diff --git a/Cargo.lock b/Cargo.lock
index 7bb666e08..0ee0e35f4 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -538,9 +538,11 @@ version = "0.2.12"
 dependencies = [
  "beacon_node",
  "clap",
- "discv5",
  "eth2_libp2p",
+ "eth2_ssz",
+ "eth2_testnet_config",
  "futures 0.3.5",
+ "hex 0.4.2",
  "log 0.4.11",
  "logging",
  "slog",
@@ -550,6 +552,7 @@ dependencies = [
  "slog-term",
  "sloggers",
  "tokio 0.2.22",
+ "types",
 ]
 
 [[package]]
@@ -1242,9 +1245,9 @@ checksum = "212d0f5754cb6769937f4501cc0e67f4f4483c8d2c3e1e922ee9edbe4ab4c7c0"
 
 [[package]]
 name = "discv5"
-version = "0.1.0-alpha.11"
+version = "0.1.0-alpha.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c68cb1b942aadd3bb3a13620c4d831c0aa49eda988cf8bcccfdfdc7ef69504a7"
+checksum = "65a5e4a22a4c1d7142f54ac068b8c6252610ed0ebf00264f39eccee7f88fe4b9"
 dependencies = [
  "aes-gcm",
  "arrayvec",
diff --git a/beacon_node/eth2_libp2p/Cargo.toml b/beacon_node/eth2_libp2p/Cargo.toml
index 49e6dc92e..2df5123b5 100644
--- a/beacon_node/eth2_libp2p/Cargo.toml
+++ b/beacon_node/eth2_libp2p/Cargo.toml
@@ -32,7 +32,7 @@ snap = "1.0.0"
 void = "1.0.2"
 tokio-io-timeout = "0.4.0"
 tokio-util = { version = "0.3.1", features = ["codec", "compat"] }
-discv5 = { version = "0.1.0-alpha.10", features = ["libp2p"] }
+discv5 = { version = "0.1.0-alpha.12", features = ["libp2p"] }
 tiny-keccak = "2.0.2"
 environment = { path = "../../lighthouse/environment" }
 rand = "0.7.3"
diff --git a/boot_node/Cargo.toml b/boot_node/Cargo.toml
index ea3a2acba..73306261c 100644
--- a/boot_node/Cargo.toml
+++ b/boot_node/Cargo.toml
@@ -8,6 +8,9 @@ edition = "2018"
 beacon_node = { path = "../beacon_node" }
 clap = "2.33.0"
 eth2_libp2p = { path = "../beacon_node/eth2_libp2p" } 
+types = { path = "../consensus/types" } 
+eth2_testnet_config = { path = "../common/eth2_testnet_config" } 
+eth2_ssz = { path = "../consensus/ssz" } 
 slog = "2.5.2"
 sloggers = "1.0.1"
 tokio = "0.2.21"
@@ -18,4 +21,4 @@ slog-async = "2.5.0"
 slog-scope = "4.3.0"
 slog-stdlog = "4.0.0"
 futures = "0.3.5"
-discv5 = "0.1.0-alpha.5"
+hex = "0.4.2"
diff --git a/boot_node/src/config.rs b/boot_node/src/config.rs
index a08aed00c..2a4bba51d 100644
--- a/boot_node/src/config.rs
+++ b/boot_node/src/config.rs
@@ -1,34 +1,81 @@
-use beacon_node::{get_data_dir, set_network_config};
+use beacon_node::{get_data_dir, get_eth2_testnet_config, set_network_config};
 use clap::ArgMatches;
-use discv5::{enr::CombinedKey, Enr};
+use eth2_libp2p::discv5::{enr::CombinedKey, Enr};
 use eth2_libp2p::{
     discovery::{create_enr_builder_from_config, use_or_load_enr},
     load_private_key, CombinedKeyExt, NetworkConfig,
 };
+use eth2_testnet_config::Eth2TestnetConfig;
+use ssz::Encode;
 use std::convert::TryFrom;
+use std::marker::PhantomData;
 use std::net::SocketAddr;
+use types::EthSpec;
 
 /// A set of configuration parameters for the bootnode, established from CLI arguments.
-pub struct BootNodeConfig {
+pub struct BootNodeConfig<T: EthSpec> {
     pub listen_socket: SocketAddr,
     // TODO: Generalise to multiaddr
     pub boot_nodes: Vec<Enr>,
     pub local_enr: Enr,
     pub local_key: CombinedKey,
     pub auto_update: bool,
+    phantom: PhantomData<T>,
 }
 
-impl TryFrom<&ArgMatches<'_>> for BootNodeConfig {
+impl<T: EthSpec> TryFrom<&ArgMatches<'_>> for BootNodeConfig<T> {
     type Error = String;
 
     fn try_from(matches: &ArgMatches<'_>) -> Result<Self, Self::Error> {
         let data_dir = get_data_dir(matches);
 
