showmount rpc mount export: RPC: Unable to receive; errno = No route to host

tcpdump -nn host x.x.x.x

showmount -e x.x.x.x

http://www.emsperformance.net/2013/06/29/showmount-rpc-mount-export-rpc-unable-to-receive-errno-no-route-to-host/

解决方法：客户端与服务端  service iptables stop