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Re: EXPERT IPv6 network scaning
From: David Fifield <david () bamsoftware com>
Date: Sun, 8 Apr 2012 23:59:39 -0700

On Mon, Apr 09, 2012 at 08:53:36AM +0200, Patrik Karlsson wrote:
Initiating NSE at 20:01
NSOCK (0.0380s) PCAP requested on device 'br0' with berkeley filter
'ip6[40:1] == 58' (promisc=0 snaplen=1500 to_ms=200) (IOD #1)
NSOCK (0.0380s) PCAP created successfully on device 'br0' (pcap_desc=5
bsd_hack=0 to_valid=1 l3_offset=14) (IOD #1)
NSOCK (0.1410s) Pcap read request from IOD #1  EID 13
NSOCK (0.1410s) Callback: READ-PCAP SUCCESS for EID 13
NSE: Error while parsing IPv6 extension headers.
NSOCK (0.1410s) Pcap read request from IOD #1  EID 21
NSOCK (10.1410s) Callback: READ-PCAP TIMEOUT for EID 21
NSE: Finished targets-ipv6-mld.
NSE: Finished targets-ipv6-mld.
Completed NSE at 20:01, 10.10s elapsed
NSOCK (10.1410s) nsi_delete() (IOD #1)
NSE: Script Post-scanning.
NSE: Starting runlevel 1 (of 1) scan.
Read from /home/david/nmap-git: nmap-services.
WARNING: No targets were specified, so 0 hosts scanned.
Nmap done: 0 IP addresses (0 hosts up) scanned in 10.15 seconds
          Raw packets sent: 0 (0B) | Rcvd: 0 (0B)
NSOCK (10.1410s) nsi_delete() (IOD #1)

Here's what tcpdump sees (just one packet):

20:03:31.628811 IP6 fe80::1e6f:65ff:feb6:cad3 > ff02::1: HBH ICMP6,
multicast listener querymax resp delay: 0 addr: ::, length 24
       0x0000:  6000 0000 0020 0001 fe80 0000 0000 0000  `...............
       0x0010:  1e6f 65ff feb6 cad3 ff02 0000 0000 0000  .oe.............
       0x0020:  0000 0000 0000 0001 3a00 0502 0000 0100  ........:.......
       0x0030:  8200 322f 0000 0000 0000 0000 0000 0000  ..2/............
       0x0040:  0000 0000 0000 0000                      ........

The script works great for me, although it finds less hosts than the other
targets-ipv6-multicast scripts do.
Initially I though it could be a Mac OS X thing, but based on then I saw
Dells, and Sonys among the sample Niteesh sent, so it's probably not that.
I just tried to change the first byte in the payload from 00 to something
else and it gave me an additional host.

I'm not sure what's happening for you David? Maybe someone else on the list
could give the script a go and report back?

I don't know what it is either, but the message "NSE: Error while
parsing IPv6 extension headers" looks like a bug.

David Fifield
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