domain Name System (DNS) updated with a web property’s correct IP address. Jan 31, 2024 · First, run cloudflared tunnel list to see whether your tunnel is listed as active. 240. Under Gateway logging, enable activity logging for all DNS logs. Since DNS requests are not very large, they can often be sent and received in a single packet. Vs privacy concerns, centralisation, big bad bogeyman. cloudflared is what connects your server to Cloudflare’s global network. Go to your domain’s DNS Records settings Their network also has security protections built in, blocking a variety of threats. We would like to show you a description here but the site won’t allow us. I am browsing this sub for some time and recently, I have seen many mentions of Cloudflare's Tunnel product. Apr 12, 2024 · External link icon. Nabu Casa also provides direct access to the HA device. cloudflare. Login to your DSM. Create a new directory: C:\Cloudflared\bin. command: tunnel run. Once the CNAME is added, you can start the tunnel to access your local server via the internet using the hostname you assigned. Learn how to avoid a costly mistake when using Cloudflare Tunnel to secure your applications. Fewer points of failure since a direct connection (no need to worry about ngrok/Cloudflare outage). It lets someone send you packets without knowing your real address. In Zero Trust, go to Logs > Gateway > DNS. Create a DNS zone to enable proxy. Cloudflare attracts client requests and sends them to you via this daemon, without requiring you to Apr 25, 2023 · 接下來就可以來開一個 tunnel 了，在以下介面填入. Jun 17, 2024 · To complete the following procedure, you will need to: Add a website to Cloudflare. To test Zero Trust connectivity, double-click the newly added PC. Most subdomains serve a specific purpose within the overall context of your website. Select Create Token. 254. but does it also work around the DDNS or would i need to install cloudflares API. You need to add the wildcard CNAME DNS record for the wildcard subdomain manually because Cloudflare does not create it automatically when adding a wildcard public host subdomain to a tunnel (you even get a corresponding warning when adding a wildcard public host). Add a CNAME record for {your-hostname}. Aug 11, 2023 · CloudFlare. Select Launch instance. Paid supports custom domains. Further, if we look at the DNS configuration, we can see a DNS record was automatically created pointing to the tunnel ID. Dec 8, 2021 · Under the hood, DNS queries generally consist of a single UDP request from the client. Cloudflare Tunnel is basically a reverse-proxy managed by Cloudflare. CloudFlare Network Ports. Cloudflare currently supports rendering a terminal for SSH and VNC connections in a user’s browser. com Mar 25, 2022 · Our connector. Argo Tunnel creates a secure, outbound-only connection between your services and Cloudflare by deploying a lightweight connector in your environment. Add or edit the token name to describe why or how the token is used. wiki So you've set up your domain and configured Cloudflare on your Unraid machine? Now, let's talk about configuring Dynamic DNS directly with Cloudflare. Add a new interface entry, using the name of the interface for your WAN connection. Looks like the tailscale website is down right now. Refer to known issues for details. A place to share, discuss, discover, assist with, gain assistance for, and critique self-hosted alternatives to our favorite web apps, web services, and online tools. Mar 20, 2024 · Connect over SMB with WARP to Tunnel; Connect over RDP with WARP to Tunnel Enable browser rendering. After seeing a ton of people recommend cloudflare tun's I had to give this a try, and I must admit I am amazed at how incredibly easy this was to set up and how awesome it is. Essentially, DDNS allows you to automatically update your domain’s DNS records when a change is detected to your home’s public IP address. Associate your Tunnel with a DNS record. Deploy the WARP client on an end-user device. The cloudflared binary will work with other DoH providers (for example, you could use https://8. Jan 11, 2022 · Step 1 — Generating an Origin CA TLS Certificate. Static URL thanks to static IP or URL (if you use a dynamic DNS). 