DHCP 서버 구축

설치환경: ubuntu 20.04

# dhcp 설치
apt update
apt upgrade
apt-get install qemu-guest-agent

# dhcp 설정 추가(설정값 가장 하단에 아래값 입력_기존 주석처리 삭제 후 진행해도 됨)
vi /etc/dhcp/dhcpd.conf

subnet 10.10.13.0 netmask 255.255.255.0 {
  range 시작IP 마지막IP;
  option routers 게이트웨이IP;
}

*옵션 값 참고
range ip ip;
option routers ip; 
option subnet-mask 255.255.255.0;
option domain-search "tecmint.lan";
option domain-name-servers ip;

# 네트워크 인터페이스 2개이상 사용중일때에는 dhcp 사용할 인터페이스 지정하기
vi /etc/default/isc-dhcp-server
INTERFACESv4=""
INTERFACESv6=""

# 설정 후 적용 및 확인
systemctl restart isc-dhcp-server
systemctl status isc-dhcp-server
● isc-dhcp-server.service - ISC DHCP IPv4 server
     Loaded: loaded (/lib/systemd/system/isc-dhcp-server.service; enabled; vendor preset: enabled)
     Active: active (running) since Wed 2023-01-11 01:02:56 UTC; 1s ago
       Docs: man:dhcpd(8)
   Main PID: 1224 (dhcpd)
      Tasks: 4 (limit: 9443)
     Memory: 4.7M
     CGroup: /system.slice/isc-dhcp-server.service
             └─1224 dhcpd -user dhcpd -group dhcpd -f -4 -pf /run/dhcp-server/dhcpd.pid -cf /etc/dhcp/dhcpd.conf

Jan 11 01:02:56 -dhcp sh[1224]: PID file: /run/dhcp-server/dhcpd.pid
Jan 11 01:02:56 -dhcp dhcpd[1224]: Wrote 2 leases to leases file.
Jan 11 01:02:56 -dhcp sh[1224]: Wrote 2 leases to leases file.
Jan 11 01:02:56 -dhcp dhcpd[1224]: Listening on LPF/eth0/92:d5:72:c9:07:6c/10.10.13.0/24
Jan 11 01:02:56 -dhcp sh[1224]: Listening on LPF/eth0/92:d5:72:c9:07:6c/10.10.13.0/24
Jan 11 01:02:56 -dhcp sh[1224]: Sending on   LPF/eth0/92:d5:72:c9:07:6c/10.10.13.0/24
Jan 11 01:02:56 -dhcp sh[1224]: Sending on   Socket/fallback/fallback-net
Jan 11 01:02:56 -dhcp dhcpd[1224]: Sending on   LPF/eth0/92:d5:72:c9:07:6c/10.10.13.0/24
Jan 11 01:02:56 -dhcp dhcpd[1224]: Sending on   Socket/fallback/fallback-net
Jan 11 01:02:56 -dhcp dhcpd[1224]: Server starting service.

# dhcp 할당 정보(dhcp 로그 파일)
cat /var/lib/dhcp/dhcpd.leases