a ping server for linux ,receive ECHO Request package then send ECHO Reply package to remote ping process.
Linux下的ping服务端，接收ping回应请求，然后回复该请求
Usage:
- Server
# echo "1">/proc/sys/net/ipv4/icmp_echo_ignore_all`
# gcc -o ping_server ping_server.c
# ./ping_server
- Client
C:\> ping.exe x.x.x.x
Good Luck