1. Alternatively, check this guide to route traffic to your tunnel using load balancers. Learn more about Cloudflare’s CDN below, or sign up for free here: Jul 1, 2023 · I have a docker server installed on linux and wanted to host it to the world. Cloudflare. Mar 6, 2024 · Create a Wildcard record. Unlike publicly routable IP addresses, the subdomain Along with releasing their DNS service 1. ps1. Edit the token name if desired (I used "OPNSense DDNS") Permissions should be set to "Zone" - "DNS" - "Edit". box. In many ways, this connection will replace the concept of a traditional VPN concentrator or headend device. 8. Target address: 172. Performance, security, DDOS, zerotrust, other features etc. For User account, enter your RDP server username and password. Contains the command-line client for Cloudflare Tunnel, a tunneling daemon that proxies traffic from the Cloudflare network to your origins. ps1 `. First, open your list of tunnels and click configure next to the tunnel name. CloudFlare DDNS - I suspect many people don't even realize this service is available. Please reload this page to try again. TLDR: Many people use ngrok/Cloudflare since its easier but dynamic DNS does have perks. Thanks. ly/Sub_The_Walking Start for $5 per month for 1,000 minutes of video stored. The Cloudflare Origin CA lets you generate a free TLS certificate signed by Cloudflare to install on your Nginx server. You can use Cloudflare Tunnels + the WARP client (which uses WireGuard) as a VPN directly. Under Device settings, locate the device profile you would like to modify and select Configure. Click Add button with + icon at the right bottom of the Accounts tab. Many people have issues self-hosting their services if they're behind a CG-NAT. Create a VM instance in AWS. ここでインストールする cloudflared が動作していないと公開できないので注意. Zone Resources should be set to "Include" - "Specific zone" - [the zone you want OPNsense to update] Leave the rest as . ps1 script to update the DNS record in Cloudflare by running the command below. Use Command sudo -i to Root. You can treat <UUID>. Helpfull for manually inputting URL for web UI or using rest API Learn how to set up dynamic DNS with Cloudflare and other providers on your Ubiquiti devices. Once you enable Universal SSL, you can review the activation status in the dashboard at SSL/TLS > Edge Certificates or via the API with a GET request . Jun 7, 2024 · To double check that your origin web server is not responding to requests outside Cloudflare while Tunnel is running you can run netcat in the command line: $ netcat -zv [your-server’s-ip-address] 80. cloudflare-ddns : image: favonia/cloudflare-ddns:latest network_mode: host # This makes IPv6 easier; see below restart: always # Restart the updater after reboot cap_add : - SETUID # Capability to change user ID; needed for using PUID. Now let's create the tunnel and serve some content! $ cloudflared --hostname [hostname] --hello-world. I use a couple of routers on the network: pfSense, opnsense, untangle, Cisco firepower and Meraki mx. Use your Synology admin account to connect. ① subdomain，要使用的自訂網址名稱、. Not only did I have to rely on another service provider (an extra point of potential breakdown), but the performance was Apr 5, 2018 · Today we’re introducing Argo Tunnel, a private connection between your web server and Cloudflare. Create a new “A” record with a chosen subdomain name (e. ② domain，選擇一個在 Cloudflare 上註冊的網域、. The command below assumes that your script is in C:\CloudflareDDNS\Update-CloudflareDDNS. networks: I have the Cloudflare DDNS and cert management to keep my dynamic IP up to date. I can quickly turn off the tunnel or leave it off if I don’t want these “active”. Click “Update List”. Wildcard. Apr 11, 2024 · 2. Apr 25, 2023 · michael147 April 25, 2023, 4:23pm 3. When you set up a private Nextcloud installation on your home server and want to have it accessible from the outside network you traditionally need to poke a hole in your NAT and set up dynamic DNS to be able to find the correct IP every time. 100 minutes of video stored included with Pro and Business plans. Cloudflare Tunnel can connect HTTP web servers, SSH servers, remote OPNsense is a great open source firewall with lots of plugins and support for wireguard, dynamic DNS and many other. Jun 17, 2024 · cloudflared connects to Cloudflare’s global network on port 7844. For more details, see our blog post on the topic: Adding DNS-Over-TLS support to OpenWrt (LEDE) with Unbound We would like to show you a description here but the site won’t allow us. On Overview, locate the nameserver names in 2. I know tunnels get raid of the port forwarding problem. Jan 31, 2024 · Manage subdomains. example Cloudflare Community