+        // Try and grab testnet config from input CLI params
+        let eth2_testnet_config: Option<Eth2TestnetConfig<T>> = {
+            if matches.is_present("testnet") {
+                Some(get_eth2_testnet_config(&matches)?)
+            } else {
+                None
+            }
+        };
+
+        // Try and obtain bootnodes
+
+        let boot_nodes = {
+            let mut boot_nodes = Vec::new();
+
+            if let Some(testnet_config) = eth2_testnet_config.as_ref() {
+                if let Some(enr) = &testnet_config.boot_enr {
+                    boot_nodes.extend_from_slice(enr);
+                }
+            }
+
+            if let Some(nodes) = matches.value_of("boot-nodes") {
+                boot_nodes.extend_from_slice(
+                    &nodes
+                        .split(',')
+                        .map(|enr| enr.parse().map_err(|_| format!("Invalid ENR: {}", enr)))
+                        .collect::<Result<Vec<Enr>, _>>()?,
+                );
+            }
+
+            boot_nodes
+        };
+
         let mut network_config = NetworkConfig::default();
 
         let logger = slog_scope::logger();
 
         set_network_config(&mut network_config, matches, &data_dir, &logger, true)?;
+        // default to the standard port
+        if !matches.is_present("enr-udp-port") {
+            network_config.enr_udp_port = Some(
+                matches
+                    .value_of("port")
+                    .expect("Value required")
+                    .parse()
+                    .map_err(|_| "Invalid port number")?,
+            );
+        }
 
         let private_key = load_private_key(&network_config, &logger);
         let local_key = CombinedKey::from_libp2p(&private_key)?;
@@ -39,16 +86,38 @@ impl TryFrom<&ArgMatches<'_>> for BootNodeConfig {
 
         use_or_load_enr(&local_key, &mut local_enr, &network_config, &logger)?;
 
-        let boot_nodes = {
-            if let Some(boot_nodes) = matches.value_of("boot-nodes") {
-                boot_nodes
-                    .split(',')
-                    .map(|enr| enr.parse().map_err(|_| format!("Invalid ENR: {}", enr)))
-                    .collect::<Result<Vec<Enr>, _>>()?
+        // build the enr_fork_id and add it to the local_enr if it exists
+        if let Some(config) = eth2_testnet_config.as_ref() {
+            let spec = config
+                .yaml_config
+                .as_ref()
+                .ok_or_else(|| "The testnet directory must contain a spec config".to_string())?
+                .apply_to_chain_spec::<T>(&T::default_spec())
+                .ok_or_else(|| "The loaded config is not compatible with the current spec")?;
+
+            if let Some(genesis_state) = config.genesis_state.as_ref() {
+                slog::info!(logger, "Genesis state found"; "root" => genesis_state.canonical_root().to_string());
+                let enr_fork = spec.enr_fork_id(
+                    types::Slot::from(0u64),
+                    genesis_state.genesis_validators_root,
+                );
+
+                // add to the local_enr
+                if let Err(e) = local_enr.insert("eth2", enr_fork.as_ssz_bytes(), &local_key) {
+                    slog::warn!(logger, "Could not update eth2 field"; "error" => ?e);
+                }
             } else {
-                Vec::new()
+                slog::warn!(
+                    logger,
+                    "No genesis state provided. No Eth2 field added to the ENR"
+                );
             }
-        };
+        } else {
+            slog::warn!(
+                logger,
+                "No testnet config provided. Not setting an eth2 field"
+            );
+        }
 
         let auto_update = matches.is_present("enable-enr_auto_update");
 
@@ -62,6 +131,7 @@ impl TryFrom<&ArgMatches<'_>> for BootNodeConfig {
             local_enr,
             local_key,
             auto_update,
+            phantom: PhantomData,
         })
     }
 }
diff --git a/boot_node/src/lib.rs b/boot_node/src/lib.rs
index 2a5546663..3b6b6f391 100644
--- a/boot_node/src/lib.rs
+++ b/boot_node/src/lib.rs
@@ -8,6 +8,7 @@ mod config;
 mod server;
 pub use cli::cli_app;
 use config::BootNodeConfig;
+use types::EthSpec;
 
 const LOG_CHANNEL_SIZE: usize = 2048;
 
@@ -45,13 +46,19 @@ pub fn run(matches: &ArgMatches<'_>, debug_level: String) {
     let _scope_guard = slog_scope::set_global_logger(logger);
     let _log_guard = slog_stdlog::init_with_level(debug_level).unwrap();
 
