How to Set Up a 10 vs 10 Server in Left 4 Dead 2

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A 10-versus-10 Left 4 Dead 2 server needs more than a larger server.cfg. Install the SteamCMD dedicated server (app ID 222860), add MetaMod:Source and SourceMod, use L4DToolZ to raise the server’s client ceiling to at least 20, then use SuperVersus or a maintained equivalent to set ten survivors and ten infected. Finally, force Versus mode, expose the game port, and test the exact plugin builds and network path you will run.

What a 10v10 L4D2 server actually requires

Left 4 Dead 2’s stock Versus configuration is not designed for twenty connected players. A normal server must be expanded in two separate places:

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• Capacity: the server must accept at least 20 clients. L4DToolZ provides the controls commonly exposed as sv_setmax and sv_maxplayers.
• Team limits: a team-management plugin must allow ten survivors and ten infected. SuperVersus documents l4d_survivor_limit and l4d_infected_limit; a maintained fork may use equivalent names.

Both layers are necessary. Raising the client count without changing team limits leaves you with extra connections that cannot join the intended teams. Changing team limits without an extension that raises the server ceiling leaves the game capped at its normal player count.

The practical target is 20 total slots: ten survivor slots plus ten infected slots. A community operator report described 20-player 10v10 as stable in that particular environment, but also said counts above 20 were not time-stable. That is an experience report from 2010, not a Valve guarantee or an independent benchmark.

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Choose a hosting model before installing

You can run the dedicated server on a machine at home or on a rented VPS/managed game host. The software stack is broadly the same, but the operational work is different.

Whichever model you choose, confirm support for a 20-slot L4D2 server and the specific extension builds you intend to use. A host that advertises ordinary L4D2 slots may not permit the extensions required for 10v10.

Install the Left 4 Dead 2 dedicated server with SteamCMD

SteamCMD installs the server files separately from the game client. Download the SteamCMD build for your operating system, and create a server directory outside the SteamCMD installation directory. Keeping the trees separate makes updates and backups easier.

1. Extract SteamCMD and create a destination directory for the server. For a Linux example, use a directory such as /srv/l4d2; on Windows, use a dedicated directory such as C:L4D2Server.
2. Start SteamCMD and point it at the destination with force_install_dir. The path must be writable by the account that will run the server.
3. Log in anonymously with login anonymous.
4. Install and validate the dedicated-server files with app_update 222860 validate. The Steam Community installation guide identifies 222860 as the Left 4 Dead 2 dedicated-server app ID and gives that exact command.
5. Exit SteamCMD with quit, then inspect the destination for the left4dead2 directory before adding extensions.

Run validation again after a damaged or incomplete update. Do not install add-ons inside the SteamCMD program directory; they belong in the installed server’s left4dead2 tree.

Create a clean server.cfg

Create left4dead2/cfg/server.cfg. Put one console variable (cvar) on each line. Values containing spaces must be enclosed in quotation marks. Keep this file limited to settings you understand, and save a backup before changing plugin versions.

sv_setmax 20
sv_maxplayers 20
l4d_survivor_limit 10
l4d_infected_limit 10
mp_gamemode versus

The two capacity cvars are supplied by L4DToolZ, while the team-limit cvars are supplied by SuperVersus or an equivalent maintained team-management plugin. If your chosen fork documents different names, use its names rather than adding duplicate or obsolete cvars. A cvar that is unknown at startup is evidence that the relevant extension or plugin is not loaded, or that the build uses a different interface.

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Set an RCON password only if you need remote console administration. Use a long, unique random value; documentation for Docker-based deployments specifically warns that weak RCON passwords are vulnerable to dictionary attacks. Never publish the password in a server advertisement or commit it to a publicly readable configuration repository.

Install the extension stack in the right order

SourceMod gameplay plugins depend on the loader beneath them. Install in this order:

1. MetaMod:Source: install the loader into the server’s left4dead2 tree and verify that the game can start with it present.
2. SourceMod: install it after MetaMod:Source. SourceMod supplies the plugin and administration framework used by the team-management add-on.
3. L4DToolZ: install the extension that exposes the larger client and player limits.
4. SuperVersus or a maintained equivalent: install the plugin that controls survivor and infected team sizes.

Copy each package’s documented addons and cfg directories into the server’s left4dead2 directory, merging folders rather than nesting an extra copy of left4dead2 inside it. Restart the server after each major installation or after the complete stack is in place.

