Re: dhcp script!

[Walt Scrivens <walts () gate net>]

On Sep 8, 2009, at 3:21 PM, David Fifield wrote:

> [SNIP]

> Try with -PN --send-ip. Maybe something is up with ARP ping.
>
> David Fifield
>
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Yes.
Since I'm running on Unix (Mac) it would have defaulted to raw  
ethernet packets.  I presume a Windows host would have worked without  
--send-ip.  I'll check that and report later.

So now, (dumb newbie question) - why is the router not responding to  
the ethernet frame but does respond to the IP packet?    Isn't the  
packet content the same after the headers are stripped off?

I don't have time now, but will run with Wireshark later to see what I  
can learn.

Walt

***************
sh-3.2# nmap -PN --send-ip -d -sU -p67 --script=dhcp-inform 192.168.1.1

Starting Nmap 5.00 ( http://nmap.org ) at 2009-09-08 16:21 EDT
--------------- Timing report ---------------
  hostgroups: min 1, max 100000
  rtt-timeouts: init 1000, min 100, max 10000
  max-scan-delay: TCP 1000, UDP 1000, SCTP 1000
  parallelism: min 0, max 0
  max-retries: 10, host-timeout: 0
  min-rate: 0, max-rate: 0
---------------------------------------------
NSE: Loaded 1 scripts for scanning.
Warning: Unable to open interface vmnet8 -- skipping it.
Warning: Unable to open interface vmnet1 -- skipping it.
mass_rdns: Using DNS server 208.67.222.222
mass_rdns: Using DNS server 208.67.220.220
Initiating Parallel DNS resolution of 1 host. at 16:21
mass_rdns: 0.07s 0/1 [#: 2, OK: 0, NX: 0, DR: 0, SF: 0, TR: 1]
Completed Parallel DNS resolution of 1 host. at 16:21, 0.07s elapsed
DNS resolution of 1 IPs took 0.07s. Mode: Async [#: 2, OK: 0, NX: 1,  
DR: 0, SF: 0, TR: 1, CN: 0]
Initiating UDP Scan at 16:21
Scanning 192.168.1.1 [1 port]
Packet capture filter (device en1): dst host 192.168.1.144 and (icmp  
or ((tcp or udp or sctp) and (src host 192.168.1.1)))
Completed UDP Scan at 16:21, 2.02s elapsed (1 total ports)
Overall sending rates: 0.99 packets / s, 27.77 bytes / s.
NSE: Script scanning 192.168.1.1.
NSE: Starting runlevel 1 scan
Initiating NSE at 16:21
NSE: NSE Script Threads (1) running:
NSE: Starting dhcp-inform against 192.168.1.1:67.
NSE: Finished dhcp-inform against 192.168.1.1:67.
Completed NSE at 16:21, 3.00s elapsed
NSE: Script Scanning completed.
Host 192.168.1.1 is up, received user-set.
Scanned at 2009-09-08 16:21:25 EDT for 5s
Interesting ports on 192.168.1.1:
PORT   STATE         SERVICE REASON
67/udp open|filtered dhcps   no-response
Final times for host: srtt: -1 rttvar: -1  to: 1000000

Read from /usr/local/share/nmap: nmap-services.
Nmap done: 1 IP address (1 host up) scanned in 5.17 seconds
           Raw packets sent: 2 (56B) | Rcvd: 0 (0B)
sh-3.2#

**************************************************

Here it is without the -PN:

**************************************************
sh-3.2# nmap --send-ip -d -sU -p67 --script=dhcp-inform 192.168.1.1

Starting Nmap 5.00 ( http://nmap.org ) at 2009-09-08 16:28 EDT
--------------- Timing report ---------------
  hostgroups: min 1, max 100000
  rtt-timeouts: init 1000, min 100, max 10000
  max-scan-delay: TCP 1000, UDP 1000, SCTP 1000
  parallelism: min 0, max 0
  max-retries: 10, host-timeout: 0
  min-rate: 0, max-rate: 0
---------------------------------------------
NSE: Loaded 1 scripts for scanning.
Warning: Unable to open interface vmnet8 -- skipping it.
Warning: Unable to open interface vmnet1 -- skipping it.
Initiating Ping Scan at 16:28
Scanning 192.168.1.1 [4 ports]
Packet capture filter (device en1): dst host 192.168.1.144 and (icmp  
or ((tcp or udp or sctp) and (src host 192.168.1.1)))
We got a ping packet back from 192.168.1.1: id = 5989 seq = 0 checksum  
= 59546
Completed Ping Scan at 16:28, 0.01s elapsed (1 total hosts)
Overall sending rates: 341.85 packets / s, 12990.34 bytes / s.
mass_rdns: Using DNS server 208.67.222.222
mass_rdns: Using DNS server 208.67.220.220
Initiating Parallel DNS resolution of 1 host. at 16:28
mass_rdns: 0.07s 0/1 [#: 2, OK: 0, NX: 0, DR: 0, SF: 0, TR: 1]
Completed Parallel DNS resolution of 1 host. at 16:28, 0.07s elapsed
DNS resolution of 1 IPs took 0.07s. Mode: Async [#: 2, OK: 0, NX: 1,  
DR: 0, SF: 0, TR: 1, CN: 0]
Initiating UDP Scan at 16:28
Scanning 192.168.1.1 [1 port]
Packet capture filter (device en1): dst host 192.168.1.144 and (icmp  
or ((tcp or udp or sctp) and (src host 192.168.1.1)))
Completed UDP Scan at 16:28, 0.21s elapsed (1 total ports)
Overall sending rates: 9.35 packets / s, 261.82 bytes / s.
NSE: Script scanning 192.168.1.1.
NSE: Starting runlevel 1 scan
Initiating NSE at 16:28
NSE: NSE Script Threads (1) running:
NSE: Starting dhcp-inform against 192.168.1.1:67.
NSE: Finished dhcp-inform against 192.168.1.1:67.
Completed NSE at 16:28, 3.00s elapsed
NSE: Script Scanning completed.
Host 192.168.1.1 is up, received echo-reply (0.0040s latency).
Scanned at 2009-09-08 16:28:07 EDT for 4s
Interesting ports on 192.168.1.1:
PORT   STATE         SERVICE REASON
67/udp open|filtered dhcps   no-response
MAC Address: 00:0F:66:3E:98:EB (Cisco-Linksys)
Final times for host: srtt: 4007 rttvar: 5000  to: 100000

Read from /usr/local/share/nmap: nmap-mac-prefixes nmap-services.
Nmap done: 1 IP address (1 host up) scanned in 3.48 seconds
           Raw packets sent: 6 (208B) | Rcvd: 1 (28B)

********************************************


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