Mar 1, 2024 · In Zero Trust. If the issue persists, please visit the Cloudflare Status page for up-to-date information regarding any ongoing issues. com with the UUID of the created tunnel. privateinternetaccess. Am setting all this with Raspberry Pi running Docker and maintaining all container with application Portainer. cfargotunnel. Cloudflare glossary: Dynamic DNS 1. Sep 27, 2023 · Run cloudflared as a service. Conversely, Cloudflare Argo is used to provide a private tunnel from a target server to Cloudflare’s network, allowing the server to be publicly available while hiding the true endpoint. The Cloudflare Dashboard is temporarily unavailable. Using DNS-Over-TLS on OpenWrt It is possible to encrypt DNS traffic out from your router using DNS-over-TLS if it is running OpenWrt. Cloudflare’s Content Delivery Network gives websites exceptional speed and reliability with minimal hassle, making it a strong choice over Akamai’s CDN. g. Drill down inside the tree structure on the left side: service > dns > dynamic > interface. If your project is on Cloudflare Pages, note that wildcard custom domains are not supported. Apr 6, 2018 · The agent has created a certificate and will use that to secure the connection back to Cloudflare. It feels like you just click a few buttons and save hours of configuration time. Make sure DNS queries from your device appear. Repeat this process for each subdomain proxied to Cloudflare. 左側メニューの So when you set up a Cloudflare tunnel, you use Cloudflare's Zero Trust service. See full list on blog. In this example, the tunnel ID is ef824aef-7557-4b41-a398-4684585177ad, so create a CNAME record specifically targeting ef824aef-7557-4b41-a398-4684585177ad. restart: unless-stopped. Essentially a mesh based VPN. smartghar. Aug 7, 2023 · Save the updated settings. You should now have a Services -> Dynamic DNS option. , “ddns”) and set the temporary IPv4 Oct 6, 2023 · Open Microsoft Remote Desktop and select Add a PC. Select a template from the available API token templates or create a custom token. inlets - Used to be open source; now focused on a polished commercial offering. Go to it. yaml ). Log out of the GUI and back in. Once you have added your domain to Cloudflare and updated your nameservers, you also might want to set up a subdomain. Jul 24, 2021 · With Cloudflare Tunnel you can connect to your server without ever exposing your IP address to the world. 8 Tunnelの作成. Jul 26, 2021 · Let Cloudflare scan and add your existing DNS records. Running WireGuard on top would just slow down the connection. Nov 1, 2022 · cloudflared tunnel route dns <TunnelName> <hostname>. (Optional) To view your existing Split Tunnel configuration, select Manage. exe file you downloaded in step 1 to the new directory and rename it to cloudflared. Since your uni network is dropping incoming connections, Cloudflare Tunnel's incoming connections would also be dropped. And how can i make this work with nignx? Incorporate the following fragment into the compose file (typically docker-compose. In my case, I had […] Protect yourself!! --https://www. image: cloudflare/cloudflared. Unlike publicly routable IP addresses, the subdomain will only proxy traffic for a DNS record in the same Cloudflare account. Keep this window open while you perform the next step. Select Save tunnel. 64. Cloudflare Tunnel is the easiest way to connect your infrastructure to Cloudflare, whether that be a local HTTP server, web services served by a Kubernetes cluster, or a private network segment. e. "My Domain" Now the Tunnel is created, and a new page opens showing the Install connector environment options available for that created May 22, 2024 · A partial ( CNAME) setup allows you to use Cloudflare’s reverse proxy while maintaining your primary and authoritative DNS provider. a webserver). For example, blog. What am trying to achieve is via Cloudflare tunnel securely can access Portainer GUI so can maintain my containers remotely. cloudflared tunnel run <TunnelName>. To generate a certificate with Origin CA We would like to show you a description here but the site won’t allow us. When you create a tunnel, Cloudflare generates a subdomain of cfargotunnel. On your device, open a browser and go to any website. But, this option won't work because CloudFlare will only proxy HTTP traffic on ports 80 and/or 443. Now create a CNAME targeting . Cloudflare (以下Cf) のダッシュボードにログイン. pacman. Apr 27, 2023 · Apr 27, 2023. I have Cloudflare