/proc/sys/net/core/ /rmem_default: The default setting of the socket receive buffer in bytes. /rmem_max: The maximum receive socket buffer size in bytes. /wmem_default: The default setting (in bytes) of the socket send buffer. /wmem_max: The maximum send socket buffer size in bytes. Only for Linux - http://www.lainoox.com/view-or-set-socket-receive-buffer-size/