diff --git a/docs/deploy-to-ubuntu.md b/docs/deploy-to-ubuntu.md
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--- a/docs/deploy-to-ubuntu.md
+++ b/docs/deploy-to-ubuntu.md
@@ -11,7 +11,7 @@ Make sure your target server is running an unmodified copy of the operating syst
 # Road Warrior setup
 
 Some may find it useful to set up an Algo server on an Ubuntu box on your home LAN, with the intention of being able to securely access your LAN and any resources on it when you're traveling elsewhere (the ["road warrior" setup](https://en.wikipedia.org/wiki/Road_warrior_(computing))). A few tips if you're doing so:
-- Make sure you redirect any relevant incoming ports (UDP/500, UDP/4500, and UDP/51820) to the Algo server from your router;
+- Make sure you forward any [relevant incoming ports](/docs/firewalls.md#external-firewall) to the Algo server from your router;
 - Change `BetweenClients_DROP` in `config.cfg` to `false`, and also consider changing `block_smb` and `block_netbios` to `false`;
 - If you want to use a DNS server on your LAN to resolve local domain names properly (e.g. a Pi-hole), set the `dns_encryption` flag in `config.cfg` to `false`, and change `dns_servers` to the local DNS server IP (i.e. `192.168.1.2`).