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Tag: system administration

DRY DHCP Client: request and IP address to the DHCP server without a DHCP Client

2021/05/27 No hi ha comentaris
Reading time: < 1 minute

When you want to discover LAN metadata without being part of that network. So, when you want to discover network address range, gateway, DNS IPs, DHCP server IPs, etc. this simple nmap parameter will help you so much.

# nmap --script broadcast-dhcp-discover

Starting Nmap 7.60 ( https://nmap.org ) at 2021-05-19 15:07 CEST
Pre-scan script results:
| broadcast-dhcp-discover:
|   Response 1 of 1:
|     IP Offered: 192.168.1.127
|     DHCP Message Type: DHCPOFFER
|     Subnet Mask: 255.255.255.0
|     Renewal Time Value: 4d00h00m00s
|     Rebinding Time Value: 7d00h00m00s
|     IP Address Lease Time: 8d00h00m00s
|     Server Identifier: 192.168.1.1
|     Router: 192.168.1.1
|_    Domain Name Server: 8.8.8.8, 8.8.4.4
WARNING: No targets were specified, so 0 hosts scanned.
Nmap done: 0 IP addresses (0 hosts up) scanned in 1.43 seconds

Having docker in mind

2016/01/02 No hi ha comentaris

Reading time: < 1 minute     Starting new year with innovation ideas in mind 🙂 [gallery size="medium" columns="2" ids="8738,8743,8744,8745"]  

Waiting for IO

2013/02/10 3 comentaris

Reading time: < 1 minute What processes are waiting for IO interrupts: 

while true; do date; ps auxf | awk ‘{if($8==”D”) print $0;}’; sleep 1; done