Checks und Logs eines DHCP Servers
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Ist der port geöffnet?
- netstat -lnup| grep 67
udp 0 0 0.0.0.0:67 0.0.0.0:* 2333/dhcpd
Status des dhcp Servers
- systemctl status isc-dhcp-server.service
● isc-dhcp-server.service - LSB: DHCP server
Loaded: loaded (/etc/init.d/isc-dhcp-server; generated)
Active: active (running) since Wed 2023-02-15 12:57:54 CET; 47min ago
Docs: man:systemd-sysv-generator(8)
Process: 2318 ExecStart=/etc/init.d/isc-dhcp-server start (code=exited, status=0/SUCCESS)
Tasks: 4 (limit: 2337)
Memory: 4.4M
CPU: 44ms
CGroup: /system.slice/isc-dhcp-server.service
└─2333 /usr/sbin/dhcpd -4 -q -cf /etc/dhcp/dhcpd.conf enp0s3
Feb 15 13:39:45 server1.it19.int dhcpd[2333]: DHCPREQUEST for 172.17.19.55 from 08:00:27:09:03:9a (debian-gnome) via enp0s3
Feb 15 13:39:45 server1.it19.int dhcpd[2333]: DHCPACK on 172.17.19.55 to 08:00:27:09:03:9a (debian-gnome) via enp0s3
Feb 15 13:44:33 server1.it19.int dhcpd[2333]: DHCPREQUEST for 172.16.19.55 from 08:00:27:09:03:9a (debian-gnome) via enp0s3
Feb 15 13:44:33 server1.it19.int dhcpd[2333]: DHCPACK on 172.16.19.55 to 08:00:27:09:03:9a (debian-gnome) via enp0s3
Feb 15 13:44:33 server1.it19.int dhcpd[2333]: DHCPREQUEST for 172.16.19.55 from 08:00:27:09:03:9a (debian-gnome) via 172.17.19.1: ignored (not authoritative).
Feb 15 13:44:33 server1.it19.int dhcpd[2333]: reuse_lease: lease age 0 (secs) under 25% threshold, reply with unaltered, existing lease for 172.16.19.55
Feb 15 13:44:33 server1.it19.int dhcpd[2333]: DHCPREQUEST for 172.16.19.55 from 08:00:27:09:03:9a (debian-gnome) via 172.16.19.1
Feb 15 13:44:33 server1.it19.int dhcpd[2333]: DHCPACK on 172.16.19.55 to 08:00:27:09:03:9a (debian-gnome) via 172.16.19.1
Feb 15 13:44:45 server1.it19.int dhcpd[2333]: DHCPREQUEST for 172.17.19.55 from 08:00:27:09:03:9a (debian-gnome) via enp0s3
Feb 15 13:44:45 server1.it19.int dhcpd[2333]: DHCPACK on 172.17.19.55 to 08:00:27:09:03:9a (debian-gnome) via enp0s3
Logs
- tail -f /var/log/syslog | grep dhcp
- journalctl -fu isc-dhcp-server