tunnels setup for apps that I want to expose to the internet, file shares, webhooks, etc. 1. The product seems to have many users and Fresh install of SWAG (deleted old docker and config files) using cloudflare global token (log shows no errors, cert successfully made) DNS. Start module. If it isn’t, check the following: Make sure you correctly routed traffic to your tunnel (step 5 in the Tunnel guide) by assigning a CNAME record to point traffic to your tunnel. Make sure to change the Email, Token, Domain, and Record. Press Edit on myddns_ipv4. The server can then return a single reply to the client. If you just want to host your QNAP at the root of the domain, simply enter an @ symbol. We use the Edit zone DNS template in the following examples. , go to Settings > WARP Client. Go to the Cloudflare dashboard. For instance: cloudflared tunnel route dns smartghar myhome. Any help would be highly appreciated (step by setp please). exe. #3. Set the DNS: CNAME->*->my domain, and A->my domain->my IP (with a DDNS Jun 27, 2023 · ตอนนี้ที่บ้านมีใช้ Cloudflare tunnel สำหรับทำให้ Home Assistant เข้าถึงได้จากนอกบ้าน (ถ้าเป็นสมัยก่อนเราจะใช้การทำ dynamic dns + forward port จาก router) แต่ท่า Cloudflare tunnel นี้ทำอะไรได้มาก Jan 22, 2023 · They claim they have enabled WebSockets for Cloudflare Tunnel, but even though I tried the same configuration with Apache / Nginx, Headscale still could not work. Setup Gui To create new Tunnel, go to the Cloudflare Zero Trust dashboard, and under Access, click on Tunnels. Your home internet connection has a Sep 29, 2021 · 3. Mar 11, 2023 · Cloudflare Tunnels is a service offered by Cloudflare, a popular Content Delivery Network (CDN) and security provider. Join the discussion and share your tips. Free for a single tunnel. , go to My Profile > API Tokens. Also the services loaded very slowly when using the tunnel with basic configuration but I think this might be fixed with proper config. Techradar says. Of Cloudflare’s offerings, Cloudflare Access is functionally most similar to Tailscale. I exposed my 443 port and proxied the WebSockets through Cloudflare (combing with NPM). Replace with Cloudflare’s nameservers. Reply. Once you are on a partial setup, the actual resolution of your There are also other limitations (like the fact that you cant stream over it) and also the fact that you get very dependent on cloudflare. You can also create a wildcard DNS record specifically for a deeper subdomain. 1443/180 (already forwarded on router from previous install) Rename swag subdomain config for dockers used (unchanged just dropped sample) Everything is on a proxynet If I don't use the "proxy" in the tunnel, would that by pass the Cloudflare tunnel and just redirect the IP to my home server? I think you're mixing up a couple different concepts Tunneled traffic doesn't need DDNS because the cloudflared software continuously communicates outbound with the Cloudflare proxy so IP changes get picked up on Cloudflare Tunnels Are So Awesome. With Tailscale, your services on your UnRAID server can have a lower level of security since you need to be connected to your May 8, 2023 · You need a domain, not a Dynamic DNS domain. Designed to work well with Kubernetes. Dynami Cloudflare Tunnel client. mdzhigarov (Marin Dzhigarov) May 8, 2023, 8:26pm Dec 11, 2023 · This instructional video will provide a comprehensive guide on how to configure Dynamic DNS with Cloudflare on the OPNSense platform. Remove any existing A, AAAA, or CNAME records on the hostname you want to proxy to Cloudflare. By default, Cloudflare issues — and renews — free, unshared, publicly trusted SSL certificates to all domains added to and activated on Cloudflare. I could not register any devices through Headscale. Next, you will need to install cloudflared and run it. Then with that domain configured at Cloudflare you can configure a tunnel - no port forwarding, no need to worry about static vs dynamic IP. May 9, 2024 · In Cloudflare, add an A, AAAA, or CNAME record. net. The main technical difference between Nabu Casa and Cloudflare is in privacy, not security. Find "Edit zone DNS" and click "Use template". About Cloudflare Tunnels. com could be your customer help portal, and store. Click on Create a tunnel, enter a name for that tunnel, i. May 16, 2023 · Are you interested in Remote Access for your Homelab? In this YouTube video, I will explain the potential implications and problems with Cloudflare Tunnel, a Jun 7, 2024 · When you create a tunnel, Cloudflare generates a subdomain of cfargotunnel. Longer TTLs speed up DNS lookups by increasing the chance of cached results, but a longer TTL also means that updates to your records take longer to go into effect. Reverse proxies are typically implemented to help increase security, performance, and reliability. yml or docker-compose. This connectivity is made possible through our lightweight, open-source connector, cloudflared. Choose Cloudflared for the connector type and select Next. ③ 要 tunnel Cloudflare offers better speed with no trade-offs in security or ease of use. To create a wildcard DNS record, create a DNS record with an * in the Name field. Jun 6, 2023 · Not sure what I need to do next to use wireguard. com. This makes support for UDP across our Zero Trust platform a key enabler to pulling the plug on your VPN. Eventually, I gave Cloudflare Tunnel up. Choose a connection method. cdn. Connect with cloudflared. Type a Description, such as My DDNS from Cloudflare. We suggest choosing a name that reflects the type of resources you want to connect through this tunnel (for example, enterprise-VPC-01). If your server is still responding on those ports, you will see: Jan 11, 2024 · To create and manage tunnels, you will need to install and authenticate cloudflared on your origin server. Starting at $5 per month. web browser) requests to those web servers. 17. Download the latest cloudflared version. Verify device connectivity. Tunnel capacity for cloudflared. Luckily, we can get around that with the help of Cloudflare tunnels. C:\CloudflareDDNS\Update-CloudflareDDNS. Ensure that Enabled option is checked. For PC name, enter the private IP address of your RDP server. Access Synology via SSH. To use Cloudflare Tunnel, your firewall must allow outbound connections to the following destinations on port 7844 (via UDP if using the quic protocol or TCP if using the http2 protocol). and select your account and domain. Spin up a Portainer Server core instance per this document in a container runtime environment. Open CMD as an administrator and go to C:\Cloudflared\bin. Performance, security Vs having 3rd party bin inside your perimeter. Traffic between devices using Tailscale is end-to-end encrypted, meaning no one at Tailscale can see what you Feb 20, 2021 · Enter “ddns” into the filter field, and press Install on the ddns-scripts-cloudflare and the luci-app-ddns packages. Go to the DNS tab. Use this option to proxy only individual subdomains through Cloudflare’s global network when you cannot change your authoritative DNS provider. albert June 6, 2023, 8:07am 2. The demonstration will Oct 5, 2022 · Am new to Cloudflare and started exposing my services to internet via Cloudflare tunnels. This daemon sits between Cloudflare network and your origin (e. Use your client to access Synology via SSH. If you want to configure using CloudFlare, make sure you set the proxy option to DNS Only. You can think of Argo Tunnel as a virtual P. Pros with dynamic dns. Award. 1 This rule is only required for firewalls that enforce SNI. 2 min. The logical plan here would be either: host Tailscale (no need to bother with a VPS) and watch most of your problems go away. Join the Cloudflare Community and share your experience and questions. Cloudflare can render certain non-web applications in your browser without the need for client software or end-user configuration changes. $ netcat -zv [your-server’s-ip-address] 443. Few months ago, OPNsense decided to switch from dyndns (os-dyndns) to DDclient (os-ddclient) and it seems some users, including me, have issues with switching from legacy one to new one. LocalToNet - Supports UDP. Jan 27, 2023 · Dynamic DNS is a useful service that allows you to use a fixed and memorable address for your home network even when your ISP changes your home network's IP address. Enter a name for your tunnel. Tunnel makes it so that only traffic that routes through Cloudflare can reach your server. External link icon. Or, with a Pro or Business Plan, you get 100 free minutes of video storage and 10,000 minutes of video delivery every month included with your plan. In this example we will name it http-test-server. , go to Settings > Network. Second is if you decide on using Cloudflare then what are the benefits of using a Cloudflare Tunnel over allowing their direct public access to your site. これで自宅内LANとCfの間のVPN（のようなもの）を確立させる。. yourdomain. be xg zn oj rq qf fq zz pd sl