LLMNR (Link-Local Multicast Name Resolution)
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TCP/UDP — DNS
Ikhtisar Port
Apa itu Port 5355?
Port 5355 is used by LLMNR (Link-Local Multicast Name Resolution), a Microsoft protocol that allows name resolution for hosts on the same local network segment without a DNS server. LLMNR is a well-known attack vector in Windows environments, as it can be abused for NBNS/LLMNR poisoning attacks to capture NTLMv2 credentials. Security best practices recommend disabling LLMNR on Windows systems.
Pertimbangan Keamanan
Port 5355 (LLMNR (Link-Local Multicast Name Resolution)) diklasifikasikan sebagai risiko tinggi. Port ini adalah target umum untuk pemindaian otomatis dan serangan brute-force. Jika harus diekspos, batasi akses ke alamat IP yang diketahui.
Rekomendasi: Gunakan aturan firewall untuk memasukkan IP tepercaya ke whitelist. Aktifkan pembatasan kecepatan dan deteksi intrusi.