Nmap Development mailing list archives
attn RON re: DHCP script
From: "Mike ." <dmciscobgp () hotmail com>
Date: Tue, 15 Dec 2015 15:05:26 +0000
group/Ron Bowes i tried to locate a direct email for you to no avail. simple question here. when i fire off your DHCP discovery script, i notice it sends not only your legit packet with all the proper params, but before that, it fires off either an empty or MALFORMED payload first. i am guessing this is just to see if you'll get an ICMP unreachable back (test purposes)? 2 questions here: why the need for the extra overhead involving 2 packets? would you not get the same effect with just 1 VALID payload packet being sent? and that would also have me say for part 2, if it is malformed in the beginning, would it not be dropped by said target anyway? examples below and thank you Mike 1st pkt sent=empty/malformed: [Malformed Packet: BOOTP/DHCP] [Expert Info (Error/Malformed): Malformed Packet (Exception occurred)] [Malformed Packet (Exception occurred)] [Severity level: Error] [Group: Malformed] proper one after: Client IP address: 192.168.0.16 (192.168.0.16) Your (client) IP address: 0.0.0.0 (0.0.0.0) Next server IP address: 0.0.0.0 (0.0.0.0) Relay agent IP address: 0.0.0.0 (0.0.0.0) Client MAC address: 00:1c:25:74:ab:e1 (00:1c:25:74:ab:e1) Client hardware address padding: 00000000000000000000 Server host name not given Boot file name not given Magic cookie: DHCP Option: (53) DHCP Message Type (Inform) Length: 1 DHCP: Inform (8) Option: (55) Parameter Request List Length: 61 Parameter Request List Item: (1) Subnet Mask Parameter Request List Item: (2) Time Offset .........................(snipped) and the cmd i am using : nmap -v -n -Pn -reason -T4 -p 67 -sU max-retries 1 -script=dhcp-discover 192.168.0.10
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Current thread:
- attn RON re: DHCP script Mike . (Dec 15)
- Re: attn RON re: DHCP script Daniel Miller (Dec 15)
- Message not available
- Re: attn RON re: DHCP script Daniel Miller (Dec 15)
- Message not available
- Re: attn RON re: DHCP script Daniel Miller (Dec 15)