, ( NFS , ) Linux , portmapper .
, , : portmapper DDoS-.
, portmapper .
, portmapper
Linux, RPC (Remote Procedure Call), NFS - , . , portmapper 111 (TCP UDP).
RPC (Remote Procedure Call) - . , ,
RPC
. RPC - rpcinfo
. :
[root@merionet ~]# rpcinfo -p program vers proto port service 100000 4 tcp 111 portmapper 100000 3 tcp 111 portmapper 100000 2 tcp 111 portmapper 100000 4 udp 111 portmapper 100000 3 udp 111 portmapper 100000 2 udp 111 portmapper

portmapper. .
portmapper in CentOS 7
, portmapper rpcbind. , :

[root@merionet ~]# systemctl stop rpcbind Warning: Stopping rpcbind.service, but it can still be activated by: rpcbind.socket [root@merionet ~]# systemctl stop rpcbind.socket
portmapper,
, :
[root@merionet ~]# systemctl disable rpcbind
. , rpc ( )
[root@merionet ~]# rpcinfo -p rpcinfo: can't contact portmapper: RPC: Remote system error - Connection refused
. , .