After the restart, use SourceMod’s plugin-list command, commonly sm plugins list, from the server console or an authorized admin console. Confirm that the team-management plugin reports as loaded and that L4DToolZ’s extension is present. A missing loader, an incorrect folder level or a binary built for a different game update can prevent the dependent plugin from loading.

Raise the server ceiling to 20 clients

Install L4DToolZ before attempting to create ten-player teams. Its documented controls are sv_setmax and sv_maxplayers. Set both to at least 20 for a 10v10 target, either in server.cfg or through the server console after the extension has loaded.

sv_setmax 20
sv_maxplayers 20

The exact behavior can vary with the L4DToolZ build and the game update. If one cvar is accepted but the effective capacity remains lower, check the extension’s startup output and documentation rather than repeatedly changing unrelated game cvars. Restart after changing the maximum so that all plugins see the same client ceiling during initialization.

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Do not set a larger number merely because the plugin accepts it. The only target established for this guide is 20 total players. The 2010 community report that discussed 10v10 did not find counts above 20 time-stable, and there is no independent benchmark or official Valve compatibility table establishing a safe higher limit.

Set ten survivors and ten infected

With the capacity extension loaded, configure the team-management plugin:

l4d_survivor_limit 10
l4d_infected_limit 10

SuperVersus documentation describes a maximum survivor setting of 18 and advertises support up to 18v18, so a setting of ten is within the range it documents. The same description explicitly says that the plugin alone will not allow more than eight players and requires an extension for larger games; that is why L4DToolZ must be installed first.

Some maintained forks rename or reorganize these cvars. Use the equivalent variables documented by the fork you actually install, and do not run two team-management plugins at once. Competing plugins can overwrite limits on map change, create uneven teams or make troubleshooting impossible.

Apply the values before opening a public lobby. Then change maps or restart once, because some plugins apply team limits during map initialization rather than immediately when a cvar is entered.

Force Versus mode instead of relying on the lobby

A server that starts in Campaign or another mode can ignore the assumptions behind your 10v10 configuration. Set the initial mode explicitly:

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• In a native SRCDS launch, add +mp_gamemode versus to the launch command.
• In a Docker deployment that follows the documented image settings, set DEFAULT_MODE=versus.
• If the server should never accept another mode, restrict the allowed game types using the controls supplied by your deployment or server-management layer.

Keep the mp_gamemode versus line in server.cfg as a second layer of protection, but treat the launch setting as the authoritative startup choice for a native server. Confirm the mode after every restart; an image update or launch-script change can silently restore a different default.

Open the network path

For a home server, forward the L4D2 game port from the router to the server’s private address and allow the same traffic through the host firewall. The Steam guide identifies 27015 as the default L4D2 port. Publish both TCP and UDP when using a Docker bridge deployment; its documentation warns that the client-facing and host-facing ports must match.

1. Give the server machine a stable address on your local network, preferably with a DHCP reservation.
2. Forward external port 27015 to internal port 27015 for the server’s address, enabling both TCP and UDP rules.
3. Allow the corresponding inbound traffic in the operating-system firewall.
4. If you changed the game port, use that changed value consistently in the router rule, Docker port publication, firewall rule and connection string.
5. Test from outside your home network. A connection that works only from the same LAN does not prove that internet forwarding is correct.

Do not expose administrative services unnecessarily. The game port is required for players; RCON should be protected by a strong password and limited by firewall policy where your environment allows it.

Make the server discoverable

There are several ways for players to reach a nonstandard 10v10 server:

• Steam Group: associate the server with a group so members can find it through the game’s group-server path.
• In-game browser: search for the server after it has completed startup and registered.
• Best Available Dedicated lobby: from a lobby configured for a dedicated server, use mm_dedicated_force_servers ip:port with the server’s public address and port.
• Direct connection: have a player open the developer console and run connect ip:port.

Use the public address, not the server’s private LAN address, when players are outside your network. If your internet connection uses carrier-grade NAT and does not provide an inbound public address, ordinary router forwarding may not be sufficient; use a hosting environment that supplies a reachable address.

Verify the installation before inviting a full team

Test in stages so a failure points to one layer instead of twenty simultaneous changes.

