Hola amigos.

Esto es unaseguencia tomada de wireshark

¿Qué puede provocar que una máquina esté preguntando repetidamente Who has por toda la red??

Esta máquina, (la 55) está haciendo esto constantemente

        Broadcast   ARP   60   Who has 10.90.30.20? Tell 10.90.30.55
   Broadcast   ARP   60   Who has 10.90.30.179? Tell 10.90.30.55
   Broadcast   ARP   60   Who has 10.90.30.152? Tell 10.90.30.55
   Broadcast   ARP   60   Who has 10.90.30.78? Tell 10.90.30.55
   Broadcast   ARP   60   Who has 10.90.30.12? Tell 10.90.30.55
   Broadcast   ARP   60   Who has 10.90.30.105? Tell 10.90.30.55
   Broadcast   ARP   60   Who has 10.90.30.201? Tell 10.90.30.55
   Broadcast   ARP   60   Who has 10.90.30.221? Tell 10.90.30.55
   Broadcast   ARP   60   Who has 10.90.30.188? Tell 10.90.30.55
   Broadcast   ARP   60   Who has 10.90.30.11? Tell 10.90.30.55
   Broadcast   ARP   60   Who has 10.90.30.178? Tell 10.90.30.55
   Broadcast   ARP   60   Who has 10.90.30.238? Tell 10.90.30.55
   Broadcast   ARP   60   Who has 10.90.30.222? Tell 10.90.30.55
   Broadcast   ARP   60   Who has 10.90.30.224? Tell 10.90.30.55
   Broadcast   ARP   60   Who has 10.90.30.156? Tell 10.90.30.55
   Broadcast   ARP   60   Who has 10.90.30.243? Tell 10.90.30.55
   Broadcast   ARP   60   Who has 10.90.30.10? Tell 10.90.30.55
   Broadcast   ARP   60   Who has 10.90.30.33? Tell 10.90.30.55
   Broadcast   ARP   60   Who has 10.90.30.46? Tell 10.90.30.55
   Broadcast   ARP   60   Who has 10.90.30.84? Tell 10.90.30.55
   Broadcast   ARP   60   Who has 10.90.30.121? Tell 10.90.30.55
   Broadcast   ARP   60   Who has 10.90.30.63? Tell 10.90.30.55
   Broadcast   ARP   60   Who has 10.90.30.190? Tell 10.90.30.55
   Broadcast   ARP   60   Who has 10.90.30.1? Tell 10.90.30.55
   Broadcast   ARP   60   Who has 10.90.30.194? Tell 10.90.30.55
   Broadcast   ARP   60   Who has 10.90.30.79? Tell 10.90.30.55
   Broadcast   ARP   60   Who has 10.90.30.94? Tell 10.90.30.55
   Broadcast   ARP   60   Who has 10.90.30.77? Tell 10.90.30.55
   Broadcast   ARP   60   Who has 10.90.30.214? Tell 10.90.30.55
   Broadcast   ARP   60   Who has 10.90.30.143? Tell 10.90.30.55
   Broadcast   ARP   60   Who has 10.90.30.4? Tell 10.90.30.55
   Broadcast   ARP   60   Who has 10.90.30.248? Tell 10.90.30.55
   Broadcast   ARP   60   Who has 10.90.30.8? Tell 10.90.30.55
   Broadcast   ARP   60   Who has 10.90.30.65? Tell 10.90.30.55
   Broadcast   ARP   60   Who has 10.90.30.28? Tell 10.90.30.55
   Broadcast   ARP   60   Who has 10.90.30.34? Tell 10.90.30.55
   Broadcast   ARP   60   Who has 10.90.30.166? Tell 10.90.30.55
   Broadcast   ARP   60   Who has 10.90.30.162? Tell 10.90.30.55

Sí Daniel, pero eso no debería hacerlo. Ninguna otra máquina de la red se comporta tal obsesiva. Incluso, no me doy cuenta que las otras computadoras le respondan.
Ahí veo un comportamiento anómalo, pero no sé cuál es la razón.

Gracias por responder

Gracias. El asunto es que he revisado esa máquina y no encuentro qué configuración o programa hace que la computadora se comporte de esa forma, por eso pregunté.
No sé si es un programa mal instalado, un intento de suplantación de ip... No me he dado cuenta de qué programa ha provocado ese comportamiento

Daniel Muchas gracias.