feat: disable discv4, run discv5 on port 30303 by default#1071
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DISABLE_DISCV4=true appends --disable-discv4-discovery so callers can opt in without changing the entrypoint. V5_DISCOVERY_PORT now defaults to 30303 (same as devp2p TCP) instead of 9200, improving NAT traversal in environments where only standard p2p ports are allowed outbound. Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
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Summary
DISABLE_DISCV4env var (defaultfalse): when set totrue, appends--disable-discv4-discoveryto reth args so callers can opt in without touching the entrypointV5_DISCOVERY_PORTdefault from9200→30303so discv5 runs on the same port as devp2p TCP by defaultMotivation
The Base Sepolia snapshot job (
admin-base-reth-cbnode-sepolia) runs reth in an environment where outbound UDP to non-standard ports is blocked by NAT/firewall. This results inconnected_peers=0throughout the run — reth can't peer, can't snap-sync, FCUs always returnSyncing, and the safe head never advances.discv4 uses a stateless ping/pong UDP handshake that fails through NAT without hole-punching. discv5 uses a session-based protocol with better NAT traversal characteristics. Running discv5 on port 30303 (the standard devp2p port, already allowed outbound) gives the node the best chance of finding peers in restricted network environments.
Existing deployments are unaffected:
DISABLE_DISCV4defaults tofalseandV5_DISCOVERY_PORTis still overridable per-deployment.