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# 19.3. IPv6 security auditing

Currently there are no comfortable tools out which are able to check a system over network for IPv6 security issues. Neither Nessus nor any commercial security scanner is as far as I know able to scan IPv6 addresses.

## 19.3.1. Legal issues

ATTENTION: always take care that you only scan your own systems or after receiving a written order, otherwise legal issues are able to come up to you. CHECK destination IPv6 addresses TWICE before starting a scan.

## 19.3.2. Security auditing using IPv6-enabled netcat

With the IPv6-enabled netcat (see IPv6+Linux-status-apps/security-auditing for more) you can run a portscan by wrapping a script around which run through a port range, grab banners and so on. Usage example:

    # nc6 ::1 daytime
    13 JUL 2002 11:22:22 CEST

## 19.3.3. Security auditing using IPv6-enabled nmap

NMap, one of the best portscaner around the world, supports IPv6 since version 3.10ALPHA1. Usage example:

    # nmap -6 -sT ::1
    Starting nmap V. 3.10ALPHA3 ( www.insecure.org/nmap/ )
    Interesting ports on localhost6 (::1):
    (The 1600 ports scanned but not shown below are in state: closed)
    Port       State       Service
    22/tcp     open        ssh
    53/tcp     open        domain
    515/tcp    open        printer
    2401/tcp   open        cvspserver
    Nmap run completed -- 1 IP address (1 host up) scanned in 0.525 seconds

## 19.3.4. Security auditing using IPv6-enabled strobe

Strobe is a (compared to NMap) more a low budget portscanner, but there is an IPv6-enabling patch available (see IPv6+Linux-status-apps/security-auditing for more). Usage example:

    # ./strobe ::1 strobe 1.05 (c) 1995-1999 Julian Assange <proff@iq.org>.
    ::1 2401 unassigned unknown
    ::1 22 ssh Secure Shell - RSA encrypted rsh
    ::1 515 printer spooler (lpd)
    ::1 6010 unassigned unknown
    ::1 53 domain Domain Name Server

Note: strobe isn't really developed further on, the shown version number isn't the right one.

## 19.3.5. Audit results

If the result of an audit mismatch your IPv6 security policy, use IPv6 firewalling to close the holes, e.g. using netfilter6 (see Firewalling/Netfilter6 for more).

Info: More detailed information concerning IPv6 Security can be found here:

- IETF drafts - IPv6 Operations (v6ops)

- RFC 3964 / Security Considerations for 6to4

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