DHCP Server Configuration Problem

[DÔ Phan-Cam-Thach]

Hello all,
i now have a server configuration problem. There is no problem when i try to modify the configuration infos in the file dhcpd.conf for configuring the server. But when i execute the server by the command:
./dhcpd.conf
there is a warning : unable to create icmp socket: operation not permitted
                                    /etc/dhcpd.conf not found
So that i creat un file whose name is dhcpd.conf in /etc
But i can not modify the content of this file, even can not use this command:
cat /dhcp/server/dhcpd.conf  > /etc/dhcpd.conf
I know this question is very simple. But i'm a beginner in Linux. So hope that someone will help me with his answer.
Thanks in advance.


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