diff --git a/beacon_node/src/cli.rs b/beacon_node/src/cli.rs
index 1339c158258..aa95c3fcae0 100644
--- a/beacon_node/src/cli.rs
+++ b/beacon_node/src/cli.rs
@@ -185,8 +185,7 @@ pub fn cli_app() -> Command {
                 .long("port6")
                 .value_name("PORT")
                 .help("The TCP/UDP ports to listen on over IPv6 when listening over both IPv4 and \
-                      IPv6. Defaults to 9090 when required. The Quic UDP port will be set to this value + 1.")
-                .default_value("9090")
+                      IPv6. Defaults to --port. The Quic UDP port will be set to this value + 1.")
                 .action(ArgAction::Set)
                 .display_order(0)
         )
diff --git a/beacon_node/src/config.rs b/beacon_node/src/config.rs
index 6d3c18d363a..0f8f3a8012a 100644
--- a/beacon_node/src/config.rs
+++ b/beacon_node/src/config.rs
@@ -936,12 +936,11 @@ pub fn parse_listening_addresses(
         .expect("--port has a default value")
         .parse::<u16>()
         .map_err(|parse_error| format!("Failed to parse --port as an integer: {parse_error}"))?;
-    let port6 = cli_args
+    let maybe_port6 = cli_args
         .get_one::<String>("port6")
         .map(|s| str::parse::<u16>(s))
         .transpose()
-        .map_err(|parse_error| format!("Failed to parse --port6 as an integer: {parse_error}"))?
-        .unwrap_or(9090);
+        .map_err(|parse_error| format!("Failed to parse --port6 as an integer: {parse_error}"))?;
 
     // parse the possible discovery ports.
     let maybe_disc_port = cli_args
@@ -989,6 +988,10 @@ pub fn parse_listening_addresses(
                 warn!(log, "When listening only over IPv6, use the --port flag. The value of --port6 will be ignored.");
             }
 
+            // If we are only listening on ipv6 and the user has specified --port6, lets just use
+            // that.
+            let port = maybe_port6.unwrap_or(port);
+
             // use zero ports if required. If not, use the given port.
             let tcp_port = use_zero_ports
                 .then(unused_port::unused_tcp6_port)
@@ -1055,6 +1058,9 @@ pub fn parse_listening_addresses(
             })
         }
         (Some(ipv4), Some(ipv6)) => {
+            // If --port6 is not set, we use --port
+            let port6 = maybe_port6.unwrap_or(port);
+
             let ipv4_tcp_port = use_zero_ports
                 .then(unused_port::unused_tcp4_port)
                 .transpose()?
@@ -1074,7 +1080,7 @@ pub fn parse_listening_addresses(
                     ipv4_tcp_port + 1
                 });
 
-            // Defaults to 9090 when required
+            // Defaults to 9000 when required
             let ipv6_tcp_port = use_zero_ports
                 .then(unused_port::unused_tcp6_port)
                 .transpose()?
diff --git a/book/src/advanced_networking.md b/book/src/advanced_networking.md
index c0f6b5485ef..0dc1000aa04 100644
--- a/book/src/advanced_networking.md
+++ b/book/src/advanced_networking.md
@@ -162,8 +162,8 @@ To listen over both IPv4 and IPv6:
 >
 > **IPv6**:
 >
-> It listens on the default value of --port6 (`9090`) for both UDP and TCP.
-> QUIC will use port `9091` for UDP, which is the default `--port6` value (`9090`) + 1.
+> It listens on the default value of --port6 (`9000`) for both UDP and TCP.
+> QUIC will use port `9001` for UDP, which is the default `--port6` value (`9000`) + 1.
 
 > When using `--listen-address :: --listen-address --port 9909 --discovery-port6 9999`, listening will be set up as follows:
 >
@@ -174,8 +174,8 @@ To listen over both IPv4 and IPv6:
 >
 > **IPv6**:
 >
-> It listens on the default value of `--port6` (`9090`) for TCP, and port `9999` for UDP.
-> QUIC will use port `9091` for UDP, which is the default `--port6` value (`9090`) + 1.
+> It listens on the default value of `--port6` (`9000`) for TCP, and port `9999` for UDP.
+> QUIC will use port `9001` for UDP, which is the default `--port6` value (`9000`) + 1.
 
 ### Configuring Lighthouse to advertise IPv6 reachable addresses
 
diff --git a/book/src/help_bn.md b/book/src/help_bn.md
index 2d12010094c..3bc8a2c2750 100644
--- a/book/src/help_bn.md
+++ b/book/src/help_bn.md
@@ -301,8 +301,8 @@ Options:
           [default: 9000]
       --port6 <PORT>
           The TCP/UDP ports to listen on over IPv6 when listening over both IPv4
-          and IPv6. Defaults to 9090 when required. The Quic UDP port will be
-          set to this value + 1. [default: 9090]
+          and IPv6. Defaults to --port. The Quic UDP port will be set to this
+          value + 1.
       --prepare-payload-lookahead <MILLISECONDS>
           The time before the start of a proposal slot at which payload
           attributes should be sent. Low values are useful for execution nodes