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1. Loader check: restart and confirm MetaMod:Source and SourceMod initialize without errors.
2. Plugin check: run sm plugins list and confirm the team-management plugin is loaded.
3. Capacity check: verify that L4DToolZ accepts the 20-client settings and does not reset them on map change.
4. Mode check: start a Versus map and confirm the server is not launching Campaign.
5. Team check: connect several test accounts and fill survivor and infected slots gradually. Watch for a hard stop at eight, ten or another unexpected number.
6. Reconnect check: change maps and restart the process, then repeat the capacity and team checks. A setting that works only until the first map change is not a finished setup.
7. External-path check: have someone outside the host’s network join through the public address, then test the same route using the discovery method you plan to advertise.

Record the plugin versions, game update, operating system, map rotation, tick settings, CPU and memory usage and network conditions during the test. These details are essential if a later update changes behavior.

Troubleshoot the common failure modes

The server stops at eight players

This almost always means that the capacity extension is absent, failed to load, or is being started after the team plugin tries to initialize. Check the MetaMod and SourceMod startup output, confirm L4DToolZ is in the correct addons path, and run the plugin-list command after a full restart. Also check that the installed extension build supports your current game update.

The server accepts 20 connections but teams remain smaller

Confirm that SuperVersus or the maintained equivalent is loaded and that its cvars are the ones documented by that build. Set both team limits after the plugin has loaded, then change maps or restart. Remove any second plugin that also manages team size.

The server starts in the wrong game mode

Inspect the native launch arguments, Docker’s DEFAULT_MODE value and server.cfg. Set the mode to Versus in the layer that actually launches your server, restart, and verify again after a map change.

Players cannot connect from the internet

Check that the forwarded port matches the port in the advertised address, that both TCP and UDP are allowed where required, and that the host firewall permits inbound traffic. Test from a different network. A successful LAN connection can coexist with a broken router rule or carrier-grade NAT.

Players see an empty or unreachable server listing

Use a direct connect ip:port test to separate discovery from networking. If direct connection works, correct the Steam Group or browser advertisement and make sure you are publishing the public address. If direct connection fails, return to port forwarding and firewall checks.

The server becomes unstable with a full roster

Do not assume that a plugin’s maximum value is a stability guarantee. Reproduce the issue with the exact map, rotation, tick settings, CPU/RAM allocation and network path you intend to use. Keep the target at 20 while diagnosing; the available community report did not establish time-stable operation above 20.

Operate the server safely after it works

• Back up server.cfg, plugin configuration files and any custom map or rotation files before updates.
• Update the dedicated server with SteamCMD validation, then check extension compatibility before opening the server to players.
• Restart after installing or replacing MetaMod:Source, SourceMod, L4DToolZ or the team plugin; do not assume a live reload applies every setting.
• Keep RCON credentials private and rotate them if they are exposed.
• Use a restart policy or scheduled supervision for unattended servers, while checking that an automatic restart does not repeatedly launch a broken plugin stack.
• Document the exact cvar values and launch arguments so a second administrator can reproduce the setup.

What the documented limits do—and do not—prove

The number 20 is a configuration target derived from ten survivors plus ten infected. It is not an official Valve-supported player-count table. SuperVersus documentation from DDR Khat (2009) describes a survivor-limit maximum of 18 and support advertised up to 18v18, while also requiring an extension beyond eight total players. A 2010 AlliedModders community report described 20-player 10v10 as stable in one operator’s environment and found higher counts not time-stable. Those statements establish what the cited tools and one reported setup claimed, not what every operating system, map, host or plugin combination will sustain.

Plan a private load test before publishing the address. If your results differ from the report, trust the measurements from your own deployment: connection stability, map-change behavior, CPU and memory headroom, tick consistency and latency matter more than an advertised maximum.

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Final launch checklist

• SteamCMD installed the server with app_update 222860 validate.
• left4dead2/cfg/server.cfg exists, uses one cvar per line and quotes values containing spaces.
• MetaMod:Source loads before SourceMod.
• L4DToolZ loads and provides an effective ceiling of at least 20.
• SuperVersus or a maintained equivalent loads and applies ten survivor and ten infected slots.
• Versus is selected at launch and remains active after a map change.
• Port 27015 (or your deliberately chosen alternative) is consistent across the server, Docker publication, firewall, router and connection address.
• At least one external player has joined through the public path.
• RCON, if enabled, uses a strong private password.
• You have tested the exact plugin builds, maps, tick settings, CPU/RAM allocation and network path planned for regular play.

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