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Docs / Networking & Firewall / Network Filtering: Anti-Spoofing and Rogue RA Protection

Network Filtering: Anti-Spoofing and Rogue RA Protection

Network Filtering protects VM traffic against MAC/IP spoofing and rogue IPv6 router advertisements - without it, a compromised or misconfigured guest on a shared bridge could impersonate another VPS's address, or advertise itself as an IPv6 router and hijack traffic from other guests on the same network.

Three filter options are available, chosen per-VM or as an install-wide default in Master Settings:

  • Libvirt (built-in) - libvirt's own standard clean-traffic filter. Solid baseline protection with no extra configuration.
  • Native Performance - a lighter-weight profile covering IPv4 and IPv6 MAC/IP spoofing plus rogue router-advertisement/DHCPv6 guard, implemented directly as host-level ebtables/iptables/ip6tables rules rather than libvirt's own filter chain.
  • Custom (JSON) - write your own filter rule set if neither built-in option fits your exact network policy.

Set a default under Master Settings so every new VPS gets sensible protection automatically, and override it per-VM from that VPS's Network tab for any guest that needs a different policy (or none at all).