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

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