+    let log = slog_scope::logger();
     // Run the main function emitting any errors
-    if let Err(e) = main(matches, slog_scope::logger()) {
+    if let Err(e) = match matches.value_of("spec") {
+        Some("minimal") => main::<types::MinimalEthSpec>(matches, log),
+        Some("mainnet") => main::<types::MainnetEthSpec>(matches, log),
+        Some("interop") => main::<types::InteropEthSpec>(matches, log),
+        spec => unreachable!("Unknown spec configuration: {:?}", spec),
+    } {
         slog::crit!(slog_scope::logger(), "{}", e);
     }
 }
 
-fn main(matches: &ArgMatches<'_>, log: slog::Logger) -> Result<(), String> {
+fn main<T: EthSpec>(matches: &ArgMatches<'_>, log: slog::Logger) -> Result<(), String> {
     // Builds a custom executor for the bootnode
     let mut runtime = tokio::runtime::Builder::new()
         .threaded_scheduler()
@@ -60,7 +67,7 @@ fn main(matches: &ArgMatches<'_>, log: slog::Logger) -> Result<(), String> {
         .map_err(|e| format!("Failed to build runtime: {}", e))?;
 
     // parse the CLI args into a useable config
-    let config = BootNodeConfig::try_from(matches)?;
+    let config: BootNodeConfig<T> = BootNodeConfig::try_from(matches)?;
 
     // Run the boot node
     runtime.block_on(server::run(config, log));
diff --git a/boot_node/src/server.rs b/boot_node/src/server.rs
index 415e44eec..367948a4b 100644
--- a/boot_node/src/server.rs
+++ b/boot_node/src/server.rs
@@ -1,16 +1,25 @@
 //! The main bootnode server execution.
 
 use super::BootNodeConfig;
-use discv5::{Discv5, Discv5ConfigBuilder, Discv5Event};
-use eth2_libp2p::EnrExt;
+use eth2_libp2p::{
+    discv5::{enr::NodeId, Discv5, Discv5ConfigBuilder, Discv5Event},
+    EnrExt, Eth2Enr,
+};
 use futures::prelude::*;
 use slog::info;
+use types::EthSpec;
 
-pub async fn run(config: BootNodeConfig, log: slog::Logger) {
+pub async fn run<T: EthSpec>(config: BootNodeConfig<T>, log: slog::Logger) {
     // Print out useful information about the generated ENR
 
     let enr_socket = config.local_enr.udp_socket().expect("Enr has a UDP socket");
-    info!(log, "Configuration parameters"; "listening_address" => format!("{}:{}", config.listen_socket.ip(), config.listen_socket.port()), "broadcast_address" => format!("{}:{}",enr_socket.ip(), enr_socket.port()));
+    let eth2_field = config
+        .local_enr
+        .eth2()
+        .map(|fork_id| hex::encode(fork_id.fork_digest))
+        .unwrap_or_default();
+
+    info!(log, "Configuration parameters"; "listening_address" => format!("{}:{}", config.listen_socket.ip(), config.listen_socket.port()), "broadcast_address" => format!("{}:{}",enr_socket.ip(), enr_socket.port()), "eth2" => eth2_field);
 
     info!(log, "Identity established"; "peer_id" => config.local_enr.peer_id().to_string(), "node_id" => config.local_enr.node_id().to_string());
 
@@ -51,7 +60,7 @@ pub async fn run(config: BootNodeConfig, log: slog::Logger) {
     // if there are peers in the local routing table, establish a session by running a query
     if !discv5.table_entries_id().is_empty() {
         info!(log, "Executing bootstrap query...");
-        let _ = discv5.find_node(discv5::enr::NodeId::random()).await;
+        let _ = discv5.find_node(NodeId::random()).await;
     }
 
     // respond with metrics every 10 seconds
diff --git a/common/eth2_testnet_config/Cargo.toml b/common/eth2_testnet_config/Cargo.toml
index e8b7bd842..f5351875c 100644
--- a/common/eth2_testnet_config/Cargo.toml
+++ b/common/eth2_testnet_config/Cargo.toml
@@ -19,4 +19,4 @@ serde_yaml = "0.8.11"
 types = { path = "../../consensus/types"}
 enr = { version = "0.1.0", features = ["libsecp256k1", "ed25519"] }
 eth2_ssz = "0.1.2"
-eth2_config = { path = "../eth2_config"}
\ No newline at end of file
+eth2_config = { path = "../eth2_config"}
diff --git a/lighthouse/environment/Cargo.toml b/lighthouse/environment/Cargo.toml
index ec05faaed..ee191f38d 100644
--- a/lighthouse/environment/Cargo.toml
+++ b/lighthouse/environment/Cargo.toml
@@ -21,4 +21,4 @@ slog-json = "2.3.0"
 exit-future = "0.2.0"
 lazy_static = "1.4.0"
 lighthouse_metrics = { path = "../../common/lighthouse_metrics" }
-discv5 = { version = "0.1.0-alpha.10", features = ["libp2p"] }
+discv5 = { version = "0.1.0-alpha.12", features = ["libp2p"] }